9. System Maintenance
9.1 Routine Maintenance
9.1.1 Clean the Chassis
● Before performing any operation, disconnect the AC and DC power supply
and wait for 5 minutes after the system is powered off.
● Wipe the dust off the chassis and clean the chassis with a moistened cloth.
1) Check periodically that the humidity is within the acceptable range and keep it away from
dust;
2) Check the ventilation and heat dissipation of the equipment regularly. For details, see Section
9.1.2.
9.1.2 Fan Maintenance
● Only qualified and trained electrical technicians are allowed to perform
operations. Technicians must observe instructions in this manual local
regulations.
● Before performing any operation, disconnect all power supplies and wait for
5 minutes until the residual voltage is completely discharged.
● Do not use the air pump to clean the fan. Otherwise, the fan may be damaged.
Ventilation and heat dissipation is essential to protect the WIT Inverter from performance de-rate
due to excess heat. The fan in the WIT Inverter works to cool the components and the heat sink
when the temperature is too high. Check the following possible causes and measures when an
exception occurs:
1> The fan is stuck with foreign objects or there is dust accumulation on the heat sink; clean the
fan cover, fan blades and the heat sink.
2> The fan is damaged and needs to be replaced.
3> The installation position of the WIT Inverter is not well-ventilated. Select an appropriate
installation position that meets the basic installation requirements.
Cleaning and replacing the fan:
1> Before cleaning or replacing a fan, disconnect the DC and AC power supply and wait for at
least 5 minutes.
2> Remove the fan fixing plate using a cross-head screwdriver, as shown in Fig 9.1:
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