Connecting up
6.5 Connecting a power supply adapter
SCALANCE W786-x
Operating Instructions, 11/2014, A5E03678337-07
45
NOTICE
Exceeding the EMC limit values
SCALANCE W786 with RJ-45 interface with DC power supply adapter or without power
supply adapter
When using a SCALANCE W786 with RJ-45 connector without a power supply adapter or
with a DC power adapter, no additional measures are necessary for use in a residential
environment.
SCALANCE W786 with RJ-45 interface with AC power supply adapter PS791-2AC
When using a SCALANCE W786 with a power supply adapter PS791-2AC (100 to 240
VAC), the requirements for use in an industrial environment are met without any additional
measures being necessary.
When used in a residential environment, noise produced by this configuration can be
reduced by fitting an EMC ferrite (a snap ferrite) to the power supply cable as close as
possible to the power supply adapter.
If you use the power supply adapter PS791-2AC (100 to 240 V AC voltage) in a domestic
area (EMC class B), fit an EMC ferrite (a snap ferrite) to the supply cable as close as
possible to the power supply adapter. This measure is unnecessary in an industrial
environment.
You can order suitable ferrites from the following company:
Würth Elektronik eiSos GmbH & Co. KG
Max-Eyth-Strasse 1-3; 74638 Waldenburg, Germany
Model designation: STAR-TEC with safety key technology
cable diameter 6 – 7.5 mm, order number: 74271131
Cable diameter 7 - 8.5 mm, order number: 74271132
Applies only to the power supply adapter PS791-2AC (100 to 240 VAC)
WARNING
Danger from line voltage
The strain relief clamp may damage the insulation under unfavorable circumstances. You
run the risk of encountering danger from line voltage through the strain relief clamp.
For a line with 100 to 240 VAC use an insulated strain relief clamp only; this ships with the
power supply adapter.