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Electrical installation
Earthing of the supply
8.3
Control circuit
Load current circuit
74
───
No fuses exist
The figure below is for illustration purposes only. No necessary
fuses exist or are pictured in the simplified illustration.
The EN60204-1 standard, clause 9.4.3.1. Earth faults stipulates that
24 V
control circuits must be earthed. The earthing prevents the
DC
automatic start-up of a machine in the case of a cross-circuit.
I compensation = 0 A
Beckhoff recommends that you don't earth the 48 V power
supply unit
The 24 V
return line (1.5 mm
DC
If the 48 V power supply unit is earthed, the currents will be distrib-
uted to the 48 V
pedances. Equalizing currents will then flow via the earth on the
power supply unit, as a result of which the 24 V
2
(1.5 mm
) could be overloaded.
eXtended Transport System
Modules
Supply line 3G 4 mm² / 2 x 1,5 mm²
I 24 V
R 24 V
I 24V
I 48 V
R 48 V
I 48V
2
) could be overloaded.
and 24 V
back wires in accordance with the im-
DC
DC
EtherCAT cable
Power supplies
1,5 mm²
U
U 24 V
1,5 mm²
4 mm²
U
U 48 V
4 mm²
4 mm²
return line
DC
Version: 1.0
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