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AKD2G/AKD/S700 Accessories Manual | 10 Capacitor Modules
10 Capacitor Modules
KCM (Kollmorgen™ Capacitor Modules) absorb energy generated by the motor when it is operating in gen-
erator mode. Normally, this energy is dissipated as waste through brake resistors. KCM feeds the energy
stored back into the DC Bus link as and when it is required.
KCM-S
Saves energy: The energy stored in the capacitor module during regenerative braking is avail-
able the next time acceleration happens. The module's inception voltage is calculated auto-
matically during the first load cycles.
KCM-P
Power in spite of power failure: If the power supply fails, the module provides the drive with
the stored energy that is required to bring the drive to a standstill in a controlled manner (this
only applies to the power supply voltage; battery-back the 24 V supply separately).
KCM-E
Expansion module for both applications. Expansion modules are available in two capa-
citance classes.
10.1 Important Notes
DC Bus link terminals in servo systems carry high DC voltage of up to 900 V. Touching the terminals while
they are carrying voltage is extremely dangerous. Switch off (disconnect) the line voltage. You must only
work on the connections when the system is disconnected.
It can take over an hour for the modules to self-discharge. Check the state of charge with a measuring
device that is suitable for a DC voltage of up to 1,000 V. When measuring a voltage of over 60 V between the
DC+/DC- terminals or to ground, discharge the modules as described in the KCM Instructions Manual.
You must read the instructions manual for the drive / servomotor you are using in your application and
observe the safety instructions they contain before commencing mounting/installation work.
Wiring diagram and more important notes concerning wiring can be found in the KCM instructions manual and
in the instructions manual of the used drive.
40 Kollmorgen™ | kdn.kollmorgen.com | November 2019
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