If a fault signal suddenly occurs in the running motor, and the ammeter indicates zero, the indicator signal shows that the switch trips and the motor stops rotating, indicating that the motor has automatically tripped. What should I do with this time? Do not panic, Dalan Motor to give you a detailed description of the Y series three-phase asynchronous motor start tripping method.
First check whether the motor insulation is normal, check motor winding with 500V (Megger), 0.5Mohm and above is qualified; no problem with motor, less than 0.5Mohm greater than 0.2Mohm, insulation is not qualified, but not yet Leakage current; 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 shows the motor has been grounded or short circuit, need to continue to check to find the cause.
If there is no shaking table, then connect a live wire into the motor coil, measure the shell with the electric pen, and the same as the fire wire shows that the motor has been grounded or short circuit, you need to continue to check to find the cause; using a pen to measure the shell, although there is no live line, but there is obvious Brightness indicates that the motor is leaking and the insulation is not qualified. It is necessary to continue checking to find the cause. The case is measured with the electric pen, and it is not bright or only slightly bright, indicating that there is no problem with the insulation of the motor.
If the motor insulation is qualified, the power supply may have a missing phase, the power supply voltage may be unbalanced (the difference may be too large), the motor or the motor cable may be broken, and the contact may be poor. Therefore, troubleshooting is required.
Check whether the motor is leaking. If there is no meter, a simple method is to insulate the motor from the earth, and then connect a live wire to the winding. Use a digital test pencil to test whether the chassis has voltage, leakage, or leakage. Short circuit between turns will not cause the leakage switch to trip, it will only lead to unbalanced three-phase current. Short circuit between phases will cause the leakage switch to trip. When the motor trips during operation, it is often not a problem with the equipment. It is a problem with the power supply. It does not exclude protection and personnel misoperation. The following actions should be taken:
(1) Start the standby equipment immediately and put it into operation. The important motors 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 loop.
(3) Check whether the motor protection is active or not. 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 smoke, short circuit and damage.
(5) Check if the power supply is normal.
(6) Check whether the mechanical part is normal and whether the motor bearing is damaged and hold the large shaft.
(7) Did anyone misunderstand the protection or accident button?
----- Editor: Dalan Oil Pump Motor 02 - Procurement Consultant
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