System Maintenance; Routine Maintenance; Clean The Chassis; Fan Maintenance - Growatt WIT 50K-A User Manual

9 System Maintenance

9.1 Routine Maintenance

9.1.1 Clean the Chassis

Before performing any operation, disconnect the AC and DC power
Ÿ
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
Ÿ
cloth.
DANGER
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

Ÿ 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
Ÿ
wait for 5 minutes until the residual voltage is completely discharged.
DANGER
Ÿ Do not use the air pump to clean the fan. Otherwise, the fan may be
damaged.
WARNING
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:
89
风扇盖
Fig 9.1 Position of the fan fixing plate
3> Disconnect the fan connector, remove the fan fixing plate with a screwdriver, and
remove the fan, as shown in Fig 9.2:
Fig 9.2 Position of the fan
NOTE:
① WIT 50-100K-A, WIT 50-100K-H, WIT 50-100K-AE, WIT 50-100K-HE models have five
external fans;
② WIT 50-100K-AU and WIT 50-100K-HU models have seven external fans;
4> Clean the fan cover, fan blades, and the heat sink, or replace the fan.
(1) Use an air pump to clean the heat sink, and use a brush or wet cloth to clean the fan
and the its cover;
(2) Remove the fan for cleaning if necessary;
(3) Remove the fan that needs to be replaced using a cross-head screwdriver and install a
new fan.
(4) Bind the cables and fix them with a cable tie.
(5) Reinstall the fan, the fan fixing plate, and the WIT Inverter.
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