4.5 Control Voltage (24V Supply)
PELV
1)
for 24V power supply unit
For the 24V supply of the devices of the Rexroth IndraDrive
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
The data in the table below generally apply to the 24V supply of the devices
of the Rexroth IndraDrive range. For other data, such as power consumption
and inrush currents, see the technical data of the respective device.
The specified values apply at the connections (+24V, 0V) to the "24V supply"
of the devices!
Description Symbol Unit Value
Control voltage for drive systems without
operation of motor holding brakes in
Rexroth motors
U
N3
V 19,2 … 30 (see also "Max. ripple content")
Control voltage for drive systems with op‐
eration of motor holding brakes in
Rexroth motors
U
N3
V Observe the following aspects when selecting the control
voltage:
● Voltage drop on the line between drive controller
and motor (current consumption, copper cross sec‐
tion, cable length)
● Allowed voltage tolerance of the brake (see data
sheet of brake)
When using Rexroth cables up to a cable length of 40 m:
24 V ±5%
Max. ripple content w - The amplitudes of the alternating component on U
N3
must
be within the specified voltage range.
Maximum allowed overvoltage U
N3max
V 33 (max. 1 ms)
Fig.4-11: Control Voltage
Overvoltage
Overvoltage greater than 33 V has to be discharged by means of
the appropriate electrical equipment of the machine or installation.
This includes:
● 24V power supply units that reduce incoming overvoltage to
the allowed value.
● Overvoltage limiters at the control cabinet input that limit ex‐
isting overvoltage to the allowed value. This, too, applies to
long 24V lines that have been run in parallel to power cables
and mains cables and can absorb overvoltage by inductive
or capacitive coupling.
1)
Protective Extra Low Voltage
DOK-INDRV*-HCQ-T+HMQ-T-PR03-EN-P
Rexroth IndraDrive Drive Controllers HCQ, HCT
Bosch Rexroth AG 39/145
General Data and Specifications
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