My VFD is having a stroke? (PM1440GT)

Dabbler said:
To avoid $$$ it is worth a try to demount and check inside. Redoing all your connections would also be wise.
Click to expand...

It's certainly still under warranty as it's only 6 months old... but I'm afraid I'll have to wait for a motor to arrive on a slow boat from Taiwan.
I'll pull it apart in the morning and see if something obvious is going on .
 
Maybe remove the motor and get an estimate from a motor repair shop.
 
LVLAaron said:
It's certainly still under warranty as it's only 6 months old... but I'm afraid I'll have to wait for a motor to arrive on a slow boat from Taiwan.
I'll pull it apart in the morning and see if something obvious is going on .
Click to expand...
Still, you should call PM and get the replacement under warranty... even if you decide to get a different motor, you will still have a working backup motor...
 
Ebay has a listing for that short length marathon blue max motor for $300. If I had that lathe I'd jump on it as an extra. Dave
 
My bad. Thought this was the one i had seen a few months ago. Should have looked. Dave
 


I'm definitely not a motor expert, so don't judge me here... I was testing (U1 to V1,V1 to W1 ,W1 to U1) and getting different results from last night.
It's very sporadic, Sometimes, I'd get continuity every 120 degree rotation of the shaft (i dont know if that's normal? I dont think so!?) and sometimes nothing at all.

Anyway, called PM and shared this thread with them. Sounds like they have a motor.
 
Continuity should not change with motor rotation, so most likely one of the windings is bad and it appears intermittent. It is not worth rewinding the stock motor given the costs these days. I would speak to PM/QMT first and then decide what your options are after that. There are a couple of Marathon Y541A listed on eBay that are the same as Jake P used, but requires a new motor mount and a number of other modifications to the cabinet and belt cover. Not a small undertaking and may need some welding to incorporate the hinge. The E470 you would need to shop around for pricing, but they are up ~25% from about a year ago. The "Y541A" is probably a better motor, but both require a lot of work to get them to fit.

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1440GT Upgrades and Additions

Part One, VFD Conversion: As some of you may remember I had a 1340GT on order for many months and ended up finding a deal on a used 1440GT just before my 1340 was to be delivered. The thread with that story is here: https://www.hobby-machinist.com/threads/my-1340gt-story.95922/ Since...
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