Rexroth IndraDrive Appendix 19-5
DOK-INDRV*-SYSTEM*****-PR02-EN-P
Discharging Device
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.
DA000010v01_en.fh7
K
R
L+
L-
R: discharging resistor
K: contactor contact
Fig. 19-4: Operating principle of discharging device
The individual components have to be sufficiently dimensioned:
• The value of the discharging resistor has to be dimensioned with
1000 ohm and at least 1000 W.
• The discharging resistor and the contactor contact have to withstand
the loads of practical operation (for example in the case of frequent
use of the discharging device of the occurring continuous power).
• The contactor contact has to withstand the occurring direct voltage of
min. 1000 V.
• The contactor contact has to withstand the occurring discharging
current according to the resistance value that is used, i.e. 1 A with
1000 ohm.
Observe the proceeding when using the discharging device:
1. Install discharging device before switching energy supply on for the
first time and establish safe electrical connection between discharging
device and object to be discharged.
2. On mains side switch off energy supply to drive system before
activating discharging device.
3. Activate discharging device.
WARNING
Lethal electric shock caused by live parts with
more than 50 V!
⇒
Before touching live parts check in any case whether
the voltage between the DC bus terminals L+ and L-
has fallen below 50 V!
Operating Principle
Dimensioning
How to Proceed for Discharging
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