Annex A
GB - 28
Cycle Function
Constant
Pay attention to unusual noises of the motor (e.g. vibrations) as well as of
the frequency inverter (e.g. fan).
Pay attention to unusual smells of the motor or frequency inverter (e.g. eva-
poration of capacitor electrolyte, braise of the motor winding)
Monthly
Check unit for loose screws and plugs and if necessary tighten up.
Clean frequency inverter from dirt and dust deposits. Pay attention especially
to cooling ns and protective grid of the fans.
Examine and clean extracted air lter and cooling air lter of the control
cabinet.
Examine function of the fans of the KEB COMBIVERT. The fans must be
replaced in case of audible vibrations or squeak.
A.4 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 aects 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
storage period in accordance with the following specication:
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 specied time.
Voltage class Input voltage Residence time
230 V
0…160 V 15 min
160…220 V 15 min
220…260 V 1 h
400 V
0…280 V 15 min
280…400 V 15 min
400…540 V 1 h
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