5.2 Storage
The DC link of the KEB COMBIVERT is equipped with electrolytic capacitors. If elec-
trolytic capacitors are stored de-energized, the oxide film working as dielectric fluid re
-
acts with the acidic electrolyte and destroy themselves slowly. This affects the dielectric
strength and the capacity.
If the capacitor starts running with rated voltage, it is tried to build the oxide film abrupt
again. This causes heat and gas and leads to the destruction of the capacitor.
In order to avoid defectives, the KEB COMBIVERT must be started up depending on the
storage period in accordance with the following specification:
Storage period < 1 year
• Start-up without special measures
Storage period 1…2 years
• Operate drive converter one hour without modulation
Storage period 2…3 years
• Remove all cables from the power circuit; especially of braking resistor or module.
• Open control release
• Connect variable transformer to drive converter input
• Increase variable transformer slowly to indicated input voltage (>1 min) and remain
at least on the specified time.
Voltage class
Input voltage
Residence time
230 V
0…160 V
15 min
160…220 V
15 min
220…260 V
1 h
400 V
0…280 V
15 min
280…400 V
15 min
400…500 V
1 h
Storage period > 3 years
• Input voltages as before, however double the times per year. Eventually change
capacitors. Change the capacitors optionally.
After expiration of this start-up the KEB COMBIVERT can be operated on nominal rating
conditions or delivered to a new storage.
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