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