Maintenance and repair of control cabinet

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

2. There are different types of voltage on the 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 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 contacts should not be broken.

4. Use a soft brush or hair dryer to remove dust from the screen board plug-in and all electromagnetic switch parts, and check the status and contact condition of the electrical switch contacts inside the control cabinet, the insulation of the coil surface, and the reliability of the mechanical components.

When replacing the fuse, the fusing current should match the current of the circuit.