Woodward TecJet 50 Plus User manual

Product Manual 26219
(Revision K, 07/2019)
Original Instructions
TecJet™ 50 Plus /
TecJet 50 Plus Precision Flow
Gas Regulation and
Metering Valve/Actuator System
Installation and Operation Manual
Released

General
Precautions
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.
Revisions
This publication may have been revised or updated since this copy was produced.
To verify that you have the latest revision, check manual 26455, Customer
Publication Cross Reference and Revision Status & Distribution Restrictions, on
the publications page of the Woodward website:
www.woodward.com/publications
The latest version of most publications is available on the publications page. If
your publication is not there, please contact your customer service representative
to get the latest copy.
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.
Translated
Publications
If the cover of this publication states "Translation of the Original Instructions"
please note:
The original source of this publication may have been updated since this
translation was made. Be sure to check manual 26455, Customer Publication
Cross Reference and Revision Status & Distribution Restrictions, to verify whether
this translation is up to date. Out-of-date translations are marked with . Always
compare with the original for technical specifications and for proper and safe
installation and operation procedures.
Revisions—Changes in this publication since the last revision 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. Manual 26219
Copyright © Woodward 2003–2019
All Rights Reserved
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Contents
WARNINGS AND NOTICES...........................................................................3
ELECTROSTATIC DISCHARGE AWARENESS .................................................4
REGULATORY COMPLIANCE .......................................................................5
CHAPTER 1. GENERAL INFORMATION..........................................................7
Introduction.............................................................................................................7
Connections to the TecJet......................................................................................7
CHAPTER 2. INSTALLATION ........................................................................8
Introduction.............................................................................................................8
Mounting.................................................................................................................8
Electrical Connections............................................................................................9
Shielded Wiring ....................................................................................................12
Earth Ground........................................................................................................12
Supply Voltage .....................................................................................................12
Keyswitch..............................................................................................................14
PWM Input............................................................................................................14
CAN ID Inputs.......................................................................................................14
CAN Termination..................................................................................................15
CAN In..................................................................................................................15
CAN Out ...............................................................................................................15
CAN Shield...........................................................................................................16
4–20 mA Analog Input..........................................................................................16
Status Output........................................................................................................16
RS-232 Serial Communication Service Port ........................................................16
CHAPTER 3. DESCRIPTION OF OPERATION ................................................17
Configuration ........................................................................................................17
Power-on Procedure.............................................................................................17
Normal Operation .................................................................................................17
Diagnostics...........................................................................................................18
Run Hours Counter...............................................................................................18
Position Limiter.....................................................................................................19
CANopen Communications..................................................................................19
SAE J1939 Communications................................................................................23
Position Hold Feature...........................................................................................28
General Specifications..........................................................................................29
CHAPTER 4. VALVE SIZING.......................................................................32
CHAPTER 5. TROUBLESHOOTING..............................................................37
CHAPTER 6. SERVICE TOOL INSTALLATION ...............................................43
TecJet Users Guide..............................................................................................43
CHAPTER 7. MAINTENANCE......................................................................44
General.................................................................................................................44
Limits of Applicability ............................................................................................44
Cleaning Procedure..............................................................................................44
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Contents
CHAPTER 8. PRODUCT SUPPORT AND SERVICE OPTIONS...........................46
Product Support Options ......................................................................................46
Product Service Options.......................................................................................46
Returning Equipment for Repair...........................................................................47
Replacement Parts...............................................................................................47
Engineering Services............................................................................................48
Contacting Woodward’s Support Organization ....................................................48
Technical Assistance............................................................................................49
REVISION HISTORY ..................................................................................50
DECLARATIONS .......................................................................................51
Illustrations and Tables
Figure 2-1a. TecJet 50 Plus Outline Drawing.......................................................10
Figure 2-1b. TecJet 50 Plus Outline Drawing.......................................................11
Figure 2-2. TecJet Wiring Diagram.......................................................................13
Figure 3-1. Address Claimed State Chart ............................................................27
Figure 4-1. Maximum Specialty Gas Flow Capacity of TecJet 50 Plus, 50 Plus
Precision Flow, 50, and 110 ............................................................33
Figure 4-2. Minimum Specialty Gas Flow Capacity of TecJet 50 Plus, 50 Plus
Precision Flow, 50, and 110 ............................................................34
Figure 4-3. Maximum Natural Gas Flow Capacity of TecJet 50 Plus, 50 Plus
Precision Flow, 50, and 110 ............................................................35
Figure 4-4. Minimum Natural Gas Flow Capacity of TecJet 50 Plus, 50 Plus
Precision Flow, 50, and 110 ............................................................36
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Warnings and Notices
Important Definitions
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible injury or death.
DANGER—Indicates a hazardous situation which, if not avoided, will result
in death or serious injury.
WARNING—Indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION—Indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE—Indicates a hazard that could result in property damage only
(including damage to the control).
IMPORTANT—Designates an operating tip or maintenance suggestion.
Overspeed /
Overtemperature /
Overpressure
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.
Personal Protective
Equipment
The products described in this publication may present risks that
could lead to personal injury, loss of life, or property damage.
Always wear the appropriate personal protective equipment (PPE) for
the job at hand. Equipment that should be considered includes but is
not limited to:
Eye Protection
Hearing Protection
Hard Hat
Gloves
Safety Boots
Respirator
Always read the proper Material Safety Data Sheet (MSDS) for any
working fluid(s) and comply with recommended safety equipment.
Start-up
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
Automotive
Applications
On- and off-highway Mobile Applications: Unless Woodward's
control functions as the supervisory control, customer should install
a system totally independent of the prime mover control system that
monitors for supervisory control of engine (and takes appropriate
action if supervisory control is lost) to protect against loss of engine
control with possible personal injury, loss of life, or property
damage.
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Battery Charging
Device
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.
Electrostatic Discharge Awareness
Electrostatic
Precautions
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.
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.
Follow these precautions when working with or near the control.
1. Avoid the build-up of static electricity on your body by not wearing clothing
made of synthetic materials. Wear cotton or cotton-blend materials as much
as possible because these do not store static electric charges as much as
synthetics.
2. Do not remove the printed circuit board (PCB) from the control cabinet
unless absolutely necessary. If you must remove the PCB from the control
cabinet, follow these precautions:
Do not touch any part of the PCB except the edges.
Do not touch the electrical conductors, the connectors, or the
components with conductive devices or with your hands.
When replacing a PCB, keep the new PCB in the plastic antistatic
protective bag it comes in until you are ready to install it. Immediately
after removing the old PCB from the control cabinet, place it in the
antistatic protective bag.
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Regulatory Compliance
European Compliance for CE Marking
EMC Directive: Declared to Directive 2014/30/EU of the
European Parliament and of the Council of 26
February 2014 on the harmonization of the laws
of the Member States relating to electromagnetic
compatibility (EMC).
Other European Compliance
Compliance with the following European Directives or Standards does not qualify
this product for application of the CE marking:
Machinery Directive: Compliant as partly completed machinery with
Directive 2006/42/EC of the European
Parliament and the Council of 17 May 2006 on
machinery.
Pressure Equipment Directive: Exempt per Clause 6 of Directive 2014/68/EU on
the harmonisation of the laws of the Member
States relating to the making available on the
market of pressure equipment.
RoHS Directive: Restriction of Hazardous Substances
2011/65/EU:
This product is intended to be sold and used
only as equipment which is specifically
designed, and is to be installed, as part of
another type of equipment that is excluded or
does not fall within the scope of this Directive,
which can fulfil its function only if it is part of that
equipment, and which can be replaced only by
the same specifically designed equipment and
therefore fulfills the requirements stated in
Art.2.4(c) and as such is excluded from the
scope of the Directive
Restriction of Hazardous Substances
2011/65/EU:
This product is intended to be sold and used
only as repair, updating or upgrading of EEE
(as defined in Article 3(27) of the Directive) that
either was excluded from the scope of the
Directive at the time of placing on the market (as
defined in Article 4.4(e)) or which benefited from
an exemption and which was placed on the
market before that exemption expired (per
Article 4.4(f)).
North American Compliance
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 1167451
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This product is certified as a component for use in other equipment. The final
combination is subject to acceptance by CSA International or local inspection.
The TecJet™ is suitable for use in Class I, Division 2, Groups A, B, C, and D per
CSA for Canada and US, or non-hazardous location only.
The TecJet wiring must be in accordance with North American Class I, Division
2, or Zone 2 wiring methods as applicable, and in accordance with the authority
having jurisdiction.
Wiring for the TecJet power input must be suitable for at least 85 °C.
Connect ground lug of TecJet to earth ground.
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.
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 2-2.
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Chapter 1.
General Information
Introduction
The TecJet™ valve/actuator is an integrated, digitally compensated control valve
and actuator system for regulating and metering the flow of gaseous fuels. The
device is designed to accept a fuel rate demand signal. It also incorporates
feedback sensors that monitor fuel pressure, temperature, and valve pressure
differential. Based on these sensor signals, the device modulates the valve
opening to produce a physical fuel mass flow that matches the flow demand level
within the accuracy specified elsewhere in this manual.
This manual covers the TecJet 50 Plus (TJ50P) and the TecJet 50 Plus Precision
Flow (TJ50PPF) Fuel Metering Valves.
The TecJet valve/actuator is intended to be mounted on or very close to the
engine. The dominant application of this valve is gas fueled reciprocating engines
controlled by an electronic engine control system.
Throughout the remainder of the manual, the TecJet valve and
actuator system will be referred to simply as the TecJet.
Connections to the TecJet
The TecJet valve 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.
Key Switch input Contact input to switch the TecJet 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 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 High side switch that changes state during a fault
condition.
The TecJet has available RS-232 connections in the main connector for program
upgrades and service tool interfacing by qualified service personnel.
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Chapter 2.
Installation
Introduction
The TecJet valve is pressure tested at Woodward. Allowable external
leakage is less than 2 sccm or 0.00015 kg/h.
The TecJet 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.
The TecJet™ weighs 24 kg (52 lb). In order to prevent injury, some
form of lifting assistance (a lifting strap is recommended) should be
used when handling the TecJet.
Be careful when unpacking the TecJet. 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 on the valve position pointer or the
actuator electrical connectors. Notify the shipper and Woodward if damage is
found.
If the TecJet 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 orientation and mounting must be designed to reduce the possibility of
fuel contamination. Orientation of the valve should be with the actuator ±15°
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 24 kg (52 lb) weight of the TecJet. Refer to the
outline drawing in Figure 2-2 for dimensions and details relative to the valve inlet
flange and outlet flange.
For on-engine applications, a suitable bracket must be constructed to brace the
actuator to a secure structure on the engine. See the outline drawing (Figure 2-1)
for the actuator mounting hole and hole-location details. This actuator mounting
configuration should ensure that moment loads are not applied to the actuator,
either through installation or thermal stress that could cause the valve to bind and
lose functionality.
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The inlet and outlet piping of the TecJet 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.
Leak check all gaseous fuel connections. Leaking gaseous fuel can
cause explosion hazards, property damage, or loss of life.
Electrical Connections
The TecJet is electrically connected to the control system (ECM) by the main
connector (Figure 2-2). The engine harness mating connector for the TecJet is
MS3106E24-28S. This mating connector should be torqued per the value
indicated in Figure 2-1.
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.
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.
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 2-2.
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Figure 2-1a. TecJet 50 Plus Outline Drawing
(TecJet 50 Plus Precision Flow is externally the same)
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Figure 2-1b. TecJet 50 Plus Outline Drawing
(TecJet 50 Plus Precision Flow is externally the same)
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Shielded Wiring
All shielded cable must be twisted conductor pairs. Do not attempt to tin (solder)
the braided shield. All signal lines should be shielded to prevent picking up stray
signals from adjacent equipment. Connect the shields to the correct pins on the
driver connector or wiring as specified in the wiring diagram. Do not connect
shields to the actuator ground. Wire exposed beyond the shield should be as
short as possible, not exceeding 50 mm (2 inches). The other end of the shields
must be left open and insulated from any other conductor. DO NOT run shielded
signal wires along with other wires carrying large currents. Where shielded cable
is required, cut the cable to the desired length and prepare the cable as
instructed below:
Strip the outer insulation from BOTH ENDS, exposing the braided or spiral
wrapped shield. DO NOT CUT THE SHIELD.
Using a sharp, pointed tool, carefully spread the strands of the shield.
Pull the inner conductor(s) out of 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. The shield
must be considered as a separate circuit when wiring the system. The shield
must be carried through connectors without interruption.
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 at the time of installation is required to ensure
satisfactory operation of the TecJet Gas Metering System.
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 connector. Steady state input current can reach 2.0 A, and transient input
current may reach up to 5.0 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 fast blow fuse.
Recommended maximum wire length from power source to TecJet based on an
18 V Power Supply: 16 AWG (1.3 mm²)—12 m (39 ft*)
*Rated transient torque may not be achievable with an 18 V power supply. Listed
lengths will provide at least 75% of rated transient torque.
Recommended maximum wire length from power source to TecJet based on a
24 V Power Supply: 16 AWG (1.3 mm²)—51 m (167 ft)
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CAN Hi In
CAN Lo In
CAN Shield
CAN Hi Out
CAN Lo Out
PWM In +
Keyswitch
Power In+
Power In -
TecJet 50
Plus
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)
M
JDiscrete/RS232 Common
RS232 Tx
VCAN Gnd
YDo Not Connect
The recommended wire size for W and Z (Power Supply Inputs) is
at least 16AWG. For all other I/O the recommended wire size is
at least 20AWG.
NRS232 Rx
Load
}
RS232 Serial
Communication
CAN ID2
CAN ID1
G
H
D
CDo Not Connect
Do Not Connect
Figure 2-2. TecJet Wiring Diagram
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Keyswitch
F = Keyswitch
The keyswitch is not active in all TecJet configurations. The keyswitch is used to
switch the TecJet in and out of a low power state (less than 200 mA input
current). A high signal (connected to supply [+]) 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 key switch input goes low, the valve will disable the driver
circuitry after the software has gone through a shutdown procedure.
PWM Input
K = PWM input (+)
L = PWM input (–)
The PWM input is configurable as the mass flow demand input. The PWM Input
is designed to be used with a push-pull type driver.
Input Magnitude: 7–32 V differential input
Input Impedance: 40 kΩ
Input Type: Single-ended, ground referenced
Frequency Range: 80–1100 Hz
Isolation: none
Resolution: 12 bits
Accuracy: 1.5% of full scale @ 25 °C
Temperature Drift: 300ppm/°C
Input Common Mode Range: At least ±50 V
Safe Input Common
Mode Voltage: At least ±50 V
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 is used on an engine. If one
TecJet 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.
TecJet CAN ID
CAN ID1
CAN ID2
“TecJet 1”
Battery + or Open
Battery + or Open
“TecJet 2”
Discrete Common
Battery + or Open
“TecJet 3”
Battery + or Open
Discrete Common
“TecJet 4”
Discrete Common
Discrete Common
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CAN Termination
P = Termination resistor
Q = Termination resistor
The internal termination resistor (120 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 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.
If the internal termination is used, other devices on the CANbus may
not operate properly when the TecJet 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 valve is disconnected.
CAN In
R = CAN high in
S = CAN low in
V = CAN GND
Pins R, S, and V are the CAN communication wires. Make sure that the correct
cable is used for connection to the CAN terminals (SAE J1939/11).
Voltage Level: 5 V
Isolation: 1000 Vrms (optically decoupled)
Type: The TecJet supports CAN 2.0B
Baud Rate: Configurable from 250 K to 1 Meg
CAN Out
T = CAN high out
U = CAN low out
V = CAN GND
The CAN output pins are internally connected to the CAN input pins. They are
provided for linking more than one TecJet 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 input pins.
If a second device is connected to the CAN output pins, this device
will lose communication if the TecJet valve is disconnected.
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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 case 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 like
the PWM input.
Input Impedance: 225 Ω
Input Type: 4–20 mA differential
Max Input Current: 25 mA ±2%
Input Common Mode Range: At least ±50 V
Common Mode Rejection Ratio: -60 dB minimum
Safe Input Common
Mode Voltage: At least ±200 V
Accuracy: ±1.5% of full scale @ 25 °C
Temperature Drift: 300ppm/°C
Status Output
E = Status Output
J = Discrete/RS-232 Common
The status output indicates whether the TecJet 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 is a high-side switch: it will be actively driven
to Battery (+) when "on" and pulled to Battery (–) through a resistor when "off".
Output Type: High Side Discrete Output Driver
Drive Current: 500 mA max (w/ 24 V supply and 48 Ω load)
Load Range: 48 Ω to 100 kΩ
RS-232 Serial Communication Service Port
M = RS-232 TX
N = RS-232 RX
J = Discrete/RS-232 Common
The access to the service port will be provided through the main connector. The
RS-232 communications will be provided for the purposes of configuring and
servicing the TecJet.
Isolation: None
Baud Rate: 38.4 Kbaud
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Chapter 3.
Description of Operation
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.
Due to typical noise levels in engine environments, hearing
protection should be worn when working on or around the TecJet™
valve/actuator.
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.
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 using the TecJet Service Tool. See
Chapter 6 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 0.56 Nm (0.41 lb-ft) of
torque, and the valve closes. If the flow demand source is configured for EGS
CAN or Jenbacher 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.
The TecJet is typically 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 that positions the
valve is disabled to minimize the amount of current drawn from the battery.
Normal Operation
If a valid flow demand is present, the valve begins normal operation. The TecJet
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.
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TecJet 50 Plus/TecJet 50 Plus Precision Flow Valve/Actuator Manual 26219
18 Woodward
Diagnostics
The TecJet may not return to minimum fuel for all faults. The engine,
turbine, or other type of prime mover should be equipped with an
overspeed, misfire, detonation detection shutdown device(s), that
operate totally independently of the prime mover control device(s) to
protect against runaway or damage to the engine, turbine, or other
type of prime mover with possible personal injury or loss of life
should the TecJet system fail. An independent fuel shutoff device
should also be used to shut off fuel flow in case the TecJet system
fails.
The valve continuously performs a variety of diagnostic checks. Diagnostic
events are classified as warnings, errors or status indications. The status output
indicates the overall status of the valve. For more detailed information and a
complete list of the diagnostics, see the User Guide in the TecJet Service Tool. A
brief summary follows:
Warnings:
A warning indicates a condition that may require an operator’s attention or
intervention. For example, the valve may be operating in conditions that are
outside its specification range, or a failure has occurred for which there is a back-
up mode of operation, possibly with reduced accuracy or performance. If any
warnings are active, the status output is “off”.
Errors:
An error indicates a problem that prevents the valve from operating. The valve
closes, if possible, and remains inoperable until power is cycled. If the error
persists, the valve requires service. If any errors are active, the status output is
“off”.
Status indications:
The valve provides the following status indications:
Zero flow detected—The flow demand is not present or is not valid. The
valve is closed and the status output is “off”.
Zero pressure detected—The pressure across the valve is essentially
zero, so no flow can occur. The valve is closed and the status output is “off”.
Flow not reached—The valve cannot achieve the demanded flow given the
present operating conditions (fuel gas temperature and pressure, delta
pressure, gas K and density). The status output is “off”.
Overall status OK—There are no errors or warnings, and the Flow not
detected, Zero flow detected, and Flow not reached status indications are
not true. The status output is “on”.
See Chapter 5 (Troubleshooting) for more information on non-normal operation.
Run Hours Counter
The valve maintains a running hours counter that can be viewed or reset with the
service tool. Running hours do not accumulate when the “Flow not detected”
status indication is true.
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