KEB combivert R6-S Instruction Manual page 11

Storage
2.6 Storage of the Unit
The DC bus of the KEB R6 is equipped with electrolytic capacitors. If the electrolytic
capacitors are stored de-energized, the oxide fi lm working as dielectric fl uid reacts with the
acidic electrolyte and destroys itself slowly. This affects the dielectric strength and capacity of
the unit. If the capacitors start running with rated voltage again, the oxide fi lm tries to build up
quickly. This causes heat and gas and leads to the destruction of the capacitors.
In order to avoid failures, the KEB R6 must be started up according to the following
specifi cation based on duration of storage period (powered off):
Storage Period < 1 Year
* Start up normally, without any additional precautions
Storage Period 1...2 Years
* Power on frequency inverter for one hour without modulation
Storage Period 2...3 Years
* Remove all cables from power circuit
* Open control release
* Connect variable voltage supply to inverter input
* Increase voltage slowly to indicated input level and remain at for the specifi ed time.
Voltage Class
230V
460V
Storage Period > 3 Years
* Input voltages same as above, however double the amount of time for each additional year.
Eventually consider changing capacitors.
Input Voltage
0...160V
160...220V
220...260V
0...280V
280...400V
400...500V
Minimum Time
15 min
15 min
1 h
15 min
15 min
1 h
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