We have some small (around 1KW) 3-phase VSDs with residual current devices on the inputs, and the RCDs are tripping intermittently. We don't believe there really is earth leakage, the equipment is new and reputable, and the problem occurs across several devices. Is this a situation that's known to result in spurious trips, I can envisage that high harmonic content in the input waveform could cause it. Has anyone encountered this problem and solved it?
- posted
11 years ago