7/23/2019 11:11 AM | |
Posts: 2 Rating: (0) |
Dear All. I have a problem regarding this alarm. I using 2 sets of Sinamics inverter G120 PM240 200kw with CU 250s-2. each one is running a 160kw FLYGT pump. 1. During operation, pump 1 stopped and alarm f30021 occurs in inverter 1. 2. we have check all connection in motor, junction terminal, power cable to the inverter, and Inverter. we didn't find any short circuit. 3. We try to exchange between the pump 1 and 2. it can run but only 1 hour and alarm again. we try to run again but it instantly alarms. 4. we have tried both pumps separately in inverter 2 and can run well. 5. we have tried both pumps separately in inverter 1 and instantly alarm 6. so we conclude that the problem is in inverter 1. 7. I disconnected all pumps from the inverter. then I switch on the panel and try to run without load. no alarm comes for more than 30 minutes, then I press the emergency button. after that, I found differences between the inverter. Inverter 1 was an error reading in dc-link voltage. Inverter contactor -20k1 that supplies the power for inverter hasn't on yet, but the dc-link voltage reading was 622,8 volt. This is not right. 8. I try to restart the power and let the inverter off (emergency relay on) the same thing happened ( Dc link Voltage 622 Volt in Inverter 1). 9. Even when I disconnected the incoming power input cable for the inverter, the dc-link voltage remains the same at 622 volts. while I check manually in the DC terminal with a voltmeter, it was about 18 volt in off mode and 560 volts in standby mode (contactor On). I think this is why Ground Fault alarm f30021 alarm comes because it is related to dc-link current. 10. I have check all parameters are the same as given by the technician. Please help us to solve this problem. Thank You 10 ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 07/23/2019 13:29:30New subject after splitting |
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