protection.When the buzzer of this sign alarms,the user should replace the first-level floating ballin time.

6.Common faults and troubleshooting methods

1.The operating pressure cannot reach the set pressure during commissioning

Confirm: Is the incoming water source suficient?Are the water inlet and outlet valves open? ls the pump deflated?Isthe pump reversed? Is there any debris in the pump body?Is the sensor shut-off valve open? Is the pressure gauge or pressure sensor blocked by debris?Is the check valve installed backwards ordamaged? Is the coupling dislodgedorloose?Is theseal damaged?Is the frequency of the automatic downconverter normal? Is there a phase loss in the power supply? Is the pipeline of the other party burst or appears to circulate with the water?

2.Not start manually during commissioning

Confirm:ls the set value of the electric contact pressure gauge correct? Is the wiring of the electrical contact pressure gauge correct? Is the electrical contact pressure gauge in good condition? Is the line good?Is the control powersupply normal?At present,the device usesan electrical contact pressure gauge,and the device can be manually activated only when the black pointer is below the green pointer.

3.Lowwater level alarm

Confirm: ls the water supply of the equipment normal? Is the water supply sufficient after the pumpis started?Is the wiring of the low water level sensor normal? Is the low water line damaged? Is the levelrelay burned out?Laminationequipmentconfirmswhether the imported electrical contact negative pressure gauge is set properly?

4. High pressure alarm

Confirm: ls the high pressure alarm set point correct? Is there any problem with the operating pressure and time setting of the auxiliary pump of the water pump? Is there any problem with the other party'spipeline?Is the pumpselectionappropriate?ls the inverter running well? Is thePIDset point appropriate?

5.Lowpressurealarm

Confirm: Is the low pressure set point reasonable?Is thereashortage of water in the steady flow tank and the pipeline,check whether the water inlet valve is open? Is the low pressure alarm delay time set properly?

6.Motoroverloadalarm

Confirm: Is the power supply voltage normal? Is the water pump clogged? Does the medium concentration meet the standard? Is the line contact good? Is the thermal relay setting too small? ls the rated motor current of the inverter properly set?

7.Sensorabnormalalarm

Confirm: ls the sensor wiring correct? Is the sensor wiring damaged? Is the sensor damaged? Are the panel terminals in good condition?

8.Inverteralarm

Confirm:Check the alarm record of the inverter,and the corresponding alarm conditions and solutionsare listedinthemanual

9.The switchboard circuit breaker trips during startup

Confirm: Does the model of the circuit breaker used by the customer meet the requirements? ls ita 4Pearth leakage circuit breaker?Is the wiring normal?Forvolt-grounded,high-resistance-grounded,or asymmetricaly-grounded grids,ABB drives need to remove the grounding screws EM1 and EM3on the internal RFl filter.

10.Thedevicedoesnotstartwithoutalarm information

Confirm: Is the phase sequence wrong?Whether the phase sequence protectoris damaged,and whether the set pressure is set incorrectly.Is the control method of the inverter correct?The normal controlmethodis Remote (REM).

Mechanical

1.Unable tostart

Analysis:First, check the power supply situation:whether the joint connection is firm; whether the switch contact is tight; whether the fuse is blown; whether the three-phase power supply is lacking equal.If there isan open circuit,poor contact,blown fuse,or lack of phase,the cause should be found outand repaired in time.Secondly,check whether it is the mechanical failure of the pump itself. Common reasons are:the packing is too tight or the impeller and the pump body are blocked by debris;the pump shaft,bearing and leakage reduction ring are rusted; thepump shaft is severely bent, etc.

Remedy: loosen the packing and clear the water diversion groove; disassemble the pump body to remove sundriesand rust;remove the pump shaft for calibration or replace itwitha new one.

2.The water pump is hot

Analysis:Whether the motor and the water pump coupling are properly connected (the axis of the motorconnecting shaft is notright),the bearing isdamaged,the clearance of the roling bearing or the bracket coveris too small,the pumpshaft is bent,the balance hole on the impelleris blocked,the impeller isoutof balanceandincreases thrustto theside.

Remedy:replace the bearing;remove the back cover,adda gasket between the bracket and the bearing seat;lnvestigate the pump shaft or adjust the concentricity of the two shafts;Adjust the coupling properly;Add clean grease (motor bearing)，grease (account forabout 6 0 % of the gap in the bearing;Remove the blockage in the balance hole.

3.Insufficient flowrate

Analysis:The powerspeed isnot matched,so the speed is low;the instalationangleof theaxial flow pump blade is too small;thelift is insuffcient,the pipeline is too long or the pipeline hasaright-angle bend;the suction liftis too high;the botom valve,pipeline and impellerarepartially blocked or Impeller defect; serious leakage of water outlet pipe.

Remedy:restore therated speed,adjust the bladeangle,reduce the installation positionof the water pump,shorten the pipelineor change the curvature of the pipeline,seal theair leakage of the waterpump,press the packing,remove theblockage,replace the impeler,replace the leakage reducing ring,block leaks.

4.No water suction

Analysis:There isair in the pumpbody or gas accumulation in the water inlet pipe,the water diversion is not enough to fillthe pump cavity, the vacuum pump packing is seriously leaking,and the gate valve or the flap door is not closed tightly.

Remedy:first press the waterup,then fillthe pump body with water,and thenstart the machine.At thesame time,check whether the check valve is tight,and whether there isair leakage in the pipeline and joint.If there isany leakage,applylubricating oil or blending paint to the joint after disassembly， tighten the screw,reduce the lift,and press the nozzle of the water pump. 0 . 5 \mathsf { m } into the water.

5.Mechanicalseal leaks

Working principle:Mechanical seal,also knownasend face seal,hasapairofend faces perpendicular to the rotating surface.Under the action offluid pressure and compensating mechanical external elastic force,the end face relies on the cooperation of the auxiliary seal to keep fit with the other end and slide relative to each other.,thereby preventing fluid leakage.

Replacement precautions:Because the mechanical seal runs together with the pump shaft for a long time,itisa wearingpart.Cavitation isstrictlyprohibited,andafter-salespersonnel must know how to replace the mechanical seal.If the replacement is not correct,it willcause water leakage in light,and wear on the shaft string of the pump or damage to the motor bearing in severe cases. (The replacementof themechanicalseal requiresactualoperation).

6.Bearing damage

Reason: Improper assemblyof the bearing,such as uneven tapping on the inner ring of the bearing during cold loading,which causes theshafto be worn,resulting in the loss ofthe interferencebetween theinnerringof the bearing and the bearing orthe reduction of the interference,and the phenomenon of running the inner ring occurs.When installing the motor end cover Uneven knocking causes the end cover bearing chamber and the bearing outer ring to fit too looselyand the outer ring runs out.The bearing cavityis notcleaned or the grease added is notclean,resulting indamage tothebearing raceway during operation,causing the temperature to rise too fast and burning the bearing.

Bearing Replacement:When replacing the bearing,the tool is used and the method of disassembly andassembly iscorrect.Use special tools todisassemble.For thecase thatthe bearing is leftin the end cover,theend cover can be placed upwardsand placed on two iron plates smoothly,anda piece of metal tube with a diametersmaler than the shaft diameter can be tapped on the pad to make the outer ring of the bearing bestressed,knock out the bearing;when instaling,the side with the mark should faceoutward.

Electronic control parts

1.Contactor failure

1)The contactor is stuck -the cause of the contactor being stuck is that dust or impurities have entered the contactor,causing the main contact to stick.Or the main line connectoris in poor contact, the three-phase current isunbalanced,oneof the phase current is too large,and the main contact sticks.There isalso the qualityof thecontactor itself,which needs tobereturned to thefactory for repairorreplacement.

2)The contactorcoil is burnt out-check whether thecoil voltage is too high,or there isavoltage that does not pullin.The normal resistance of the 220VAC contactor coil is: 370\~550Q.

2.Thermal relay failure

1)Reasonsand countermeasures forrefusal toact-the thermal relay does notmatch the motorand

other equipment.The rated seting value is too large or inappropriate,causing the thermal relay to refuse to operate.The rated technical parameters should be re-selected. /ideontimes Due to short circuit on the load sideor excessive load current.Repeated short-term operation frequency is too high or mechanical mechanism failure,so that the thermal relaycan not operate,resulting in thermal element burnout ordewelding refusal tooperate.The thermal relayshould be replaced withanewone.

3.Intermediaterelayfailure

1) The coil has voltage input contact and does notact-the intermediate relay core coil is burnt or thecontact between the intermediate relay base and the core contact is poor and needs to be replaced.2)The coil power-off contact does not act-the contact may be heated and stick due to excessive load,pleasereplace the intermediaterelaycore in time.

Inverterspecific faultdescription (NQ/NSQ)

1.Code Er-22 ultra-high pressure seting (touch screen/LCD display is high pressure alarm) lote

Description: When the actual pressure reaches the ultra-high pressure seting value and keep it for 3 seconds,itwillalarm,thecontentofthealarmisEr-22,andthe touchscreenwilldisplayahigh-pressure alarm (cannot be resetautomatically) Suggestion:Pleaseuse this function reasonably (Pr-30 ultra-high pressure alarm).recommends that the setting range is 2.5\~3.Obar higher than the set pressure.

2.Code Er-23 sensor fault diagnosis (touch screen/LCD display is abnormal pressure iensor)

Description: When there are more than one pressure sensor at the outlet during the linkage operation, the values of the two sensorsare detected.If the diference between the values is more than1 bar,an alarm willoccur,and thealarm codeis Er-23.Alarm displayTSF2 (inverter),touchscreen/LCDdisplay.

3.The alarm shows that the sensor isabnormal (cannot resetautomatically)

Suggestion:If the above alarm occurs,please check whether the sensor wiring is correct? ls the sensor wiring damaged? Is the sensor damaged?Is thedetection hole blocked? Compare the error between the output pressure of the inverter with the sensor and the outlet pressure gauge to determine the faulty sensorand replace it.

7. Limited Liability

·Thank you very much for using Dooch frequency conversion water supply products. Duke water

supply equipment adopts the mostadvanced control technology and frequency conversion technology,and is manufactured under strict production management.Equipment installation personnel must be trained by professionalsand follow the instructions of this installation manual.Installation,once the productfails,Dooch pumpand itsauthorized service center willwholeheartedly provide you with timely andhigh-qualityservice.

·The product warranty period is 12 months from shipment

·During the warranty period,the repair and replacementof parts does not affct the overall warranty period of the original product.If the warranty period of the original product is less than 6months,the replaced partswill still enjoy the 6-month warrantyperiod.If theequipment exceeds the warranty period,please confirm relevant matterswith theafter-salesservice personnel

·When the product is found to be faulty,please check and eliminate the fault in detail according to the instructions in the manual.If the fault cannot be eliminated,please contact Dooch Pump.or the nearest service center,and you need to provide the product model on the product nameplate and serial number.We will provide corresponding maintenance services in the shortest possible time.

·When the product is used under normal conditions during the warranty period,Dooch will provide warrantyservice for failures causedby non-userreasons. * Forproducts not covered bywarranty,a reasonable charges for partsand maintenancewillbecollected after the repair iscompleted.

8.The manufacturer is not responsible for the followings:

·Expenses incurred due to incorrect installation,commissioning，maintenance，alteration，or environmental conditions that do not meet the requirements in the accompanying documents orother relevant documents.

·Equipment misused, neglected or accident caused. ·Customer Supplies included with the device

Neitherthe manufacturernor the supplier nor the distributorshallbe liable foranyspecial,indirect or consequential damages,losses or finesarising outof the above.If you have questions about Dooch products,please contact your local office ordistributor.

Technical data,information,specificationsare validatthe time of printing of this manual.The manufacturer reserves the right to make changes without prior-notice.

·Safety,Guidelines
·Purpose
·Inspection items and procedures

1 Safety guide

Warning! Only professional technicians or trained and qualified personnelare allowed to perform maintenance!
AWarning! Even if the motor has stopped,there are dangerous voltages on the inverter power terminals U,V,W!
Warning!Power offor5minutes before operation.
Warming! Do not attempt to install，disassemble and clean upinternal dust while tedevice is powered on!

2 Purpose

For the sake of convenience and safe operation of the equipment,the items and sequences of inspectionand maintenanceafter the equipment is runningare provided below.

3 Inspection items and procedures

3.1 Check the control cabinet and sensors

(1)Whether the display on the panel of the control cabinet and the status of the switch position are
normal (if there isa voltage orammeter,itshould beobservedwhether the displayedvoltage and
current are normal); (2)Whether the axial flow fan of the control cabinet is running normall; (3)If there isan alarmon the panel of the control cabinet,troubleshooting should be carried out
accordingto thespecificalarmcause; (4)Regularly clean the dust in the control cabinet,and check whetherthe connection of each cable
is firm; (5)Whether the status of each sensor connected to the control cabinet is normal.

3.2 Installation procedure

(1) Check whether there is water leakage at the connection parts of pipelinesand valvesand at the welding seams toprevent water leakage caused bydamage to gasketsor rubberwashers;

3.3 Check motor and pump

(1) Check whether the running direction of the motor is normal; (2)When theequipmentis turned offromwaterand then watered again,thewater pumpair release valve should be opened,and theair will return to itsoriginal stateafter theair is discharged; (3)If there is any abnormal noise in the operation of the motor and the water pump,equipment maintenanceshould be carried out according to the specific situation.

3.4Checkthe pressuretankand regulatingtank

3.4.1Pressure Tank Installation

3.4.1.1Use suitable bolts to fix the pressure tank on the solid concrete platform or the connection plateof the boostersystem

3.4.1.2The charging pressure requirements of the pressure tank,the factory pre-charging pressure is 1/3\~1/2of therated pressure of theequipment,and the gas ischarged according to the requirements of the pressure tank after arrvingatthe site.Some tank maker's pressure tanks without inflation requirements,thesupplementarygas shall be caried outaccording toour factory standards.If the pressure tank has pre-inflated pressure requirements, the required air pressure is 7 0 % of the rated pressure of the equipment,and it should be inflated as required.

3.4.1.3Do not over-pressurize the pressure tank.Pre-charge the pressure tank within the allowable ambient temperature of the pressure tank.If the pre-charge pressure of the pressure tank exceeds 4bar,the operation stepsare as follows:

① Adjust the pre-charge pressure of the pressure tank to 4bar; ② Install the pressure tank into the system; ③ Use the system to add water to the pressure tank,stop when it reaches the pre-charge pressure (4bar)of the pressure tank,and make the pressure tank airbag pressure balanced; ④ Increase the pre-charge pressure by up to 3bar each time,and then adjust the system pressure to thenew pre-charge pressure by injecting water into the system;

⑤ Repeat steps 3and 4 until the required pre-charge pressure is reached.

3.4.1.4 Valves shallbe installed on the pipelines connecting the pressure tanks,which can be used during commissioing and maintenance

3.4.1.5 Before the water pump is pressurized,the valve connected to the pressure tank must be opened,so that the natural pressure in theair bag of the pressure tank is flled with water,and the waterpumpcanbeoperatednormallyafterconfirming that it is full

3.4.1.6 Do not open the flange cover on the pressure tank during instalation,otherwise there will be dangerand air leakage,which will also affect the service lifeof the pressure tank airbag.

3.4.2Pressure Tank Maintenance

3.4.2.1The pressure tank should check the air pressure every month when the equipment is just commissioned and run,and every quarter after the equipment has been used for one year.

3.4.2.2When checking the pre-charge pressure of the pressure tank,it is necessary to close the valve connecting the pressure tank to the system,drain the water in the pressure tank,and refillte pressure tank when necessary.

3.4.2.3When the air pressure of the pressure tank is lower than 1/3\~1/2 of the rated pressure of the equipment required by the factory,or lower than theair pressure required by the pressure tank,it needs to be supplemented,and the gas supplementation steps should be inaccordance with 3.4.1.3. 3.4.2.4 Check the pressure tank and find whether there is water discharged from the inflation port. It is necessary to confirm whether theair bag is damaged.The air bag confirmation method is as follows:

① Drain the water and gas in the pressure tank,check whether the fixing screws of the flange cover on the pressure tank are loose,and tighten them immediately if they are loose; ② Use the air compressor to inflate the pressure tank.If gas is discharged from the inlet of the pressure tank,it is judged that the air bag is damaged and theairbag needs to be replaced. 3.4.2.5 Before dismantling pressure-bearing parts such as pressure gauges,flanges orair valves, be sure to drain the water and airin the pressure tank,otherwise personal injuryand property damage may be caused.

Remarks:Diffrent brands of pressure tanks may have special requirements.Be sure to read the instructions provided by the pressure tank carefully before use.

3.4.3During regular inspections,open thecapof thesecondary protection deviceabove the regulat

ingtank to check whether the secondary float alarm device is functioning,to prevent the secondary floatalarmdevice fromfailing toissueanalarmafter theprimary float isdamaged,resulting inThe floating ball cannotbe replaced in time elephant.

3.4 Check the operating environment of the equipment

(1) Whether the ventilation of the equipment operating environment is normal;
(2)Whether the temperature and humidity of the equipment operating environment are normal;
(3) Whether the appearance of the equipment is clean;
(4)Whether the operation of the equipment is authorized and effectively controlled.

4After-salesServiceGuide

(1) Please provide the product model and product number when the product is under warranty,see
the equipment nameplate fordetails; (2)When the equipment is inan emergencyand abnormal situation,please contact the after-sales
servicedepartmentafter the power iscut off in time; (3)The detailed address of the equipment and the telephone number of the repairer shallbe provid
ed; (4) Headquarters common repair telephone:021-67679390\*220

SHANGHAI SINO-KOREA DOOCHPUMPMFG CO., LTD.

Add: No.239 Zhang LianTang Road,Liantang IndustrialPark,Qingpu District,Shanghai,China Tel:+86.21.67679390 Fax:+86.21.67679396

www.doochpump.com.cn