MAINTENANCE Service Manual M4 - M10
24.01.2003 Page 22
than 1 year de-energised, consult factory before connecting the power.
Spare capacitors
When using the spare part capacitors from stock and it is known that they
have been there over one year as voltage free, the re-forming of capacitors is
easiest to perform before capacitors are installed inside unit.
For loose capacitors, the DC-supply current limit is set to value 50…100 mA
and voltage is set up to rated value of capacitors. The degree of re-forming
process can be then followed by indication of the current meter of the DC
power supply. It is still recommended to keep voltage at least 1 h even that
leakage current is already stabilized earlier.
Note! Due high leakage resistance the dangerous voltage can remain in
capacitors long time. Discharge capacitors by using resistors after re-
forming.
In case re-forming is not done for loose capacitors, the re-forming has to be
done for complete frequency converter according to above instruction.
Figure 6.2. Re-forming of loose capacitor using adjustable DC-supply.
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