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Manual 03554 GECO

Stoichiometric
Woodward 3
GECO

Stoichiometric Control Specifications
Power
Supply
Power Supply Operating Voltage: 19.2–28.8 Vdc (24 Vdc nominal) (GECO
Vista model)
9.0–30.0 Vdc (12 Vdc or 24 Vdc nominal)
(GECO Stoichiometric model)
Power Supply Rated Voltage: 19.2–28.8 Vdc (class 2) (GECO Vista
model)
8–32 Vdc (GECO Stoichiometric model)
Power Consumption: 83 W maximum (application specific)
(GECO Vista model)
70 W maximum (application specific)
(GECO Stoichiometric model)
Inputs: 2 Unheated Zirconia Exhaust Oxygen
Sensors (EGO) (0–1 Vdc), p/n 6910-315 or
equivalent
1 Heated Zirconia Exhaust Oxygen Sensor
(HEGO) (0–1 Vdc), p/n 6910-316 or
equivalent
2 K-type Thermocouples, p/n 1736-919 or
equivalent
1 Intake Manifold Absolute Pressure Sensor
(0–5 Vdc; 0–3 bar absolute), p/n 6910-314
1 Differential Pressure Sensor(1–5 Vdc;
0–15“ H
2
O)
1 Magnetic Pickup, p/n 5430-929 or
equivalent (0.20–100 Vrms; 8–10 000 Hz)
1 “G-lead” pulse from ignition system (±250
V max)
Outputs: 2 PWM Fuel Metering Valves, p/n 1310-923
1 Alarm Relay (Solid State relay Form C;
250 V @ 75 mA max non-inductive load)
1 Shutdown Relay (Solid State relay Form
C; 250 V @ 75 mA max non-inductive load)
Diagnostics: Power Supply Voltage
Oxygen Sensor Health
Oxygen Sensor Heater Circuits
Manifold Pressure Sensor
Closed-Loop Functions
Catalyst Differential Pressure
Catalyst Temperature
Control
Failsafe
Operating Modes: Pre-catalyst exhaust oxygen closed loop
control on failure of post-catalyst oxygen
sensor
Open loop valve positioning mode on failure
of pre-catalyst exhaust oxygen sensor
Valve default position on failure of manifold
pressure sensor
Communications: RS-232 Hand-Held Interface 6-Pin RJ-12
RS-232 PC Interface DB9F
RS-485/Modbus Slave Data Transmission