Woodward TecJet 52 User manual

Installation and Operation Manual
TecJet™ 52 Gas Regulation
and Metering Valve/Actuator System
Manual 26399 (Revision A)

WARNING—DANGER OF DEATH OR PERSONAL INJURY
WARNING—FOLLOW INSTRUCTIONS
Read this entire manual and all other publications pertaining to the work to be performed
before installing, operating, or servicing this equipment. Practice all plant and safety
instructions and precautions. Failure to follow instructions can cause personal injury and/or
property damage.
WARNING—OUT-OF-DATE PUBLICATION
This publication may have been revised or updated since this copy was produced. To verify
that you have the latest revision, be sure to check the Woodward website:
www.woodward.com/pubs/current.pdf
The revision level is shown at the bottom of the front cover after the publication number. The
latest version of most publications is available at:
www.woodward.com/publications
If your publication is not there, please contact your customer service representative to get
the latest copy.
WARNING—OVERSPEED PROTECTION
The engine, turbine, or other type of prime mover should be equipped with an overspeed
shutdown device to protect against runaway or damage to the prime mover with possible
personal injury, loss of life, or property damage.
The overspeed shutdown device must be totally independent of the prime mover control
system. An overtemperature or overpressure shutdown device may also be needed for
safety, as appropriate.
WARNING—PROPER USE
Any unauthorized modifications to or use of this equipment outside its specified
mechanical, electrical, or other operating limits may cause personal injury and/or property
damage, including damage to the equipment. Any such unauthorized modifications: (i)
constitute "misuse" and/or "negligence" within the meaning of the product warranty
thereby excluding warranty coverage for any resulting damage, and (ii) invalidate product
certifications or listings.
CAUTION—POSSIBLE DAMAGE TO EQUIPMENT OR PROPERTY
CAUTION—BATTERY CHARGING
To prevent damage to a control system that uses an alternator or battery-charging device,
make sure the charging device is turned off before disconnecting the battery from the system.
CAUTION—ELECTROSTATIC DISCHARGE
Electronic controls contain static-sensitive parts. Observe the following precautions to
prevent damage to these parts.
•Discharge body static before handling the control (with power to the control turned off,
contact a grounded surface and maintain contact while handling the control).
•Avoid all plastic, vinyl, and Styrofoam (except antistatic versions) around printed circuit
boards.
•Do not touch the components or conductors on a printed circuit board with your hands
or with conductive devices.
IMPORTANT DEFINITIONS
•A WARNING indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
•A CAUTION indicates a potentially hazardous situation which, if not avoided, could result in
damage to equipment or property.
•A NOTE provides other helpful information that does not fall under the warning or caution
categories.
Revisions—Text changes are indicated by a black line alongside the text.
Woodward Governor Company reserves the right to update any portion of this publication at any time.
Information provided by Woodward Governor Company is believed to be correct and reliable. However, no
responsibility is assumed by Woodward Governor Company unless otherwise expressly undertaken.
© Woodward 2007
All Rights Reserved

Manual 26399 TecJet 52
Woodward i
Contents
REGULATORY COMPLIANCE ........................................................................III
CHAPTER 1. GENERAL INFORMATION........................................................... 1
Introduction.............................................................................................................1
Connections to the TecJet 52.................................................................................1
Programmable Features.........................................................................................2
Service Tool Software ............................................................................................2
CHAPTER 2. INSTALLATION.......................................................................... 5
Introduction.............................................................................................................5
Mounting.................................................................................................................5
Electrical Connections ............................................................................................6
Shielded Wiring ......................................................................................................7
Earth Ground ..........................................................................................................7
Supply Voltage .......................................................................................................7
Keyswitch Input ......................................................................................................7
PWM Input..............................................................................................................9
CAN ID Inputs.......................................................................................................10
CAN Termination ..................................................................................................10
CAN In ..................................................................................................................11
CAN Out ...............................................................................................................12
CAN Ground .........................................................................................................12
CAN Shield ...........................................................................................................12
4–20 mA Analog Input ..........................................................................................12
Status Output........................................................................................................13
RS-232 Serial Communication Service Port ........................................................13
Auxiliary Power Output .........................................................................................13
CHAPTER 3. DESCRIPTION OF OPERATION ................................................. 14
Configuration ........................................................................................................14
Power-on Procedure.............................................................................................14
Normal Operation .................................................................................................14
Diagnostics ...........................................................................................................15
Run Hours Counter...............................................................................................15
Position Limiter .....................................................................................................16
SAE J1939 Communications with Woodward EGS-02 ........................................16
CANopen Communications ..................................................................................23
Position Hold Feature ...........................................................................................27
General Specifications..........................................................................................28
CHAPTER 4. VALVE SIZING ........................................................................ 31
CHAPTER 5. SERVICE TOOL....................................................................... 36
Overview...............................................................................................................36
Description............................................................................................................36
Installation ............................................................................................................36
Troubleshooting the Driver ...................................................................................38
Configuring the Driver...........................................................................................44
Load Configuration Settings .................................................................................53
CHAPTER 6. TROUBLESHOOTING ............................................................... 54
CHAPTER 7. MAINTENANCE ....................................................................... 59
General.................................................................................................................59
Limits of Applicability ............................................................................................59
Cleaning Procedure..............................................................................................59

TecJet 52 Manual 26399
ii Woodward
Contents
CHAPTER 8. SERVICE OPTIONS..................................................................61
Product Service Options.......................................................................................61
Returning Equipment for Repair ...........................................................................62
Replacement Parts ...............................................................................................63
How to Contact Woodward...................................................................................63
Engineering Services............................................................................................64
Technical Assistance............................................................................................65
DECLARATIONS .........................................................................................66
Illustrations and Tables
Figure 1-1a. TecJet 52 Outline Drawing.................................................................3
Figure 1-1b. TecJet 52 Outline Drawing.................................................................4
Figure 2-1. TecJet 52 Wiring Diagram....................................................................8
Figure 2-2. TecJet 52 PWM Wiring ........................................................................9
Figure 2-3. TecJet 52 CAN Wiring for Isolated/Non-isolated Systems ................11
Figure 3-1. Address Claimed State Chart ............................................................22
Figure 4-1. Maximum Specialty Gas Flow Capacity of TecJet 52, 50 Plus,
Precision Flow, 50, and 110 ............................................................32
Figure 4-2. Minimum Specialty Gas Flow Capacity of TecJet 52, 50 Plus,
Precision Flow, 50, and 110 ............................................................33
Figure 4-3. Maximum Natural Gas Flow Capacity of TecJet 52, 50 Plus, Precision
Flow, 50, and 110 ............................................................................34
Figure 4-4. Minimum Natural Gas Flow Capacity of TecJet 52, 50 Plus, Precision
Flow, 50, and 110 ............................................................................35
Figure 5-1. Communication- Harness Connections .............................................37
Figure 5-2. Overview Screen................................................................................39
Figure 5-3. Troubleshooting Screen.....................................................................40
Figure 5-4. Warnings Screen................................................................................41
Figure 5-5. Errors Screen .....................................................................................42
Figure 5-6. Configuration Screen .........................................................................43
Figure 5-7. Identification Screen...........................................................................44
Figure 5-8. Edit TecJet Configuration, Demand Source.......................................45
Figure 5-9. Edit TecJet Configuration, General....................................................46
Figure 5-10a. Edit TecJet Configuration, Flow (CAN Demand) ...........................47
Figure 5-10b. Edit TecJet Configuration, Flow (Analog Demand)........................48
Figure 5-10c. Edit TecJet Configuration, Flow (PWM Demand) ..........................49
Figure 5-11. Edit TecJet Configuration, Failed Sensor Defaults ..........................50
Figure 5-12. Edit TecJet Configuration, Filters.....................................................51
Figure 5-13a. Edit TecJet Configuration, CAN (Default) ......................................52
Figure 5-13b. Edit TecJet Configuration, CAN (User Configured) .......................52
Table 2-1. Mating Connector ..................................................................................6

Manual 26399 TecJet 52
Woodward iii
Regulatory Compliance
European Compliance for CE Marking:
These listings apply to stationary industrial markets only and are limited only to
those units bearing the CE Marking.
EMC Directive: Declared to 2004/108/EC COUNCIL DIRECTIVE of 15
December 2004 on the approximation of the laws of the
Member States relating to electromagnetic compatibility
and all applicable amendments.
Other European and International Compliance:
Compliance with the following European Directives or standards does not qualify
this product for application of the CE Marking.
Machinery Directive: Compliant as a component with 98/37/EC COUNCIL
DIRECTIVE of 23 July 1998 on the approximation of
the laws of the Member States relating to machinery.
Pressure Equipment
Directive:
Exempt per Clause 4 of the Pressure Equipment
Directive 97/23/EC of 29 May 1997 on the
approximation of the laws of the Member States
concerning pressure equipment.
North American Compliance:
These listings are limited only to those units bearing the CSA identification.
CSA: CSA Certified for Class I, Division 2, Groups A, B, C &
D, T3 at 85 °C Ambient for use in Canada and the
United States.
Certificate pending
This product is certified as a component for use in other equipment. The final
combination is subject to acceptance by the authority having jurisdiction or local
inspection.
Wiring must be in accordance with North American Class I, Division 2 wiring
methods, as applicable, and in accordance with the authority having jurisdiction.
Special Conditions For Safe Use:
Field Wiring must be suitable for at least 85 °C.
Connect ground lug of TecJet™ 52 to earth ground.
The TecJet 52 actuator should be protected from exposure to sunlight and rain.
The Ingress Protection rating of the control depends on the use of proper mating
connectors. Refer to Table 2-1 in the Installation section of this manual for
information on the proper mating connectors for use with this control.

TecJet 52 Manual 26399
iv Woodward
WARNING—EXPLOSION HAZARD
Do not remove covers or connect/disconnect electrical connectors unless
power has been switched off or the area is known to be non-hazardous.
Substitution of components may impair suitability for Class I, Division 2 or
Zone 2.
Do not clean equipment unless the area is known to be non-hazardous.
AVERTISSEMENT—RISQUE D’EXPLOSION
Ne pas enlever les couvercles, ni raccorder / débrancher les prises
électriques, sans vous en assurez auparavant que le système a bien été mis
hors tension; ou que vous vous situez bien dans une zone non explosive.
La substitution de composants peut rendre ce matériel inacceptable pour les
emplacements de Classe I, Division 2 ou Zone 2.
Ne pas nettoyer l’équipement à moins de se trouver dans un emplacement
non dangereux.
CAUTION—WIRING
Due to the hazardous location listing associated with this product, proper
wire type and wiring practices are critical to operation.
Do not connect any cable grounds to “instrument ground”, “control
ground”, or any non-earth ground system. Make all required electrical
connections based on the wiring diagram per Figure 2-1

Manual 26399 TecJet 52
Woodward 1
Chapter 1.
General Information
Introduction
The TecJet™ 52 valve/actuator is an integrated, digitally compensated, control
valve and actuator system for metering and regulating the flow of gaseous fuels.
The device is designed to accept a fuel flow demand input signal. It also includes
internal feedback sensors that measure fuel pressure, temperature, and valve
differential pressure. Based on these sensor input signals, the device calculates
and controls the valve position needed to produce a mass flow rate that matches
the demanded fuel flow within the accuracy specified elsewhere in this manual.
The TecJet 52 actuator includes closed-loop position control based on an internal
position sensor and the calculated position setpoint. Model-based position
controller software is used to position the valve. An integrated return spring is
provided in the actuator. Upon loss of power, the return spring will drive the valve
to closed within 2 seconds over the fluid operating temperature range.
This manual covers the TecJet 52 Fuel Metering Valves.
The TecJet 52 valve/actuator is intended to be mounted on-engine or very close
to the engine. The dominant application of this valve is fuel control for gas-fueled
reciprocating engines controlled by an electronic engine control system.
NOTE
Throughout the remainder of the manual, the TecJet 52 valve and actuator
system will be referred to simply as the TecJet 52.
Connections to the TecJet 52
The TecJet 52 has the following connections to the ECM (Engine Control
Module), and the engine harness:
Earth Ground Provided through ground lug on housing.
Power Input 18–32 Vdc measured at the TecJet 52.
Key Switch input Contact input to switch the TecJet 52 in and out of a
low-power state.
CANbus In Configurable as mass flow demand input.
PWM Configurable as mass flow demand input.
4–20 mA Analog Configurable as mass flow demand input.
CAN ID Inputs TecJet 52 number selection for CANbus IDs.
CAN Termination Internal CAN termination resistor option.
CANbus Out Second set of CAN pins for connecting to the next
CAN device.
Status Output Low-side relay/lamp driver that changes state during
a fault condition.
The TecJet 52 provides serial communications connections in the main
connector for program upgrades and service tool interfacing by qualified service
personnel. The service personnel will need to use an external TTL to RS-232
adaptor (Woodward P/N 1249-1039) to make communications possible.

TecJet 52 Manual 26399
2 Woodward
Programmable Features
Control setup is accomplished through the use of a PC (personal computer),
Woodward Service Tool software, and TTL to RS-232 adaptor. The TecJet 52 is
provided pre-configured with default settings and may not require additional
setup. The features identified below are described in Chapter 5. Briefly, the
programmable features include:
•Configure Demand Source
o Jenbacher CAN (Proprietary protocol)
o Analog 4–20
o PWM
o EGS-01 (Proprietary protocol)
o GECM (Proprietary protocol)
o EGS-02 (SAE J1939 protocol)
•Configure General
o Fuel Gas Defaults (K, Density)
o Fuel Gas Temperature Warning Thresholds (High & Low °C)
o Fuel Gas Pressure Warning Thresholds (High & Low mbar)
o ΔP Warning Threshold (High & Low ΔP mbar)
•Configure Flow (Demand Source Dependent)
o Demand Fail Limits (ms, mA, or %)
o Scaling (High & Low mA or Duty Cycle % to Nl/s Flow)
•Configure Failed Sensor Defaults
o Fuel Gas Temperature Sensor Default Temperature (°C)
o Fuel Gas Pressure Sensor Default Downstream pressure (Table)
•Configure Filters
o ΔP Filter Time Constant (sec)
o Fuel Gas Pressure Filter Time Constant (sec)
o Fuel Gas Temperature Filter Time Constant (sec)
o Flow Demand Filter Time Constant (sec)
•Configure CAN (Demand Source Dependent)
o Baud Rate Default (kbits/s)
o Baud Rate User Configured
Baud Rate Prescaler:
TSEG1:
TSEG2:
Synchronization Jump Width:
Service Tool Software
The TecJet Service Tool software is a Microsoft Windows based GUI (graphic
user interface) used to configure and troubleshoot the TecJet 52. The Service
Tool Software is compatible with Microsoft Windows® XP, 2000, NT 4.0, Me, 98
and gives the end user the ability to:
•Configure control settings based on application requirements
•Load the configuration into the control
•Monitor control parameters
•View and reset fault conditions
Detailed descriptions of software installation are available in Chapter 5.

Manual 26399 TecJet 52
Woodward 3
Figure 1-1a. TecJet 52 Outline Drawing

TecJet 52 Manual 26399
4 Woodward
Figure 1-1b. TecJet 52 Outline Drawing

Manual 26399 TecJet 52
Woodward 5
Chapter 2.
Installation
Introduction
WARNING—LIFTING
The TecJet™ 52 weighs 17 kg (38 lb). In order to prevent injury, some form
of lifting assistance (a lifting strap is recommended) should be used when
handling the TecJet 52.
WARNING—EXTERNAL LEAKAGE
The TecJet 52 valve is pressure tested at Woodward. Allowable external
leakage is less than 2 SCCM or 0.00015 kg/h.
WARNING—VENTILATION
The TecJet 52 valve is NOT equipped with an overboard drain in the event of
gas leakage through its various seals. The valve should therefore be used in
a well-ventilated area. A methane detector should be used if the valve will be
used in an enclosed installation.
WARNING—LEAKAGE
Leak-check all gaseous fuel connections. Leaking gaseous fuel can cause
explosion hazards, property damage, or loss of life.
Be careful when unpacking the TecJet 52. Check the assembly for signs of
damage, such as bent or dented covers, scratches, and loose or broken parts.
Be especially careful not to rest the TecJet 52 on the valve position pointer or on
the actuator electrical connectors. Notify the shipper and Woodward if damage is
found.
If the TecJet 52 is to be painted, appropriate means must be used to mask the
following items/areas:
•All identification and warning labels
•Main electrical connector
•Junction between the valve shaft and the valve housing (this is a dynamic
junction next to the valve position pointer)
Mounting
TecJet 52 orientation and mounting must be designed to reduce the possibility of
fuel contamination. Orientation of the valve should be with the actuator +15/–90°
relative to horizontal with the sensor module skyward. The axis of the valve bore
can be +90/–15° relative to horizontal, with +90° representing the outlet of the
valve pointing skyward. Installations with a bore axis orientation in the +15 to
+90° range must incorporate means to prevent the buildup of moisture or other
liquids in the fuel train. The valve has an arrow indicating flow direction cast into
the outside of the valve housing. Washers should be placed between the valve
body and any fasteners used. Give consideration to the strength of the mounting
plate in order to support the 17.2 kg (38 lb) weight of the TecJet 52. Refer to the
outline drawing in Figure 1-1 for dimensions and details relative to the valve inlet
flange and outlet flange.

TecJet 52 Manual 26399
6 Woodward
For on-engine applications, a suitable bracket must be constructed to brace the
valve mounting feet to a secure structure on the engine. See the outline drawing
(Figure 1-1b) for the valve mounting feet hole and hole-location details. This
mounting configuration should ensure that moment loads are not applied either
through installation or thermal stress that could cause the valve to bind and lose
functionality.
The inlet and outlet piping of the TecJet 52 must be in accordance with
ANSI/ISA-S75.02 to ensure the flow metering accuracy specified elsewhere in
this manual. However, an inlet piping length as short as 6 diameters and an
outlet piping length as short as 2 diameters can typically be used with a
negligible loss in valve metering accuracy.
Electrical Connections
The TecJet 52 is electrically connected to the control system by the main
connector shown in Figure 1-1. The mating connector should be torqued per the
value indicated in Figure 1-1. The following mating connectors are compatible
with the TecJet 52 control.
Supplier Part Number
Amphenol Amphenol Connector: P/N ACC 06E 24-28S (025)
Amphenol Contacts: P/N 10-597109-171 (CRIMP)
Amphenol Sealing Plugs P/N 10-405996-16
Cannon Cannon Connector: P/N CA 06R 24-28S A206
Cannon Contacts: P/N 031-0560-161 (CRIMP)
Cannon Sealing Plugs: P/N 225-0017-000
Woodward Connector Kit: P/N 6995-1021 (Connector, Contacts, Sealing Plugs)
Table 2-1. Mating Connector
WARNING—EXPLOSION HAZARD
Do not remove covers or connect/disconnect electrical connectors unless
power has been switched off or the area is known to be non-hazardous.
AVERTISSEMENT—RISQUE D’EXPLOSION
Ne pas enlever les couvercles, ni raccorder / débrancher les prises
électriques, sans vous en assurez auparavant que le système a bien été mis
hors tension; ou que vous vous situez bien dans une zone non explosive.
CAUTION—WIRING
Due to the hazardous location listing associated with this product, proper
wire type and wiring practices are critical to operation.
Do not connect any cable grounds to “instrument ground”, “control
ground”, or any non-earth ground system. Make all required electrical
connections based on the wiring diagram in Figure 2-1.
WARNING—INGRESS PROTECTION
The control will only meet ingress protection specifications while the mating
connector is installed in the unit. As such, the unit should not be exposed to
operating environments unless the mating connector is installed.
In addition, if a wire is not used for each of the 24 pins on the control, a
sealing plug must be used in place of each missing wire. Failure to adhere to
these guidelines may result in product failure or decreased life.

Manual 26399 TecJet 52
Woodward 7
Shielded Wiring
Shielded wiring is generally not required. The use of cable with individually shielded-
twisted pairs is only required where indicated by the control wiring diagrams (Figure
2-1). However, some users may elect to run shielded wires for some I/O signals.
Cable shields must be terminated as indicated in the control wiring diagram using the
installation notes described below. DO NOT attempt to directly ground the shield at
both ends since an undesired ground loop condition may occur. The TecJet 52 CAN
shield connection pin is grounded through a high frequency capacitor (not directly
grounded) and must be grounded in the wiring harness.
Installation Notes
•Wires exposed beyond the shield should be as short as possible, not
exceeding 50 mm (2 inches).
•The shield termination wire (or drain wire) should be kept as short as
possible, not exceeding 50 mm (2 inches), and where possible the diameter
should be maximized.
•Installations with severe electromagnetic interference (EMI) may require
additional shielding precautions. Contact Woodward for more information.
Failure to provide shielding can produce future conditions which are difficult to
diagnose. Proper shielding, when provided, at the time of installation is
recommended to assure satisfactory operation of the product.
Earth Ground
Ground Lug = Earth Ground
In order to ensure CE compliance, the connection to the earth ground needs to meet
the following requirements. First, the connection must be less than 183 cm (6 ft) in
length. Second, the wire that is used must be at least 3.3 mm² (12 AWG) in size.
Supply Voltage
W = Power-In (+)
Z = Power-In (–)
The supply voltage during normal operation must be 18 to 32 V, measured at the
TecJet 52 connector. Steady state input current can reach 1.0 A, and transient
input current may reach up to 4 A. The recommended power supply cable size is
at least 1.3 mm² or 16 AWG. The power supply wiring must be fused outside of
the valve. The recommended fuse is a 6 A slow blow fuse.
Recommended maximum wire length from power source to TecJet 52 based on
a 24 V Power Supply: 51 m (167 ft) using 16 AWG (1.3 mm²) stranded wire.
Keyswitch Input
F = Keyswitch
The keyswitch input is used to switch the TecJet 52 in and out of the run state. A
high signal (connected to Aux. Power Out) will allow the valve to operate in a
normal mode, and a low signal (connected to supply [–] or open connection) will
force the valve to a minimum position (if possible) and then into a low power
state. When the keyswitch input goes low, the valve will disable the driver
circuitry after the software has gone through a shutdown procedure.

TecJet 52 Manual 26399
8 Woodward
CAN Hi In
CAN Lo In
CAN Shield
CAN Hi Out
CAN Lo Out
PWM In +
Keyswitch
Power In+
Power In -
TecJet 52
Jumper for CAN Termination Resistor
Z
W
F
L
K
B
A
Q
P
U
T
X
S
R
PWM In -
4-20mA Analog In +
4-20mA Analog In -
}
}
From Previous
CAN Device
To Next
CAN Device
Battery
EStatus Output (Discrete)
H
JDiscrete/RS232 Common
VCAN Gnd
YPWMShield
G
RS232 Serial
Communication
CAN ID2
CAN ID1
N
M
D
CAux. Power Out
Aux. Power Out
Load
(relay coil
or lamp)
1
11
3
TTL
232
3
RS232 Tx
RS232 Rx
2
5
TTL to RS 232 Converter
(Woodward 1249-1039)
2
Straight-Through
9-Pin Serial Cable
(Must have all conductors)
NOTES:
2
USE AUX. POWER OUT (PINS C OR D) TO POWER THE KEYSWITCH INPUT AND THE STATUS OUTPUT LOAD,
WHEN NEEDED.
3
THE STATUS OUTPUT IS A LOW-SIDE SWITCH THAT CAN BE OPERATED AT A MAXIMUM OF 42 V AND 500 MA.
THE MINIMUM WIRE SIZE FOR PINS W AND Z (POWER SUPPLY INPUTS) IS 16 AWG. FOR ALL OTHER I/O, THE
RECOMMENDED WIRE SIZE IS AT LEAST 18 AWG.
SHIELDING FOR THE ANALOG INPUT IS OPTIONAL
4
4
5
5THE SHIELDING FOR THE ANALOG INPUT (OPTIONAL) AND FOR THE PWM INPUT SHOULD BE TERMINATED AT
THE CUSTOMER END.
Figure 2-1. TecJet 52 Wiring Diagram
NOTE
All signal and I/O wiring on the TecJet 52 is not to exceed 30 m (100 ft) in length. See
“Supply Voltage” section for specific wire length limitations on the power supply
inputs.
NOTE
When wiring to pins V and/or J on the TecJet 52, be careful to ensure that the
external circuit interface is isolated from battery ground, either by means of galvanic
isolation or differential input/output.
If it is not, a ground loop could be formed that can cause excess noise on the lines
and/or damage to circuits.

Manual 26399 TecJet 52
Woodward 9
PWM Input
K = PWM input (+)
L = PWM input (–)
The PWM input is configurable as the mass flow demand input. The PWM Input
is designed for use with a push-pull type driver.
Input Magnitude: 5–32 V differential input
Input Impedance: 67 kΩ
Input Type: Differential Input
Frequency Range: 80–1100 Hz
Isolation: none
Resolution: 12 bits
Accuracy: 1.0% of full scale up to 1 kHz @ 25 °C
1.5% of full scale above 1 kHz @ 25 °C
Temperature Drift: ≤100ppm/°C
Safe Input Common
Mode Voltage: At least ±50 V
PWM Detection Threshold 1.15 V nominal
Figure 2-2. TecJet 52 PWM Wiring

TecJet 52 Manual 26399
10 Woodward
CAN ID Inputs
H = CAN ID 1
G = CAN ID 2
J = Discrete/RS232 Common
The CAN ID inputs are used to select which CAN identifiers will be used on the
CANbus. With no programming tools, the customer can select from the four pre-
programmed CAN IDs through a hard-wired code in the engine harness. This is
especially important where more than one TecJet 52 is used on an engine. If one
TecJet 52 valve is replaced with another, the new valve will read the correct ID
number from the engine harness connector. See the table below for the code
definition. Note that when the CAN ID is to be tied high, it should be connected to
the Aux. Power Output pin (pin C or D)
TecJet 52 CAN ID CAN ID1 CAN ID2
“TecJet 52 1” Aux. Power Out or Open Aux. Power Out or Open
“TecJet 52 2” Discrete Common Aux. Power Out or Open
“TecJet 52 3” Aux. Power Out or Open Discrete Common
“TecJet 52 4” Discrete Common Discrete Common
CAN Termination
P = Termination resistor
Q = Termination resistor
The internal termination resistor (124 Ω) is used to terminate the CANbus.
According to the CAN specification, every CANbus must be terminated at both
ends of the bus. If a TecJet 52 valve is connected to the far end of the bus, this
termination resistor can be used. If termination is needed, connect a link between
pins P and Q. This link should be as short as possible. If no termination resistor
is needed, leave pins P and Q unconnected.
WARNING—CANBUS
If the internal termination is used, other devices on the CANbus may not
operate properly when the TecJet 52 valve is disconnected from the bus. An
external termination resistor should be used if there are other devices on the
CANbus that must not lose communication when the TecJet 52 valve is
disconnected.

Manual 26399 TecJet 52
Woodward 11
CAN In
R = CAN high in
S = CAN low in
V = CAN Ground (do not connect unless CAN source is isolated–see Figure 2-2)
Pins R and S are the CAN communication wires. Make sure that the correct
cable is used for connection to the CAN terminals (SAE J1939/11). CAN is non-
isolated, and no wiring is to exceed 30 m in length.
Voltage Level: 5 V
Isolation: None
Type: The TecJet 52 supports CAN 2.0B
Baud Rate: Configurable from 250 K to 1 Meg
120
Ohm
User Control
CAN High
CAN Low
CAN Common
TecJet 52
CAN Interface
R
S
X
V
CAN
Controller
P
Q
Isolated User Source ONLY
120
Ohm
Connect P and Q with a
short jumper if termina ion
is desired.
Non-Isolated User Source
(Input Power - is CAN
common connection)
120
Ohm
User Control
CAN High
CAN Low
TecJet 52
CAN Interface
R
S
X
V
CAN
Controller
P
Q
120
Ohm
Connect P and Q with a
short jumper if termina ion
is desired.
Figure 2-3. TecJet 52 CAN Wiring for Isolated/Non-isolated Systems

TecJet 52 Manual 26399
12 Woodward
CAN Out
T = CAN high out
U = CAN low out
The CAN output pins are connected to the CAN input pins internally. They are
provided for linking more then one TecJet 52 to the CANbus without the need for
junction boxes or doubled terminations to connector pins. For example, the
CANbus from the control may be connected to the input pins, and the output pins
are connected to the second TecJet 52 input pins.
WARNING—CANBUS
If a second device is connected to the CAN output pins, this device will lose
communication if the TecJet 52 valve is disconnected.
CAN Ground
V = CAN Ground
Pin V is the CAN ground connection for the CAN communication wires.
NOTE
Only use the CAN ground pin (V) if the CAN source is isolated. See Figure
2-2. If pin V is used with a non-isolated CAN source, a ground loop can be
formed, which can disrupt communications and/or damage circuitry.
CAN Shield
X = CAN Shield
The CAN Shield can be used to terminate the shield of the CAN wiring. Internally,
this pin is connected to the TecJet 52 chassis through a capacitor.
4–20 mA Analog Input
A = 4–20 mA Analog Input (+)
B = 4–20 mA Analog Input (–)
The 4–20 mA Analog Input is configurable as the mass flow demand input.
Input Impedance: 200 Ω
Input Type: 4–20 mA differential
Max Input Current: 26 mA
Input Common Mode Range: At least ±50 V
Common Mode Rejection Ratio: -60 dB minimum (DC to 500Hz)
Safe Input Common
Mode Voltage: At least ±200 V
Accuracy: ±180μA @ 25 °C
Temperature Drift: <50 ppm/°C

Manual 26399 TecJet 52
Woodward 13
Status Output
E = Status Output
J = Discrete/RS-232 Common
The status output indicates whether the TecJet 52 valve is operating correctly. It
will be "on" when the valve is operating normally and "off" when any warnings or
errors are active. The Status Output electrical circuit is a low-side switch with the
return current going to input power minus. It will be actively driven to Battery (-)
when "on" and pulled to Battery (+) through a resistor when "off". The output load
must be connected to the Status Output pin and to the Aux Power Out pin of the
actuator. If the load is below 500 mA, the load can be driven directly from the
output. It is possible to drive a relay if more current is needed for the load.
If it is necessary to use an independent power supply instead of the Aux Power
Out, then a protective fuse must be provided and the negative connection of the
independent power supply must be tied to the actuator negative power input pin.
The maximum voltage when the switch is in the “Off” state is 40 Vdc. The output
is current protected and turns off if driven above 500 mA. If the short is removed,
the output automatically returns to normal operation.
Output Type: Low-Side Discrete Output Driver
Drive Current: 500 mA max
Max. Voltage: 42 Vdc
RS-232 Serial Communication Service Port
M = Serial TX
N = Serial RX
J = Discrete/RS232 Common
The RS-232 service port is used to configure, calibrate and trouble shoot the
TecJet 52. The TecJet Service Tool can be downloaded from the Internet at
www.woodward.com/software. The RS-232 wiring must meet the requirements
in the EIA RS-232 Standard document. An external TTL to RS-232 converter
(Woodward PN 1249-1039) is necessary to make communications possible with
the Woodward TecJet Service Tool. The converter must be located a maximum
of 1 meter from the TecJet 52. A connectivity kit can be purchased from
Woodward to accomplish this. Further instructions for using this connectivity kit
are provided in Chapter 5.
Isolation: None
Baud Rate: 38.4 Kbaud
Auxiliary Power Output
C = Aux. Power Out
D = Aux. Power Out
The Auxiliary power output pins are designed as a convenient way to wire any of
the inputs that require a pull-up to battery, such as keyswitch and the CAN ID
pins. This is also a good way to supply power through a load to the Status
Output. Using the Aux. Power Output for these functions is highly recommended
for the best EMI performance. Please note that using the Aux. Power Out in the
keyswitch circuit will protect the circuitry from harmful surges in power.

TecJet 52 Manual 26399
14 Woodward
Chapter 3.
Description of Operation
WARNING—NOISE
Due to typical noise levels in engine environments, hearing protection
should be worn when working on or around the TecJet™ 52 valve/actuator.
WARNING—BURN HAZARD
The surface of this product can become hot enough or cold enough to be a
hazard. Use protective gear for product handling in these circumstances.
Temperature ratings are included in the specification section of this manual.
CAUTION—FIRE PROTECTION
Explosion Hazard—External fire protection is not provided in the scope of
this product. It is the responsibility of the user to satisfy any applicable
requirements for their system.
Configuration
The valve can be configured to accept a flow demand from the analog input, the
PWM input, or the CAN port. The configuration also includes user adjustable
warning limits, and default values for failed sensor backup modes. The
configuration can be viewed or changed online using the TecJet Service Tool.
See Chapter 5 for information on installing the service tool.
Power-on Procedure
When power is applied to the valve, it performs a diagnostic check. If there are
no problems detected, the actuator is enabled with 1.36 Nxm (1.0 lb-ft) of torque,
and the valve closes. If the flow demand source is configured for CAN, the valve
reads the CAN ID input pins and begins sending diagnostic information on the
CAN link. If a problem is detected, the valve will not operate and the status
output will indicate a fault.
Typically the TecJet 52 is continuously connected to the supply voltage. If the
flow demand source is configured to Jenbacher CAN, the key switch has no
effect. If the flow demand source is configured for anything else, the key switch
input must be connected to a high signal (supply [+]) for the valve to operate.
When the key switch is off, the valve closes, if possible, and the actuator driver
that positions the valve is disabled to minimize the amount of current drawn from
the battery.
Normal Operation
If a valid flow demand and delta-pressure are present, the valve begins normal
operation. The TecJet 52 calculates the area needed to provide the requested
flow. This area is calculated using the delta pressure (inlet to outlet pressure
differential), the absolute inlet fuel gas pressure, the fuel gas temperature, the
fuel gas ratio of specific heats (K), the fuel gas density, and the calibration
information stored in the valve. The actuator positions the valve to achieve the
calculated area requirement.