Connecting and wiring hardware
8482_en_03
PHOENIX CONTACT
43
5
Connecting and wiring hardware
5.1
Supply voltage
5.1.1
Sizing of the power supply
•
Choose a power supply unit that is suitable for the currents in your application. The se-
lection depends on the bus configuration and the resulting maximum currents.
Some electronically controlled power supplies have a fall-back characteristic curve (see
Figure 5-1). They are not suitable for operation with capacitive loads.
A
power supply without a fall-back characteristic curve
must be used for correct op-
eration of the controller (see Figure 5-2).
When the controller is switched on, an increased inrush current is temporarily triggered.
The controller behaves like a capacitive load when it is switched on.
WARNING: Loss of electrical safety when using unsuitable power supplies
The controller is designed exclusively for protective extra-low voltage (PELV) operation
according to EN 60204-1. Only PELV according to the defined standard may be used for
supply purposes.
The following applies to the network (PROFINET) and the I/O devices used in it:
•
Only use power supply units that meet EN 61204 with safe isolation and PELV ac-
cording to EN 50178 or EN 61010-2-201.
This prevents short circuits between primary and secondary sides.
Figure 5-1
Overload range
with
fall-back characteristic
curve
Figure 5-2
Overload range
without
fall-back charac-
teristic curve
24
U
O
U
T
[V]
I
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[A]
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9B
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1
.
1
x I
N
2
.
4
x I
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621
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24
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