Control voltage when using motor holding brakes!
Depending on the motor cable length, a higher output voltage of
the power supply unit is required for operating the motor holding
brakes. Observe the data for operating motors with holding
brakes (see
chapter 5.5 "Control Voltage (24V Supply) " on page
).
Which Continuous Power Must the
Power Supply Unit Supply?
The continuous power of the power supply unit must be greater than the sum
of power consumptions P
N3
of the components to be supplied.
For the power consumption P
N3
, see Project Planning Manual "Rexroth
IndraDrive Supply Units and Power Sections" → Chapter of the respective de‐
vice → "Technical Data" → "Basic Data" → "Data for Control Voltage Supply".
For the power consumption of the control sections (basic control section
circuit board or optional modules), see Project Planning Manual "Rexroth
IndraDrive Control Sections" → index entry "Power consumption"
If required, determine the continuous current I
N3
for selecting the power sup‐
ply unit:
I
N3
= P
N3
/ U
N3
The power consumption is indicated as maximum value of the respective
component and can occur at individual components.
In drive systems with several components, the occurring power consumption
under statistical assumptions will be lower than the calculated one.
Experience has shown that the typical power consumption of drive systems is
at only approx. 70% of the calculated maximum value.
Which Peak Current Must the
Power Supply Unit Supply?
When switched on, the power supply unit must supply the sum of the occur‐
ring inrush currents I
EIN3
or charges I
EIN3
× t
EIN3Lade
.
When the power supply unit is switched on, the power supply unit is loaded
with the charging current to the capacitors of the 24V supply input of the con‐
nected devices. An electronic circuit in each drive controller limits this charg‐
ing current to the value I
EIN3
.
For the data of the inrush current I
EIN3
and its pulse width t
EIN3Lade
for the
individual devices, see Project Planning Manual "Rexroth IndraDrive Supply
Units and Power Sections" → Chapter of the respective device → "Technical
Data" → "Basic Data" → "Data for Control Voltage Supply".
The occurring charging process I
EIN3
× t
EIN3Lade
is controlled by power supply
units with integrated dynamic current limitation, if the power supply units al‐
low the 1.2-fold continuous current for at least 1 second. Therefore, use pow‐
er supply units with integrated dynamic current limitation the continuous pow‐
er of which is at least 20% above the determined sum of power consumptions
P
N3
.
Power supply units with buffer (UPS)
For HMV supply units, use 24 V supplies with buffer times of at
least 100 ms (e.g. UPS), if commutation drops and short-time in‐
terruptions in the application exceed the specified values.
For the 24V supply, take notes on project planning of the mains
connection into account (see
chapter 7 "Project Planning of
).
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
Bosch Rexroth AG
69/309
Project Planning of Control Voltage (24V Supply)
