gene heskett wrote: > > However, if the problem is related to the spikes on the line caused by slow > recovery characteristics of the diodes in this kits high voltage DC supply, > those spikes will be attenuated by the poor high frequency response of the > transformers. They won't look as if they are big enough to be a problem so > most would ignore them. > Well, this is possible. the generated phase has a much higher impedance than the supplied single-phase mains. If this IS the problem, a few big caps of the phase correction sort across all the L-L terminals might absorb enough of this to keep the protection circuits from tripping. But, of course, the presumably modest Diesel generator would also have a somewhat higher impedance, and the drive ran fine on that. So, I'm still thinking this is more likely to be a simple phase imbalance problem than a spike problem. But, without knowing what sort of input protection gear this system has, it is impossible to know. On the other hand, if the input module uses SCR phase-angle regulation, then phase imbalances would cause a HUGE problem as they screw up the commutation angles of the SCRs, and could easily overvolt the DC bus.
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