A: Maintenance and cleaning of inverters are crucial for ensuring long-term stable operation of the equipment. Below are detailed maintenance and cleaning procedures along with important precautions:

Daily Cleaning and Maintenance Steps
1. Safety Preparations
After shutdown, first disconnect the main power supply at the high-voltage switchgear and close the earthing switch.
Disconnect the VFD's control power supply and UPS power source.
Wait at least 15 minutes to ensure capacitors within the power units are fully discharged before opening cabinet doors to prevent electric shock hazards.
2. Cleaning Dust Filters
In high-dust environments, weekly cleaning of intake air filters is recommended.
After cleaning, use a vacuum cleaner to thoroughly remove accumulated dust from the cabinet interior.
3. Cabinet Interior Cleaning and Inspection
Carefully remove dust from the surfaces of power units, control boards, and other components using a vacuum cleaner, taking care to avoid damaging precision electronic components and fibre optic connectors.
Inspect the fibre optic plugs on each power unit for any signs of looseness, ensuring all connections are secure.
5. Tightening Inspection
Within the first month of inverter operation, it is advisable to retighten all incoming/outgoing cables and control terminal connections.
Thereafter, conduct regular inspections and retightening every six months, covering all power and control cables.
6. Resuming Operation
Upon completing cleaning and inspection, ensure no tools or foreign objects remain inside the cabinet before closing all electrical cabinet doors.
Restore power supply and document the details of this maintenance inspection.

Key Considerations
Cooling System Inspection: During routine patrols, verify the normal operation of cooling fans. A simple test involves placing an A4 sheet at the cabinet's air intake; the paper should adhere firmly to the filter screen, indicating adequate air pressure.
Environmental Requirements: Maintain cleanliness within the VFD room, ensuring ambient temperatures do not exceed 40°C and adequate ventilation is provided.
Standby Unit Maintenance: For standby power units, it is recommended to power them up and run them once every six months to ensure they remain in good working order. Additionally, ensure the fibre optic socket plugs on standby units are securely inserted to prevent contamination.