- Mar 22, 2013 -
Factors of electric hoist doesn't work after starting
Mainly because the wire rope electric hoist does not connect the rated working voltage and can not work, generally there are the following cases:
1) power supply system for electric wire rope hoist control box power transmission, generally used shidianbi test.
2) wire rope electric hoist control box main and control circuit electrical damage, line disconnection or bad contact, as well as the control button inside the line contact is not good, will also make the gourd motor unable to electrify. This happens. We need to overhaul the main control loop and control button. Maintenance, in order to prevent the main power supply and control circuit for three-phase motor phase and burning motor, electric motor or hoist suddenly running harm, must be disconnected from the power supply circuit of motor hoist, only to the main control circuit, power supply, the control button in the line connected, starting point and stop switch, check the work condition analysis and electrical lines, on the problem of electrical or line repair or replacement, when confirming the main control circuit, when no fault can be re run.
3) the end voltage of the hoist hoist motor is over 10% lower than the rated voltage, and the starting torque of the motor is too small so that the hoist can not lift the goods and can not work. When measuring, the motor's input terminal voltage is measured by multimeter or voltmeter. It is determined that when the voltage is too low to enable the motor to start, it needs to wait for the system voltage to return to normal and then use the electric hoist. In addition, when the section area of the external power cord is too small, the motor can not get enough startup current and can't start. At this time, the power supply line that meets the required area should be replaced.
4) sometimes hoist motor voltage is normal, while the gourd is not working, it should be considered for other reasons, such as motor burned, repair need to replace the motor; not hoist long, poor maintenance and other reasons make the brake wheel and the end cover of rust, when starting off the brake wheel, the motor only abnormal noises and do not start, hoist can not work. At this time, the brake wheel should be unloaded, the rust surface should be cleaned, and the car should be re tested. If the motor sweeps the bore seriously, it will also make the motor do not rotate. If this condition is found, it should be stopped. It is necessary to repair or replace the motor to ensure the normal operation of the gourd.
5) in production, it is strictly prohibited to overload the electric hoist. When the cargo is overloaded, the hoist can't lift the goods. The lifting motor only makes a strange noise instead of running. It will burn down the motor and even cause an accident if it is serious. At this point, it should stop immediately, lighten the goods and make the gourd work under the rated load. In order to prevent the overload operation of the electric hoist, lifting weight should be installed for overload limiter, automatic alarm when lifting the weight of 95% rated load, automatically cut off the power supply reached 105%, to reach the purpose of overload protection.