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Woodward GECO Technical Manual

Stoichiometric gas engine controls
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Technical Manual 03554
(Revision D)
Original Instructions
GECO™& GECO Vista
Stoichiometric Gas Engine Controls
Air/Fuel Ratio Control
for Emissions-controlled, Stationary Gas Engines
Installation and Operation Manual

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Summary of Contents for Woodward GECO

  • Page 1 Technical Manual 03554 (Revision D) Original Instructions GECO™& GECO Vista Stoichiometric Gas Engine Controls Air/Fuel Ratio Control for Emissions-controlled, Stationary Gas Engines Installation and Operation Manual...
  • Page 2 Revisions—Text changes are indicated by a black line alongside the text. Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is believed to be correct and reliable. However, no responsibility is assumed by Woodward unless otherwise expressly undertaken.

  • Page 3: Table Of Contents

    L-Series Trim Valve Environmental Specifications ..........4   2. S ......... 5  HAPTER YSTEM ESCRIPTION AND PPLICATION GECO™Stoichiometric Air/Fuel Ratio Control ............5   Pre-Catalyst Exhaust Oxygen Control ..............6   Post-Catalyst Exhaust Oxygen Control ..............6   EGO3 Offset ......................7  ...
  • Page 4   8. I ............. 52  HAPTER NSTALLATION ETUP Installation Tasks ....................52   Included GECOStoichiometric Components ............52   Optional GECOStoichiometric Components ............52   Required Installer-Provided Components ............53   Optional Installer-Supplied Components .............. 53   Unpacking ......................53  ...
  • Page 5 Figure 2-9. PC Communications ................10   Figure 2-10. PC Software Tool Display Screen Example ........10   Figure 2-11. GECO System for Single Carburetor Engine ........11   Figure 2-12. GECO System for Dual Carburetor Engine ........12  ...

  • Page 6: Regulatory Compliance

    Wiring must be in accordance with North American Class I, Division 2 wiring methods as applicable, and in accordance with the authority having jurisdiction. On GECO Vista models, input power must be supplied from an NEC or CEC class 2 power source.

  • Page 7: Electrostatic Discharge Awareness

    PCB from the control cabinet, place it in the antistatic protective bag. To prevent damage to electronic components caused by improper handling, read and observe the precautions in Woodward manual 82715, Guide for Handling and Protection of Electronic Controls, Printed Circuit Boards, and Modules.
  • Page 8 GECOStoichiometric Manual 03554 Woodward...

  • Page 9: Chapter 1. General Information

    Chapter 1. General Information Welcome! This manual describes the GECO™and GECO Vista Stoichiometric controls. The GECOStoichiometric control provides precise air/fuel ratio control for engines using three way catalytic converters to reduce exhaust emissions. It is a more sophisticated exhaust oxygen feedback control system because it includes continuous oxygen sensor diagnostics, catalyst over-temperature &...

  • Page 10: Definitions Of Terms And Abbreviations

    GECOStoichiometric Manual 03554  Plug-in terminal strip connectors for ease of installation  CSA Listed for Class I, Division 2, Groups A, B, C, and D in Canada and US *—Modbus is a registered trademark of Schneider Automation Inc. Definitions of Terms and Abbreviations Atmosphere (pressure), 14.7 psia...

  • Page 11: GecoStoichiometric Control Specifications

    Manual 03554 GECOStoichiometric 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)

  • Page 12: Environmental Specifications

    Manual 03554 Environmental Specifications Temperature Ranges: Ambient Operating Temperature: 0 to +40 °C (+32 to +104 °F) (GECO Vista model) –40 to +70 °C (–40 to +158 °F) (GECO Stoichiometric model) Storage Temperature: –40 to +105 °C (–40 to +221 °F)

  • Page 13: Chapter 2. System Description And Application

    The exhaust gas oxygen sensor (EGO) will generate a voltage signal that is characteristic of this ideal stoichiometric window. The GECO control will use this voltage value to keep the engine at this correct air/fuel ratio. For natural gas this voltage is usually around 0.780 V.

  • Page 14: Pre-Catalyst Exhaust Oxygen Control

    Figure 2-2. Pre-Catalyst Emissions Figure 2-3. Post-Catalyst Emissions Pre-Catalyst Exhaust Oxygen Control The GECO control increases or decreases the fuel flowing through the supplementary fuel system to hold the EGO1 (and EGO2 if present) sensor voltage at this target value.

  • Page 15: Ego3 Offset

    The required adjustment can be entered into the EGO3 Offset table in the GECO control so that it can adjust the EGO3 Base value by adding the offset to the base value at different loads. The GECO control keeps track of engine load by monitoring the intake manifold pressure (MAP) and engine speed (MPU).

  • Page 16: Open Loop Control Mode

    GECOStoichiometric Manual 03554 Open Loop Control Mode The open loop control mode will control the air/fuel ratio of the engine without the closed loop EGO measurement. This mode is less accurate than the closed loop mode but it is more accurate than the carburetor alone. This mode positions the fuel control valve to predetermined values based on the load of the engine.

  • Page 17: Fuel Valve Dithering

    There is an alarm and shutdown LED output as well as an alarm and shutdown relay. In addition, the GECO control has oxygen sensor health monitoring. This function can assess the remaining activity of the oxygen sensors, and preventative maintenance can be planned before a sensor failure occurs.

  • Page 18: Modbus Communication

    Figure 2-9. PC Com mmunications 1 GECO Stoic chiometric Air/Fuel Co ontrol Moni tor ID:5455 5-111-NW 200 01/05/15 ╔═En gine═══════ ═══════════╦...

  • Page 19: System Diagram Examples

    Manual 03554 GECOStoichiometric System Diagram Examples Figure 2-11. GECO System for Single Carburetor Engine Woodward...

  • Page 20: Figure 2-12. Geco System For Dual Carburetor Engine

    GECOStoichiometric Manual 03554 Figure 2-12. GECO System for Dual Carburetor Engine Woodward...

  • Page 21: Chapter 3. System Components

    Manual 03554 GECOStoichiometric Chapter 3. System Components Circuit Board Panel Assembly [P/N 9907-867] The circuit board includes the microprocessor control and all associated electronics for power regulation, signal inputs and filtering, controlled outputs, and communications. All system connections are made directly to the board through plug-in terminal strips and connectors.

  • Page 22: Hand-Held Terminal

    C (32 to 122 °F Storag ge Temperatur –40 to +8 5 °C (–40 to +1 185 °F) EXPLOSION HAZARD—T The GECO en nclosure sho ould not be o opened when a hazar rdous atmos sphere is pre sent. Wiring...

  • Page 23: Figure 3-1. Mounting Dimensions

    Manual 03554 GECOStoichiometric There are no knockouts or pre-cut conduit openings in the enclosure. All four sides of the box are free of obstruction and available for conduit entry. We recommend locating knockouts in the bottom of the box. It is highly recommended that the circuit board be removed from the enclosure before conduit openings are added—this can be accomplished by removing the four...

  • Page 24: Fuel Control Valve For Supplementary Applications

    The valve has a 0.5 inch (13 mm) conduit fitting with 12” long (300 mm) 22 AWG (0.3 mm²) lead wires: red is positive, black is negative. Command The position command from the GECO control is a 500 Hz, 0–20 V, pulse width modulated signal (PWM). Woodward...

  • Page 25: Figure 3-3. Valve Outline Drawing

    Manual 03554 GECOStoichiometric Mounting The valve housing has four 6.9 mm (0.27 inch) through-holes in a square 41.1 mm (1.62 inch) pattern for mounting. Figure 3-3. Valve Outline Drawing The gas inlet is a 0.25 inch (6.4 mm) NPT threaded fitting and the outlet is 3/8 inch (9.5 mm) NPT.

  • Page 26: Fuel Control Valve For Full-Flow Applications

    The L-Series valve is configured to operate with the GECO out of the box, and a PC Service Tool is included to configure the valve for additional fault and positioning features. Fuel supply pressure to the valve can be 0–30 psia.

  • Page 27: Exhaust Gas Oxygen (Ego) Sensor

    This type of sensor will generally have two leads—one for the sensor signal and the other for signal ground. The Woodward part number for the mating connector is 8928-399. Connector Wiring: Terminal...

  • Page 28: Map Sensor

    12047948 Crimp Terminals 12048074 Cable Seals 12048086 For convenience, Woodward part number 8928-427 is a kit that provides all the necessary Packard components. View shown is looking into HEGO connector Figure 3-4. HEGO Sensor Connector Pin Arrangement MAP Sensor [P/N 6910-314] The Manifold Absolute Pressure sensor (MAP) is used by the control to measure the intake manifold pressure.

  • Page 29: Pc Service Tool Software

    “G-lead” input; terminals 49 and 50 are the MPU inputs. Status Indicator LEDs If the operator wishes to install LED lights for GECO control power, alarm, and shutdown (with or without the alarm and shutdown relay outputs), the circuit board also includes a 6-pin connector specifically for indicator LEDs.

  • Page 30: Led Wiring Diagram

    The LEDs can be connected as in the wiring diagram above. Also, you can check with your GECO distributor for availability of pre-wired, panel-mounted LED modules that include a DB9 connector for a PC, or an RS12 connector for the hand-held terminal.

  • Page 31: Chapter 4. Control Operation

    Figure 4-1. Pre-Catalyst EGO Closed Loop Control Mode Diagram The GECO PC Tool will display the EGO feedback value in the form of a DC voltage between 0 and 1 V. This value is labeled “EGO unfiltered”. It is a “noisy”...

  • Page 32: Figure 4-2. Adaptive Ego Closed Loop Control Mode Diagram

    EGO signal. Unfortunately, the increased feedback delay from a downstream sensor alone would make the response of the fuel control too slow. The GECO system solves these limitations with the use of both upstream and downstream oxygen sensor feedback.

  • Page 33: Open Loop Strategy

    Open loop means that the closed loop feedback signal is not used or is not available. In the case of the GECO  Stoichiometric control, if the EGO1 or EGO2 feedback signals are not available, the control operates in open loop mode.

  • Page 34: Modbus Communication

    Modbus Communication The GECO  Stoichiometric control can serve as a Modbus “slave” unit and will respond to requests for information from a properly programmed “master.” The table below gives some examples of the parameters available. A complete list is available in the Appendix.
  • Page 35 Manual 03554 GECOStoichiometric Example of Modbus Register List Address Analog Description Address Boolean Description Engine speed MAP1 voltage high alarm Intake manifold pressure Battery voltage high alarm Cold junction (control) temperature MAP voltage low alarm Closed loop control value - bank 1...

  • Page 36: Chapter 5. Hand -Held Terminal Operation

    GECO™  Sto oichiometric co ontrol. The m main uses to review cur rrent operating g conditions a and check for a any previous faults.

  • Page 37: Hand-Held Terminal Control Screens

    If the fault condition is still present, the fault indication will immediately return. Hand-Held Terminal Control Screens 1.) On system power-up, the red power indicator light on the GECO circuit board will GECO Stoichiometric illuminate and the hand-held terminal will Air/Fuel Ratio boot up with the title screen.
  • Page 38 GECOStoichiometric Manual 03554 4.) This screen shows faults associated with the exhaust gas oxygen sensor signals or Hi Hth Hi Lo control which depends on EGO feedback. An EGO1:OK OK VL1:OK OK EGO Hi fault indicates a signal voltage higher...

  • Page 39: Hand-Held Terminal Configuration Screens

    Manual 03554 GECOStoichiometric 8.) Additional operator information is included in this screen. The engine speed, engine XXXX Ctl1 ADPT mode, and run time since the last control Mode Ctl2 OPEN power-up are displayed. The power supply XXXX Tcup XXXX voltage is shown as DCPwr. CTL1 and CTL2 DCPwr XX.X...

  • Page 40: Hand-Held Programmer Configuration

    GECO circuit board. The first screen displays “Contrast.” The 1 key will increase, and the 2 key will decrease the LCD display contrast. The 3 key accepts the current value.

  • Page 41: Pc Interface Software Operation

    1. With a DB9 male to DB9 female RS-232 cable, connect the on-line control DB9 female RS-232 port to the PC DB9 serial port. 2. Using the Start menu, go to Programs and find the newly created GECO PC Service Tool shortcut.
  • Page 42 The PgUp and PgDn (page up and page down) keys are used to toggle through each individual screen. Screens 2, 3, and 4 require password access (contact your GECO distributor for more information). The interface screens also show a reverse-color cursor highlighting the current configurable variable. This cursor is moved to other variable locations with the arrow keys on the PC keyboard.
  • Page 43 Manual 03554 GECOStoichiometric Screen 2: GECO  Stoichiometric Air/Fuel Control Configuration (password protected) Screen 3: GECO  Stoichiometric Air/Fuel Control Calibration (password protected) Woodward...
  • Page 44 GECOStoichiometric Manual 03554 Screen 4: GECO  Stoichiometric Adaptive Air/Fuel Calibration (password protected) The following is an explanation of the individual screen frames: Screen 1: Engine Speed : Engine rpm from magnetic pickup (MPU) or “G-lead”. (This value defaults to...
  • Page 45 Manual 03554 GECOStoichiometric This frame shows the status of the input fault detection function: Screen 1: Shutdowns ClearAll : Clears all shutdown faults. TC Upstream : OK/SHUTDN/clear Shutdowns shutdown. ClearAll High TC Dnstream : OK/SHUTDN/clear TC Upstream shutdown. If exhaust temperature...
  • Page 46 GECOStoichiometric Manual 03554 Screen 1: Fuel Control Alarms [See Troubleshooting section for description of fault causes] ClearAll : Clears all alarm faults Valve1 Limit : Fault sets when the Fuel Control Alarms CL valve commands reach their ClearAll High limit without bringing the EGO Valve1 Limit signal to its target.
  • Page 47 Manual 03554 GECOStoichiometric Screen 2: MAP Calibration Unscaled : Raw MAP input voltage MAP Calibration Scaled : Manifold Absolute Pressure in Unscaled 0.00 psia. Scaled 0.35 psia Offset : The offset applied to the MAP Offset +0.039 voltage input and is the low-end Span 8.939 psi/V...
  • Page 48 GECOStoichiometric Manual 03554 Screen 2: Fault Enables All faults configurable: Fault Enables alarm ENABLED/DISABLED EGO max voltage ENABLED alarm and shutdown EGO health ENABLED ENABLED+SD/DISABLED TC open ENABLED TC lower expect ENABLED EBP low ENABLED EBP high ENABLED EBP higher expect ENABLED...
  • Page 49 Manual 03554 GECOStoichiometric Screen 2: Modbus Configuration Mode : ASCII, RTU, or OFF. ModBus Configuration Parity : EVEN, ODD, or NONE. Baud : 1200, 2400, 4800, 9600, or Mode 19200. Choice of possible Parity NONE communication baud rates. Baud 9600 Address Address : 0-247.
  • Page 50 GECOStoichiometric Manual 03554 Screen 3 Oxygen Sensors Engine-Out Cat-Out Bank1 Bank2 Bank1+2 (EGO3) EGO unfilt 0.642 0.656 0.675 volts EGO filter 0.618 0.661 0.698 volts EGO target 0.600 0.600 0.712 volts EGO health Adaptive +2.10% Valve Cmd +33.00 +65.00% Valve Cur 0.41...
  • Page 51 Manual 03554 GECOStoichiometric Screen 4: Calibration Speed : Engine rpm from magnetic pickup Speed 1200 rpm (MPU) or “G-lead”. (This value defaults to 22.32 psia 1350 if the Digital In RUN signal is used). MAP : Intake manifold absolute pressure EGO3 Base 0.712 volts...
  • Page 52 GECOStoichiometric Manual 03554 Valve-Learn % : The learned fuel valve position commands that the control will use in the event that OPEN LOOP mode is activated for any reason. A position is learned for each load point represented by the Mdot Fuel values above. New values are learned only when the engine is operating in a steady state and the K_Valve_Learn is greater than zero.

  • Page 53: Plotting And Data Logging

    GECO  Stoic chiometric int erface softwa are. Up to six variables ma e selected wit h the cursor a and the T (Ta ag) key.

  • Page 54: Chapter 7. Geco™ Vista Hmi Display

    99. The screen also provides for limited historical and real-time trending coupled with diagnostic monitoring to allow full utilization of the GECO Vista AFR control. The screen firmware can be modified to meet your specific needs such as activating the V-bank Main screen (Figure 7-4) and is...

  • Page 55: Main Screen

    Manual 03554 GECOStoichiometric Main Screen The Main screen allows access to the key operating information such as engine speed, manifold pressure, catalyst health, and control status. Figure 7-3. GECO Vista Main Screen Figure 7-4. GECO Vista V-Bank Main Screen Woodward...

  • Page 56: Alarm Screen

    The faults are not permanently logged and will drop out when the reset button is pressed. Figure 7-5. GECO Vista Alarm Screen Trend Screen The Trend screen displays a real-time rolling chart of the key closed-loop values.

  • Page 57: Diagnostic Screen

    PC Service Tool. Figure 7-7. GECO Vista Diagnostic Screen HMI Display Offline Mode The HMI display can be placed in OFFLINE mode to set the current time and date.
  • Page 58 GECOStoichiometric Manual 03554 When operating the unit: Touch either the upper right and lower left corners, or the upper left and lower right corners (within 40 pixels of the edges) of the panel screen in this order within 0.5 seconds The System Menu will be displayed, touch the “Offline”...

  • Page 59: Hmi Screen Brightness Adjustment

    Manual 03554 GECOStoichiometric HMI Screen Brightness Adjustment This mode must be entered during Run mode only. Touch either the upper right and upper left corners, or the upper left and upper right corners(within 40 pixels of the screen edge) within 0.5 seconds.

  • Page 60: Chapter 8. Installation/Setup

    Manual 03554 Chapter 8. Installation/Setup The GECO™  Stoichiometric system installer should be able to perform the following tasks with a high level of quality and workmanship, with consideration given to any applicable laws and regulations for the specific location.

  • Page 61: Required Installer-Provided Components

    GECOStoichiometric Required Installer-Provided Components  9–30 Vdc power supply, 70 W for the control (for GECO Stoichiometric)  19.2–28.8 Vdc (class 2) power supply, 83 W for the control (for GECO Vista model)  Electrical conduit  Wiring as shown in the plant wiring diagrams ...

  • Page 62: Control Location Considerations

    –40 to +7 70 °C (–40 o +158 °F) (fo r GECO Stoic chiometric Mo odel) or 0 o +40 °C (+32 2 to +104 °F) ( (for GECO Vi ista Model)

  • Page 63: Class I, Division 2, Groups A, B, C, D Hazardous Locations

    Any new alarm and shutdown wiring for the operator control panel such as switches, lights, horn, or gages should also be installed at this time. The GECO enclosure should be properly connected to earth ground.
  • Page 64 Separate the inner conductor(s) from the shield. If the shield is the braided type, twist it to prevent fraying.  Remove 6 mm (1/4 inch) of insulation from the inner conductors for GECO plug-in terminals. Installations with severe electromagnetic interference (EMI) may require additional shielding precautions.
  • Page 65 Manual 03554 GECOStoichiometric Woodward...

  • Page 66: Figure 8-2. Wiring For Single Bank

    GECOStoichiometric Manual 03554 Figure 8-2. Wiring for Single Bank Woodward...
  • Page 67 Manual 03554 GECOStoichiometric Woodward...

  • Page 68: Figure 8-3. Wiring For Dual Bank

    GECOStoichiometric Manual 03554 Figure 8-3. Wiring for Dual Bank Woodward...

  • Page 69: Figure 8-4. Legend Plate

    Manual 03554 GECOStoichiometric Figure 8-4. Legend Plate Woodward...

  • Page 70: Status Indicator Leds

    Manual 03554 Status Indicator LEDs If the operator wishes to install lights for GECO control power, alarm, and shutdown (with or without the alarm and shutdown relay outputs), the circuit board also includes a 6-pin connector specifically for indicator LEDs.

  • Page 71: Updating Application Programming (.S19 File)

    From any screen, type Alt-D (hold the Alt key and press D at the same time).  An input message at the bottom of the screen will request the password included with the update software. Contact your GECO distributor for more information. ...

  • Page 72: Ego Installation

    GECOStoichiometric Manual 03554  An automatic shut-off for engine shutdown is required upstream of the pressure source; when the control loses the engine speed signal, the trim valve(s) will close automatically as a backup.  The injection point should be chosen to provide as much mixing as possible before the intake splits to individual cylinders;...

  • Page 73: Hego Installation

    Manual 03554 GECOStoichiometric HEGO Installation  Location of downstream HEGO sensor should be:  In the exhaust stream after the catalyst.  As close to the catalyst as possible.  As far from exhaust outlet as possible; ambient air reversion from the exhaust pulses or air leaks in the exhaust pipe can cause false lean signals.

  • Page 74: Supplemental Valve Installation Diagrams

    GECOStoichiometric Manual 03554 Excessive oil consumption by the engine will also affect oxygen sensor life— regular maintenance of piston rings (and valve seals, where applicable) is very important. Although the sensors are inexpensive, they are damaged by the same contaminants that will eventually poison the exhaust catalyst. In other words, a sensor failure may give warning that maintenance is needed before the catalyst is also damaged.

  • Page 75: Full-Flow Valve Installation Diagrams

    Manual 03554 GECOStoichiometric Full-flow Valve Installation Diagrams Figure 8-6. L-Series ITB Outline Drawings Woodward...

  • Page 76: Configuration And Calibration

    GECOStoichiometric Manual 03554 Configuration and Calibration These instructions assume that the engine is in good operating condition and the mechanical carburetor has been properly installed and calibrated. Control Configuration Before Engine Start 1. Apply power to the control. 2. Connect a Windows compatible computer to the control via the RS-232 cable.
  • Page 77 Manual 03554 GECOStoichiometric 11. Ramp the engine load up to the 100% power. Record the current Mdot_fuel value. Enter this value into the last point of the Valve-Learn table. 12. Enter evenly distributed Mdot_fuel values into the remaining points of the Valve-Learn table between 50% and 100%.

  • Page 78: Chapter 9. Maintenance And Fault Indications

    Excessive engine oil consumption can also cause these effects over longer periods of time. The GECO  Stoichiometric system will relieve the operator of constant carburetor tuning for emissions compliance, but consistent engine maintenance is still required.

  • Page 79: Troubleshooting

    GECOStoichiometric Troubleshooting The diagnostic functions of the GECO  Stoichiometric system are reported to the user either through the hand-held interface or the PC interface software. Certain faults can also cause alarm or shutdown conditions, if these systems have been configured and integrated into the existing engine control panel.
  • Page 80 GECOStoichiometric Manual 03554 Valve Limit Low and High: Fluctuating fuel supply pressure Fuel metering valve Carburetor not tracking well Low authority due to low pressure and rich carburetor settings Adaptive Limit Low: Downstream EGO3 health Fuel metering valve Set EGO Base lower to re-center adaptive authority “window”...

  • Page 81: Recommended Spare Parts

    Do not disconnect while circuit is live unless area is known to be non-hazardous. The GECO control must not be operated with the hand held terminal connected to the control when a hazardous atmosphere is present. RPM Signal Issues The control will follow several different control strategies depending on the engine speed signal.

  • Page 82: Chapter 10. Service Options

    Woodward systems and components for the retrofits and overhauls, long term service contracts, emergency repairs, etc. You can locate your nearest Woodward distributor, AISF, RER, or RTR on our website at: www.woodward.com/directory.aspx...

  • Page 83: Woodward Factory Servicing Options

    Flat Rate Remanufacture: Flat Rate Remanufacture is very similar to the Flat Rate Repair option with the exception that the unit will be returned to you in “like- new” condition and carry with it the full standard Woodward product warranty (Woodward Product and Service Warranty 5-01-1205). This option is applicable to mechanical products only.

  • Page 84: Replacement Parts

    Engineering Services Woodward offers various Engineering Services for our products. For these services, you can contact us by telephone, by email, or through the Woodward website.  Technical Support ...

  • Page 85: How To Contact Woodward

    Manual 03554 GECOStoichiometric How to Contact Woodward For assistance, call one of the following Woodward facilities to obtain the address and phone number of the facility nearest your location where you will be able to get information and service. Electrical Power Systems...

  • Page 86: Appendix . Modbus Register Addresses

    GECOStoichiometric Manual 03554 Appendix. Modbus Register Addresses Integer Input/Output Parameters Parameter Parameter Internal Multiply Then Name Description Units Obtain Engine speed [16.0] rpm Intake manifold pressure - bank 1 [8.8] psia 0.00390625 psia Catalyst Differential Pressure [8.8] inH2Od 0.00390625 inH2Od Cold junction (control) temperature [13.3] deg F...
  • Page 87 PROM_ID11 UNUSED integer integer PROM_ID12 HCN - Hardware compatibility number integer integer PROM_ID13 SCN - Software compatibility number integer integer WGC SCN - Woodward software PROM_ID14 compatibility number integer integer PROM_ID15 GECO Model number integer integer 2-byte PROM_ID16 Revision code...
  • Page 88 GECOStoichiometric Manual 03554 Boolean Input/Output Parameters Parameter Name Parameter Description Clear 0 MAP1_HIGH_AL MAP voltage high alarm FAULT 6 BAT_HIGH_AL Battery voltage high alarm FAULT 0 MAP1_LOW_AL MAP voltage low alarm FAULT 6 BAT_LOW_AL Battery voltage low alarm FAULT 2 TC2_LOW_EXP_AL TC2 lower than expected alarm...
  • Page 89 Manual 03554 GECOStoichiometric Boolean Input/Output Parameters Parameter Name Parameter Description Clear INJ2_LOW_AL Injector driver 2 current low alarm FAULT INJ1_LOW_AL Injector driver 1 current low alarm FAULT INJ2_HIGH_AL Injector driver 2 current high alarm FAULT INJ1_HIGH_AL Injector driver 1 current high alarm...
  • Page 90 Email and Website—www.woodward.com Woodward has company-owned plants, subsidiaries, and branches, as well as authorized distributors and other authorized service and sales facilities throughout the world. Complete address / phone / fax / email information for all locations is available on our website.

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