Siemens ST950 Plus+ - Page 63

ST950 Plus+ User Manual
ST950 Plus+ User Manual
Page 63 of 176
667/HE/53000/000
Issue 2
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3.16.10 CIC/CTB Interfaces: ZXO Input
The ZXO or Zero Crossing input is connected to the secondary of a toroidal transformer. The CIC
processes the AC waveform from this transformer to produce timing signals where the AC
waveform crosses 0V. These timing signals are used by the system for confirmation of the system
clocks.
3.16.11 CIC/CTB Interfaces: Logic Supply Distribution (+24V DC)
The 24V logical supply is sourced from a DIN rail mounted PSU located on the left panel of the
cabinet. This connects to the first CIC/CTB at PL18 ‘24V DC PSU’. The connector details are as
follows:
The first CIC/CTB provides 24V DC power to the ST950 CPU card via PL5 (‘RLYA & RLYB Molex
connector) and the GSPI IN connectors.
Subsequent CIC/CTBs receive their 24V DC power from the first CIC/CTB via the GSPI and
Consolidated Relay connections see Figure 31 below.
1
st
Cabinet
Interface Card
1
st
Cable
Termination
Backplane
24V
In
2nd Cabinet
Interface Card
2
nd
Cable
Termination
Backplane
On Street Wiring
24V
In
3rd Cabinet
Interface Card
3
rd
Cable
Termination
Backplane
24V
In
To 24V PSU
To 1
st
CIC of
adjacent
cabinet if fitted
GSPI
In
RJ45
GSPI
Out
RJ45
Relay
Int
Molex
GSPI
In
RJ45
GSPI
Out
RJ45
GSPI
In
RJ45
GSPI
Out
RJ45
Relay
In
RJ45
Relay
Out
RJ45
Relay
In
RJ45
Relay
Out
RJ45
Relay
In
RJ45
Relay
Out
RJ45
To 1
st
CIC of
adjacent cabinet if
fitted or to optional
serial I/O cards if
last CIC in system
Relay
Int
Molex
Relay
Int
Molex
To ST950
On Street Wiring On Street Wiring
To ST950
Figure 32 24Vdc Routing Via CTB
Pin
Legend
Function
1
AC IN1
ZXO AC In (Red)
2
GND
ZXO AC In (Yellow)
3
NC
No Connection
Pin
Legend
Function
1
+24V OUT
Not currently used.
2
+24V IN
+24V DC in from the DIN rail mounted PSU
3
GND
0V Return for the +24V DC PSU
4
GND
0V Return for the +24V DC PSU