How to Use a Multimeter to Test the Health of a Three-Phase Motor
Three phase motors are common motors in industry, and measuring the quality of three-phase motors can be done through various methods. One common method is to use a multimeter to measure current and voltage.
1. Measure current
Measuring the current of a three-phase motor is one of the important indicators for judging its quality. The operation steps are as follows:
a. Adjust the measurement mode of the multimeter to alternating current (AC A) measurement mode.
b. Select the current range and choose the appropriate range based on the rated current of the motor.
c. Connect the test leads of the multimeter to the three output terminals of the three-phase motor according to the wiring diagram to ensure correct wiring.
d. Turn on the three-phase motor and read the current value. If the current value is close to the rated current, it indicates that the motor is normal.
2. Measure voltage
Measuring the voltage of a three-phase motor is also an important indicator for judging its quality. The operation steps are as follows:
a. Adjust the measurement mode of the multimeter to AC voltage (AC V) measurement mode.
b. Select the voltage range and choose the appropriate range based on the operating voltage of the circuit where the motor is located.
c. Connect the test leads of the multimeter to the three input terminals of the three-phase motor according to the wiring diagram to ensure correct wiring.
d. Open the circuit and read the voltage value. If the voltage value is close to the operating voltage, it indicates that the motor is normal.
In addition to measuring current and voltage, the quality of three-phase motors can also be determined by measuring resistance, insulation resistance, and performance testing. But the specific implementation of these testing methods needs to be determined based on the specific situation and equipment requirements. In short, using a multimeter for current and voltage measurement is one of the relatively simple and commonly used methods.
