When the reducer cannot be started, the motor cannot be forcibly started multiple times, which will cause damage to the motor.It should be analyzed in detail according to the actual situation and symptoms, and start after finding out the reason why the reducer cannot be started. The purpose of this is to prevent the expansion of electric faults.What are the reasons for the electrification of the reducer housing?Why is the reducer housing live?
Especially in the case of abnormal noise or overheating in the reducer, the power supply should be disconnected in time when the temperature is too high to ensure that the electric motor is not damaged.From these small problems to protect the motor, solving these small problems can avoid the expansion of electric faults, and can extend the service life of the electric motor.When the reducer cannot move, we should start to find the reason from the following aspects:
1. Check whether the power of the reducer is connected;
2. The fuse is blown;
3. The stator or rotor winding is open;
4. The stator group is grounded;
5. Short circuit between stator windings;
6. Wiring error of stator group;
7. The overloaded transmission machinery is crushed;
8. The rotor copper bars are loose;
9. Whether the lubricating grease in the reducer bearing is used up, the reducer has been added with lubricating grease before leaving the factory. It runs for 20000 hours under normal conditions, and there is no need to replace the lubricating grease, but when operating under special environmental conditions, such as high temperature, long time The oil change frequency during operation is 10000-15000 hours.Therefore, you should pay attention to the frequency of oil replacement when using the reducer. There may also be expansion of the rotating shaft due to heat, which hinders the rotation in the bearing.
10. Incorrect or damaged control equipment wiring;
11. The overcurrent breaker is adjusted too small;
12. The oil cup of the old-fashioned walking switch is short of oil;
13. The rotor resistance of the wound rotor motor is improperly equipped.
The housing of the reducer in normal operation is not allowed to be charged. In order to prevent the housing of the motor from being charged, the common reasons that cause the housing of the motor to be charged are summarized as follows.
1. The power line and the ground line are wrong;
2. Leakage caused by damage to the stator winding insulation.The reasons are: the three-phase asynchronous motor has been used for too long and the winding insulation is aging; or foreign matter enters the motor and damages the winding insulation; or the motor is overloaded for a long time and the winding is burned out; or the power supply voltage exceeds the rated motor. Voltage causes insulation breakdown of stator windings, etc.These may make the metal shell of the motor live.In addition, if the environment around the motor is humid; or the motor is under rain and snow, water droplets enter the motor; or due to the erosion of harmful gases.These will reduce the insulation performance of the three-phase fixed winding (decrease the insulation resistance), and make the metal shell of the motor live.
3. The windings of the motor are in love with tide, and the insulation aging reduces the insulation performance;
4. The lead wire and the junction box touch the shell;
5. Local winding insulation damage causes the wire to hit the shell;
6. The connection to the first line fails;
7. The wiring board is damaged or the surface is oily;
8. The iron core is loose and punctures the wire.