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1. First check the fuse on the monitoring board (17001-03465) to see if it is blown. This is the most common direct cause of this fault.
2. If the fuse is normal and a spare SNMP module is available on-site, replace the SNMP module directly and observe whether the indicator returns to normal.
3. If both of the above are normal, the fault is most likely in the connection cable between the SNMP module and the monitoring board（J16）.

Preventive measures:
1. During operation, ensure the SNMP module is connected to the port marked “Network”.
Incorrect connection to the “COMM” port may cause faults such as blowing the fuse on the monitoring board.

 1. It is recommended that UPS and the battery pack are from the same manufacturer. Because the charging parameters of UPS from different manufacturers are inconsistent, if the parameters do not match, it is easy to cause battery damage..
2. If it is really necessary to use separately, the charging parameters must be clearly communicated to the customer and the parameters must be recorded and filed.
3. Install a battery temperature collector, battery over-temperature alarm, to prevent fire.

A:  (The common cause of this fault is usually the problem with the cabinet.)
1. Check if the UPS parallel parameters are set properly.
2. Check if the jumpers on the UPS's parallel board are set according to the actual number of parallel units of the equipment.
3. Apply a small load to the UPS, then use a clamp meter to check if there is a significant discrepancy between the UPS output current and the current displayed on the screen, so as to determine whether the current transformer in the cabinet is abnormal. If the current is abnormal, power off the UPS completely, and use a multimeter to check the continuity of the current transformer pins in the cabinet to verify whether it is functioning properly.
4. Insert a module that can work normally into the cabinet, but if this alarm still occurs, it is recommended to replace the monitoring board of the cabinet.
5. If it is determined that the problem lies in the power module, first check the output board of the module. If there is no issue with the output board of the module, please replace the control board of the module.

1. Remove the metal shield on the back of the UPS screen, check the manufacturer and batch information on the back of the screen, and provide this information to the engineer for analysis.
2. ① If the screen manufacturer is XRD brand and the batch is before July 2023, the engineer will provide the screen upgrade program and method, and users can solve the screen frozen problem by upgrading the screen program.
② If the screen manufacturer is XRD brand and the batch is from July 2023 or later, or if the screen manufacturer is DWIN brand. Please power off the UPS then loosen the screen fixing screws slightly to prevent the plastic part from pressing against the screen and causing it to freeze. Restart the UPS and check if the screen is stuck.
3. If the screen still freezes after the above method, you can contact engineer to replace the screen.

1. Check if the parallel parameter settings of UPS are normal.
2. Check if the jumper cap on the parallel board of UPS is set according to the requirements.
3. Check which device in the parallel system has the alarm and replace the parallel cable for inspection.
4. If the UPS is three-phase input, check if the equipment is connected to the three-phase input source. If the single-phase input source is divided into three wires and connected to the equipment, it will cause three-phase imbalance in the equipment input, with current on the N wire, resulting in parallel failure.

Turn off the air conditioner power, remove the humidifier cylinder, and clean the scale inside the humidifier cylinder.

 Fiber optic issues account for a significant proportion of fiber communication faults. First, clean the dust from both ends of the unit's fiber optic cable. If the fault persists, try replacing the unit's fiber optic cable. If the above methods still fail to resolve the issue, consider replacing the power board or the unit's driver board.

 When the device malfunctions, identify the problem based on the following symptom descriptions and attempt resolution accordingly:
Scenario 1: Error during operation
If the device powers on normally initially but subsequently displays ‘Upgrading’ on the LCD screen during operation, accompanied by LED indicators showing E32 or E33 errors, this is typically caused by a hardware short circuit. First verify the motor wiring is correct and undamaged, then inspect the driver board for short circuits in the lower bridge or to ground.
Scenario 2: Upgrade Failure
During remote upgrades, if the LCD displays ‘Upgrading’ alongside an LED reading of ‘88888’ for over 4 minutes, this indicates upgrade failure due to communication timeout. Ensure a stable network connection and retry the upgrade. If the device reboots with an ‘A-in’ error after failure, the upgrade may be attempted again.
Scenario 3: Operation Stuttering
During factory reset or parameter backup, if the LCD screen displays ‘Upgrading’ accompanied by brief LED stuttering, this is typically caused by an outdated LCD keypad software version (e.g., V2.00). Resolve this by upgrading the LCD keypad software to a version compatible with the mainboard (e.g., V2.05 or higher).
Scenario 4: Sudden Abnormal Operation
If the LCD screen unexpectedly displays ‘Upgrading’ during normal operation while the LED remains normal, this likely indicates poor contact. Immediately inspect all cables and connectors for secure connections, attempt to reconnect them, and restart the device.
General troubleshooting principles
When encountering issues, it is advisable to first verify all physical connections are intact, followed by checking software version compatibility. Should the problem persist after these steps, please retain relevant error messages and contact technical support for further assistance.

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.