SMA America, LLC 11 Cleaning and Care
Installation Manual SB30-40-US-IA-en-33 79
11.2 Cleaning the Fans
If the inverter displays the message "Derating", the fan may be dirty or defective. Always clean the fan
as per the following procedure.
1. Open the inverter (see Section 9.1).
2. Wait 5 minutes until the fan stops rotating.
3. Check whether the fan guard is dusty or badly clogged.
If the fan guard is dusty, clean the fan guard with a vacuum cleaner.
If the fan guard is badly clogged, remove and clean the fan guard:
• Use a screwdriver to press both catches on the
right edge of the fan guard to the right and
remove from the retainer.
• Carefully remove the fan guard.
• Clean the fan guard with a brush, a paint brush, a cloth, or compressed air.
4. If the fan is soiled, remove the fan:
• Press the fan catches to the center of the fan.
• Slowly remove the fan from the inverter.
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