Woodward TecJet 50 User manual

Installation and Operation Manual
TecJet™ 50 Gas Control Valve
Manual 36102 (Revision B)

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WARNING—OUT-OF-DATE PUBLICATION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 2001
All Rights Reserved

Manual 36102 TecJet 50
Woodward i
Contents
ELECTROSTATIC DISCHARGE AWARENESS .................................................. II
CHAPTER 1. GENERAL INFORMATION........................................................... 1
TecJet™ 50 Gas Control Valve..............................................................................1
TecJet 50 Monitoring Software...............................................................................2
Benefits of the TecJet 50........................................................................................2
CHAPTER 2. INSTALLATION.......................................................................... 3
Environmental Conditions ......................................................................................3
Wiring Requirements..............................................................................................4
Installation of the TecJet 50 ...................................................................................7
CHAPTER 3. OPERATION ........................................................................... 11
Pre-start Checks during Installation .....................................................................11
Configuration of the TecJet 50 .............................................................................11
Installation of the TecJet 50 Monitoring Software ................................................12
Description of TecJet 50 Monitoring Program......................................................13
Description of the TecJet 50 Menus.....................................................................16
Replacement of TecJet 50 Gas Control Valve .....................................................21
CHAPTER 4. TROUBLESHOOTING............................................................... 23
Introduction...........................................................................................................23
Error Codes ..........................................................................................................23
Messages .............................................................................................................25
CHAPTER 5. TECHNICAL SPECIFICATIONS .................................................. 26
TecJet™ 50 Specifications...................................................................................26
TecJet 50 Flow Capacity ......................................................................................27
CHAPTER 6. SERVICE OPTIONS ................................................................. 29
Product Service Options.......................................................................................29
Returning Equipment for Repair...........................................................................30
Replacement Parts ...............................................................................................31
How to Contact Woodward...................................................................................31
Engineering Services ...........................................................................................32
Technical Assistance............................................................................................33
DECLARATIONS ......................................................................................... 35
Illustrations and Tables
Figure 1-1. TecJet 50 Gas Control Valve...............................................................1
Figure 2-1. Preparing Shielded Wiring ...................................................................4
Figure 2-2. Shielded Wiring Connection ................................................................4
Figure 2-3. Correct Wiring to Power Supply...........................................................5
Figure 2-4. Incorrect Wiring to Power Supply ........................................................6
Figure 2-5. Single TecJet 50 ..................................................................................7
Figure 2-6. Multiple TecJet 50’s .............................................................................7
Figure 2-7. TecJet 50 Connector............................................................................7
Figure 2-8. TecJet 50 External Dimensions (8407-105) ........................................9
Figure 2-9. TecJet 50 Wiring Diagram (8407-105) ..............................................10
Figure 3-1. Example of Wiring Connections that Facilitate Monitoring of the
TecJet 50 .........................................................................................12
Figure 3-2. General TJMON Display....................................................................13
Figure 3-3. File Menu ...........................................................................................13
Figure 3-4. View Menu .........................................................................................14
Figure 3-5. Parameters Menu ..............................................................................15

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Illustrations and Tables
Figure 3-6. Diagnostics Menu ..............................................................................15
Figure 3-7. Help Menu..........................................................................................16
Figure 5-1. Flow Capacity for the TecJet 50, Version 1 .......................................27
Figure 5-2. Flow Capacity for the TecJet 50, Version 2 .......................................28
Figure 5-3. Flow Capacity for the TecJet 50, Version 3 .......................................28
Electrostatic Discharge Awareness
All electronic equipment is static-sensitive, some components more than others.
To protect these components from static damage, you must take special
precautions to minimize or eliminate electrostatic discharges.
Follow these precautions when working with or near the control.
1. Before doing maintenance on the electronic control, discharge the static
electricity on your body to ground by touching and holding a grounded metal
object (pipes, cabinets, equipment, etc.).
2. 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.
3. Keep plastic, vinyl, and Styrofoam materials (such as plastic or Styrofoam
cups, cup holders, cigarette packages, cellophane wrappers, vinyl books or
folders, plastic bottles, and plastic ash trays) away from the control, the
modules, and the work area as much as possible.
4. 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.
CAUTION—ELECTROSTATIC DISCHARGE
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.

Manual 36102 TecJet 50
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Chapter 1.
General Information
TecJet™ 50 Gas Control Valve
The TecJet™ 50 is an electronic gas injection valve for single point injection that
integrates sensors and electronics. The TecJet 50 valve ensures correct gas flow
under all circumstances.
Working in conjunction with an engine management system, such as the
Woodward EGS-01, the TecJet 50 receives the signal indicating the desired gas
flow and gas density from the engine management system. The engine
management system will monitor the load and speed of the engine and provide
the TecJet with the gas flow signals accordingly.
The microcomputer situated inside the TecJet 50 will convert the desired gas
flow signal into a valve position that directly corresponds to the desired gas flow.
The valve position will also be adjusted for such variables as:
• Gas inlet pressure
• Gas temperature
• The pressure over the valve
• The density of the gas
The TecJet 50, in combination with an engine control system, forms an ideal
solution to gas engine control, regardless of gas specification (pressure,
temperature, and composition).
Figure 1-1. TecJet 50 Gas Control Valve

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NOTE
The TecJet 50 gas control valve is suitable for gas engine applications
within the power range of 200–2000 kW (depending on gas pressure and
composition).
NOTE
In the case of variation in gas flow demand, the TecJet 50 gas control valve
is able to respond extremely quickly. The benefits of such fast response
result in good engine behavior—low fuel consumption, accurate emission
levels, and gas flow that completely matches load demand. The TecJet 50
can easily be installed and monitored using a PC and the TecJet 50
software.
TecJet 50 Monitoring Software
The TecJet 50 monitoring software provides user-friendly installation and
adjustment of the TecJet 50, via your PC. In addition the monitoring software
fulfills the following functions:
• Setting configuration parameters
• Monitoring the status of the TecJet 50
• Tracking gas output variables
For more information on the installation and function of the TecJet 50 monitoring
software, see Chapter 3 (Operation).
Benefits of the TecJet 50
The TecJet 50 revolutionizes gas engine fuel control, increasing the possible
applications of gas engines and ensuring safe and effective operation, regardless
of gas composition.
Advantages of installing the TecJet 50 intelligent fuel metering system, in
conjunction with an engine management system, are:
• Integrated sensors and electronics
• Extremely fast response to flow commands
• Microprocessor-based mass gas flow control
• Accurate over the entire gas flow range
• Highly accurate gas metering device
• Compensates for fluctuations in both gas temperature and gas pressure
(density)
• Bi-directional communication performed by CAN bus
• Requires only analog or digital signal stating the desired gas flow and
supply voltage to instigate correct valve positioning with regards to desired
gas flow
The Woodward EGS-01 engine management system forms the ideal gas control
partnership with the TecJet 50 gas control valve. However, the TecJet 50 is
suitable to work in conjunction with the complete range of available engine
management systems.

Manual 36102 TecJet 50
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Chapter 2.
Installation
CAUTION—ELECTROSTATIC DAMAGE
The TecJet™ 50 contains electrostatic-sensitive components which can be
damaged by static electricity from the human body. Before you install the
TecJet 50, read the Electrostatic Discharge Awareness precautions on page
ii, and discharge the static electricity on your body to ground.
Environmental Conditions
These environmental conditions must be met when installing or running a TecJet
50:
Ambient Operating Temperature
The TecJet 50 must be operated within a temperature range of –20 to +85 °C
(–4 to +185 °F), although the TecJet 50 will survive a soak temperature of 105 °C
(221 °F) caused by engine shutdown.
Storage Temperature
The TecJet 50 must be stored without power applied within a temperature range
of –40 to +100 °C (–40 to +212 °F).
Gas Temperature
The TecJet 50 requires a regulated gas temperature in the range of 30–60 °C
(86–140 °F).
Humidity
The TecJet 50 requires an ambient relative humidity from 0% to 95%, non-
condensing. The maximum level of relative humidity of the gas that is processed
by the valve is 80%.
Mechanical Shock and Vibration
The TecJet 50 is designed to withstand vibration and shock according to the
following standards:
Vibration, Swept Sine, SV3 5G, 2.5 mm, 5–2000 Hz, 3 h min/axis, 90 min dwells
MS 810C, M514.2, Curve J (Mod)
Vibration, Random, RV2 0.1 G²/Hz, 10–2000 Hz, 3 h/axis, 12.8 Grms
MS202F, Method 214A, Test Condition D
Shock, MS1 40 G, 11ms sawtooth Pulse
US MIL-STD-810C, M516.2, PI

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Electromagnetic Compatibility
The TecJet 50 complies with the electromagnetic emissions and immunity
requirements as specified below:
• EN 61000-6-4, Emission Criteria
• EN 61000-6-2, Immunity Criteria (see Note)
NOTE
The power for the TecJet 50 must be provided from a protected power
source that is compliant with the requirements of EN 61000-6-2. The output
of the power source must limit the common mode transients caused by
surge transients to less than 50 volts. The I/O cabling for the TecJet 50
should be limited to less than 30 meters in length. The TecJet 50, combined
with the power supply and cable limitation, will comply with the
requirements of EN 61000-6-2 and allow the system containing the TecJet 50
to be compliant with the EMC Directive.
Wiring Requirements
Shielded Wiring
• Use shielded wires for the signal lines to prevent interference from other
electrical equipment (see Figure 2-1).
• Prepare the shielded wires as shown in Figure 2-1.
• Connect the shield to the nearest chassis ground, leaving the opposite end
of the shield open. Ensure that the shield is properly insulated (see Figure
2-2).
• Do not install shielded wires directly next to high-current wires.
Figure 2-1. Preparing Shielded Wiring
Figure 2-2. Shielded Wiring Connection
Cable Length Requirements
Signal Type Signal Details Max. Cable Length
Analog 0–5 Vdc 15 m (49 ft)
PWM 75–150 Hz 15 m (49 ft)
DPWM 75–150 Hz 15 m (49 ft)
CAN 125 Kbits/s 530 m (1739 ft)
CAN 250 Kbits/s 270 m (886 ft)
CAN 500 Kbits/s 130 m (427 ft)
CAN 1 Mbit/s 40 m (131 ft)
RS-232 9600 bits/s 15 m (49 ft)
ISO9141 9600 bits/s 15 m (49 ft)

Manual 36102 TecJet 50
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Electrical Connections
See the wiring diagram (Figure 2-9) for complete details of electrical connections
to the TecJet 50.
For detailed information concerning the different signal inputs (Analog, PWM,
Dual PWM (DPWM), CAN, CAN & PWM, EGS, and C28), see the Description of
the TecJet 50 Menus section in Chapter 3.
Power Supply Requirements
The input power supply to the TecJet 50 is rated at 18 to 32 Vdc, 24 Vdc
nominal. It is protected from reverse voltage connections and up to +80 V on its
input. The following internal voltages are generated:
• +5 Vdc ±5% @ 400 mA max. non-isolated
• +13 V ±10% @ +40 mA non-isolated
• -13 V unregulated @ –3 mA non-isolated
See Figures 2-3 and 2-4 for details on correct power supply wiring for the TecJet
50.
CAUTION—POWER WIRING
Do not power other devices with leads common to the TecJet 50, and avoid
long wire lengths.
CAUTION—FUSE REQUIRED
The TecJet 50 must be fused. Failure to fuse the TecJet 50 could, under
exceptional circumstances, lead to personal injury, damage to the control
valve and/or explosion.
Figure 2-3. Correct Wiring to Power Supply
NOTE
Power must provide transient protection (see Electromagnetic Compatibility
earlier in this chapter).

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6 Woodward
Figure 2-4. Incorrect Wiring to Power Supply
CAUTION—NEGATIVE/POSITIVE GROUND SYSTEM
A negative ground system is shown. If a positive ground system is used, the
switch and control fuse must be located in series with the battery (–) and the
terminal on the Woodward control. The positive terminal becomes chassis
ground.
NOTE
If the TecJet 50 is installed in combination with an EGS-01 engine control,
the TecJet 50 will take the power supply from the EGS-01 engine control.
Termination Resistor for CAN Communication
If CAN communication is used between the TecJet 50 and the engine control
system, a termination resistor of 120 W between pin B and pin S must be
installed on the TecJet 50 (see Figure 2-5). The termination resistor on the
TecJet 50 connector will prevent disturbances and/or reflections of CAN signals.
If your application consists of multiple TecJet 50’s, then pins B and S of the first
TecJet 50 should be connected to pins N and V of the second TecJet 50.
Connect the termination resistor between pins B and S of the second TecJet 50.
For further details, see Figures 2-6 and 2-9.
NOTE
The termination resistor must always be connected through pins B and S of
the last TecJet 50 in an application using multiple TecJet 50’s. See Figure
2-6 for further details.

Manual 36102 TecJet 50
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Figure 2-5. Single TecJet 50
Figure 2-6. Multiple TecJet 50’s
Figure 2-7. TecJet 50 Connector
* See Figure 2-9 for further details on CANDID harness coding.
Installation of the TecJet 50
NOTE
The TecJet 50 can be installed upstream or downstream of the turbocharger.
However, installation of the TecJet 50 downstream of the turbocharger is
only possible if the boost pressure is less than 200 kPa (29 psi).
CAUTION—CLEAN GAS
Ensure that all dirt has been blown out of the gas stream, upstream of the
TecJet 50, before installing the TecJet 50 gas control valve. The pre-fitted
TecJet 50 filter is only for the purpose of filtering welding deposits and
Teflon tape particles during the initial start-up.
CAUTION—GAS PIPE FLANGES
Before installation of the TecJet 50 to the gas pipe, prepare the gas pipe with
two flanges which are the same size as the flanges on the TecJet 50 (see
Figure 2-8) for further details.

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8 Woodward
Installation of an upstream filter is highly recommended for all applications. The
preferred TecJet 50 filter is 50 µm.
• Install the TecJet 50 between the two flanges that are fitted onto the gas
pipe (see Figure 2-8).
• Place a gasket between the TecJet 50 flange and the flange on the gas
pipe.
• Connect the TecJet 50 flange to the flange on the gas pipe on both sides,
according to DIN 2501 (DN80, PN 10/16) for Europe, or to ANSI B (16,5 3”,
125/150 lb) for North America (see Figure 2-8).
• The TecJet 50 should preferably be supported using a bracket. Use the four
screw holes (M8x16) located at the bottom of the housing to install the
TecJet 50.
NOTE
The TecJet 50 must be installed horizontally, with the electronics at the top-
side, and the connector located at the outlet side of the valve. The centerline
of the TecJet 50 should be parallel to the centerline of the crankshaft in
order to avoid severe vibration levels in the moving direction of the TecJet
50 metering piston (see Figure 2-8).

Manual 36102 TecJet 50
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Figure 2-8. TecJet 50 External Dimensions (8407-105)

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Figure 2-9. TecJet 50 Wiring Diagram (8407-105)

Manual 36102 TecJet 50
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Chapter 3.
Operation
Pre-start Checks during Installation
Be sure to complete these steps before you start the engine:
• Check for correct wiring (see Figure 2-9).
• Check the TecJet™ 50 for signs of damage, and broken or loose
connections. Make any necessary repairs to the TecJet 50.
• Check the connection between the flange of the TecJet 50 and the flange
used by the engine manufacturer, on both sides of the connection. Check
for gas leakages from the connection and, if necessary, also from the
TecJet 50 (only in the case of repair and/or maintenance of the valve).
• Always ensure that the TecJet 50 is installed using a bracket. Also check
the connection between the bracket and the TecJet 50.
• Check that the TecJet 50 is installed in the correct direction according to the
gas flow.
• Check that you have selected the correct communication interface for your
TecJet. This is visible in the “FLOW INPUT” window of the TecJet 50
monitoring program. It is in this manner that you are able to communicate
with your engine management system.
Configuration of the TecJet 50
WARNING—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.
• Connect a PC to the TecJet 50 (see the next section, Installation of the
TecJet 50 Monitoring Software) to configure your TecJet 50. If necessary,
contact Woodward for details of your parameter settings. For instructions on
how to use the TecJet 50 Monitoring system, see the section Description of
TecJet 50 Monitoring Program later in this chapter. For more information
about the TecJet 50 Monitoring system, see the TecJet 50 Monitoring Help
File.
• Apply power to the TecJet 50.

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Adjust the following application specific parameters of your TecJet 50 before you
start the engine:
Window Adjustment
Fuel Parameters Window Adjust the Density of the gas.
Adjust the “Wobbe index act. gas” and the “Wobbe
index ref. gas”. Both Wobbe indexes must be equal to
each other and set to the Wobbe index of the current
gas supply to the engine.
Default Tables Window Adjust the “Qgn”, “Delta P”, “FGP”, and “FGT”
parameters, if desired.
CAN interface Window Adjust the CAN interface parameters.
PH-Limits Window Adjust the physical limits for “Delta P”, “FGP”, and
“FGT”, if desired.
Version Info Window Check if the right TecJet 50 and Co-processor are
loaded. Check the ROM parameter set.
Flow Input Window Select the type of communication, and set U0 and U1
to the number of counts for your application. See table
below.
Type U0 / U1
Analog 0—1023
PWM PWM signal varies between the 5% (224) and 95%
(3910) counts
DPWM 0—4095
CAN 0—65536
Start the engine according to the engine manufacturer’s instructions.
Installation of the TecJet 50 Monitoring Software
Load the TecJet 50 software onto your PC:
1. Connect the laptop with cable to the PC connector, which is connected to the
TecJet 50 connector. This will enable monitoring of the TecJet 50.
2. Insert the “TecJet 50 Software” disk into your drive A.
3. Start MS-DOS or the Window Explorer and go to drive A to copy the TecJet
50 files.
4. Copy the files Tjmon.exe, Tjmon.c16, and Tjmon.h16 to your personal
directory.
5. Go to the Tjmon.exe file and press Enter or double click. The TJMON display
will appear on the screen, as shown in Figure 3-2.
6. Go to the “Flow Input” window and select the type of flow command for your
TecJet 50 (Analog, PWM, CAN, etc.).
Having loaded the monitoring program onto your PC, proceed by following the
on-screen instructions. For further explanation of the TecJet 50 monitoring
program, see the following section, Description of TecJet 50 Monitoring Program.
Figure 3-1. Example of Wiring Connections that Facilitate Monitoring of the
TecJet 50

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Woodward 13
Description of TecJet 50 Monitoring Program
If you have opened the Tjmon.exe file, the TJMON display will appear on your
screen (see Figure 3-2). The menu bar on the TJMON display provides a set of
commands and settings to allow monitoring and configuring the TecJet 50 gas
control valve. Each menu contains several options that are commands, or links to
further menus.
The menu bar consists of the following menus (see the appropriate section for a
brief overview):
• “File” menu
• “View” menu
• “Parameters” menu
• “Diagnostics” menu
• “Help” menu
For further details of each menu option, see the following section, Description of
the TecJet 50 Menus.
Figure 3-2. General TJMON Display
File Menu
The File menu contains standard options for saving or retrieving parameter files
(see next section for more details).
Figure 3-3. File Menu

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View Menu
The “View” menu allows you to view the output parameters contained in the
system. These can be either running levels or error conditions (see next section
for more details).
Figure 3-4. View Menu

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Parameters Menu
The “Parameters” menu contains windows into which you are able to enter and
modify the various fuel, flow or CAN parameters (see next section for more
details).
Figure 3-5. Parameters Menu
Diagnostics Menu
The “Diagnostics” menu provides you with the ability to access information on
default tables and physical limitations (see next section for more details).
Figure 3-6. Diagnostics Menu

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Help Menu
The Help menu is divided in two windows: “Contents” window and “Context
sensitive” window. The main part of this window is used to display help
information about relevant topics.
The “Contents” window gives a brief introduction to the application.
The “Context Sensitive” window provides you with information that assists you in
the action that you are currently performing.
Figure 3-7. Help Menu
Description of the TecJet 50 Menus
Menu / Window Parameter Function
Open To retrieve a saved set of parameter settings from the disk, select
“Open” from the File menu.
Save To store the TecJet 50 parameter settings to disk, select “Save” from
the file menu.
Save As To make a new parameter file on disk, select “Save As” from the File
menu.
New Permits you to reset the current parameter settings to their default as
encoded in the software.
DOS Shell If you want to go to DOS, select “DOS” from the file menu so that the
normal window disappears. Type “exit” to return to your TJMON
display.
File Menu
Exit If you want to quit the application, select “Exit” from the File menu.
Qgn Normal gas flow, at ref. conditions (0 °C/32 °F, 1013 mbar).
Delta P Equals the absolute pressure differential over the valve (mbar).
FGP Fuel gas pressure (absolute) [mbar].
FGT Fuel gas temperature [°C].
Act Pos Actual valve position [mm].
Dens (norm) Normal gas density 0 °C, 1013 mbar [kg/m³].
View Menu/
Flow Inputs
Wobbe corr The Wobbe corr. corrects on the gas flow, when the Wobbe index act.
is higher or lower than the Wobbe index ref., so that the energy flow
stays the same.
Example:
Wobbe Corr. = Wobbe index ref. = 40 / Wobbe index act = 50.
In this case the Wobbe index act is 20% higher, which means that you
have to lower the gas flow with 20% to remain the same energy flow.
Qg (calculated gas flow) = Qg (based of ref. Wobbe) * Wobbe Corr.