Installation, commissioning and maintenance of crane frequency control

The following precautions must be strictly followed during the installation, commissioning, use, and maintenance of the variable-frequency speed-regulating bridge crane, otherwise personal injury and equipment damage will occur.

After the control system is connected to the power supply, the commissioning and maintenance personnel must be particularly careful when working. After the power supply is disconnected, the inverter's charging indicator must be off before touching the components inside the cabinet to perform necessary operations.

It is absolutely forbidden to connect the input power to the output terminals U, V, W of the inverter, otherwise the inverter will be burned.

The insulation resistance between the output terminals U, V, and W of the inverter or to ground is absolutely prohibited, otherwise the inverter may be damaged.

Never use a megohmmeter to test the insulation resistance between the output terminals U, V, and W of the inverter or to ground, otherwise the inverter may be damaged.

When a frequency converter controls multiple parallel motors, such as the operation mechanism of the bridge crane, the relay must be heated between the frequency converter and each motor, and the contacts of the relay must enter the control circuit to prevent the motor from overheating. When the inverter stops working, protect the motor. 

When the inverter is used in a hoisting mechanism to control only one motor, it is not necessary to set a thermal relay because the inverter itself has various protection functions such as overcurrent and overheating.

After the inverter wiring is completed, should first check the correctness of the wiring of each line. When the wiring is correct, first cut off the power supply of the inverters of each mechanism. Then turn on the main power, check the main control circuit, limit, auxiliary power, the correctness of the lighting power supply and other auxiliary power supplies, then turn on the power supply power of the corresponding mechanism in turn, and debug the corresponding bridge crane inverter and its speed regulation system.