电泳烘房燃烧器控制器

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电泳烘房燃烧器控制器

6 Edition 11.08lIndustrial & Commercial ThermalTechnical Information · GB• For modulating, forced draught burners for gas of unlimited capacity in intermittent or continuous operation• Control of fan and butterfly valve• Simple system set-up thanks to optional tightness control and integrated ignition unit• Easy start-up and maintenance thanks to Manual operating mode• Optionally available with integral field bus interface for simple wiring• EC type-tested and certified, CSA and FM app... [收起]
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电泳烘房燃烧器控制器
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第1页

6 Edition 11.08l

Industrial & Commercial Thermal

Technical Information · GB

• For modulating, forced draught burners for gas of unlimited

capacity in intermittent or continuous operation

• Control of fan and butterfly valve

• Simple system set-up thanks to optional tightness control and

integrated ignition unit

• Easy start-up and maintenance thanks to Manual operating mode

• Optionally available with integral field bus interface for simple

wiring

• EC type-tested and certified,

CSA and FM approved

Burner control unit BCU 370

第2页

BCU 370 · Edition 11.08l ▼ = To be continued 2

Table of contents

Burner control unit BCU 370 . . . . . . . . . . . . . . . . . . . . . . . . 1

Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1 Example applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.1.1 Modulating-controlled forced draught burner . . . . . . . 6

1.1.2 Modulating-controlled forced draught burner with

tightness control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.1.3 Modulating-controlled forced draught burner with

pilot burner and tightness control . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1.4 Controlling the BCU via

PROFIBUS-DP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.1.5 Controlling the BCU and the butterfly valve via

PROFIBUS-DP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1 PROFIBUS User Organisation . . . . . . . . . . . . . . . . . . . . . 9

3 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 Connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1.1 BCU 370 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1.2 BCU 370 with actuator IC 20 . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1.3 Capacity control by adjusting the valve between

the Open position and a separate Low position . . . . . . . . . . . 15

3.1.4 BCU 370..B1 with PROFIBUS-DP . . . . . . . . . . . . . . . . . . . 16

3.2 BCU 370 program sequence . . . . . . . . . . . . . . . . . . . . . . 17

3.2.1 Normal start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.2.2 Quick start, butterfly valve waits in the Ignition

position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.2.3 Quick start, butterfly valve waits in the Closed

position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.2.4 Start-up without pre-purge, butterfly valve waits

in the Closed position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.2.5 Controlled air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.3 Tightness control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.3.1 Program sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.4 PROFIBUS-DP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.4.1 Configuration, Master-Slave procedure . . . . . . . . . . . . . 30

3.4.2 Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.4.3 Network technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.4.4 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.4.5 Bus communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.5 Program status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.6 Fault message (blinking) . . . . . . . . . . . . . . . . . . . . . . . . . 35

3.6.1 Reaction to process faults . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4.1 Scanning the parameters . . . . . . . . . . . . . . . . . . . . . . . . 40

4.2 Flame control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.2.1 Burner flame signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.2.2 Burner switch-off threshold . . . . . . . . . . . . . . . . . . . . . . . . 40

4.2.3 UVS check (1× in 24 hours) . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.3 Behaviour during start-up . . . . . . . . . . . . . . . . . . . . . . . . 41

4.3.1 Minimum burner pause time tBP . . . . . . . . . . . . . . . . . . . . 41

4.3.2 Burner start-up attempts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

4.3.3 Switch-on delay time tE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.3.4 Pre-ignition time tVZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.3.5 1st safety time on start-up, burner/pilot burner

tSA1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

4.3.6 1st flame proving period, burner/pilot burner tFS1 . . 43

4.3.7 2nd safety time on start-up, main burner tSA2 . . . . . . . 44

4.3.8 2nd flame proving period, main burner tFS2 . . . . . . . . . 44

4.4 Behaviour during operation . . . . . . . . . . . . . . . . . . . . . . 45

4.4.1 Minimum combustion time tB . . . . . . . . . . . . . . . . . . . . . . . 45

4.4.2 Controller enable signal delay time tRF . . . . . . . . . . . . . . 45

4.4.3 Safety time during operation tSB . . . . . . . . . . . . . . . . . . . . 46

4.4.4 Behaviour in the event of flame failure during

operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.4.5 Last fault signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

4.4.6 V2 during burner operation . . . . . . . . . . . . . . . . . . . . . . . . . . 47

4.5 Monitoring/tightness control . . . . . . . . . . . . . . . . . . . . 48

4.5.1 Min. gas pressure monitoring . . . . . . . . . . . . . . . . . . . . . . . . 48

4.5.2 Digital input function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

4.5.3 Air monitoring during pre-purge . . . . . . . . . . . . . . . . . . . . . 49

4.5.4 Air monitoring during operation . . . . . . . . . . . . . . . . . . . . . 50

4.5.5 Tightness test period tP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

4.5.6 Calculation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

第3页

BCU 370 · Edition 11.08l ▼ = To be continued 3

4.6 Air control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

4.6.1 Valve control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

4.6.2 Pre-purge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

4.6.3 Quick start starts in ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

4.6.4 Pre-purge time tPV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

4.6.5 Post-purge time tPN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

4.6.6 Fan run up time tGV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

4.7 Control using PROFIBUS-DP . . . . . . . . . . . . . . . . . . . . 58

4.7.1 Bus control activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4.7.2 Bus control limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4.8 Manual mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

4.8.1 Operating time in manual mode . . . . . . . . . . . . . . . . . . . . . 60

4.9 Fault messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4.9.1 The last 10 fault messages . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4.10 Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4.10.1 User-defined password . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

5 Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.1 Type code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

6 Project planning information . . . . . . . . . . . . . . . . . . . . 63

6.1 Cable selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

6.1.1 Ionisation cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

6.1.2 UV cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

6.1.3 Ignition cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

6.2 Fan control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

6.3 Controlling the butterfly valve . . . . . . . . . . . . . . . . . . . 64

6.4 Safety interlock (Limits) . . . . . . . . . . . . . . . . . . . . . . . . . . 64

6.5 Too many remote resets . . . . . . . . . . . . . . . . . . . . . . . . . . 64

6.6 Protecting the ignition unit from overload . . . . . . . 64

6.7 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6.7.1 Single-electrode operation with external ignition

unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6.8 BCU switched off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6.9 Note on EC or CSA and FM type-examination . . . 65

6.10 Contact protection devices . . . . . . . . . . . . . . . . . . . . . 65

6.11 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6.12 Protective circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

7 Flame control ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

7.1 ... with ionisation sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

7.2 ... with UV sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

8 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

8.1 High-voltage cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

8.2 BCSoft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

8.3 Radio interference suppressed electrode

adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

8.4 Connection kit BCU 370 . . . . . . . . . . . . . . . . . . . . . . . . . 68

8.5 Set of stickers BCU 370 . . . . . . . . . . . . . . . . . . . . . . . . . . 68

8.6 Device master data file for BCU 370..B1 . . . . . . . . . 68

9 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

9.1 PROFIBUS-DP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

9.2 Operating controls and dimensions . . . . . . . . . . . . . . 71

10 Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

11 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

11.1 Safety shut-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

11.2 Fault lock-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

11.3 Warning signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

11.4 Timeout 25 s/250 s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

12 Annex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

12.1 Status and fault messages for PROFIBUS-DP . 74

Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

第4页

BCU 370 · Edition 11.08l 4

BCU 370

Application

1 Application

The BCU 370 burner control unit controls, ignites and

monitors industrial forced draught burners of unlimited

capacity in intermittent or continuous operation.

It can be used for directly ignited forced draught burners or forced draught burners ignited with pilot burner.

The BCU 370 activates the fan and sets the connected

butterfly valve to Pre-purge and Ignition position. After

pre-purge and burner start, the Enable signal is issued

to an external controller which positions the butterfly

valve in accordance with the output demand. Postpurge occurs after the end of burner operation. The

burner control unit BCU 370 monitors the gas and air

pressure. An optionally integrated tightness control

function checks the valves with an external gas pressure switch.

Programmability by means of the optical interface and

BCSoft PC software guarantees optimum adaptation to

the relevant application. Adjustable start-up attempts

and automatic restart which can be activated ensure

the high flexibility of the burner equipment.

The quick-start option allows standard-compliant startup of the forced draught burner without pre-purge after

normal shut-down. This avoids unnecessary admission

of air into the combustion chamber. The heat output

is available as quickly as possible after a temperature

demand.

Lower section Upper section

第5页

BCU 370 · Edition 11.08l 5

Application

The program status, the unit parameters and the level

of the flame signal can be read directly from the BCU.

An integrated Manual mode allows manual start of the

burner and setting of the butterfly valve position independently of the central control system. The BCSoft

operator-control and setting software provides a powerful tool for start-up and servicing.

To reduce the installation and wiring costs Kromschröder offers an optional Profibus-DP interface to

transfer the activation signals and feedbacks.

第6页

BCU 370 · Edition 11.08l 6

VG

IC 20

B VA

GIK

L1

V1

4

DG min

9 3

VG..L

V2

5 29 3 30 1 32

23

21

24

13 17

18

19

20

26

28

BCU 370..I1 25

DL

DL

7

DG

M

22

UVS

90°

➔ 0

0 ➔ 90°

VG

IC 20

B VA

GIK

L1

V1

4

DG min

9 3

VG..L

V2

5 32

23

21

24

13 17

18

19

20

BCU 370..I1..D3 25

DL

DL

7

DG

M

22

DG

11

DG

pe/2 UVS

29 30 31

26

28

90°

➔ 0

0 ➔ 90°

Application

1.1 Example applications

1.1.1 Modulating-controlled

forced draught burner

The BCU 370 controls the fan and

moves the butterfly valve to prepurge and ignition position. It issues

the Enable signal to the control system after start-up of the burner.

1.1.2 Modulating-controlled

forced draught burner with

tightness control

In addition to controlling the forced

draught burner, the burner control

unit also monitors the fail-safe

function of the two solenoid valves

for gas via the gas pressure switch

DG which is set to pe/2.

Parameter 27 = 1: V2 is “ON” during

burner operation.

第7页

BCU 370 · Edition 11.08l 7

VG

VG

IC 20

B VA

GIK

L1

V1 V2

4 5

DG min

9 3

VG..L

V3

6 32

23

21

24

13 17

18

19

20

BCU 370..D3 25

DL

DL

7

DG

M

22

DG

11

DG

pe/2

UVS

29 30 31

26

28

90°

➔ 0

0 ➔ 90°

Application

1.1.3 Modulating-controlled

forced draught burner with pilot

burner and tightness control

A pilot burner ignites the main burner and is switched off during the

main burner’s safety time.

Parameter 27 = 0: V2 is “OFF”, i.e. interrupted pilot burner, during burner

operation.

第8页

BCU 370 · Edition 11.08l 8 BUS

L1,

L1, 26

28

25

BCU 370..B1

M

ϑ

ϑ

Profibus-DP

29 30 31 32 90°

➔ 0

0 ➔ 90°

3PS

BUS

L1,

L1,

BCU 370..B1-3

M

ϑ

ϑ

Profibus-DP

90°

➔ 0

0 ➔ 90°

3PS

29 30 31 32

Application

1.1.4 Controlling the BCU via

PROFIBUS-DP

The BCU 370..B1 issues the Enable

signal to the temperature controller

for capacity control. The temperature controller then controls the

butterfly valve directly.

1.1.5 Controlling the BCU and the

butterfly valve via PROFIBUS-DP

The BCU 370..B1-3 receives positioning information for the butterfly

valve from the temperature controller via the PROFIBUS-DP and activates the butterfly valve following

controller enable.

Temperature

controller

Temperature

controller

PLC

PLC

第9页

BCU 370 · Edition 11.08l 9

Certification

2 Certification

EC type-tested and certified

pursuant to

– Gas Appliances Directive (90/396/EEC) in conjunction with EN 298,

– Low Voltage Directive (73/23/EEC) in conjunction

with the relevant standards,

– Electromagnetic compatibility 89/336/EEC in conjunction with the relevant standards relating to radiation.

AGA

Approval No. 6478 in preparation

CSA and FM approved

Canadian Standards Association Class: 3335-01 and

3335-81 Systems (Gas-)Automatic Ignition and Components

Factory Mutual Research Class: 7611 Combustion

Safeguards and Flame Sensing System

Suitable for applications pursuant to NFPA 85 and

NFPA 86

2.1 PROFIBUS User Organisation

BCU 370..B1

PUO = PROFIBUS User Organisation

Complies with the requirements of EN 50170-2

第10页

BCU 370 · Edition 11.08l 10

PE

r1 s

r

BCU 370..I1

V1

F1

F3

230V~

l v1 v2

s1

v3 c c

max. 1 A,

253 V max. 1 A,

253 V

V1 C S1 S L A Z M V2 V3 R

C

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

L1 (L1)

N (L2)

PE N

V2

V3

DL DG

min

DG

max

M

3PS

ϑ

p p p I Z

90°

➔ 0

0 ➔ 90°

Function

3 Function

3.1 Connection diagrams

3.1.1 BCU 370

The drawing shows the BCU 370..I1 with integrated

ignition unit, ionisation control and double-electrode

operation.

For cable selection and wiring, see Project planning information.

For the explanation of symbols, see Legend.

第11页

BCU 370 · Edition 11.08l 11

13 14 15 16 PE

3

2

1 UVS

BCU 370..I2 13 14 15 16 PE N

Z Z

3

2

1 UVS

BCU 370..I3 13 14 15 16 PE N

Z Z

3

2

1 UVS

Function

BCU 370..I1 for 120 V and 230 V, UV control

BCU 370..I2 for 230 V, ignition by electrode to electrode

BCU 370..I3 for 120 V, ignition by electrode to electrode

with centre tap for secondary earthing

第12页

BCU 370 · Edition 11.08l 12

BCU 370 13 14 15 16 PE N

BCU 370..D3 11 12

DG

p pe

2

BCU 370 13 14 15 16 PE N

I Z

Function

BCU 370 with single-electrode operation, which requires an external ignition transformer TZI or TGI.

BCU 370..D3, gas pressure switch DG for tightness

control

BCU 370 with external ignition transformer, e.g. TZI or

TGI.

第13页

BCU 370 · Edition 11.08l 13

BCU 370..U1 13 14 15 16 PE 13

24 V

0 V

1

2

3

4

5

6

UVD 1 24 V

0 V

1

2

3

4

5

6

UVD 1

– +

0–20 mA

Function

BCU 370..U1 with UV sensor UVD 1 for continuous operation

Connection of the 24 V DC power supply with separate

wiring in the lower section of the BCU.

The 0 – 20 mA current output is not required for normal operation. If it is used for the display in a control

room for example, then the cable must be connected

in the lower section of the BCU, so that the 0 – 20 mA

signal can be routed via a screened cable. Length of

the unscreened cable from the UV sensor to the BCU:

max. 5 m.

第14页

BCU 370 · Edition 11.08l 14

PE

BCU 370

25 26 27 28 29 30 31 32

L1 (L1)

N (L2)

3PS

16 15 13 12 11 8 7 4 6 3 2 1

S3 S4

S11 S10

0

90°

M

IC 20

PE

S2 S1

r

90°

➔ 0

0 ➔ 90°

90°

➔ 0

0 ➔ 90°

Function

3.1.2 BCU 370 with actuator IC 20

The “closed contact” (90° ➔ 0) of the external threepoint step controller (3PS) can be connected to terminal 26 or 27.

Terminal 26: The controller operates between the Open

and Ignition positions.

Terminal 27: The controller operates between the Open

and Closed positions.

第15页

BCU 370 · Edition 11.08l 15

r

25 26 27 28 29 30 31 32

M

3PS

90°

➔ 0

0 ➔ 90°

Min

+ –

Function

3.1.3 Capacity control by adjusting the valve

between the Open position and a separate Low

position

This connection is used if the valve position to be approached is below the Ignition position.

Standard wiring of BCU 370 and BCU 370..B1 without

three-point step control function

Valve position Activation of terminal

Upper end position Open 28

Lower end position Closed 27

Lower end position Low Via separate limit switch

Lower end position Ignition 26

第16页

BCU 370 · Edition 11.08l 16

PE

r

BCU 370..I1..B1

V1

F1

F3

230V~

l v1 v2

s1

v3 c c

V1 C S1 S L A Z M V2 V3 R

C

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 24 25 26 27 28 29 30 31 32

L1 (L1)

N (L2)

PE N

V2

V3

DL DG

min

DG

max

M

3PS

p p p I Z

BCU 370..B1

PROFIBUS-DP

2B 2A 1B 1A

OFF

ON

90°

➔ 0

0 ➔ 90°

Function

3.1.4 BCU 370..B1 with PROFIBUS-DP

Function see “PROFIBUS-DP”

For cable selection and wiring, see Project planning information.

For the explanation of symbols, see Legend.

第17页

BCU 370 · Edition 11.08l 17

Function

3.2.1 Normal start-up

If a fault from the preceding operating cycle is still being signalled after

switching on, it will be necessary

to reset this first. Once the startup signal (ϑ) has been applied, the

switch-on delay tE starts to elapse.

During the fan run up time tGV

which follows, the fan starts with

the butterfly valve being closed. The

butterfly valve then moves from the

Closed to the Open position. After

pre-purge, it moves back to the Ignition position.

The running times depend on the

respective actuator. The BCU waits

for actuator feedback before continuing the program sequence.

Now the BCU activates pre-ignition

tVZ and then opens valves V1 and

V2 for the pilot burner. The ignition

time tZ is constant. After the flame

proving period for the pilot burner

tFS1, valve V3 opens to ignite the

main burner.

H0

04

05

06

07

08

00

00

H0

01

A1

A0

P1

A2

03

H8

08

P9

Switch on BCU 370

Start-up with ϑ signal

In the event of fault signal: Reset

Fan run up time tGV (P20)

Switch-on delay time tE running (P22)

Start-up position/standby

Start-up position/standby

Normal shut-down

via ϑ signal

Flame proving period tFS1

running for burner/pilot burner (P13)

Safety time tSA1 running for

burner/pilot burner (P12),

V1 and V2 open

Butterfly valve moves to Open position

Butterfly valve moves to Closed position

Pre-purge time tPV running (P18)

Flame proving period tFS2

running for main burner (P15)

Safety time tSA2 running for main burner (P14),

V3 opens

Butterfly valve moves to Ignition position

Pre-ignition time tVZ running (P21)

Ignition activated

Controller enabler signal delay time tRF (P29)

Controller enable signal

Post-purge time tPN running (P19)

If parameter P27 = 0:

V2 is switched off

3.2 BCU 370 program sequence

第18页

BCU 370 · Edition 11.08l 18

Function

If parameter 27 = 0, V2 closes at the

end of the main burner safety time

tSA2. The pilot burner is switched off.

Then the flame proving period for

the main burner tFS2 and the controller enable signal delay time tRF

start to elapse. Afterwards, the BCU

issues the Enable signal to the controller.

If there is no pilot burner, program

steps 06 and 07 will be omitted.

As soon as the start-up signal (ϑ) is

switched off, post-purge starts. The

butterfly valve moves to the Ignition position during this time, then

to the Closed position. Next the

BCU rests in the start-up position/

standby.

H0

04

05

06

07

08

00

00

H0

01

A1

A0

P1

A2

03

H8

08

P9

Switch on BCU 370

Start-up with ϑ signal

In the event of fault signal: Reset

Fan run up time tGV (P20)

Switch-on delay time tE running (P22)

Start-up position/standby

Start-up position/standby

Normal shut-down

via ϑ signal

Flame proving period tFS1

running for burner/pilot burner (P13)

Safety time tSA1 running for

burner/pilot burner (P12),

V1 and V2 open

Butterfly valve moves to Open position

Butterfly valve moves to Closed position

Pre-purge time tPV running (P18)

Flame proving period tFS2

running for main burner (P15)

Safety time tSA2 running for main burner (P14),

V3 opens

Butterfly valve moves to Ignition position

Pre-ignition time tVZ running (P21)

Ignition activated

Controller enabler signal delay time tRF (P29)

Controller enable signal

Post-purge time tPN running (P19)

If parameter P27 = 0:

V2 is switched off

第19页

BCU 370 · Edition 11.08l 19

Function

3.2.2 Quick start, butterfly valve

waits in the Ignition position

Parameter 06 = 0, parameter 28 = 0

Quick start is the same as normal

start, except that pre-purge is

dispensed with. The burner starts

quicker. This results in improved

control quality, since there is no

dead time, the energy is used better

and no cold air is fed to the combustion chamber.

The BCU 370 only carries out a

quick start if the last shut-down was

a normal shut-down. No more than

24 hours may have elapsed and the

BCU must have been switched on.

In contrast to the “normal start-up”,

in the case of a quick start, program

steps A1, P1 and A2 .will be omitted.

If there is no pilot burner, program

steps 06 und 07 will also be omitted.

H0

05

06

07

08

00

00

H0

02

01

H8

08

P9

A1

A2

04

03

Start-up with ϑ signal

Waiting time tW

Fan run up time tGV (P20)

Switch-on delay time tE running (P22)

Start-up position/standby

Start-up position/standby

Normal shut-down

via ϑ signal

Flame proving period tFS1

running for burner/pilot burner (P13)

Flame proving period tFS2

running for main burner (P15)

Safety time tSA2 running for main burner (P14),

V3 opens

Controller enabler signal delay time tRF (P29)

Controller enable signal

Post-purge time tPN running (P19)

If parameter P27 = 0:

V2 is switched off

Butterfly valve moves to Open position

Butterfly valve moves to Ignition position

Safety time tSA1 running for

burner/pilot burner (P12),

V1 and V2 open

Pre-ignition time tVZ running (P21)

Ignition activated

第20页

BCU 370 · Edition 11.08l 20

Function

After normal shut-down, the postpurge time tPN starts to elapse and

then the butterfly valve moves to

the Ignition position in preparation

for the next start.

NOTE: Quick Start is not allowed for

units with FM or CSA approval.

H0

05

06

07

08

00

00

H0

02

01

H8

08

P9

A1

A2

04

03

Start-up with ϑ signal

Waiting time tW

Fan run up time tGV (P20)

Switch-on delay time tE running (P22)

Start-up position/standby

Start-up position/standby

Normal shut-down

via ϑ signal

Flame proving period tFS1

running for burner/pilot burner (P13)

Flame proving period tFS2

running for main burner (P15)

Safety time tSA2 running for main burner (P14),

V3 opens

Controller enabler signal delay time tRF (P29)

Controller enable signal

Post-purge time tPN running (P19)

If parameter P27 = 0:

V2 is switched off

Butterfly valve moves to Open position

Butterfly valve moves to Ignition position

Safety time tSA1 running for

burner/pilot burner (P12),

V1 and V2 open

Pre-ignition time tVZ running (P21)

Ignition activated

第21页

BCU 370 · Edition 11.08l 21

Function

3.2.3 Quick start, butterfly valve

waits in the Closed position

Parameter 06 = 0, parameter 28 = 1

Pre-purge will also be omitted for

this type of quick start. To prevent

cold air from entering the combustion chamber while the BCU is in

start-up position/standby, the butterfly valve waits in the Closed position.

The BCU 370 only carries out a

quick start if the last shut-down was

a normal shut-down. No more than

24 hours may have elapsed and the

BCU must have been switched on.

After the switch-on delay time tE,

the butterfly valve moves to the Ignition position. The Ignition position

is always approached from the top.

Therefore, the butterfly valve moves

to the Open position first.

H0

05

06

07

08

00

00

H0

01

A1

A0

A2

H8

08

P9

04

03

02

Start-up with ϑ signal

Fan run up time tGV (P20)

Waiting time tW

Switch-on delay time tE running (P22)

Start-up position/standby

Start-up position/standby

Normal shut-down

via ϑ signal

Flame proving period tFS1

running for burner/pilot burner (P13)

Butterfly valve moves to Open position

Butterfly valve moves to Closed position

Flame proving period tFS2

running for main burner (P15)

Safety time tSA2 running for main burner (P14),

V3 opens

Butterfly valve moves to Ignition position

Controller enabler signal delay time tRF (P29)

Controller enable signal

Post-purge time tPN running (P19)

If parameter P27 = 0:

V2 is switched off

Safety time tSA1 running

for burner/pilot burner (P12),

V1 and V2 open

Pre-ignition time tVZ running (P21)

Ignition activated

第22页

BCU 370 · Edition 11.08l 22

Function

If there is no pilot burner, program

steps 06 and 07 will be omitted.

As soon as the start-up signal (ϑ) is

switched off, post-purge starts. The

butterfly valve moves to the Ignition position during this time, then

to the Closed position. Next the

BCU rests in the start-up position/

standby.

NOTE: Quick Start is not allowed for

units with FM or CSA approval.

H0

05

06

07

08

00

00

H0

01

A1

A0

A2

H8

08

P9

04

03

02

Start-up with ϑ signal

Fan run up time tGV (P20)

Waiting time tW

Switch-on delay time tE running (P22)

Start-up position/standby

Start-up position/standby

Normal shut-down

via ϑ signal

Flame proving period tFS1

running for burner/pilot burner (P13)

Butterfly valve moves to Open position

Butterfly valve moves to Closed position

Flame proving period tFS2

running for main burner (P15)

Safety time tSA2 running for main burner (P14),

V3 opens

Butterfly valve moves to Ignition position

Controller enabler signal delay time tRF (P29)

Controller enable signal

Post-purge time tPN running (P19)

If parameter P27 = 0:

V2 is switched off

Safety time tSA1 running

for burner/pilot burner (P12),

V1 and V2 open

Pre-ignition time tVZ running (P21)

Ignition activated

第23页

BCU 370 · Edition 11.08l 23

Function

3.2.4 Start-up without pre-purge,

butterfly valve waits in the Closed

position

Parameter 18 = 0, parameter 28 = 1

If a fault from the preceding operating cycle is still being signalled after

switching on, it will be necessary

to reset this first. Once the startup signal (ϑ) has been applied, the

switch-on delay tE starts to elapse.

Afterwards, the butterfly valve

moves from the Closed to the Open

position and then to the Ignition

position. During the fan run up time

tGV which follows, the fan starts

with the butterfly valve being set to

Ignition position.

After the waiting time tW, the BCU

activates pre-ignition tVZ and then

opens valves V1 and V2 for the

pilot burner. The ignition time tZ is

constant. After the flame proving

period for the pilot burner tFS1, valve

V3 opens to ignite the main burner.

H0

04

05

06

07

08

00

00

H0

01

A1

A0

A2

03

H8

08

P9

02

Switch on BCU 370

Start-up with ϑ signal

In the event of fault signal: Reset

Fan run up time tGV (P20)

Switch-on delay time tE running (P22)

Start-up position/standby

Start-up position/standby

Normal shut-down

via ϑ signal

Flame proving period tFS1

running for burner/pilot burner (P13)

Safety time tSA1 running for

burner/pilot burner (P12),

V1 and V2 open

Butterfly valve moves to Open position

Butterfly valve moves to Closed position

Flame proving period tFS2

running for main burner (P15)

Safety time tSA2 running for main burner (P14),

V3 opens

Butterfly valve moves to Ignition position

Pre-ignition time tVZ running (P21d

Controller enabler signal delay time tRF (P29)

Controller enable signal

Post-purge time tPN running (P19)

If parameter P27 = 0:

V2 is switched off

Waiting time tW

第24页

BCU 370 · Edition 11.08l 24

Function

If parameter 27 = 0, V2 closes at the

end of the main burner safety time

tSA2. The pilot burner is switched off.

Then the flame proving period

for the main burner tFS2 and the

controller enable signal delay time

tRF start to elapse. Afterwards, the

BCU issues the Enable signal to the

controller. If there is no pilot burner,

program steps 06 and 07 will be

omitted.

As soon as the start-up signal (ϑ) is

switched off, post-purge starts. The

butterfly valve moves to the Ignition position during this time, then

to the Closed position. Next the

BCU rests in the start-up position/

standby.

NOTE: Quick Start is not allowed for

units with FM or CSA approval.

H0

04

05

06

07

08

00

00

H0

01

A1

A0

A2

03

H8

08

P9

02

Switch on BCU 370

Start-up with ϑ signal

In the event of fault signal: Reset

Fan run up time tGV (P20)

Switch-on delay time tE running (P22)

Start-up position/standby

Start-up position/standby

Normal shut-down

via ϑ signal

Flame proving period tFS1

running for burner/pilot burner (P13)

Safety time tSA1 running for

burner/pilot burner (P12),

V1 and V2 open

Butterfly valve moves to Open position

Butterfly valve moves to Closed position

Flame proving period tFS2

running for main burner (P15)

Safety time tSA2 running for main burner (P14),

V3 opens

Butterfly valve moves to Ignition position

Pre-ignition time tVZ running (P21d

Controller enabler signal delay time tRF (P29)

Controller enable signal

Post-purge time tPN running (P19)

If parameter P27 = 0:

V2 is switched off

Waiting time tW

第25页

BCU 370 · Edition 11.08l 25

PE

r1 s

r

BCU 370..I1

V1

F1

F3

230V~

l v1 v2

s1

v3 c c

max. 1 A,

253 V max. 1 A,

253 V

V1 C S1 S L A Z M V2 V3 R

C

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

L1 (L1)

N (L2)

PE N

V2

V3

DL DG

min

DG

max

M

3PS

ϑ

p p p I Z

90°

➔ 0

0 ➔ 90°

Function

3.2.5 Controlled air flow

The controlled air flow function is enabled when the

controlled air flow input, terminal 22 or via PROFIBUS,

is activated. Cold air is fed to the combustion chamber,

e.g. for cooling.

Following the air pressure switch DL rest position

check, the BCU 370 starts the fan and opens the butterfly valve to the Open position. The pressure switch

for air DL monitors the air pressure.

If the start-up signal (J) is applied during controlled air

flow, the burner is started. If the elapsed controlled air

flow time is at least as long as the set pre-purge time,

the burner starts immediately after the Ignition position

has been approached. If it is shorter, the total air volume is supplied until the end of the pre-purge time.

Activation of the controlled air flow input is not required

for normal burner start.

Activation of the controlled air flow function during

burner operation will be ignored.

第26页

BCU 370 · Edition 11.08l 26

VG

IC 20

B VA

GIK

L1

V1

4

DG min

9 3

VG..L

V2

5 32

23

21

24

13 17

18

19

20

BCU 370..I1..D3 25

DL

DL

7

DG

M

22

DG

11

DG

pe/2 UVS

29 30 31

26

28

90°

➔ 0

0 ➔ 90°

Function

3.3 Tightness control

On BCU 370..D3, the tightness control monitors the fail-safe function

of the gas solenoid valves if parameter 24 is set to 3.

The aim of the tightness control is

to identify an inadmissible leak on

one of the gas solenoid valves and

to prevent burner start. The other

gas solenoid valve continues working properly and takes over the safe

shut-off of the gas supply.

The test takes place during prepurge. The fan runs and the air

pressure opens the air/gas ratio

control GIK.

In the case of quick start (parameter

06 = 0), the test takes place after

burner operation during post-purge.

The pre- and post-purge times (parameters 18 and 19) must be set so

that their duration is at least as long

as the test period tP.

第27页

BCU 370 · Edition 11.08l 27

VG

VG

IC 20

B VA

GIK

L1

V1 V2

4 5

DG min

9 3

VG..L

V3

6 32

23

21

24

13 17

18

19

20

BCU 370..D3 25

DL

DL

7

DG

M

22

DG

11

DG

pe/2

UVS

29 30 31

26

28

90°

➔ 0

0 ➔ 90°

Function

Downstream of the gas solenoid

valve V2 on the burner side, the pipe

to the burner must be open so that

the space between valves V1 and V2

can be vented.

The pressure switch DG monitors the pressure between the two

valves. It must be set to half of the

inlet pressure pe/2 in order to check

both valves with equal sensitivity.

In pilot/main burner systems with

three gas solenoid valves, V2 and

V3 are checked simultaneously.

第28页

BCU 370 · Edition 11.08l 28

V1 V2

pe pz

START

t

W

pZ > pe

2

t

L = 3 s

t

M

+

+ –

t

L = 3 s

t

M

pZ > pe

2

+

TEST

V2

V2 Ι ➔ 0

V2 OK

V2 0 ➔ Ι

pZ > pe

2

V1 OK V1 V2 OK

V1 Ι ➔ 0

V1 0 ➔ Ι

V1 OK

Function

3.3.1 Program sequence

The program flow chart explains the

process during the TEST phase.

After start-up the waiting time tW

starts to elapse. Then either the left

or right path is executed.

– If the interspace pressure pZ is

greater than half of the inlet pressure pe/2 after the waiting time

tW, V2 is tight. V2 is opened for a

duration of 3 seconds to vent the

interspace. Then the measurement time tM starts to elapse. If

no interspace pressure can be

measured after this time, V1 is

also tight. Both valves have thus

been checked.

– If no interspace pressure pZ can

be measured after the waiting

time tW, V1 is tight. Then V1 is

opened for 3 seconds to fill the

space between the valves. Then

the measurement time tM starts

to elapse. If a pressure can be

measured in the interspace after

this time, V2 is also tight. Both

valves have thus been checked.

第29页

BCU 370 · Edition 11.08l 29

V1 V2

pe pz

START

t

W

pZ > pe

2

t

L = 3 s

t

M

+

+ –

t

L = 3 s

t

M

pZ > pe

2

+

TEST

V2

V2 Ι ➔ 0

V2 OK

V2 0 ➔ Ι

pZ > pe

2

V1 OK V1 V2 OK

V1 Ι ➔ 0

V1 0 ➔ Ι

V1 OK

Function

Leakage is indicated by 36 for the

first valve and 37 for the second.

第30页

BCU 370 · Edition 11.08l 30

Function

3.4 PROFIBUS-DP

PROFIBUS is a manufacturer-independent, open field

bus standard for diverse applications. PROFIBUS-DP is

a bus variant for communication between automation

systems and distributed peripherals at the field level,

optimised for speed and low connection costs.

On PROFIBUS-DP, the individual bus stations are connected via a 2-core shielded cable as standard.

3.4.1 Configuration, Master-Slave procedure

PROFIBUS-DP is structured as a Master-Slave system.

This allows mono-master or multi-master systems to be

implemented.

A distinction is made between three device types:

– DP Master Class 1 (DPM1)

DPM1 devices are central controllers which exchange

data with the distributed stations (slaves) on the basis

of a defined cycle. This includes, for instance, the PLC,

PC, CNC or VME systems with which the PROFIBUSDP is operated.

– DP Master Class 2 (DPM2)

DPM2 devices are programming, project planning or

operator-control devices. They are used for configuration and commissioning of the system or for system

operation and visualisation in ongoing operation.

第31页

BCU 370 · Edition 11.08l 31

Function

– DP Slaves

The devices which transmit input information from

the periphery to the master and which issue output

information from the master to the periphery are referred to as “slaves”.

This also includes the BCU..B1.

The use of a standard bus system offers massive benefits compared to manufacturer-specific bespoke solutions. Time-tested hardware components, standardised

connection methods and a series of tools of bus diagnostics and optimisation are available on the market

from a whole range of manufacturers. The widespread

use of the system ensures that the planning and service personnel are very familiar with how the system operates and how to handle it and can therefore operate

the system efficiently.

3.4.2 Addressing

A maximum of 126 units (masters and slaves) can be

connected to a PROFIBUS-DP system. Each station is

assigned an individual PROFIBUS address which can

be set between 0 and 126 using two code switches on

the BCU..B1 board.

The left switch sets the tens or hundreds for the address, whilst the right switch sets the units.

3.4.3 Network technology

All devices are connected in a bus structure (line). Up

to 32 stations (masters or slaves) can be connected in

a single segment. The beginning and end of each segment is fitted with an active bus terminator. Both bus

terminators must have a permanent power supply to

ensure error-free operation. The bus terminator can be

switched in the lower section of the unit.

If more than 32 stations are implemented or if there is a

need to expand the network area, repeaters (amplifiers)

must be used to link the individual bus segments.

第32页

BCU 370 · Edition 11.08l 32

Function

3.4.4 Configuration

When planning a PROFIBUS-DP system, unit-specific

parameters of each station are to be taken into account.

To allow for simple and standardised planning, the parameters of the BCU..B1 have been summarised in a

so-called device master data file (DMD). The file structure is standardised so that it can be read by the planning units of different manufacturers.

The DMD file can be downloaded from

www.docuthek.com, once you have registered, or is

available on diskette (see Accessories). The steps required to copy the file are described in the instructions

for the automation system.

3.4.5 Bus communication

Input bytes (BCU -> master)

Bit Byte 0 Byte 1 Byte 2 Byte 3

0 Burner operation

Reserved

Status and fault messages

(see Table)

0 – 25.5 μA of the burner

255 steps

1

2 Fault lock-out

3 Controlled air flow

4 Open position reached*

5 Closed position reached*

6 ON

7 Manual mode

Output bytes (master -> BCU)

Bit Byte 0

0 Reset

1 Start-up

2 Controlled air flow

3

4

5

6 Open*

7 Close*

* Only on BCU 370..B1-3, three-point step control via

PROFIBUS-DP

第33页

BCU 370 · Edition 11.08l 33

Function

I/O bytes: The programmer can choose the data to be

transferred.

Inputs Outputs

BCU 370, basic I/O 1 byte 1 byte

BCU 370, standard I/O 4 byte 1 byte

Baud rate: Up to 1500 kbit/s.

The max. range per segment depends on the baud rate:

Baud rate [kbit/s] Range [m]

93.75 1200

187.5 1000

500 400

1500 200

The specified ranges may be increased by using repeaters. No more than three repeaters should be connected

in series.

The specified ranges relate to bus cable type A (twocore, shielded and twisted), e.g. Siemens, Order No.:

6XV1830-0EH10 or Lapp cable unitronic, Order No.:

2170-220T.

第34页

BCU 370 · Edition 11.08l 34

Function 3.5 Program status

Display Program status

00 Start-up position/standby

A0 Butterfly valve moves to Closed position 0 Air monitor rest position check

01 Fan run up time tGV

A1 Butterfly valve moves to Open position 1 Air monitor operating position check

P1 Pre-purge time tPV

A2 Butterfly valve moves to Ignition position

02 Waiting time t

W

03 Pre-ignition time tVZ

04

1st safety time on start-up tSA1

05

1st flame proving period tFS1

06

2nd safety time on start-up tSA2

07

2nd flame proving period tFS2

H8 Controller enable signal delay time

08 Operation/Controller enable

H0 Waits for switch-on delay or min. pause time

C1 Controlled air flow

P9 Post-purge time tPN

In manual mode, two dots blink on the display.

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BCU 370 · Edition 11.08l 35

Function

3.6 Fault message (blinking)

Fault message (blinking) Display Fault lock-out Safety shut-down Warning signal

Flame simulation 01 

Start-up without flame signal 04 

Flame failure during 1st flame proving period 05 

Flame failure during 2nd safety time 06 

Flame failure during 2nd flame proving period 07 

Flame failure during operation 08 

Too many remote resets 10 

Safety interlock failure 50 

Permanent remote reset 52 

Timing cycle too short 53 

DGmin. oscillating 55 

Bus module error E 

Bus fault P

Open + Close set simultaneously 56 

Fault Valve feedback 35 

Tightness control: V1 leaking 36 

Tightness control: V2/V3 leaking 37 

Fault Air monitor break contact check 0 

Fault Air monitor make contact check 1 

Fault Air supply during pre-purge P 

Fault Air supply in program step X X 

Fault DGmax. in program step X X 

Fault DGmin. in program step X X 

Butterfly valve closed position not reached A0 

Butterfly valve open position not reached A1 

Butterfly valve ignition position not reached A2 

第36页

BCU 370 · Edition 11.08l 36

Function

3.6.1 Reaction to process faults

The BCU 370 reacts differently to process faults in different program steps. If, for example, the signal from air

pressure switch DL drops during pre-purge, 1 flashes on the display and a timeout time of 25 seconds starts to

elapse. If the signal is not applied again, the BCU carries out three further start-up attempts.

Process fault BCU 370’s reaction

Signal

(terminal) Signal status During program step

Normal shut-down

Timeout 25 s

Immediate fault lock-out

Safety shut-down

Start-up attempts1)

Restart2)

Fault message

DGmax. (11) drops XX All  X

DGmin. (9) drops XX All except tSA1 + tSA2 4) X

not pending after tSA1 04 tSA1 4) 4

not pending after tSA2 06 tSA2 4) 6

DL (7) pending 0 Rest position check   0

not pending 1 Operating position check   1

drops P1 Pre-purge time   P

drops A2 Valve moves to Ignition position   2

drops 02 Waiting time   2

drops 03 Pre-ignition time   3

drops 04 tSA1   4

drops 05 tFS1   5

drops 06 tSA2   6

drops 07 tFS2   7

drops H8 Controller enable waiting time   8

第37页

BCU 370 · Edition 11.08l 37

Function

Process fault BCU 370’s reaction

Signal

(terminal) Signal status During program step

Normal shut-down

Timeout 25 s

Immediate fault lock-out

Safety shut-down

Start-up attempts1)

Restart2)

Fault message

DL (7) drops 08 Operation   8

drops C1 Controlled air flow   P

ϑ (21) drops XX All except tSA1 + tSA2 

drops 04 tSA1 3)

drops 06 tSA2 3)

Safety interlock (24) drops XX All 6) 50

Flame (13) pending 0 Rest position check   01

pending 1 Operating position check   01

pending P1 Pre-purge time   01

pending A2 Valve moves to Ignition position   01

pending 02 Waiting time   01

not pending after tSA1 04 tSA1   04

drops 05 tFS1   05

drops 06 tSA2   06

drops 07 tFS2   07

drops H8 Controller enable waiting time   08

drops 08 Operation   08

1} According to parameter 07. If the last start-up attempt fails, a fault lock-out occurs.

2} According to parameter 08. If the restart fails, a fault lock-out occurs.

3} Safety time elapses completely.

4} BCU restarts as soon as the signal is applied again.

5) The program sequence is blocked.

6) 4) and 5)

第38页

BCU 370 · Edition 11.08l 38

Parameters

4 Parameters

Description Parameter Value range Default Adjustable1)

Burner flame signal 01 0 – 25 µA

Burner switch-off threshold 02 1 – 20 µA 1 µA v

Last fault signal 03 XX

Air monitoring during pre-purge 04 0 = Off; 1 = On 1 

Air monitoring during operation 05 0 = Off; 1 = On 1 

Pre-purge 06 0 = Quick start;

1 = On each start-up 1 

Burner start-up attempts 07 1 – 4 1 

Behaviour in the event of flame failure during operation 08 0 = Fault lock-out;

1 = Restart 0 

Safety time during operation tSB 09 1; 2 s 1 s 

Minimum combustion time tB 10 0 – 250 s 0 s 

Minimum burner pause time tBP 11 0 – 250 s 0 s 

1st safety time on start-up, burner/pilot burner tSA1 12 2; 3; 5; 10 s 5 s 

1st flame proving period, burner/pilot burner tFS1 13 0; 2; 5; 10; 20 s 2 s 

2nd safety time on start-up, main burner tSA2 14 0; 2; 3; 5; 10 s 3 s 

2nd flame proving period, main burner tFS2 15 0; 2; 5; 10; 20 s 2 s 

Operating time in manual mode 16 0 = Unlimited;

1 = Limited to 5 minutes 1 

UVS check (1 x in 24 hours) 17 0 = Off; 1 = On 0 

Pre-purge time tPV 18 0 – 250 s 30 s 

Post-purge time tPN 19 0 – 250 s 0 s 

Fan run up time tGV 20 0 – 25 s 2 s 

第39页

BCU 370 · Edition 11.08l 39

Parameters

Description Parameter Value range Default Adjustable1)

Pre-ignition time tVZ 21 0 – 5 s 1 s 

Switch-on delay time tE 22 0 – 250 s 0 s 

Min. gas pressure monitoring 23 0 = Off; 1 = On 1 

Digital input function 24

0 = –

1 = DGmax.

3 = Tightness control.

1 v

Valve control 25 0 = Off; 1 = On 1 

Tightness test period tP 26 10; 20;

30 – 250 s 10 s v

V2 during burner operation 27 0 = Off; 1 = On 0 

Quick start starts in 28 0 = Ignition position;

1 = Closed position 0 

Controller enable signal delay time tRF 29 0; 10; 20;

30 – 250 s 0 s 

User-defined password 30 0000 – 9999 XXXX 2)

Bus control activation (on BCU..B1-3) 31 0 = Off; 1 = On 1 v

Bus control limitation (on BCU..B1-3) 32

0 = Closed position

1 = Low position

2 = Ignition position

2 v

The last 10 fault messages 81 – 90 XX

1) Adjustable using BCSoft software and a PC opto-adapter.

2) Will not be displayed.

V = Adjustable

v = Depends on hardware configuration

第40页

BCU 370 · Edition 11.08l 40

Parameters

4.1 Scanning the parameters

During operation, the 7-segment display shows the program status.

The flame signal and all following parameters of the

BCU can be scanned one after the other by repeatedly

pressing the Reset/Information button (for 1 second).

The parameter display is ended 60 seconds after the

last time the button is pressed or by switching off the

BCU.

The BCU 370 indicates when the mains switch has

been switched off. This signals standby mode. On the

BCU 370..B1, the bus switch is still operational to maintain the function of the communication system. The

control outputs of the BCU (valves, ignition unit) are

electrically separated from the mains voltage.

4.2 Flame control

4.2.1 Burner flame signal

Parameter 01

Displays the flame signal in μA.

The BCU measures the flame signal and assesses

whether there is a flame on the basis of the switch-off

threshold.

4.2.2 Burner switch-off threshold

Parameter 02

Determines the value from which a flame signal is detected.

In the case of UV control, this value can be increased,

should the burner to be monitored be influenced by

other burners.

If the flame signal is lower than the set switch-off

threshold, the BCU will not detect a flame.

The measured flame signal of the system’s “own” burner

should be at least 3 μA (empirical value) higher than the

set switch-off threshold.

On the BCU 370..U1 for use with UVD 1, no switch-off

threshold will be indicated.

4.2.3 UVS check (1× in 24 hours)

Parameter 17

Activates an automatic restart of the burner control unit

after 24 hours combustion time.

Systems in continuous operation can be restarted every 24 hours to check UV sensors that are intended for

intermittent operation only.

Parameter 7 = 0: Unlimited burner operation

Parameter 7 = 1: An automatic restart is activated once

every 24 hours. The restart begins with pre-purge (parameter 06, “Pre-purge on each start-up” = 1) or starting the burner in the Ignition position (parameter 06,

“Pre-purge on each start-up” = 0).

The time starts each time the start-up signal (ϑ) is applied.

Since the BCU 370 interrupts burner operation autonomously after 24 hours, it is to be verified whether the

process allows for the resulting break in heat supply.

第41页

BCU 370 · Edition 11.08l 41

Parameters

4.3 Behaviour during start-up

4.3.1 Minimum burner pause time tBP

Parameter 11

Determines the minimum burner pause time.

To stabilise the burner operation, a minimum burner

pause time tBP can be set independently of the central

control system.

If the start-up signal (ϑ) drops after fan start or if a

safety shut-down occurs, a restart is suppressed for the

duration of the minimum burner pause time tBP, which

starts to elapse after expiry of the post-purge time tPN

(parameter 19).

4.3.2 Burner start-up attempts

Parameter 07

This defines the maximum number of possible start-up

attempts of the burner.

For burners which require several start-up attempts

due to longer pipes for example, the BCU can automatically carry out several start-up attempts.

Parameter 07 = 1: One start-up attempt

If a safety shut-down takes place during start-up, e.g.

on account of a flame signal failure, a fault lock-out occurs once the time tSA has elapsed. The display blinks

and shows the cause of the fault.

Parameter 07 = 2 – 4: 2 – 4 start-up attempts

If several start-up attempts are set at the works and if

the BCU performs a safety shut-down during start-up,

it closes the valves after the safety time tSA has expired

and attempts to start up again. Each start-up attempt

begins with pre-purge. Once the last programmed

start-up attempt has failed, the burner control unit performs a fault lock-out, in case no flame has formed. The

display blinks and shows the cause of the fault.

In accordance with EN 746-2 and EN 676 a maximum

of four start-ups are permitted in specific cases if the

safety of the installation is not impaired. Please note

application standards.

NOTE: Only 1 start-up attempt is possible for units with

FM or CSA approval.

第42页

BCU 370 · Edition 11.08l 42

Parameters

4.3.3 Switch-on delay time tE

Parameter 22

88

ϑ

t

21

24

1

16

3

30

29

31

13

19-20

4 V1

6 V3

5 V2

17-18

11 DGmax.

9

32

DGmin.

7 DL

90° ➔ 0

0 ➔ 90°

tSA1

00 H0 05 06

tFS1 tE

01

tGV

P1 A2

tPV tZ1

03 04

tVZ

07 H8

tFS2

A1 08

tRF tSA2

Determines the time between applying the start-up signal (ϑ) and initiating the burner start.

When several burners are activated simultaneously,

setting different switch-on delay times tE prevents the

fans from starting at the same time and reduces the

load on the power supply.

4.3.4 Pre-ignition time tVZ

Parameter 21

88

ϑ

t

21

24

1

16

3

30

29

31

13

19-20

4 V1

6 V3

5 V2

17-18

11 DGmax.

9

32

DGmin.

7 DL

90° ➔ 0

0 ➔ 90°

tSA1

00 H0 05 06

tFS1 tE

01

tGV

P1 A2

tPV tZ1

03 04

tVZ

07 H8

tFS2

A1 08

tRF tSA2

The ignition unit is activated.

The ignition spark can stabilise in the air flow during the

pre-ignition time tVZ.

The valves are still closed during the pre-ignition time

tVZ. Following pre-ignition tVZ, the safety time tSA1

starts to elapse. The valves are opened while the ignition unit continues to operate.

第43页

BCU 370 · Edition 11.08l 43

Parameters

4.3.5 1st safety time on start-up, burner/pilot burner tSA1

Parameter 12

88

ϑ

t

21

24

1

16

3

30

29

31

13

19-20

4 V1

6 V3

5 V2

17-18

11 DGmax.

9

32

DGmin.

7 DL

90° ➔ 0

0 ➔ 90°

tSA1

00 H0 05 06

tFS1 tE

01

tGV

P1 A2

tPV tZ1

03 04

tVZ

07 H8

tFS2

A1 08

tRF tSA2

The safety time on start-up tSA1 determines when the

pilot burner or burner valves will be closed in the event

of flame signal failure.

V1 and V2 are opened and the ignition unit is activated

as the safety time tSA1 starts to elapse. If no flame

signal is pending after elapse of the safety time tSA1,

the BCU performs a safety shut-down. The valves are

closed. The BCU carries out up to 3 further start-up attempts, depending on how parameter 07 “Burner startup attempts” has been set.

The setting of safety time tSA1 is to be determined on

the basis of the burner capacity, the type of control and

the relevant application standard, e.g. EN 746-2, EN

676, NFPA 85 or NFPA 86.

4.3.6 1st flame proving period, burner/pilot burner tFS1

Parameter 13

88

ϑ

t

21

24

1

16

3

30

29

31

13

19-20

4 V1

6 V3

5 V2

17-18

11 DGmax.

9

32

DGmin.

7 DL

90° ➔ 0

0 ➔ 90°

tSA1

00 H0 05 06

tFS1 tE

01

tGV

P1 A2

tPV tZ1

03 04

tVZ

07 H8

tFS2

A1 08

tRF tSA2

Determines the flame proving period of the burner or

pilot burner.

This time elapses before the BCU starts the next program step so as to give the flame time to stabilise.

The flame proving period tFS1 starts to elapse once

safety time tSA1 has expired.

第44页

BCU 370 · Edition 11.08l 44

Parameters

4.3.7 2nd safety time on start-up, main burner tSA2

Parameter 14

88

ϑ

t

21

24

1

16

3

30

29

31

13

19-20

4 V1

6 V3

5 V2

17-18

11 DGmax.

9

32

DGmin.

7 DL

90° ➔ 0

0 ➔ 90°

tSA1

00 H0 05 06

tFS1 tE

01

tGV

P1 A2

tPV tZ1

03 04

tVZ

07 H8

tFS2

A1 08

tRF tSA2

The safety time on start-up tSA2 determines when the

main burner valves will be closed in the event of flame

signal failure.

V3 is opened as the safety time tSA2 starts to elapse.

One second before the end of the safety time tSA2, V2

is closed (parameter 27 = 0, “Interrupted pilot burner”)

or remains open (parameter 27 = 1, “Permanent pilot

burner”). If no flame signal is pending after elapse of

the safety time tSA2, the BCU performs a safety shutdown. Valves V1, V2 and V3 are closed. The BCU carries out up to 3 further start-up attempts, depending

on how parameter 07 “Start-up attempts, burner/pilot

burner” has been set.

The setting of safety time tSA2 is to be determined on

the basis of the burner capacity, the type of control and

the relevant application standard, e.g. EN 746-2, EN

676, NFPA 85 or NFPA 86.

4.3.8 2nd flame proving period, main burner tFS2

Parameter 15

88

ϑ

t

21

24

1

16

3

30

29

31

13

19-20

4 V1

6 V3

5 V2

17-18

11 DGmax.

9

32

DGmin.

7 DL

90° ➔ 0

0 ➔ 90°

tSA1

00 H0 05 06

tFS1 tE

01

tGV

P1 A2

tPV tZ1

03 04

tVZ

07 H8

tFS2

A1 08

tRF tSA2

Determines the flame proving period of the main burner

in pilot/main burner combinations.

This time elapses before the BCU starts the next program step so as to give the flame time to stabilise.

The flame proving period tFS2 starts to elapse once

safety time tSA2 has expired.

第45页

BCU 370 · Edition 11.08l 45

Parameters

4.4 Behaviour during operation

4.4.1 Minimum combustion time tB

Parameter 10

Defines the minimum burner combustion time.

To stabilise the burner operation, a minimum combustion time can be set independently of the central control system.

If the start-up signal (ϑ) drops once the first safety time

tSA1 has started to elapse, the burner remains in operation for at least time tB. The minimum combustion time

tB starts to elapse following controller enable. If the

start-up signal drops before the first safety time tSA1,

e.g. during pre-purge, the control unit reverts directly to

standby and the burner is not ignited.

4.4.2 Controller enable signal delay time tRF

Parameter 29

88

ϑ

t

21

24

1

16

3

30

29

31

13

19-20

4 V1

6 V3

5 V2

17-18

11 DGmax.

9

32

DGmin.

7 DL

90° ➔ 0

0 ➔ 90°

tSA1

00 H0 05 06

tFS1 tE

01

tGV

P1 A2

tPV tZ1

03 04

tVZ

07 H8

tFS2

A1 08

tRF tSA2

Defines the time between start-up of the burner and

controller enable.

The controller enable signal delay time ensures a stable

combustion process, e.g. through uniform heating of

the entire combustion chamber.

The time tRF starts to elapse

after expiry of if

tSA1 tFS1 = 0, tSA2 = 0

tFS1 tSA2 = 0

tSA2 tFS2 = 0

tFS2 tFS1 > 0, tSA2 > 0, tFS1 > 0

The BCU shows program status H8 . After time tRF has

elapsed, the BCU closes the operation signalling contact (terminals 17/18) and activates controller enable

(terminal 25).

第46页

BCU 370 · Edition 11.08l 46

Parameters

4.4.3 Safety time during operation tSB

Parameter 09

Defines the safety time during operation tSB for valves

V1, V2 and V3.

If there is a flame failure while the burner is operating,

the BCU closes the valves within the safety time during

operation tSB. The default in accordance with EN 298

is 1 s. The safety time during operation tSB can also be

set to 2 s. Prolonging the time increases the installation

availability in the case of brief-duration fades of the

flame signal.

The safety time of the installation during operation

(including closing time of the valves) may not exceed

in accordance with EN 746-2 3 s, in accordance with

NFPA 85 and NFPA 86 4 s. Please note application

standards.

4.4.4 Behaviour in the event of flame failure during

operation

Parameter 08

Determines whether a restart will be attempted following a safety shut-down during operation.

For burners with occasionally unstable flame signals

during operation, a one-off restart can be attempted.

Parameter 08 = 0: Fault lock-out after installation fault.

In the event of an installation fault (e.g. flame failure or

air pressure failure), the burner control unit performs a

fault lock-out within the safety time during operation

tSB. This involves disconnecting the power from the gas

valves. The fault signalling contact closes, the display

blinks and shows the current program status (see tables Program status and Fault messages).

Parameter 08 = 1: Restart after installation fault.

If the BCU detects an installation fault (e.g. flame failure) after the second flame proving period has elapsed,

the valves are closed and the operation signalling contact is opened within time tSB. The burner control unit

now attempts to restart the burner once. The restart

begins with pre-purge. For further restart attempts, the

burner must have been operational for at least 2 seconds.

If the burner does not function, a fault lock-out occurs.

The display blinks and shows the cause of the fault.

In accordance with EN 746-2 and EN 676 a restart may

be attempted under certain conditions. The safety of

the system must not be impaired. Please note application standards.

第47页

BCU 370 · Edition 11.08l 47

Parameters

4.4.5 Last fault signal

Parameter 03

The BCU shows the last fault message.

In order to analyse a burner system, the last fault message can be called up. In addition, parameters 81 to 90

show the last 10 messages. Extended diagnostics is

possible using the BCSoft software.

4.4.6 V2 during burner operation

Parameter 27

Determines whether valve V2 is switched off 1 s before

the end of the second safety time tSA2.

On systems with pilot burners, the pilot burner can be

switched off once the main burner is operational.

Parameter 27 = 0: Valve V2 is switched off 1 s before the

end of the second safety time tSA2. (If tSA2 is set to 0,

this occurs at the end of the first flame proving period

tFS1 or at the end of the first safety time tSA1, if tFS1 = 0).

This setting is required for pilot/main burner systems

where the pilot burner does not ignite the main burner

safely in each operating status.

Parameter 27 = 1: Valve V2 remains open during the entire burner operation. This setting is valid for directly ignited burners (tSA2 = 0) and pilot/main burner systems

with permanent pilot burner.

第48页

BCU 370 · Edition 11.08l 48

Parameters

4.5 Monitoring/tightness control

4.5.1 Min. gas pressure monitoring

Parameter 23

Determines whether the minimum gas pressure DGmin.

is monitored.

To ensure that there is adequate gas pressure on the

burner, the pressure can be monitored using the gas

pressure monitor DGmin..

Monitoring takes place in the start-up position/standby,

during burner start-up or during burner operation. If

the signal is not applied, a locking warning signal is

triggered and the display shows X , “Fault DGmin. in

program step X”. When the signal is applied again, the

BCU 370 attempts to restart the burner, provided the

start-up signal (ϑ) is pending.

The requirement for monitoring of the minimum gas

pressure is stipulated in the relevant application standard.

4.5.2 Digital input function

Parameter 24

Defines the function of the input on terminal 11.

Parameter 24 = 0: Input has no function.

Parameter 24 = 1: Monitoring of the maximum gas

pressure DGmax..

To ensure that the permissible gas pressure on the

burner is not exceeded, the pressure can be monitored

using the gas pressure monitor DGmax..

Monitoring takes place in the start-up position/standby,

during burner start-up or during burner operation. If

the signal is not applied, a fault lock-out occurs and the

display shows X , “Fault DGmax. in program step X”.

Parameter 24 = 3: Monitoring of the pressure switch

between V1 and V2/V3 for tightness control (only on

BCU..D3). See “Function – Tightness control”.

第49页

BCU 370 · Edition 11.08l 49

Parameters

4.5.3 Air monitoring during pre-purge

Parameter 04, activated automatically if parameter 05

“Air monitoring during operation” has also been activated.

This parameter determines whether the air pressure is

monitored during pre-purge.

To ensure that there is actually air pressure during prepurge, the pressure can be monitored using the air

monitoring during pre-purge function.

Parameter 04 = 0: No air monitoring during pre-purge. A

decrease in the air pressure or a failure in air supply will

not be detected.

Parameter 04 = 1: Air monitoring during pre-purge. Air

pressure switch signal to terminal DL (7). The BCU

checks whether the air monitor signal changes:

– Check of the LOW signal (no air monitoring signal)

Before pre-purge, no signal may be present. A LOW

signal must be applied to input DL.

If the LOW signal is not applied, the BCU performs a

fault lock-out once the delay time of 25 seconds has

elapsed. Fault message: 0 , “Fault DL static control”.

– Check of the HIGH signal (air monitoring signal activated)

Once the fan has been activated, the BCU checks

whether the air monitor switches while the actuator

moves to the Open position (start-up with pre-purge)

or during the waiting time (quick start). The signal to

input DL must be switched to HIGH. If the HIGH signal is not applied, the BCU performs the set number

of further start-up attempts (parameter 07) after a

delay time of 25 seconds has elapsed. If no further

start-up attempts have been parameterised, a fault

lock-out occurs and fault message 1 , “No air supply

during start-up”, is displayed.

Air pressure must be present and a HIGH signal must

be applied to input DL during the subsequent prepurge. If the HIGH signal is not applied, the BCU performs a safety shut-down once the delay time of 25

seconds has elapsed. If no further start-up attempts

have been parameterised (parameter 07), a fault lockout occurs and fault message P , “No air supply during

pre-purge”, is displayed.

Depending on the application standard, different air

monitoring methods are possible. Along with pressure

monitoring, other functions such as fail-safe feedback

signals from the actuator or air flow monitoring devices

may be required. Please note application standards.

第50页

BCU 370 · Edition 11.08l 50

Parameters

4.5.4 Air monitoring during operation

Parameter 05, if activated, parameter 04 “Air monitoring during pre-purge” is also activated.

This parameter determines whether the air pressure is

monitored during burner operation.

To ensure that there is actually air pressure during burner operation, the pressure can be monitored using the

air monitoring during operation function.

Parameter 05 = 0: No air monitoring during operation. A

decrease in the air pressure or a failure in air supply will

not be detected.

Parameter 05 = 1: The air pressure is monitored during

operation. During burner start (after pre-purge until

the end of the main burner safety time tSA2) and during

burner operation (after the end of main burner flame

proving period tFS2 until the end of normal operation),

the air must flow and a HIGH signal must be applied to

input DL. If the HIGH signal drops, the BCU performs a

safety shut-down.

– DL signal drops during burner start.

If further start-up attempts have been parameterised

(parameter 07), a further burner start-up attempt

is made. If no further start-up attempts have been

parameterised, a fault lock-out occurs and fault message X , “No air pressure on DL in program step X”, is

displayed.

– DL signal drops during burner operation.

If a restart is parameterised (parameter 08), a one-off

burner restart is attempted. If the restart option is not

activated, a fault lock-out occurs and fault message

X , “No air pressure on DL in program step X”, is displayed.

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