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1.5.11 Storage of the Unit
The DC bus of the KEB F5 Combivert is equipped with electrolytic capacitors.
If the electrolytic capacitors are stored de-energized, the oxide  lm working as
dielectric  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  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 F5 Combivert must be started up according to
the following speci 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, including braking resistor and GTR7 connections
*
Open control release
*
Connect variable voltage supply to inverter input
*
Increase voltage slowly to indicated input level and remain at for the speci ed time.
Voltage Class Input Voltage Minimum Time
230V 0...160V 15 min
160...220V 15 min
220...260V 1 h
480V 0...280V 15 min
280...400V 15 min
400...500V 1 h
Storage Period > 3 Years
*
Input voltages same as above, however double the amount of time for each additional year.
Eventually consider changing capacitors.
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