10.7.4
24 V Voltage Supply
24 V voltage supply
The 24 V voltage supply can either be realized with or without electrical isola‐
tion.
24 V voltage supply: Setup without
electrical isolation
An easy connection method is the set-up without an electrical isolation be‐
tween the internal logic and the peripheral supply.
In this case, a power supply unit is appropriate to supply the control.
The power output must not exceed 240 W!
The GND (U
LS
) is grounded in the device!
U
S
FE
GND
GND (U
S
,
U
M
)
2.1
1.1
1.2 2.2
1.3 2.3
1.4 2.4
U
S
U
LS
U
M
(1)
1
2
(1)
FE
+ 24 V 0 V
PE PE
LS
(U )
Load and logic power supply unit
Overvoltage
category I
24 V
E.g.
serial terminal UKS6-FSI/6
automatic cut-out TCP10A
by PHOENIX CONTACT
The polarity reversal can cause the destruction of the device
(fire hazard) if there is no additional external protection.
This is caused by the simultaneous grounding of the GND (U )
in the device and the GND (U ) load (PELV) at the power supply unit.
LS
LS
Fig.10-25:
Setup without electrical isolation
Destruction of the device caused by polarity
reversal at the power connector without addi‐
tional external fuse. This is caused by simul‐
taneous grounding of the GND (U
LS
) in the
device and the grounding of the GND (U
LS
)
load (PELV) at the power supply unit. This
causes a short-circuit in the device.
NOTICE
Ensure that there is an external fuse.
24 V voltage supply: Reference
conductor connected to the pro‐
tective conductor and set-up with
electrical isolation
Provide electrical isolation between the logic of the central processing unit
and the I/O interfaces of the peripheral devices according to DIN EN
60204-1. Accordingly, the voltage U
LS
(24 V logic voltage) is electrically isola‐
ted from the voltages U
S
(24 V segment voltage) and U
M
(24 V main voltage)
in the control.
If the reference conductor GND U
LS
is connected to the protective conductor
system, this connection has to be arranged at a central place (e. g. at the
load power supply unit). Hence, the supply current circuit is a PELV circuit.
Bosch Rexroth AG
DOK-CONTRL-IC*LX5*****-IT01-EN-P
Rexroth IndraControl L25, L45, L65 and L85 Controls
40/65
Mounting, Dismounting and Electrical Installation
