Abb acs550 earth fault even when not in run.

g.mccormick · Aug 24, 2018

Hey all. I tried to startup a drive last thing before leaving for the weekend. On power up, the drive constantly gies earth fault. This is with the drive in stop mode, not even trying to go into run yet. This was a used drive we had on the shelf. Im sorta guessing this is bad.

TWS · Aug 24, 2018

Disconnect the motor leads and see if it still faults out.

g.mccormick · Aug 24, 2018

I opened the downstream disconnect and it still did. I will disconnect leads entirely on monday

jraef · Aug 24, 2018

A damaged IGBT will do that, current it leaking into the heat sink. How big is the drive? Small ones are not worth fixing.

g.mccormick · Aug 24, 2018

jraef said:
A damaged IGBT will do that, current it leaking into the heat sink. How big is the drive? Small ones are not worth fixing.

Thats sorta what i was thinking. Its a 5hp drive.

jraef · Aug 24, 2018

It's a door stop now...

Gene Bond · Aug 26, 2018

I've also seen bad current transducers do similar, stupid things. The ground current is sometimes calculated by the difference between the 3 outputs. Something like. 'If it the current went through there and there, but not there, then it must have gone to ground'.

Luckily, a 5hp drive costs less than a good dinner-date these days!

g.mccormick · Aug 27, 2018

Well I disconnected the load leads at the drive this morning and powered up, the fault was gone. Luckily!

We found a pinched/grounded wire about 1foot from the drive in a LB cover.

Wire fixed, drive and pump running.

Thanks for the help all.

g.mccormick · Aug 27, 2018

Whoops double post

Abb acs550 earth fault even when not in run.

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