Powerflex 70 VFD error Help
- Thread starter danester
- Start date
OkiePC
Lifetime Supporting Member
What are your voltage readings leg to leg at the drive input terminals? What type of 3 phase power distribution supplies this drive?
sthompson
Lifetime Supporting Member + Moderator
There are a few possibilities.
If you have a number of VFDs fed off the same supply, it could be Harmonics causing the problem. Do you have Line Reactors in front of the VFDs?
An intermittent bad connection somewhere in the supply lines, that perhaps only shows up under Current Load.
Very, very rarely I have seen a Sensor fail in the VFD. If everything is good on the incoming lines, then your only choice will be to change it, and send the faulty one in for repair.
Stu....
I do have line reactors in front of all VFD's in the cabinet, I checked Phases on the faulty VFD line reactor and all OK.
I think I swapped a drive out a couple of years ago for the same problem and all was OK afterward.
I hate swapping these out!!!!! Hard to get at wires and a lot of them.I;d Rather be golfing today, but someone has to bring home the bacon.
Danester
I think I swapped a drive out a couple of years ago for the same problem and all was OK afterward.
I hate swapping these out!!!!! Hard to get at wires and a lot of them.I;d Rather be golfing today, but someone has to bring home the bacon.
Danester
DickDV
Member
Drive may have deteriorating capacitors causing excess ripple on the DC bus. That's usually the way single phasing is detected.
Ken Roach
Lifetime Supporting Member + Moderator
What are the full load ampere ratings of the drive and the motor ?
An undersized drive will sometimes detect an imbalance fault because it can't keep the bus charged without a high percentage of DC ripple. The fault is less common with the PowerFlex 70's (they are in general more over-built than some other A-B platforms) but the principle is the same.
An undersized drive will sometimes detect an imbalance fault because it can't keep the bus charged without a high percentage of DC ripple. The fault is less common with the PowerFlex 70's (they are in general more over-built than some other A-B platforms) but the principle is the same.
I ran into this problem a year or so ago with a PowerFlex 700. This drive had an input line reactor and output filter as well. I tested power quality with a Fluke 1735 Three-Phase
Power Quality Logger. I could not find any problems. There is a parameter you can use to disable the Input Phase Loss Fault. I disabled it on my drive and it has been working for over a year with no problems.
Power Quality Logger. I could not find any problems. There is a parameter you can use to disable the Input Phase Loss Fault. I disabled it on my drive and it has been working for over a year with no problems.
Similar Topics
Looking for some assistance. I am very familiar with Yaskawa VFDs, but not so much with AB VFDs. I am working on some hardwired AB PowerFlex 700...
Hello all! I am fairly new to the world of PLC's and this forum, so I apologize for my lack of knowledge. I have a Powerflex 753 that keeps...
Hello all,
It's been a while but have an odd request.
Have a customer that has a AB SLC5/05 with a SDN module. On the network are several...
Less concerned about the specifics of the powerflex, more curious if a circuit had a disconnect on a motor that was separate of the VFD, is there...
Greetings all!
I am considering the use of a PowerFlex 525 VFD for a 3-phase 1 HP fan motor for an equipment skid that will be shipped to France...