Maintenance and cleaning
SMA Solar Technology AG
52
WB33-38-IA-IEN120940
Installation Manual
8 Maintenance and cleaning
8.1 Cleaning the Inverter
8.2 Checking Heat Dissipation
You only need to check the heat dissipation of the inverter if a visual inspection reveals a marked
clogging of the fan guard or the inverter frequently goes into the "Derating" operating state. The
ambient temperature and cooling efficiency determines whether the inverter switches to "Derating".
8.2.1 Cleaning the Fans
If the fan guard is only covered in loose dust, it can be cleaned with a vacuum cleaner. If you do not
achieve satisfactory results with a vacuum cleaner, dismantle the fans for cleaning.
Proceed as follows:
1. Disconnect the inverter on both the DC and AC sides as described in Section 7.2 "Opening the
Inverter" (page 48).
2. Wait for the fan to stop rotating.
Cleaning the fan guards
3. To dismantle the fan guard:
– Use a screwdriver to press both latches at the
right edge of the fan guard to the right and
dislodge it from the retainer.
– Carefully remove the fan guard.
4. Clean the fan guard with a soft brush, a paint brush,
a cloth or compressed air.
NOTICE!
Damage to the display by use of cleaning agents
• If the inverter is dirty, clean the enclosure lid, the display and the LEDs with clear
water and a cloth only.
