KEB G6 - Shut down; Storage; A.3 Shut down

GB - 23
Annex
A.3 Shut down
A.3.1 Storage
The DC link of the KEB COMBIVERT is equipped with electrolytic capacitors. If electrolytic
capacitors are stored de-energized, the oxide lm working as dielectric uid reacts with the
acidic electrolyte and destroy themselves slowly. This affects the dielectric strength and the
capacity.
If the capacitor starts running with rated voltage, it is tried to build the oxide lm abrupt again.
This causes heat and gas and leads to the destruction of the capacitor.
In order to avoid defectives, the KEB COMBIVERT must be started up depending on the sto-
rage period in accordance with the following specication:
Storage period < 1 year
• Start-up without special measures
Storage period 1…2 years
• Operate frequency inverter one hour without modulation
Storage period 2…3 years
• Remove all cables from the power circuit; especially of braking resistor or module
• Open control release
• Connect variable transformer to inverter input
• Increase variable transformer slowly to indicated input voltage (>1 min) and remain at
least on the specied time.
voltage class Input voltage Residence time
400 V
0…280 V 15 min
280…400 V 15 min
400…500 V 1 h
Storage period > 3 years
• Input voltages as before, however double the times per year. Eventually change capaci-
tors.
After expiration of this start-up the KEB COMBIVERT can be operated on nominal rating con-
ditions or delivered to a new storage.