What is the cause of automatic tripping of the motor and how to deal with it

The motor trips are: the power supply voltage is too high or too low, the motor is out of phase, the motor coil is short-circuited, the motor is overloaded, the motor is blocked, etc. will automatically trip, the voltage is too high or too low and the motor is out of phase, as long as the three-phase voltage is measured with a multimeter, the motor is overloaded or plugged as long as the motor current is measured with a clamp meter, and the motor coil is short-circuited as long as the coil is shaken with a shake meter to the ground insulation resistance.

Either there is overcurrent or leakage, starting from these two aspects, check the insulation of each winding to the ground, the insulation between the windings, the DC resistance value of the windings and whether it is balanced.

Check whether the motor is leaking, in the case of no instrument, the simplest is to insulate the motor from the earth, and then connect the winding to a live wire, and use a digital voltage tester to test whether the chassis has voltage, yes, leakage.

If the motor trips during operation, it is often not a problem with the equipment or a problem with the power supply, and it does not rule out the protection and personnel misoperation, and the following treatment should be carried out:

1.Immediately start the standby equipment and put it into operation, and the important motor without the standby equipment can be forced to send it once. Minimize the loss and impact of motor tripping on production.

2.Measure the insulation resistance of the motor and its circuit.

3.Check whether the motor protection is working, and for low-voltage motors, you should also check whether the circuit breaker, fuse, and thermal relay are normal.

4.Inspect the motor and its circuits for signs of fire, short circuit and damage.

5.Check whether the power supply is normal.

6.Check whether the mechanical part is normal, and whether the motor bearing is damaged and holds the large shaft.

7.Whether someone mistakenly touched the protection or accident button.

Hello, it is a pleasure to serve you. There may be several reasons why the motor trips immediately after it is turned on:1

Overload. If the load on the motor exceeds its rated value, the current can increase rapidly, causing the fuse or circuit breaker to blow, thus interrupting the circuit. In this case, the corresponding electrical equipment capacity can be increased or the motor can be replaced.

2.Short circuit. When the motor is running, a short circuit in the wire or component can also cause the fuse or circuit breaker to trip.

Inspect wires and components for problems such as poor contact, insulation damage, etc. 3.Lack of phase.

In this case, one of the three-phase motors is not adequately supplied with power, which usually causes the motor to emit abnormal noise and fail to start the normal operation. It is necessary to check whether the wires of each phase on the power line of the motor are well connected. 4.

Motor failure. If the motor is not maintained for a long time or has a long service life, the parts may be damaged or deteriorated, resulting in the motor not working properly. In this case, the motor needs to be repaired or replaced.

The motor tripping is when the electrical host or line fails, the current changes abruptly, which causes the protection switch to be automatically disconnected. The causes of motor tripping are mainly divided into several categories, such as line short circuit, load overload, and excessive motor current caused by mechanical failure.

Reasons for the treatment of automatic tripping in the operation of the motor:

1) Short circuit between turns or phases of the stator coil.

2) Power cable failure.

3) The mechanical jamming is carried by it.

4) The voltage is too low.

5) Relay protection malfunction or personnel misoperation.

Treatment: 1) If the standby motor is not automatically put in, the switch of the standby motor should be closed quickly.

2) If there is no spare motor, the electrical operation duty personnel should be notified to check, and only after there is no problem, can it be started once.

3) If the standby motor is automatically put in, restore each control switch to the normal position.

4) If it trips when it is restarted, it shall not be started again until the cause is identified, and the electric gas starter shall be notified to check.

5) After receiving the notice, the electrical operator should check the motor protection action, the thermal relay action, whether the motor stator coil and cable have short circuit, grounding, and wire breakage, whether the protection value is too small, whether the interlocking circuit is normal, whether the switch capacity is too small, whether the machinery is stuck, whether the switch mechanism is good, and measure the insulation resistance of the motor (including the cable).

The insulation device of the motor is unqualified or the motor is leakage and short circuit will trip it.

If a trip occurs during the working process, it is either a failure of the motor equipment or a power supply problem. Only by investigating and solving them one by one can it be possible to return to normal.

The solution to the motor tripping is as follows:

1. A 500V detection shake meter is required.

Check the insulation state of the motor, and the winding of the motor is qualified above 0.5 megaohms. The measurements are between 0.5 and 0.2, proving that there is a problem with the insulation, but there is no leakage. If the measured value is less than 0.2 megaohms or even to zero, it means that it has leaked or shorted or even been grounded, and it needs to be measured to find the cause.

2. Use an electric pen.

The electric motor is inspected and the brightness of the electric pen is observed, which is the same as the brightness of the live wire, indicating that a short circuit or grounding has occurred, and it is necessary to continue to find the corresponding cause. If the brightness of the electric pen is lower than that of the live line, the motor has leakage and the insulation does not meet the requirements, and the first stove liquid needs to be measured. And if the pen is not lit at all, it means that the insulation is fine.

3. In the case that the motor insulation is not a problem, the lack of phase of the power supply and the unstable power supply voltage, the broken motor wire or poor contact will also make it trip, which needs to be checked and eliminated one by one and then repaired. It is also necessary to eliminate the tripping caused by operation error, if it is a human operation error to trip, then it can be restarted after power failure.

Hello, I am happy to serve you, and make the following solution for you: There may be many reasons for the motor tripping, mainly the following: 1. Motor overload:

The motor is overloaded and exceeds the rated load of the motor, which will cause the motor to trip. 2. Motor damage: The insulation of the motor is damaged, or the internal components of the motor are damaged, which will cause the motor to trip.

3. Unstable power supply voltage: The power supply voltage is unstable, which will cause the motor to trip. 4. The motor wiring is wrong

The motor is wired incorrectly, which will cause the motor to trip. 5. Failure of the protection device: The failure of the protection device of the motor will cause the motor to trip.

6. The running time of the electric slag machine is too long: the motor runs for too long, which will cause the motor to trip. Therefore, in order to solve the problem of motor tripping, we must first determine the cause of tripping, and then take corresponding measures to ensure the normal operation of the motor.

The motor starts to trip and checks as follows.

First of all, check whether the insulation of the motor is normal, and check the winding of the motor with a 500V shake meter (megohmmeter), and the megohm and above are qualified;

There is no problem with the motor, less than the megaohm is greater than the megaohm, the insulation is unqualified, but it is not leakage;

Less than a megaohm is not zero, the motor has been short-circuited or leakage, and it is necessary to continue to check to find the cause;

A zero insulation indicates that the motor has been grounded or short-circuited, and it needs to be checked to find the cause.

If there is no shake meter, connect a live wire into the motor coil, measure the shell with an electric pen, and the same bright as the live wire means that the motor has been grounded or short-circuited, and you need to continue to check to find the reason;

Measure the shell with a pen, although it is not as bright as the live wire, but there is obvious brightness, indicating that the motor has leakage and the insulation is unqualified, and it is necessary to continue to check to find the reason;

Measure the shell with a pen, and it is not bright or only faintly bright, indicating that there is no problem with the insulation of the motor.

If the motor insulation is qualified, it may be that the power supply has a lack of phase, the power supply voltage is unbalanced (too much difference), the motor or motor line is broken, and the contact is poor, which needs to be investigated and solved one by one.

Check whether the motor is leaking, in the case of no instrument, the simplest thing is that the motor is insulated from the earth, and then the winding is connected to a live wire, and the electric pen is used to test whether the chassis has voltage, and if there is, leakage. The turn-to-turn short circuit will not trip the leakage switch, but will only cause a three-phase current imbalance. A phase-to-phase short circuit will cause the leakage switch to trip.

The reason why the motor trips when it is turned on:

1. The capacity of the protection switch is too small.

2. The motor is short-circuited.

3. The motor is overloaded or stuck.

The motor is short-circuited. When there is a short circuit in the motor, we must first see whether it is a single-phase motor or a three-phase motor.

The motor is overloaded and the circuit breaker is too small.

Question: Is it okay to remove it and apply the insulating paint directly?

How to deal with the question.

The motor is short-circuited. When there is a short circuit in the motor, we must first see whether it is a single-phase motor or a three-phase motor.

The motor is overloaded and the circuit breaker is too small.

Brush insulating paint.

1.The motor is grounded or burned.

2.Cable grounding or wire grounding, check whether the wire is short-circuited.