16
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 lm working as
a 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.
To avoid failures, the KEB F5 must be started up according to the following
specication 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 specied time.
Voltage Class Input Voltage Minimum Time
230V
0 - 160V 15 minutes
160 - 220V 15 minutes
220 - 260V 1 hour
480V
0 - 280V 15 minutes
280 - 400V 15 minutes
400 - 500V 1 hour
Storage Period: > 3 Years
Input voltage same as above, however double the amount of time for each
additional year. Eventually consider changing capacitors.
1.2.11. Storage of Unit
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