WOODWARD TECJET 50 GAS CONTROL VALVE OPERATION AND CALIBRATI Caterpillar

In case of replacement for your TecJet 50 gas control valve, select one of these replace adjustment procedures:

* Programming parameters in the old TecJet 50 are known by the customer and Woodward, and can be copied by Woodward to the new TecJet 50 before installation (see [I] below).

* Programming parameters in the new TecJet 50 are unknown by the customer or Woodward, and have to be copied from the old TecJet 50 to the new TecJet 50 in the field (see [II] below).

[I] Downloading Parameters from the old TecJet 50 into the new TecJet 50 before Installation

1. Shut down the engine (if possible) according to the engine manufacturer's procedures.

2. Close the manual shut-off valve in the gas stream.

3. Disconnect the electrical connector from the TecJet 50 connector.

4. Remove the TecJet 50 gas control valve.

5. Discard the old sealant material or gasket from the gas pipe.

6. Put a new gasket on both sides of the TecJet 50, and install the new TecJet 50.

7. Check the TecJet 50 connection for gas leakages by opening the manual shut-off valve and the gas shut-off solenoid valve.

8. Connect the electrical connector to the TecJet 50 connector.

9. Open the manual shut-off valve.

[II] Downloading Parameters from the old TecJet 50 into the new TecJet 50 in the Field

1. Shut down the engine (if possible) according to the engine manufacturer's procedures.

2. Close the manual shut-off valve in the gas stream.

3. Disconnect the electrical connector from the TecJet 50 connector.

4. Connect a PC laptop computer to the TecJet 50 and start the Tjmon.exe monitor program.

5. Make a note of the following parameters:

* Qgn control: CAN / PWM single / PWM double / Analog

* Gas density in kg/nm³

* Wobbe index in MJ/nm³

* Physical limits in L/s

* Default Delta P

6. Remove the old TecJet 50.

7. Discard the old sealant material from the gas pipe.

8. Put a new gasket on both sides of the TecJet 50, and install the new TecJet 50.

9. Check the TecJet 50 connection for gas leakages by opening the manual shut-off valve and the gas shut-off solenoid valve.

8. Connect the electrical connector to the TecJet 50 connector.

9. Open the manual shut-off valve.

Impossible to Download Parameters from an old TecJet 50 to a new TecJet 50

The customer should keep a paper copy of the TecJet 50 set-up, so that all parameters can be manually entered if necessary.