![]() You should detect a small AC voltage which will increase with speed. ![]() Giving the drum a spin (in such a way that you don't leave bits of finger behind in the mechanism !) might make it spring into life - that too would be an indication of a missing phase (if the load is light enough, it'll run on single phase, but not start).ĮDIT: Also, with the power off, unplug the motor and check across the wire wires (of the motor) while you spin the drum. Does the motor hum at all ? If it does, then that would indicate power getting to it. The lights should be equal in brightness - if (for example) one phase was dead then you'd see two lights dimmer than the third.Īlso, don't forget the test features built into most humans. That's about all you can do with a multimeter, unless it has a frequency measurement option in which case you could also check that.Īnother simple test would be to unplug the motor and connect three equal light bulbs (in delta) across the phases. Then check phase-neutral (that's supply neutral) which should also be equal and non-zero. ![]() Set on AC VOLTS, test across the 3 combinations of phases (ie 1-2, 2-3, and 3-1) which should all be the same and non-zero. The two white wires will be from a tacho used for speed feedback to the controls. ![]() The 3 phase will come from a small inverter (variable frequency) on the control board. ![]()
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