The TecJetTM 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 the valve is fuel control for gas-fueled reciprocating engines controlled by an electronic engine control system.
Connections to the TecJet 52
The TecJet 52 has the following connections to the ECM (Engine Control Module), and the engine harness:
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.
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 require additional setup. The features identified below are described in Chapter 5. Briefly, the programmable features include:
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, 200, 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
- * Load the configuration into the control
Detailed descriptions of software installation are available in Chapter 5.
Figure 1-1a. TecJet 52 Outline Drawing
Figure 1-1b. TecJet 52 Outline Drawing