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The wiring diagram inside the connection cover appears to show a capacitor-start motor with a centrifugal switch, but there is no obvious switch. It would be reasonable to assume some of the internal wiring is to a switch, but the connections shown are open circuit. Furthermore, if they were to a switch, it would turn the motor off once it got to speed. | The wiring diagram inside the connection cover appears to show a capacitor-start motor with a centrifugal switch, but there is no obvious switch. It would be reasonable to assume some of the internal wiring is to a switch, but the connections shown are open circuit. Furthermore, if they were to a switch, it would turn the motor off once it got to speed. | ||
I'm guessing | I'm guessing that it's not a centrifugal switch, but a thermal fuse. So the mains input is actually on Z2/U1 as shown on Tec's data sheet, but goes via V1/V2 to match the cover diagram. The fuse has blown for reasons unknown. | ||
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Things we've checked : | Things we've checked : | ||
Looking at the motor connections on the cover diagram, it's apparent that mains power must flow into V1 for any effect at all. But this connection has a high resistance to all other pins. It's either a burnt out winding, | Looking at the motor connections on the cover diagram, it's apparent that mains power must flow into V1 for any effect at all. But this connection has a high resistance to all other pins. It's either a burnt out winding, or possibly a thermal fuse. | ||
The capacitor appears to be fine | The capacitor appears to be fine | ||
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There is a [http://www.tecmotors.co.uk/sites/default/files/WIRING%20DIAGRAMS.pdf | There is a [http://www.tecmotors.co.uk/sites/default/files/WIRING%20DIAGRAMS.pdf | ||
wiring diagram ]on the Tec website for capacitor-run motors which does not use the unconnected V1 pin. Perhaps this is the correct wiring ? But then how did the motor ever work ? | wiring diagram ] on the Tec website for capacitor-run motors which does not use the unconnected V1 pin. Perhaps this is the correct wiring ? But then how did the motor ever work ? |