VFD problems motor not running?

AI Thread Summary
A customer is experiencing issues with their motor running on a Variable Frequency Drive (VFD) after tampering with the setup parameters, which have since been corrected. The motor is operational but unbalanced, with phase measurements showing 300 VAC instead of the expected 240 VAC for a three-phase motor rated at 415 volts. The potential causes include an unbalanced output from the VFD or possible motor damage. The discussion emphasizes the importance of using a true RMS voltmeter for accurate voltage measurements, as the VFD alters the waveform. Further assistance is sought to resolve the unbalanced motor issue.
vsdguy
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Hi all,

I am new on the forum. I have a customer who is having some problems with running their motor with the VFD. I realized they had tampered with the setup parameters and luckily we corrected all the parameters. However, they have gained control on the motor, but the motor is unbalanced. The maintenance people are measuring between phases 300 vac instead of 240 vac. It's a three phase motor rated 415 volts at 50 Hz.
I told the customer that either the output from the VFD is not balanced or the motor might be damaged.
What else can I help to solve this problem?
Any help?
 
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