Storage Of Unit - KEB COMBIVERT F5 Reference Manual

1.1.1. Storage of Unit

The DC bus of the KEB F5 is equipped with electrolytic capacitors. If the
electrolytic capacitors are stored de-energized, the oxide film working as
a dielectric fluid 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 film tries to build up quickly.
This causes heat and gas and leads to the destruction of the capacitors.
To avoid failures, the KEB F5 must be started up according to the following
specification 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 any modulation
Storage Period: 2 - 3 Years
Remove all cables from power circuit, including braking resistor connections
Remove drive enable command
Connect variable voltage supply to inverter input
Increase voltage slowly to indicated input level and remain for specified time.
Voltage Class
230V
480V
Storage Period: > 3 Years
Input voltage same as above, however double the amount of time for each
additional year. Eventually consider changing capacitors.
Storage of Unit
Input Voltage
0 - 160V
160 - 220V
220 - 260V
0 - 280V
280 - 400V
400 - 500V
Minimum Time
15 minutes
15 minutes
1 hour
15 minutes
15 minutes
1 hour
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