1) power supply system for electric wire rope hoist control box power transmission, generally used shidianbi test.
2) electric wire rope hoist control box, main control loop electrical damage, line disconnection or poor contact, and the control button in the line is bad, will also make the hoist motor no electricity, appear this kind of circumstance, the need of maintenance, the main control circuit and the 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) hoist hoist motor terminal voltage is lower than the rated voltage of more than 10%, motor start torque is too small, so that hoist can not afford to lift the goods,
Unable to work. Check the use of multimeter or voltmeter and other tools to measure the input voltage of the motor, to determine the voltage is too low, so that the motor can not start, you need to wait for the system voltage to return to normal after the use of electric hoist. In addition, when the cross sectional area of the external power line is too small, the motor can not get enough starting current and can not start. At this time, the sectional area should be replaced to meet the required power line.
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 point, the brake wheel should be removed, cleaned and corroded, and then re tested. When the motor is seriously swept, the motor will not turn. It is found that this situation should be stopped and that the motor must be overhauled or replaced to ensure the normal operation of the hoist.
5) in the production of overloading is strictly prohibited the use of electric hoist when the goods are excessive overloading, hoist cranes can not afford the goods, the lifting motor only abnormal noises and does not run, which will destroy the motor, even cause accidents, then immediately shut down, reduce the goods, to hoist working at rated load. In order to prevent the overload use of electric hoist, should be installed from the weight overload limiter, when the weight reached 95% of the rated load, automatic alarm, when 105% to automatically cut off the power supply, to overload protection purposes