3520b inverter

[andrew postlewaite]

I have a Powermatic 3520b and the inverter has failed - the machine stalls with even mild load. PM says that the original inverter is obsolete and that they don't have a replacement. Anyone have an idea where I can get a replacement?

Thanks
Andy

 

[Richard Coers]

Scroll down a little Andy, this is a very popular subject right now. If the motor is running, you must have a different problem. When a VFD fails, the motor will not run at all. Check for set screws and keys missing on the motor and headstock shaft. You probably are spinning a pulley on a shaft. For the future, here is the go to site; https://www.docgreenwoodturner.com/articles.html#Powermatic

 

[Brian Gustin]

Also don't forget the Mustard Monster website , tons of useful info on powermatics there.

 

[Darryl Fective]

Scroll down a little Andy, this is a very popular subject right now. If the motor is running, you must have a different problem. When a VFD fails, the motor will not run at all. Check for set screws and keys missing on the motor and headstock shaft. You probably are spinning a pulley on a shaft. For the future, here is the go to site; https://www.docgreenwoodturner.com/articles.html#Powermatic

My inverter got so it would barely drive the motor with anything but the lightest cuts. It would bog down (not maintain speed) or just stall completely. I'd have to cycle the switch a time or 2, which would work a few times, but then you'd have to unplug and reset the inverter.

I replaced mine with a cheap one from Amazon years ago, and it's been running well since.

 

[Dean Center]

VFDs.com. There are instructions on the forum for installing a LaPond brand vfd, available at Amazon.

But before you descend into this particular rabbit hole, are you sure your belt is snug and not slipping? Or that there is not some other problem causing stalling?

 

[Kevin Jenness]

If you do wind up replacing the inverter, consider putting it in a dust-free enclosure and hooking it up to a moveable magnetic-backed control box.

 

[Steve Lillie]

I just ordered a new inverter from a Delta supplier, but should have gone with Galco, for their tech support. Powermatic will email you the parameters without hesitation. Hopefully, they will be easy enough to input in my new Delta VFD7A5MS21ANSAA inverter for this 3520B .

 

[Rusty Nesmith]

As long as you have the parameters just about any brand VFD will work. I have found Allen-Bradley to be the most user friendly. I used to buy AB for all of my conveyor projects.