AC drive giving unbalance voltage output

S

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self

we have a ac reliance drive of 15kw which gives unbalance output in one phase (R 170, Y 300, B 300). when motor is isolated from the circuit, then also it give unbalance voltage. what may be the reason for that unbalance voltage.?
 
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Self… the values you cited indicate very severe unbalance!

Based on both NEMA and IEC Standards, the VUF (Voltage Unbalance Factor) is about 32%.

Since the values are the same whether or not the motor is connected then the Reliance drive is suspect!

Regards, Phil Corso ([email protected])
 
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