![]() Solutions:Ĭheck whether the frequency inverter ground wire is contaminated whether the control board to the power board UI, VI current feedback signal is consistent use a clamp ammeter to detect whether the field load is too large use a megohmmeter to detect whether the insulation between the motor windings is damaged use a multimeter to detect whether the coil is shorted to ground or not Analysis: The frequency inverter current detection chip is disturbed by the grounding cable, causing the frequency inverter to falsely report over-current fault. The AC70E reports the OC1 or OC3 fault when starting and running, and if you remove output line, same problem happens and the field device cannot continue to run. OC1 or OC3 is reported in the AC70E frequency inverter.
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