Fig. 8-8: Reference Conductor Not Connected To The Protective Conductor - Bosch Rexroth IndraControl L40 Project Planning Manual

IndraControl L40
L1
L2
L3
N
PE
24 V
0 V +
E1
E2
DOK-CONTRL-IC*L40*****-PR02-EN-P
IAS COMPONENTS www.ias-components.com info@ias-components.com
Reference Conductor Not Connected to the Protective
Conductor
If the reference conductor (N, 0 V) is not connected to the protective
conductor system, then an appropriate ground fault detector must be
used to prevent inadvertent power-up in case of insulation faults. Hence,
the supply current circuit is an SELV circuit. Please note that any
additionally connected equipment might also cancel the non-grounded
setup.
24 V
0 V +
Fig. 8-8: Reference conductor not connected to the protective conductor
Programming Device and Ground Connection
Programming devices are almost always provided with a connection
between the ground and the functional ground. This connection might
give rise to problems if the voltage supply of the IndraControl L40 is
provided with a ground fault detector and the programming device is
connected to the IndraControl L40. Owing to the non-isolated power
supply unit assembly, the ground fault in the programming device has an
effect on the ground fault detector via the central processing unit and the
power supply unit assembly. In this case, the detector should not
deactivate the system automatically, but only indicate the ground fault.
Maintenance staff should be aware of this fact.
Installation and Maintenance
U
GND
LS
GND (U U
,
S
Bezugnichtverbunden.FH9
8-11
FE
U
S
U
M
)
M