GE VersaPoint IC220PB001, User Manual

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GFK-1911B Chapter 5 Power for the Station 5-5
5
Segment Circuit: U
S
A segment circuit or auxiliary circuit with segment voltage U
S
starts at the NIU or
at a supply terminal (power terminal or segment terminal). It is fed through all
subsequent modules as far as the next supply terminal.
NIU
Power Terminal
Segment Terminal
Function of U
S
You can use several segment terminals within a main circuit, and
therefore segment the main circuit. It has the same ground
reference as the main circuit. This means that circuits with
different fuses can be created within the station without external
wiring.
Voltage of U
S
24VDC maximum.
Current carrying
capacity of U
S
8A, maximum (total current with the main circuit). If the limit value
of a voltage jumper U
M
or U
S
is reached (total current of U
S
and
U
M
), a new power terminal must be used. (See summary of I/O
module current consumptions in this chapter).
The segment circuit supplies all modules that need to be separately switchable
from the main voltage e.g., on an emergency stop. This includes discrete input
modules without individual short-circuit protection, discrete output modules, and
auxiliary supply voltage for controlling power switches and contactors. The
segment circuit can be switched off or fused using the emergency stop or segment
terminals. It has the same ground reference as the main circuit. This means that
emergency stop circuits or circuits with different fuses can be created within the
station without external wiring.
Generation of U
S
There are various ways of providing the segment voltage U
S
:
1. You can supply the segment voltage at the NIU or at a power terminal.
2. You can tap the segment voltage from the main power at the NIU or a power
terminal using a jumper or a switch.
3. You can use a segment terminal and tap the segment voltage from the main
power.
With 120V and 230V voltage levels, segments cannot be created. In this
case, only the main circuit is used.