144 Maintenance and hardware diagnostics
Fans
See section Maintenance intervals on page 141 for the fan replacement interval in
average operation conditions.
In a speed-controlled fan, the speed of the fan matches the cooling needs. This
increases the life span of the fan.
Main fans are speed controlled. When the drive is stopped, the main fan is kept
running at low speed to cool the control board. IP21 (UL Type 1) frames R5…R9 and
all IP55 (UL Type 12) frames have auxiliary fans that are not speed controlled and run
all the time when the control board is powered.
Replacement fans are available from the manufacturer. Do not use other than
specified spare parts.
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