Storage; A.4 Storage - KEB Combivert F5 series Installation Manual

Annex A
Cycle
Constant
Monthly
A.4

Storage

The DC link of the KEB COMBIVERT is equipped with electrolytic capacitors. If electrolytic
capacitors are stored de-energized, the oxide film working as dielectric fluid 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 film 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 specification:
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 specified time.
Voltage class
230 V
400 V
GB - 28
Function
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)
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 fins and protective grid of the fans.
Examine and clean extracted air filter and cooling air filter 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.
Input voltage
0...160 V
160...220 V
220...260 V
0...280 V
280...400 V
400...540 V
Residence time
15 min
15 min
1 h
15 min
15 min
1 h
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