DOK-INDRV*-HCS02*UL
***-1803-EN-P
Bosch
Rexroth
AG
65/69
Rexroth
lndraDrive
Drive
Controllers
Power
Sections
HCS02
10
10.1
10.1.1
10.1.2
Appendix
Appendix
Discharging
of
Capacitors
Discharging
DC
Bus
Capacitors
In
the drive system Rexroth lndraDrive, capacitors are used
in
the
DC
bus
as
energy stores.
In
drive controllers and particularly
in
supply units, such capac-
itors 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.
Discharging devices have been integrated
in
the components of the drive sys-
tem Rexroth
lndraDrive; within the indicated discharging time, these devices
discharge the voltage
below the allowed
50
V.
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.
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 lndraDrive have been dimensioned
in
such a way that after the supply voltage was cut off, the voltage value falls
below
50
V within a discharging time of a maximum of
30
minutes.
To shorten the waiting time
until voltage has fallen below 50
V,
you can take
the
following measures:
• When using HMV01 supply units (exception: HMV01 .1R-W0120):
Activate the function "ZKS" (ZKS =
DC
bus short circuit)
• Use the discharging device described below
Discharging
Device
Operating
Principle
A contactor
is
installed to switch a resistor to the terminals L
+and
L-
of the
DC
bus connection to discharge the capacitors. The contactor
is
activated via a
control input which
is
supplied with appropriate control voltage.
R
K
Fig.10-1:
L+
Discharging
resistor
Contactor
contact
0
L-
l
R
I
(
Operating Principle
of
Discharging Device
~K:
DA000010v01_nn.fh1 1
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