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AIM-T300 Insulation Monitoring
Device
Installation and Operation Manual V1.3
Acrel Co., Ltd.
Declaration
Please read this manual carefully before using these products, in which the involved pictures,
logos, symbols, etc. are all reserved by the Acrel Electric Co., Ltd. Personnel not inside the company
shall not publicly reprint all or part of the contents without written authorization.
Before using the product, please read the tips and precautions in this operation manual, and Acrel
does not take responsibility for personal injuries or economic losses caused by ignoring tips of this
manual;
The contents of the manual will be continuously updated and revised, thus the products functions
in this manual may inevitably have a slight discrepancy with the real objects during the continuous
upgrading process. Users should give first place to the purchased real products, and can search www.
acrel.cn to downloads or through sales channels to obtain the latest version of the manual.
Contents
1 Introduction............................................................................................................................. 1
2 Functional characteristics ...................................................................................................... 1
3 Type Introduction.................................................................................................................... 1
4 Technical parameters ............................................................................................................. 2
5 Reference standards................................................................................................................ 2
6 Installation and connection .................................................................................................... 2
6.1 Outline dimension.............................................................................................................. 2
6.2 Method of installation ........................................................................................................ 3
6.3 Wiring method.................................................................................................................... 3
6.4 Matters need attention........................................................................................................ 4
7 Program and usage ................................................................................................................. 5
7.1 Panel description................................................................................................................ 5
7.2 LED instructions................................................................................................................ 5
7.3 Function description of keys.............................................................................................. 5
7.4 Operation instructions of keys ........................................................................................... 6
8 Address table ........................................................................................................................... 8
9 Typical applications ................................................................................................................ 9
1
AIM-T300 Insulation Monitoring Device
1 Introduction
AIM-T300 insulation monitoring device is designed and developed by Acrel gathering the
design experience of electric power meter industry for many years to monitor the insulation
condition of low voltage IT distribution system (ungrounded system). The product adopts advanced
micro controller technology, with high degree of integration, compact size and easy installation, and
it integrates intelligence, digitalization and networking. The device, with many functions such as
insulation fault warning, fault alarm, event recording and so on, can be used in the mines, glass
factories, electric furnaces and test facilities, metallurgical plants, chemical plants, and exploded
dangerous places, computer center, emergency power supply and other places to monitor the
insulation status of IT system in real time. When insulation fault occurs, it will alarm and remind
the staff to check the fault.
The products conform to the requirements of enterprise standard Q/VDCL-26-2017 IT System
Insulation Monitor.
2 Functional characteristics
2.1 Function of monitoring, fault warning and alarm the ground insulation resistance for IT system;
2.2 Multiple fault indication function, such as relay alarm output, LED alarm indication and so on.
2.3 Advanced field bus communication technology, communicate with the external alarm and
display device or the upper computer management terminal and monitor the operation status of the
IT system in real time.
2.4 Fault event recording function. It can record the time and type of failure to provide convenience
for operators to query and analyze the operation status of the system and eliminate faults in time.
2.5 Applicable for insulation monitoring of AC, DC and AC / DC hybrid IT systems.
2.6 Self checking function. realize the fault self-inspection of instrument hardware circuit.
2.7 Broken line monitoring function. Monitor the connection condition between the L1/L2 and the
IT system and the connection condition of the PE/KE function grounding wire.
3 Type Introduction
AIM
Design Number
Type of Product
Application
T 300
Instructions: AIM for Acrel Insulation monitoring device; T for Industrial; 300 for 300 type.
2
4 Technical parameters
5 Reference standards
5.1 IEC 61557-8:2014 Electrical safety in low voltage distribution systems up to 1000V a.c. and
1500V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 8:
Insulation monitoring devices for IT systems
5.2 IEC 61326-2-4:2020 RLV Redline version Electrical equipment for measurement, control and
laboratory use - EMC requirements - Part 2-4: Particular requirements - Test configurations,
operational conditions and performance criteria for insulation monitoring devices according to
IEC 61557-8 and for equipment for insulation fault location according to IEC 61557-9
6 Installation and connection
6.1 Outline dimension
AIM-T300 externality and installation size (unit: mm)
Accessory
power
supply
Voltage AC85~265V
Voltage
range
System voltage AC/DC 0~480V
Frequency 50/60Hz Frequency range 40~460Hz
Insulation
monitoring
Measuring range 1k~5MΩ Output Relay output Early warning, Alarm
Alarm range 10k~5MΩ
Environ
ment
Working temperature -10~+55℃
Response time
(Ce=1μF)
<6s Storage temperature -20~+70℃
Measuring
voltage
<20V Relative humidity
<95%, without
condensation
system leakage
capacitance
<150μF Altitude ≤2500m
Internal
parameters
Measuring
current
<170μA Communication RS485，Modbus-RTU
Internal DC
impedance
≥120kΩ
Rated impulse voltage /Pollution
Level
8kV/Ⅲ
Power
dissipation
<8W EMC/ Radiation IEC61326-2-4
3
AIM-T300
ON COMM
ESC
TEST MENU
Front view Back view
Side view
The above chart is the front view, rear view and side view of the AIM-T300 insulation
monitoring device of the embedded installation in succession.
6.2 Method of installation
The AIM-T300 insulation monitoring device adopts embedded installation, and the above
diagram is the hole dimensional drawing of the insulation monitoring device.
6.3 Wiring method
Upper terminals: the instrument functional grounding wire, KE, PE (28, 29), needs to be
4
connected to the field equipotential grounding terminal respectively. L1, L2 (4, 5) link to the
monitored IT system (Three phase IT system is connected to any 2 phase).
Functional Earthing IT system
Lower terminals: U1, U2 (1, 2) terminals are auxiliary power interface of insulation
monitoring device; A, B (18, 19) terminals are A and B line interface for RS485 communication
respectively. It is used for communication with upper computer. DO1+ and DO1- (12, 13), DO2+
and DO2- (14, 15) are 2 sets of relay outputs, and they respectively correspond to the two kinds of
control outputs: fault warning and fault alarm.
Power supply Communication Relay output 1、2
6.4 Matters need attention
6.4.1 When wiring is installed, connection should be made in connection with the wiring diagram.
The wiring should be inserted the corresponding terminal of the instrument and tighten the screw
after pressing by the needle socket joint to avoid improper operation of instruments due to poor
contact.
6.4.2 The device provides asynchronous half duplex RS485 communication interface, adopts
Modbus-RTU protocol, and all kinds of data information can be transmitted on communication
lines. In theory, up to 128 devices can be connected to one line at the same time. Each device can
set its address and baud rate through the menu. It is recommended to use shielded twisted pair when
communicating with the upper computer system. The cross section of each core should not be less
than 0.5mm2
, and they connect to A, B respectively. When shielding layer is connected to earth,
wiring should be kept away from strong cable or another strong electric field. It is recommended
that a matched resistance in parallel should be added between the A and B terminals of the most
terminal insulation monitoring device, and the recommended resistance is 120Ω .
6.4.3 The relay output , without power alarm , is a passive output, so an extra power supply is
required for the alarm(or caution light).
5
7 Program and usage
7.1 Panel description
AIM-T300 panel
7.2 LED instructions
4 LED indicators are used to indicate the status of the insulation monitoring device:
“ON”: when the device is working normally, the indicator lights flicker, and the scintillation
frequency is about once a second.
“COMM”: when the device has communication data to receive or send, the indicator lights
flicker.
“WARNING”: When the insulation resistance of the monitoring is less than the warning value,
the warning indicator lights flicker.
“ALARM”: when the insulation resistance of the monitoring is less than the alarm value, the
alarm indicator lights flicker.
7.3 Function description of keys
There are four buttons in the device. They are TEST/ESC, left key, right key, MENU /
respectively.
key Key function
TEST / ESC In the non-programming mode, it is used to start the instrument self-checking function;
In programming mode, it is used to exit.
Left key, right key In the non-programming mode, it is used to read the log at the alarm record interface;
In programming mode, it is used to increase or decrease the figure.
MENU/ In non-programming mode, press button to enter programming mode;
In programming mode, they are used as return confirmation or selection key.
Logo
LCD
Key
LED
6
7.4 Operation instructions of keys
7.4.1 Key operation under the main interface
(1) When starting up, enter the main interface by default. If there is no other key operation, the
system will go into the main interface and work. The insulation resistance value, the leakage
capacitance value and the current system time are showed on the main interface.
(2) Check the alarm record. In the main interface, one can enter the event record query
interface by pressing the “left” or “right” to turn the page to successively query the most recent 20
fault records. The first one is the latest record, and the twentieth record is the oldest one.
(3) Self-examination of the instrument. When press the "TEST" button, the monitor will start
the self-examination program to simulate insulation faults and system errors. The 4 LED lights are
on at the same time, and the relay is closed. The self check results will be displayed after 2S or so to
determine whether the function of the instrument is normal.
7.4.2 Parameter setting
(1) Enter the menu.
Under normal operation, enter the password input page by pressing the key. Set the size of
number by "left" and "right", press "ESC" to enter the menu after inputting the correct password.
Otherwise, the password error will be displayed and automatically returned after 1s.
(2) Password setting
Select the option [password settings] after entering the menu, and press the "left button" and
"right button" to reset the system password (support long press). Press the "ESC" key to select exit,
and whether to save the settings can be chosen, then press the "ESC" key to confirm and then exit.
The operation examples are as follows:
7
(3) Alarm setting
The alarm setting is set up for the size of the insulation warning value and the insulation alarm
value of the system. It is at the same level as the "password setting", and has the same entering step.
The following is the operation demo of the setting of the early warning value and alarm value.
(System default alarm value is 38K, early warning value is 60K)
Press Enter to choose to alter the early warning value or alarm value, press left or right key resize,
then press .
(4) Communication settings
Set up communication address and baud rate, the examples are as follows:
8
(5) The setting of other information
"Time setting", "LCD setting" function are also included in the insulation monitoring
device. The settings of these parameters are similar to those of the above operation, so no
examples are repeated here.
(6) Clear SOE
This function is used to clean up fault record information.
(7) SW info.
This function is used to look up the software information.
8 Address table
Number Address Parameter Read/write Number range Word
1 0000H Passwords R 0000-9999 (default：0000) 1
2
0001H high byte Address R 1~247 (default：1)
0001H low byte baud rate 1
R
0~3: 4800, 9600, 19200, 38400 (unit: bps)
(default: 9600)
3
0002H high byte Contrast ratio R 15-60 (default: 30)
1
0002H low byte Display time R 15~250 (unit: second) (default: 60, 15 light)
4
0003H high byte year R/W 0~99 (unit: year) (default: 0)
1
0003H low byte month R/W 1~12 (unit: month) (default: 1)
5
0004H high byte day R/W 0~31 (unit: day) (default: 1)
1
0004H low byte warning mark R 0: no 1: warning 2: early warning and alarm
6
0005H high byte hour R/W 0~23 (unit: hour) (default: 0)
1
0005H low byte minute R/W 0~59 (unit: minute) (default: 0)
7
0006H high byte second R/W 0~59 (unit: second) (default: 0)
1
0006H low byte data stable R 0 or 1 (0 invalid, 1 stable)
8
0007H high byte warning value
(high 8 bit)
R/W
60~4999 (unit: k Ω) (default: 60)
1
0007H low byte warning value
(low 8 bits)
9
9 Typical applications
Typical connection diagram
9
0008H high byte alarm value (high
8 bits)
R/W
10~4999 (unit: k Ω) (default: 38)
1
0008H low byte alarm value (low
8 bits)
10
0009H high byte insulation
resistance value
(high 8 bits)
R
1~5001 (unit: k Ω)
1
0009H low byte insulation
resistance value
(low 8 bits)
11 000AH SN (high 16 bits)
R
Default: 0000000000
2
12 000BH SN (low 16 bits)
13 000CH reserve 1
14
000DH leakage capacity
value
R
0~150 (unit: μF)
1
15
000EH high byte Symbol of broken
line R
0: no 1: L1 broken line 2: L2 broken line
4:PE/KE broken line 1
000EH low byte current period 2~200 (unit: s)
16
000FH high byte
Whether access
system R
0: no access system 1: access system
1
000FH low byte reserve
17
0010H high byte
incid
ent
recor
d 1
STA1
R The sequence number of incident record
1
0010H low byte R
Incident1content: 0~2
0: a fault free record
1: early warning
2: alarm
18 0011H
insulation
resistance
value
R
incident 1 insulation resistance value
0~early warning set value (default: 0~50)
(unit: k Ω)
1
19
0012H high byte Year1 R incident 1 time -year
1
0012H low byte Month1 R incident 1 time -month
20
0013H high byte Day1 R incident 1 time -day
1
0013H low byte Hour1 R incident 1 time -hour
21
0014H high byte Minute1 R incident 1 time -minute
1
0014H low byte Second1 R incident 1 time -second
22~116 0015H-0073H
The remaining 19 events are recorded in this part of the space, and the rules and formats
are the same as the first.
10
N
U
V
W
PE
This line is connected to the field line
respectively
AC 220Vdevice power supply
?three-phase isolation transformer
N line cannot be grounded
AIM-T300 insulation monitor is applied to the
connection diagram of 3-phase IT system
Note: if the voltage is not 220V, another AC220V should be led in to provide electricity for the ammeter
L1
L2
PE
?single-phase isolation transformer
AIM-T300 insulation monitor is applied to the
connection diagram of single phase and DC IT systems.
RS485communication, connect with the other
instrument hand in hand and connect to the
upper computer(if there is; if not ,no line)
Connect to the PE line with two
separate lines
U
V
W
PE
Connect
three-phase load
L+
LPE
DC ungrounded system
Connect DC
load
Connect to the
ingle-phase load s
1 2 18 19 12 13 14 15
U1 U2 A B
4 5
L1 L2
28 29
PE KE
1 2 18 19 12 13 14 15
U1 U2 A B
4 5
L1 L2
28 29
PE KE
1 2 18 19 12 13 14 15
U1 U2 A B
4 5
L1 L2
28 29
PE KE
1 2 18 19 12 13 14 15
U1 U2 A B
4 5
L1 L2
28 29
PE KE
This line is connected to any 2 item
respectively
RS485通讯
This line is connected to L1, L2
respectively
RS485通讯
This line is connected to L+, Lrespectively
RS485通讯
Connect to the PE line with two
separate lines
Connect to the PE line with two separate
lines
Connect to the PE line with two
separate lines
?three-phase isolation transformer
AC 220Vdevice power supply AC 220Vdevice power supply AC 220Vdevice power supply
Connect
three-phase load
