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- How to check 3 phase motor winding with multimeter how to#
- How to check 3 phase motor winding with multimeter manual#
A high measurement indicates the motor has an open winding. The readings should be about 10-14% of the following values:Ī low measurement indicates the motor has a shorted winding. Also a polarization test may identify moisture in the windings. For this you would need a 500 V Megger (brand name). A multimeter may identify the problem but it may not have enough voltage to measure a winding fault to ground. I suspect you have a dead motor in front of you. This gives you the true resistance measurement. It would help if we knew why you wanted to check a 3-phase motor winding. (2) Insulation damage caused by wire insertion. (1) The long-term overload of the motor causes aging of the insulation.
How to check 3 phase motor winding with multimeter how to#
If you do not know how to zero your meter, take note of the resistance measured when the two leads are touched together and subtract that from the actual measurement. Reasons for Short Circuit Faults of Motor Windings.
How to check 3 phase motor winding with multimeter manual#
IMPORTANT: Set the multimeter to the ohm scale and zero it out by touching the two leads together and pressing the appropriate button to zero your meter (see your meter instruction manual on how to do this). Check the readings on your multimeter If your motor is good, it will have little resistance i.e.0 or close to zero. Take the other probe and touch it to the other terminal on the motor. Take one of your multimeter probes and touch it to one terminal on the motor. A single-phase circuit will have a 1-pole. First, set your multimeter to the lowest setting, or RX1.Setting. Look at the width and the number of poles which are the individual circuits that the switch controls. Find the main switchboard in your fuse box, which is the largest fuse usually located directly in the center of the box. Each motor, regardless of the connector, can be measured this way. Identify a single-phase power supply by a single pole. These can be used to measure the resistance.
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At the connector, you can see tabs where the pins are (see Figure 2 and Figure 3). Starting from either side, the first two wires are one phase and the remaining two wires are the second phase. To measure the resistance, disconnect the motor at the connectors (see Figure 1). Check the motors schematic or its motor winding diagram and use the multimeter to measure the resistance of each winding leg. Resistance in the stepper motors is measured on the two phases. Next, set the multimeter to midrange and configure it to measure resistance in ohms, then touch the leads together to verify that the reading is 0 ohms. Stepper Motor Resistance Test Stepper Motor Resistance Test