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If the running motor suddenly has a fault signal, and the ammeter indicates zero, the indicator signal indicates that the switch has tripped and the motor stops rotating, indicating that the motor has automatically tripped. What should I do at this time? Don't panic, Dalan Motor will give you a detailed description of the tripping method for the Y series three-phase asynchronous motor.
First check whether the motor insulation is normal, check the motor winding with 500V shake meter (Megohmmeter), 0.5 megaohms and above is qualified; the motor has no problem, less than 0.5 megaohms is greater than 0.2 megaohms, the insulation is unqualified, but not yet Leakage; less than 0.2 megohms is not zero, the motor has been short-circuited or there is leakage, need to continue to check to find the cause; zero insulation indicates that the motor has been grounded or short-circuited, need to continue to check to find the cause.
If there is no shake table, take a fire wire into the motor coil, measure the outer casing with an electric pen, and the light is as bright as the live wire, indicating that the motor has been grounded or short-circuited. It is necessary to continue checking to find the cause; use the electric pen to measure the outer casing, although there is no fire line, but it is obvious Brightness, indicating that the motor has leakage, insulation is unqualified, need to continue to check to find the reason; use the electric pen to measure the casing, not bright or only weak, indicating that the motor insulation is no problem.
If the motor is qualified, it may be that the power supply has a phase loss, the power supply voltage is unbalanced (the difference is too large), the motor or the motor cable is disconnected, and the contact is poor.
Check whether the motor is leaking. If there is no instrument, the simple method is to insulate the motor from the ground, then connect the winding to a live wire, and use a digital test pencil to test whether the casing has voltage, leakage or leakage. A short circuit between turns will not trip the leakage switch and will only cause a three-phase current imbalance. A phase-to-phase short circuit can cause the leakage switch to trip. Tripping during motor operation is often not a problem with the equipment, or there is a problem with the power supply, and the protection and personnel misoperation are not excluded. The following processing should be carried out:
(1) Immediately start the standby equipment and put it into operation. The important motor without spare equipment can be sent once. Minimize the loss and impact of motor trips on production.
(2) Measure the insulation resistance of the motor and its circuit.
(3) Check whether the motor protection is working. For low-voltage motors, check whether the circuit breaker, fuse, and thermal relay are normal.
(4) Check the motor and its circuit for signs of smokeless fire, short circuit and damage.
(5) Check if the power supply is normal.
(6) Check if the mechanical part is normal, and if the motor bearing is damaged, hold the large shaft.
(7) Whether someone has misplaced the protection or accident button.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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