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Electrical installation
Earthing of the supply
8.3
Control circuit
8.3.1
Load current circuit
8.3.2
86
───
No fuses exist
The figure below is for illustration purposes only. No necessary
fuses exist or are pictured in the simplified illustration.
48V
GND
1
1
24V
2
1
2
1
3
3
2
1
4
4
3
2
1
EtherCAT
cable
The EN60204-1 standard, clause 9.4.3.1. Earth leakages stipulates
that 24 V
control circuits must be earthed. The earthing prevents
DC
the automatic start-up of a machine in the case of a cross-circuit.
Modules
R 24 V
I compensation = 0 A
R 48 V
Beckhoff recommends not to earth the 48 V power supply unit
on the secondary side
The 24 V
return line (0.75 mm
DC
If the 48 V power supply unit is earthed, the currents will be distrib-
uted to the 48 V
and 24 V
DC
pedances. Equalizing currents will then flow via the earth on the
power supply unit, as a result of which the 24 V
2
(0.75 mm
) could be overloaded.
Modules
R 24 V
I compensation =
(I 24 V + I 48 V) / 2
R 48 V
XTS
3
4
3
4
3
2
2
Supply line 3 x 2,5 mm / 2 x 0,75 mm
2
0,75 mm
I 24V
I 24V
2
0,75 mm
2
2,5 mm
I 48V
I 48V
2
2,5 mm
2
2,5 mm
2
) could be overloaded.
back wires in accordance with the im-
DC
2
2
Supply line 3 x 2,5 mm / 2 x 0,75 mm
2
0,75 mm
I 24 V
U 24 V
(I 24 V + I 48 V) / 2
2
0,75 mm
2
2,5 mm
I 48 V
U 48 V
(I 24 V + I 48 V) / 2
2
2,5 mm
2
2,5 mm
Version: 2.2
1
2
1
2
2
4
1
4
1
2
3
3
4
1
2
Power supplies
U
U 24 V
U
U 48 V
return line
DC
Power supplies
U
I compensation =
U
(I 24 V + I 48 V) / 2
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