ABB PQFA Instruction Manual page 97

Step 6 Check
operation.
Step 7 Restart the PQFA according to commissioning procedure.
12.3. Fan
The cooling fan lifespan is about 5 years, depending on usage and ambient
temperature.
Fan failure is often preceeded by increasing noise from the bearings and rise
of the heatsink temperature despite cleaning. It is recommended to replace
the fan once these symptoms appear.
12.4. Capacitors reforming
If the filter has been non-operational for more than one year, DC capacitors
must be reformed (re-aged) before use. Without reforming, capacitors may be
damaged at start-up.
Stocked or non-operational filters should be reformed once a year. The
method indicated below assumes that the filter is stocked in a clean and dry
environment.
To reform the capacitors, switch the power on for about 2 hours, with all
harmonics and reactive power deselected.
If the filter has been left more than 2 years without operation, please contact
your ABB service provider.
ambient temperature
Asea Brown Boveri Jumet S.A.
PQFA Instructions Manual
and equipment ventilation
97