PU Communication Fault for ACS 880, remove fault VFD by powering down and reset the VFD, what could be the cause?
Dear Flavio,
Just recently our VFD ACS 880 (450 kw) driving a fan stop and the fault indicates PU Board powerfail fault 5692 Aux Code 0000 0001 and PU Communication Fault 5681 Aux code 0000 0003. We have experience this before and what we found out before is one of the fuse for the power module was busted, we just replace the power module with a new one.
This time, because with the same Fault we assume that the power module was again damage but before checking the internal we power down the VFD then power it up and reset the VFD. The fault was gone. We started it and check for all parameters and signals and no problems were detected.
Just today, we have an opportunity stoppage, so we open the VFD to check for any possible problems that could have cause the PU communication fault but we did not see any problem. We started it again and the unit started without any problem.
Could we attribute this to bug in the firmware and we need to update the firmware? Could you provide us an expert opinion on what could have happen, probable cause?
Just recently our VFD ACS 880 (450 kw) driving a fan stop and the fault indicates PU Board powerfail fault 5692 Aux Code 0000 0001 and PU Communication Fault 5681 Aux code 0000 0003. We have experience this before and what we found out before is one of the fuse for the power module was busted, we just replace the power module with a new one.
This time, because with the same Fault we assume that the power module was again damage but before checking the internal we power down the VFD then power it up and reset the VFD. The fault was gone. We started it and check for all parameters and signals and no problems were detected.
Just today, we have an opportunity stoppage, so we open the VFD to check for any possible problems that could have cause the PU communication fault but we did not see any problem. We started it again and the unit started without any problem.
Could we attribute this to bug in the firmware and we need to update the firmware? Could you provide us an expert opinion on what could have happen, probable cause?
Asked 6 months ago
Answers
0
Hi Glenn
although I believe that a FW bug is not responsible for the fault you described, I should still know your FW version.
In any case, it is very difficult for me to associate a cause to the fault you have described, also and precisely because when you then power up the drive again, it seems to work correctly. It could really be a fault with the module you replaced, but you should ask the nearest ABB service for a more effective opinion, which has the tools to make a very precise on-site diagnosis.
I'm sorry I can't help you more
BR
Flavio
although I believe that a FW bug is not responsible for the fault you described, I should still know your FW version.
In any case, it is very difficult for me to associate a cause to the fault you have described, also and precisely because when you then power up the drive again, it seems to work correctly. It could really be a fault with the module you replaced, but you should ask the nearest ABB service for a more effective opinion, which has the tools to make a very precise on-site diagnosis.
I'm sorry I can't help you more
BR
Flavio
0
1. Possible caused for input fuse failure is Inrush Current.
2.This could be due to many reasons.
3.One of the cause is Momentary Voltage Sag.During voltage sag(dip),the energy of the motor is derived from Dc bus capacitor causing it to be depleted faster than normal. Upon restoration of voltage when voltage sag is over,a large inrush current occurs from the AC input side to charge the drive bus capacitors. Depending on the size of the drive this current peak could be 5-20 times the normal peak current of drive. This large inrush of the current can cause the Fuse failure or circuit breaker feeding the drive to trip out.
2.This could be due to many reasons.
3.One of the cause is Momentary Voltage Sag.During voltage sag(dip),the energy of the motor is derived from Dc bus capacitor causing it to be depleted faster than normal. Upon restoration of voltage when voltage sag is over,a large inrush current occurs from the AC input side to charge the drive bus capacitors. Depending on the size of the drive this current peak could be 5-20 times the normal peak current of drive. This large inrush of the current can cause the Fuse failure or circuit breaker feeding the drive to trip out.
Answered 3 months ago
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