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Repair options on a Electromotive VFD (Crane Rated)

We just completed an overhaul of several large cranes and brought a couple back to life. One of these had a dead Electromotive Impulse G+ 7.5hp 480 drive on the trolley, which was replaced.

I've done a little searching and found many outfits that do repairs on these drives, but I'm wondering if they're worth bringing back to life.

Here's what apparently killed it:

There was no line side fusing to the drive, and the main disconnect at the crane had a burned fuse clip on one phase. The crane apparently ran OK until the C phase main fuse blew. We repaired the disconnect. The Bridge and Hoist drives appear to be OK. The poor Impulse had several large ceramic caps laying in the bottom of the wiring compartment. No control power, no displays, nothing.

I know from the caps that at least part of the power section is toast.... SCR's, caps, etc. Who knows what this did to the logic boards. If it was the power section only, we might attempt repair ourselves.

Anybody had any experience with these drives or repair depots that service them?

Thanks,

Jake

Reply to
Jake
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Jake, I haven't heard of Electromotive, but if they are as old as I think they are you might be better off replacing them entirely - for two main reasons:

  1. The end result will be cheaper and more reliable than repairing the toast (who knows what else got fried).
  2. You'll get future repair/warranty support.

The drive you mention is pretty small and should be fairly easy to replace. If you decide to replace them, I suggest you stick to manufacturers that specialise in crane drive applications - I would start with ABB's "DTC" drives, then Allen-Bradley and then Siemens "Masterdrives".

Cameron:-)

Reply to
Cameron Dorrough

I neglected to mention that the drive has already been replaced with an Electromotive G-3 series. I think the price was around $1,100 bucks. The dead one would just be used as a spare... I just hate to throw this stuff away.

Thanks for the replies so far....

Jake

Reply to
Jake

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