Risk of fire caused by the "sacrificing behav‐
ior" of the ZKS stage!
The "ZKS" input activates the "DC bus short circuit" function, when the 24V
control voltage has not been applied and when there isn't any current flowing
to the input. This condition can occur in the following situations:
● Failure of 24V control voltage
● Wire break
● Activation of serially connected contacts (e.g. axis limit switches)
If the kinetic energy of the mechanical axis system regenerated when braking
is greater than the energy absorption capacity of HLB, the HLB device re‐
mains active when braking via ZKS takes place, until it is thermally destroyed
(sacrificing behavior). Risk of fire! In this case, braking via ZKS may only
come into effect in the case of an emergency (e.g. activation of an axis limit
switch causes the mains supply to be cut off and simultaneously causes the
24V supply of the ZKS input to be interrupted).
Install a 24V UPS, if the "sacrificing behavior" of HLB is relevant to your drive
system in the case of an emergency. This prevents the braking via ZKS
which causes HLB to be destroyed due to the failure of the 24V control volt‐
age. Braking via ZKS then will only take place in cases of emergency.
Required type data
To select an appropriate HLR braking resistor, the following type
data of the application are required:
● Peak regenerative power P
RS, Anlage
(See chapter 15.1.7 "Peak Regenerative Power" on page
257)
● Continuous regenerative power P
RD, Anlage
(See chapter 15.1.6 "Continuous Regenerative Power" on
page 255)
● Regenerative power W
R, Anlage
(See chapter 15.1.4 "Regenerative Power" on page 251)
HCS02, HCS03 with HLR01 and simultaneously HLB01
● The continuous power of the selected HLR01 has to be at
least as high as the continuous power of the HLB used.
● Due to differences in balance, the total continuous power is
lower than the sum of the individual continuous powers. The
balancing factor of 0.8 is regarded as the guide value.
Function of integrated braking resistor in HCS02 for operation
with HLR01
Braking resistors have been integrated in HCS02 drive control‐
lers. When operating external HLR01 baking resistors, the inte‐
grated braking resistors are not loaded.
See also parameter
● P-0-0859, Data of internal braking resistor
● P-0-0860, Converter configuration
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
Bosch Rexroth AG 123/309
Configuring the Drive System
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