Storage; Cooling Circuit - KEB COMBIVERT F5 Instructions For Use Manual

MAINTENANCE

10.3 Storage

The DC link of the KEB COMBIVERT is equipped with electrolytic capacitors. If the
electrolytic aluminium capacitors are stored de-energized, the internal oxide layer is re-
moved slowly. Due to the leakage current the oxide layer is unrenewed. If the capacitor
starts running with rated voltage there is a high leakage current which can destroy 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
•
Storage period 1...2 years
•
Storage period 2...3 years
•
•
•
•
Storage period > 3 years
•
After expiration of this start-up the KEB COMBIVERT can be operated on nominal rating
conditions or delivered to a new storage.

10.3.1 Cooling circuit

The cooling circuit must be completely empty if a unit shall be switched off for a longer
period. The cooling circuit must be blown out additionally with compressed air at tem-
peratures below 0°C.
Start-up without special measures
Operate drive converter one hour without modulation
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
400 V
Input voltages as before, however double the times per year. Eventually change
capacitors.
Input voltage
0...280 V
280...400 V
400...500 V
Residence time
15 min
15 min
1 h
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