Grounding - Bosch Rexroth IndraControl L25 Instruction Manual

DOK-CONTRL-IC*LX5*****-IT01-EN-P
Rexroth IndraControl L25, L45, L65 and L85 Controls
Dimensioning the voltage supply
10.7.5

Grounding

Functional earth ground
Grounding screw
Logic power supply unit
Load power supply unit
PE
0 V 24 V
0 V 24 V
Overvoltage
category I
24 V
Disconnectable
connections
E.g.
serial terminal UKS6-FSI/6
automatic cut-out TCP10A
by PHOENIX CONTACT
(1)
The polarity reversal can cause the destruction of the device
(1)
(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
Fig.10-26: Reference conductor connected to the protective conductor
NOTICE
Ensure that there is an external fuse.
Do observe the maximum currents when dimensioning the voltage supply. Di‐
rectly at the device, a voltage of 20.4 V to 28.8 V must be available.
The voltage must be observed even if
● There are variations in the line voltage, e.g. caused by different loads of
the power supply network,
● There are varying load states, such as short-circuit, normal load, lamp
load, or no load.
The maximum conductor cross-section for the voltage supply is 1.5 mm
NOTICE
An optimum grounding
is required to keep away possible interferences from the control and from the
Rexroth Inline terminals and to discharge them to the ground.
The top-hat rail on which the control is mounted must be mounted to a groun‐
ded metal carrier, e. g. the rear panel of the control cabinet.
A functional earth ground via the grounding screw is required to ensure opti‐
mum noise immunity. The grounding screw is positioned under the control
(see 10-27). The functional earth ground is to be connected via a cable,
which is as short as possible or, better, via a ground strip.
Bosch Rexroth AG
Mounting, Dismounting and Electrical Installation
1
2
)
LS
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
device and the grounding of the GND (U
load (PELV) at the power supply unit. This
causes a short-circuit in the device.
Production failure possible due to control fail‐
ure resulting from insufficient grounding.
41/65
PE PE
1.1 2.1
1.2 2.2
1.3 2.3
1.4 2.4
U
S
U
GND
LS
U
M
(U )
LS
GND (U U )
S , M
) in the
LS
)
LS
2 .