Connecting and wiring hardware
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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.
WARNING: Loss of electrical safety when using unsuitable power supplies
The controllers are designed exclusively for operation with protective extra-low voltage
(PELV) in accordance with EN 60204-1. Only PELV in accordance with the listed stan-
dard may be used for the supply.
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 in accor-
dance with EN 50178 or EN 61010-2-201. These prevent short circuits between primary
and secondary sides.
A power supply without a fall-back characteristic curve must be used for the correct
operation of the controller (see Figure 5-2).
When the controller is switched on, an increased inrush current occurs briefly. When it is
switched on, the controller behaves like a capacitive load.
Figure 5-1 Overload range with fall-back characteristic
curve
Figure 5-2 Overload range without fall-back
characteristic curve
24
U
OUT
[V]
I
OUT
[A]
1.1 x I
N
2.4 x I
N
I
N
Overload range
with fall-back
characteristic curve
24
U
OUT
[ ]
V
I
OUT
[ ]
A
I
N
1.5 x I
N
Overload range
without fall-back
characteristic curve
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