How do you test a DC motor megger?
Connect one lead of the DC motor to the megger probe and the other lead from the megger to the frame or metal case of the DC motor. Press the power button on the megger or turn the hand crank. The battery unit will take a few seconds to analyze the voltage travel and soon a reading should appear on the LCD screen.
How do you test the insulation resistance of a DC motor?
This is how the test works: DC voltage of 500 or 1000 V is applied between the windings and the ground of the motor….A general rule-of-thumb is 10 Megohm or more.
| Insulation resistance value | Insulation level |
|---|---|
| 2-5 Megohm | Critical |
| 5-10 Megohm | Abnormal |
| 10-50 Megohm | Good |
| 50-100 Megohm | Very good |
How do you test a DC motor?
Check to make sure the DC motor’s rotor can turn with no impediments. Switch the voltmeter to “Ohms”. Attach one end of the red lead wires to the DC motor and run the DC motor’s red wire to the battery. Attach the clip of the black lead wire to the DC motor and run the black motor wire to the battery.
What is pi test of motor?
Polarization index (PI) testing is an extension of the insulation resistance test and is designed to check specific issues in a motor such as moisture and insulation deterioration.
How do you test a 3 phase motor?
Using a multimeter, check the continuity of motor winding from phase to phase ( U to V, V to W , W to U ). Each phase to phase must have a continuity if winding is OK. If any particular phase fails the continuity test, your motor is probably burnt.
How do you test a 12 volt DC motor with a multimeter?
How to measure dc voltage with a digital multimeter
- Then insert the red probes into the V Ω jack. When finished, remove the probes in reverse order: red first, then black.
- Connect the test probes to the circuit: black to the negative polarity test point (circuit ground), red to positive test point.
How do you test a 3 phase motor insulation resistance?
Phase Resistance: Take the insulation tester and set it to 500V. Take each end and place it on different permutations of L1, L2 and L3 and record each reading. Phase to Earth Resistance: Take the insulation tester, using the same setting, and check each lead from phase to the frame of the motor.
How to test a 3 phase motor with a Megger?
Turn off the main circuit breaker to cut the power supply to the circuit you are testing.
What is the acceptable limit of a Megger test?
The general rule of thumb that is used for acceptable values for safe energisation is 1 MΩ per 1000 V of applied test voltage plus 1 MΩ. Megger Test Safety Precautions While using a megger test, you could be injured or damage equipment you are working on if the following MINIMUM safety precautions are not observed.
How to check motor with Megger?
Flathead Screwdriver
What type of voltage applied during Megger test?
For electrical systems whose voltage is high,it requires 1000V to 5000V for testing.