mutabi

Hey guys, We use a lot of AB 600's in our plant. We usually end up changing a drive, once a month. Sometimes it is quite difficult to decide if the problem is the 600, or the motor.

Anyone have any tips for the 600's?

What is the difference between an overcurrent fault, and a stall fault?

We tend to get a lot of overcurrent faults on these drives. While the drive is running, it will show on the HIM that the current is within motor specs yet it will still fault out. Right now for example, on a fairly new installation of a 600, and a 30HP motor, it will fault out on overcurrent maybe a couple of times a day. Might take a few resets before it starts running again. After that it starts running fine again.
For me, its hard to diagnose that as a bad motor, or drive. Megging the motor shows it to be good. Flaky drive, or a load issue?

p_logix

Sounds like a load issue to me.

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p_logix
"Meggers Don't Lie, Electricians Lie". Go LAKERS!!!!

MDShunk

If you have a power quality analyzer, or any instrument that will record voltage and current in real time, ..... next time the drive alarms out, put on the PQA and try to restart the drive. If it fails to restart, examine the graphs on the recording instrument to see if the drive was lying to you or if you really do have a crazy current spike for an extended period.

What's being driven, anyhow? Any chance of things like gearbox failures, something jammed, etc.?

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