Reply by EEngineer

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1083 posts in 3187 days

#1 posted 02-27-2012 11:41 AM

Posting this here too in case it might help someone else…

The link you provided to Ebay shows the VFD, correct? The wiring looks fairly simple. Let’s verify the basics:
1. 2-phase input: You should have 3 wires for 220VAC from a standard home connection: black should go to any one of R,S,T on the VFD; white should go to any other one of R,S,T on the VFD (obviously NOT the same one you connected black to!); green should go to E on the VFD. If you have different colors on the 220VAC connections (commonly Red, white , black OR red, white, black, green OR Black, Black, white, green), then the white is neutral and should be connected to E with green, the other two should be connected to ant two of R,S,T.
2. Motor connection: you should only have 3 wires to the motor. Color coding varies motor to motor. These should connect to U,V,W on the VFD.
3. Verify your motor wiring. The picture of your motor shows the correct wiring for LOW VOLTAGE (208-230VAC) and HIGH VOLTAGE (480 VAC). You must be running LOW VOLTAGE. You will have to remove the plate at the end of the motor and verify that the terminals are wired as shown for LOW VOLTAGE.

I suspect that your first problem is the motor wiring. Since the VFD seems to be ramping up the frequency (that display count you see going from 20 to 59.XX is the frequency it is feeding to the motor for a slow start), it looks like the VFD is operating correctly. The fact that the motor doesn’t turn at all may indicate that the motor is wired for 480 and you aren’t providing enough voltage to get it turning. The VFD is probably faulting on overcurrent.

Check the VFD and motor wiring and let me know. We’ll go from there…

-- "Find out what you cannot do and then go do it!"

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