1. When the electric hoist is braked, the stopping sliding distance exceeds the specified requirements
When the electric hoist is used for a long time, the brake ring wears too much, which reduces the pressure of the brake spring and reduces the braking force. The solution is to adjust the brake bolt or replace the brake ring.
2. The temperature of the motor of the electric hoist is too high
First of all, you should check whether the chain hoist china is overloaded. Overloading will cause the motor to heat up. Long-term overloading will burn the motor; if the motor is not overloaded, but still heats up, you should check whether the motor bearing is damaged; you should also check whether the motor works according to the prescribed working system, which also causes the motor to heat up. One of the reasons is that it should work in strict accordance with the motor work system when using it.
When the motor is running, the brake gap is too small, and it is not completely disengaged, resulting in a large friction force. The friction and heat are also equivalent to increasing the additional load, which reduces the motor speed, and the current increases and heats up. At this time, stop working and restart. Adjust the brake clearance.
3. The electric hoist cannot be started again after the heavy object rises to mid-air
First, check whether the system voltage is too low or whether the fluctuation is too large. If this is the case, only restart after the voltage returns to normal. On the other hand, pay attention to the lack of phase during the operation of the three-phase motor, and it cannot be started after shutdown. At this time, it is necessary to check Number of power phases.
4. The electric hoist cannot stop or does not stop at the limit position
This kind of situation is generally the contact of the contactor is welded. When the stop switch is pressed, the contact of the contactor cannot be disconnected, the motor runs as usual, and the hoist does not stop; when it reaches the limit position, if the limiter fails, the hoist does not stop.
In this case, immediately cut off the power to make the hoist stop forcibly. After parking, repair the contactor or limiter. If the damage is serious and irreparable, the miniature electric hoist must be replaced by chain hoist manufacturers.
5. The circuit of the electric hoist has no fault and the motor cannot start
During construction in winter, especially after snow, the motor still cannot be started without a fault in the circuit. The solution is to open the motor cover and pry the motor with a crowbar so that it can rotate freely.
6. The electric hoist wire rope can only go up and down
The reason is that the travel limiter is damaged, and the chain electric hoist of the travel limiter needs to be replaced.
Through the analysis of common faults and solutions of electric hoists, hoist maintenance personnel know where to start inspections when dealing with faults, and improve maintenance efficiency. In addition, it also provides operators with methods to deal with problems on site.