VFD problem....
VFD problem....
(OP)
I have a VFD, when we hook a motor to it the shaft just rocks back and forth; when the same motor is hooked up to the drive next to it it works fine... Why are the motor shafts just rocking back and forth on this drive and not running? I have tested the the diodes and transistors as well as the capacitors in the unit, where else do I need to look/test?





RE: VFD problem....
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
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RE: VFD problem....
RE: VFD problem....
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: VFD problem....
RE: VFD problem....
RE: VFD problem....
RE: VFD problem....
RE: VFD problem....
The 505, as advanced as it was for its day, was not a vector drive. It was a very good, but very simple (by todays standards) V/Hz drive. There was no motor ID run to perform, heck it didn't even care if a motor was connected at all!
The shaking back and forth is indicative of a high DC content in the output wave form, meaning either one (or more) of the transistors is shorted or they are not being fired at the right time (or some not at all). If a transistor was shorted the display would be telling you that and/or a fuse would be clearing. So that leaves a mis-fire. This is a 15 year old drive and it's time to fix it or scrap it, this isn't a matter of programming.
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: VFD problem....
RE: VFD problem....
RE: VFD problem....
Keith Cress
kcress - http://www.flaminsystems.com
RE: VFD problem....
did you try a factory reset on the drive? if in doubt and not sure what has been set, then this is often a way to get back to the start and run the motor with the basic drive settings. If this works, then it is likely a parameter incorrect (as DickDV indicates). If not, then it is kaput and as jreaf suggest, don't bother try to get it repaired if its 15yrs old.