18.5
Discharging of Capacitors
18.5.1
Discharging DC Bus Capacitors
Capacitors as Energy Stores
In the drive system Rexroth IndraDrive, capacitors are used in the DC bus as
energy stores. In drive controllers and particularly in supply units, such ca‐
pacitors have already been integrated.
Energy stores maintain their energy even when the supply voltage has been
cut off and have to be discharged before somebody gets in contact with
them.
If additional capacitors (such as DC bus capacitor units) are connected, these
capacitors, too, have to be discharged before somebody gets in contact with
them.
Discharge Time
Discharging devices have been integrated in the components of the drive
system Rexroth IndraDrive; within the indicated discharge time, these devi‐
ces discharge the voltage below the allowed 50 V.
Due to the operating principle, the discharge time is the longer
●
the bigger the energy store (the capacitance value)
●
the higher the voltage to which the energy store has been charged
●
the greater the resistance for discharging the capacitors
Components of the drive system Rexroth IndraDrive have been dimensioned
in such a way that after the supply voltage was cut off, the voltage value falls
below 50 V within a discharge time of a maximum of 30 minutes.
HMV01 and ZKS
When using HMV01 supply units (exception: HMV01.1R-W0120), you can
take the following measure to shorten the waiting time until the voltage has
fallen below 50 V:
Activate the "ZKS" function (ZKS = DC bus short circuit)
Bosch Rexroth AG
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
296/309
Appendix
