How would I go about identifying unmarked leads on a 9 lead motor ? I also need to establish wheather this is wires delta or Y.

  • \$\begingroup\$ Large motor? Any idea on the kW rating and any other nameplate information? \$\endgroup\$ – Joshyp00 Nov 14 '16 at 18:21

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You would need to measure the continuity of each winding with a digital multimeter or similar device. Doing a quick google search found this schematic. It should become fairly obvious whether it is in star or delta once you start taking the measurements as there can only be a certain pattern of readings - providing the windings are in sound condition.

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    \$\begingroup\$ Conceivably it could be an 8 way connection (e.g. a 4 coil stepper) with an earth. \$\endgroup\$ – abligh Nov 14 '16 at 9:12
  • \$\begingroup\$ If there are just 9 unmarked leads, and it is a three phase AC motor, you will also need to determine the phasing of each winding before attempting to connect it. \$\endgroup\$ – R Drast Nov 14 '16 at 12:12

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