Cleaning The Fans - SMA SUNNY ISLAND 4.4M Operating Manual

14 Cleaning and Maintenance
14.4

Cleaning the Fans

If the user interface displays the warning Derating due to temp. unusually often, it is likely that one of the fans is
defective or blocked.
Procedure:
• Clean the ventilation grids.
• Clean the fans.
Cleaning the Ventilation Grids
Proceed as follows to clean each ventilation grid.
Procedure:
1. Remove the ventilation grid laterally.
2.
Damage to the inverter due to foreign bodies
• Do not remove the ventilation grid permanently, otherwise foreign bodies could penetrate the enclosure.
3. Clean the ventilation grid with a soft brush, a paint brush, or compressed air.
4. Close the recessed grips with the ventilation grids. Ensure that the assignment is correct. The correct assignment is
marked on the inside of each ventilation grid: links/left for the left-hand side and rechts/right for the right-hand
side.
Cleaning the Fans
Proceed as follows to clean each fan.
Danger to life from electric shock due to high voltages
High voltages are present inside the inverter. When the enclosure lid is removed, live components can be touched
that can result in death or serious injury due to electric shock.
• Disconnect the inverter from all voltage sources (see Section 13, page 132).
• After switching off the inverter, wait at least 15 minutes before opening the inverter to allow the capacitors to
discharge completely.
1. Disconnect the Sunny Island from voltage sources (see Section 13, page 132).
2. Wait for the fans to stop rotating.
3. Check whether the fan guard is dusty or badly clogged.
If the fan guard is dusty, clean it with a vacuum cleaner or a soft brush.
If the fan guard is heavily soiled, remove it and clean it:
134 SI44M-80H-12-BE-en-10
SMA Solar Technology AG
Operating Manual