Rexroth EcoDrive 03 DKC**.3-040...200 Appendix 6-1
DOK-ECODR3-DKC40*200UL-IB01-EN-P
6 Appendix
6.1 Discharging of DC Bus Capacitors
In the drive system Rexroth IndraDrive capacitors are used in the DC bus
as energy stores. In the drive controllers and particularly in the supply
units such capacitors have already been integrated.
Energy stores maintain their energy even when energy supply has been
cut off and have to be discharged before somebody gets in contact with
them.
Discharging devices have been integrated in the components of the drive
system Rexroth IndraDrive; within the indicated discharging time these
devices discharge the voltage below the allowed 50 V.
If additional capacitances in the form of
• DC bus capacitor units or
• additional capacitors
are connected, make sure that these capacitors, too, are discharged
before somebody gets in contact with them.
Due to the operating principle, the discharging 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 energy supply was cut off the
voltage value falls below 50 V within a discharging time of a maximum of
30 minutes.
WARNING
Lethal electric shock caused by live parts with
more than 50 V!
⇒
Wait at least 30 minutes after switching off power to
allow discharging.
⇒
Check whether voltage has fallen below 50 V before
touching live parts!
To shorten the waiting time until voltage has fallen below 50 V you can
take the following measures:
• Activate the function “ZKS” (DC bus short circuit) when using HMV01
supply units.
WARNING
Lethal electric shock caused by live parts with
more than 50 V!
⇒
Before touching live parts check whether the voltage
has fallen below 50 V!
• Use the discharging device described below.
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