Maintenance
BA8230 168
7.4 Reforming the link capacitors The high quality aluminium electrolytic capacitors installed in the 8230 frequency
inverter must be reformed before the 8230 frequency inverter is switched on after a
longer period of storage with the power disconnected. Reforming is required for
reconstructing the insulating layers. The storage temperature is very important for
determining when reforming is necessary. If the storage temperature is exceeded
during storage with the power disconnected, reforming with a limited current must be
carried out before rated voltage is applied to the inverter, as otherwise the capacitors
may be damaged and availability of the unit will be limited.
Storage time without reforming: 2 years
Of that, max. 5 months at a storage temperature of ϑ > 40 °C up to max. 65 °C
Important !
Reforming is required after 9 months when storing at temperatures over 55 °C up to
max. 65 °C with the power disconnected.
Fig. 54: Circuit for reforming link capacitors
Proposed dimensions for 380 ... 480 V:
CRVQ
1µF/1600 V
1000 Ω/600 W
Isopack DDB2U15N MBS 25
1600 V/12 A 0.25 ... 0.40 A
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