IndraControl L40
Installation and Maintenance
8-13
DOK-CONTRL-IC*L40*****-PR03-EN-P
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 a SELV circuit. Please note that any
additionally connected equipment might also cancel the non-grounded
setup.
L1
L2
L3
N
PE
U
M
U
S
U
LS
GND
GND (U
S
,
U
M
)
FE
24 V
24 V
0 V
+
0 V
+
E1
E2
Bezugnichtverbunden.FH9
Fig. 8-10:
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 earth 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.
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