Phoenix Contact AXL SE PSDI8/3, Original Operating Instructions, Page: 14 / 84

AXL SE PSDI8/3
14 / 84
PHOENIX CONTACT 108928_en_02
3.4 Supply voltages
A Smart Element requires the following supply voltages:
– Communications power U
SE
of the Smart Element
– I/O supply voltage U
P
The Smart Element receives both supply voltages via the Smart Element interface.
Technical data

See “Communications power of the Smart Elements (U
SE)” on page 77
.

See “I/O supply U
P” on page 77
.
3.4.1 Power supply requirements
PELV power supply • Only use power supply units with safe isolation and SELV/PELV in accordance with
EN 50178/VDE 0160.
• Make sure that the output voltage of the power supply does not exceed 32 V even in the
event of an error.
Fuse protection for the
power supply
• Protect the power supply with a suitable external fuse.
• Make sure that the power supply unit is able to supply four times the nominal current
of the external fuse. This ensures that the fuse trips reliably in the event of an error.
3.4.2 Integration of the Smart Elements in the Axioline F system
When integrating Smart Elements in an Axioline F station using an Axioline F backplane:
• Supply the bus head with communications power U
L
From here, the U
Bus
communications power for the local bus and the U
SE
communica -
tions power for the Smart Elements are generated.
• Supply the Axioline F backplane with voltage U
P
The backplane provides the Smart Elements with this I/O supply voltage.
WARNING: Loss of the safety function
The use of unsuitable power supplies can result in the loss of the safety function.
Observe the additional information and technical data in the documentation for the follow -
ing components:
– Axioline F product range
– Backplane used
– Bus coupler used
See
“Documentation for the product range” on page 10 .