I've spent the last 3 days collecting PQ data on a AB 7000 drive. 17th & 19th & 35th & 37th & 53rd & 55th harmonics all way above limits. The control is intermittently stopping/faulting and shutting down the drive. I don't have enough experience with these drives to begin to troubleshoot. Any...
I'm troubleshooting a late 50's generation delta connected 2400Vac engine blower motor. I recorded FLA of Aph=23 Bph=41 Cph=41. I thought the megger tests would indicate an insulation problem but all results were 3.5G ohm-4.1G ohm. PI is 1.1.
The motor is direct coupled to the generator...
I need some recommendations regarding high side voltage imbalance. The system is a 2.5MW 2400 delta gen feeding a delta/wye 2400/12,470 GSU. The neutral is floating on the highside wye. I have 15% ph-N voltage imbalance when running the generator isolated. I was called to the customers site to...
Who can tell my why we were seeing 5.0% ratio errors on new ABB SCV CT's with load cables connected? When we disconnected the cables the error was 0.1%. BTW the test set is a Vanguard EZCT.
One of my customers has recently suffered a rash of AB 480Vac freq drive failures. I've been collecting PQ data on the MCC Main. No anomalies captured to this point. Some of these drives have been in service for a numbers of years without failure.
The drives have been on the recieving end of...
