Q:

Can you perform a continuity test on a 3 phase motor?

A:

It is possible to perform a continuity test on a 3 phase motor, although it is slightly more labor intensive than for a single-phase motor. For the 3 phase motor a person needs to check both the phase to ground and each phase to phase aspect using a continuity tester, a multimeter or a megger.

Performing a continuity test on a 3 phase motor has 3 steps:

  1. Begin by connecting a cable and measure across the cable ends using a tool of choice.
  2. Perform a phase to ground test by locating the ground screw on the motor. This should typically be a green hex head screw.
  3. If the ground test shows a proper ohm resistance, then test each phase of the motor in the following order: Phase 1 to Phase 2; Phase 1 to Phase 3; Phase 2 to Phase 3.

Each phase winding should be the same length, meaning that there should be limited discrepancy between the measurements of each phase. They should all be in the high Megaohm range with only approximately 5 percent difference. If there is significant change between any of the phases, then there is an issue with the wiring of the motor that needs to be addressed before it is used.


Is this answer helpful?

Similar Questions

  • Q:

    How do you test a single-phase motor?

    A:

    To test a single-phase motor, first remove the cover of the motor’s wire, and disconnect the wires. Test the lead using the volt-ohm tester followed by a capacitor. Protect yourself from electric shocks by wearing safety gear. Ensure you have a pair of gloves and safety glasses because the voltage of a single-phase motor is always high. Finally, you can switch on the tester and read the volts.

    Full Answer >
    Filed Under:
  • Q:

    Where can you find a replacement motor for a Workforce THD 850 tile saw?

    A:

    Chervon Power Tools sells motors and other replacement parts for the THD 850 Tile Saw. Workforce tile saws come with a one-year warranty; Chervon replaces defective motors without charge if the saw is under warranty.

    Full Answer >
    Filed Under:
  • Q:

    How does one test a starter on a riding lawn mower?

    A:

    The best way to test a riding lawn mower starter is to use an ohm meter. This device determines the continuity of electrical currents in circuits attached to motors, cables and fuses. An infinity or OL reading means the starter circuit is bad.

    Full Answer >
    Filed Under:
  • Q:

    How do you wire a three-phase motor?

    A:

    Wiring a three-phase motor begins with turning off the circuit that supplies power to the motor. Open the motor wiring box, and check for a nameplate with the wiring information. Connect all of the wiring with the right size, and number that coordinate with the conductors you want to use. You can either use the Wye wiring or Delta wiring for a three-phase motor.

    Full Answer >
    Filed Under:

Explore