Electronic - Pneumatic Injector Controller Pwa Circuit Description - Scion Instruments 436-GC Service Manual

436-GC/456-GC

Electronic - pneumatic Injector Controller PWA Circuit Description.

Description of the circuit.
The following functions exist on the board, with major components as indicated:
Function:
Digital Interface
Analog Interface
Diagnostics
Power Control
Flow Controller
Pressure Controller
Temperature Controller
Reference Voltage
Description of the Mercury EFC interface.
The Injector EFC bus is distributed via a 34 pin ribbon cable, which connects J8 on the main board to up to
three Injector EFC boards located inside the pneumatics compartment of the GC. J9 on the main board is
an identical interface that is intended to support up to three Detector EFC boards.
The signals on the Injector EFC bus are:
Digital Signals.
EFCA1
EFCA2
EFCA3
EFC1SEL
EFC2SEL
EFC3SEL
S2CLK
S2IN
S2OUT
SYSENAB
Analog Signals.
IEFCANLG
+5VREF
Ribbon cable pin assignments are as follows:
Pin#
1,2,17
3,4
10,11
5,6,9
7
12,13
18,19,20,21
15
14,16,23,24
22
8
25
26
27
28
29
30
31
32
33
34
SCION Instruments
Major Components:
U1,U2,U3,U4
U5,AR3
CR1,CR2,R38,R39,R44,R45
Q1,Q5,Q6,Q7,VR1
AR7,AR4,AR5,AR6,AR3,Q3
AR7,AR2,AR5,AR6,AR3,Q2
AR1,AR5,Q4
AR7,R50,C29,R3
Address bit
Address bit
Address bit
Module Select #1
Module Select #2
Module Select #3
Serial bus clock
Serial data to main board
Serial data from main board
System enable signal.
Multiplexed Analog Return signal.
+5.00 Volt Reference.
Signal
+15Volts Supply
-15 Volts Supply
+5.25 Volts supply
Analog Ground 2
IEFCANLG
-5Volt supply
+24Volt supply
Proportional Valve return ground
Digital/Power Ground
+5 Volt Digital supply
+5VREF
EFCA1
EFCA2
EFCA3
EFCA1SEL
EFCA2SEL
EFCA3SEL
S2CLK
S2IN
S2OUT
SYSENAB
436-GC/456-GC Service Manual Revision B February 2019
610 Hardware description
Page: 74