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Commissioning and Diagnostics
3.3
Commissioning after a lengthy storage period
Caution
!
If the Frequency Converter is not used for some time, the capacitors in the
intermediate circuit can become conductive. At the rated voltage this can cause
irreparable damage to the Frequency Converter. To avoid this happening, the
capacitors must be reformed. The procedure required to do this depends on the
length of the storage period.
Table 3-1
Length of the storage
Up to 1 year
1 to 2 years
2 to 3 years
Up to 3 years
3-4
Forming procedure after a lengthy storage period
period
No forming required
Switch on the power supply an hour before the frequency
converter is started for the first time.
Before the frequency converter is used for the first time,
increase the voltage supplied by increments as follows using
an adjustable AC voltage supply:
1. 30 minutes at 25% of the rated voltage
2. 30 minutes at 50% of the rated voltage
3. 30 minutes at 75% of the rated voltage
4. 30 minutes with the rated voltage
Before the frequency converter is used for the first time,
increase the voltage supplied by increments as follows using
an adjustable AC voltage supply:
1. 2 hours at 25% of the rated voltage
2. 2 hours at 50% of the rated voltage
3. 2 hours at 75% of the rated voltage
4. 2 hours with the rated voltage
Forming procedure
EM 148-FC Frequency Converter
A5E00065321-03
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