We received an italian machine with 7 VFDs (40HP)each one equipped with a small 3 phase motor to operate the cooling fan (spec 460 VAC, .29A).After 5 hours of operation the overloads began tripping. Checked amperage (Di-log clamp meter) T1:.41A, T2:.27A, T3:.19A, Supply Voltage:L1-L2 490.2, L2-L3 491.4, L3-L1: 490.1. What could it be the source of unbalance?
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