4.6.2 Project planning of control voltage
Control voltage for drive systems
Some components of a drive system have to be supplied with control voltage.
When doing the project planning for control voltage supply, include the drive
system component requirements:
● Depending on the motor cable length and whether or not motor holding
brakes are used, the permitted tolerances of the supply voltage
● Power consumption of the drive controllers
● Power consumption of other loads (e.g., motor holding brakes, digital
outputs)
● Current carrying capacity of the connection point for control voltage sup‐
ply on the component for the purpose of looping through the control volt‐
age to other components
PELV
1)
for 24V power supply unit
For the 24V supply of the devices of the Rexroth IndraDrive Cs
range, use a power supply unit or a control-power transformer
with protection by PELV according to IEC 60204-1 (section 6.4).
In the scope of CSA/UL, the data of the control-power transformer
are limited to:
● Max. output voltage: 42.4 V
peak
or 30 V
ac
● Max. output power: 10000 VA
Sizing the control voltage supply
Determining the power requirements
Drive controller power require‐
ments
The total power requirements of the control voltage supply of a drive control‐
ler result from the sum of the following power values:
● Basic device (drive controller without connected encoders)
● Optional connection interfaces (e.g., communication, additional encoder
evaluation)
● Connected encoder systems
● External loads
For the configuration of your drive controller, see the type plate and the type
code.
1)
Protective Extra Low Voltage
DOK-INDRV*-HCS01******-PR05-EN-P Bosch Rexroth AG 69/341
Rexroth IndraDrive CsDrive Systems with HCS01
Combining the individual components
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