Maintenance
112
Fan replacement (R1 and R2)
Only frame sizes R1 and R2 include a fan; frame size R0 has natural cooling.
1. Stop the drive and disconnect it from the AC power source.
2. Remove the hood if the drive has the NEMA 1 option.
3. Lever the fan holder off the drive frame with e.g. a screwdriver and lift the hinged 
fan holder slightly upward from its front edge.
4. Free the fan cable from the clip.
5. Disconnect the fan cable.
6. Remove the fan holder from the hinges.
7. Install the new fan holder including the fan in reverse order.
8. Restore power.   
Capacitors
Reforming
The capacitors must be reformed if the drive has been stored for two years. See the 
table on page 20 for how to find out the manufacturing time from the serial number. 
For information on reforming the capacitors, refer to Guide for Capacitor Reforming 
in ACS50, ACS55, ACS150, ACS350, ACS550 and ACH550 [3AFE68735190 
(English)], available on the internet (go to http://www.abb.com
 and enter the code in 
the Search field. 
Control panel
Cleaning
Use a soft damp cloth to clean the control panel. Avoid harsh cleaners which could 
scratch the display window. 
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