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A.C. Power Mains
D.C. (floating
battery)
D.C. (grounded
battery)
I/O Station Supply Max. power output
3BSE 020 923R101
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Connection in
cabinet
Fuse
Connection of
network
Use of interference-
sensitive power
supply units
Internal distribution
Grounding, supply
Connection
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Phase
Return
Protective ground (if distributed)
There must be no breaks in the
I‚‡r)
protective ground conductor to the PE
terminal.
Incorporated in conductors
No unsuppressed load on same finale circuit
from distribution box
Special isolation transformer for electronics
supply must be used
Incoming power supply (110, 230V) must be
separated from other cables by 50 mm (2") or
more
Negative pole to neutral ground terminal of
cabinet directly at entry to cabinet. If
grounding of the battery is not permitted then
an isolating d.c./d.c. converter is required
Via isolated d.c./d.c. converter unless the
main d.c. power supply is grounded at the I/O
terminals
< 90% of regulator capacity
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57
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