Maintenance and repair of variable frequency control cabinet

1. Disconnect the power supply from the variable frequency control cabinet, check if the rack is reliably grounded, and ensure that the grounding resistance is not greater than 4 Ω.

2. There are different types of voltages on the variable frequency control cabinet (DC 110V; AC single-phase 220V; three-phase AC), and it is necessary to distinguish the circuit during maintenance to prevent short circuit accidents.

3. All electrical switches on the variable frequency control cabinet should be flexible and reliable in operation, without significant noise, and there should be no looseness in the connecting wire joints and terminals. The steel wire at the connecting wire joints of the moving contact should not be broken.

4. Use a soft brush or hair dryer to clean the dust accumulation on the screen board plug-in and all electromagnetic switch parts, and check the status and contact condition of the electrical switch contacts inside the variable frequency control cabinet, the insulation of the coil surface, and the reliability of the mechanical component actions.

5. When replacing the fuse in the variable frequency control cabinet, the fuse current should match the current of the circuit.