When wiring this 220V, 60rpm AC motor to the mains, it turns perfectly with the live and neutral wires connected to terminals 1 and 2 and with the earth wire disconnected from terminal 3, however it does not turn when the earth wire is connected to terminal 3. The seller indicates that the live and neutral wires are to be connected to these terminals, but does not mention the earth wire, or the purpose of the third terminal. How do I resolve this when wiring it to UK mains?
Electrical – How to wire this AC motor to a UK plug
acgroundingmainsmotorwiring
Related Solutions
1) Why would you expect a potential difference not to appear? N and earth are tied together only in distribution/transformer boxes, that's a long way till your house, the N wire is usually carrying some current so its potential might slightly differ from ground.
2) If you call tripping the whole house an issue, well that's an issue then. I'd say that safety is not compromised at all, it is instead enforced by this behaviour. Disconnecting also the N through the circuit breaker would work.
Pictures should help:
As @Asmyldof stated, the motor has no concept of hot or neutral, so the polarity of the AC connections is not important. Connect one of them to hot, and one of them to neutral. The motor will turn the same direction even if you reverse these connections. To reverse the motor, you have to remove the metal jumpers, and reposition them as indicated by the diagram.
Note that you absolutely should ground the motor housing, but this is a protective measure (the yellow/green-stripe wire is the earth/ground connection), but ground is not neutral.
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Best Answer
Connect to terminals 1 and 2 (or 3) as instructed by the product documentation. Carefully connect an earth wire to the motor housing with one of the screws that attach the terminal block to the housing. You could also connect the earth wire using one of the holes in the housing used to mount the motor. If you do that, remove the paint where contact is made.