Turbine Package Operators Manual
Chapter 1
Turbine Package System Overview
1-17
Electronic Control Unit (ECU)
The ECU is an integral part of the fuel system and interfaces with the fuel control valve actuator
and the turbine governor to provide accurate fuel control, utilizing a high-speed microprocessor
at its heart.
The ECU constantly receives fuel condition input signals, and uses this information to calculate
the correct position of the fuel valve according to the flow rates demanded by the turbine
governor. The ECU also provides feedback of valve position and fault conditions to the turbine
control system.
Fuel Burners
The burners incorporate main and pilot gas ports to introduce the correct proportion of fuel for
the combustion process during starting and turbine operation.
Igniter
An igniter (IG1 to IG6) is incorporated in each burner to provide a heat source to the fuel during
engine starting. The units are connected by high-tension leads to a high-energy spark generator.
Instrumentation
Instrumentation is provided to monitor the fuel system parameters and provide warning and
protective control functions if unsafe or damaging conditions are detected.
Position Monitoring
Position switches (ZS12 and ZS45) monitors the open/closed position of the off-skid block valve
and switches (ZS44 and ZS11) monitor the open/closed position of the off-skid vent valve.
Position switches (ZS178 and ZS5) monitor the open/closed position of the primary on-skid block
valve, switches (ZS207 and ZS208) monitor the open/closed position of the secondary on-skid
block valve and switches (ZS742 and ZS743) monitor the open/closed position of the vent valve.
The switches initiate a start inhibit signal if the any of the valves are wrongly positioned prior to
start.
Pressure Monitoring
Pressure transmitters (PT2 and PT181) monitor the gas supply pressure at the input and the
demand pressure at the output of the main gas fuel control valve respectively. The pressure
differential across the valve is used in conjunction with the valve feedback position to calculate
the approximate percentage fuel flow through the valve.
Pressure transmitters (PT220 and PT182) monitor the gas supply pressure at the input and the
demand pressure at the output of the pilot gas fuel control valve respectively. The pressure
differential across the valve is used in conjunction with the valve feedback position to calculate
the approximate percentage fuel flow through the valve.
Dynamic air pressure through the center casing is monitored by a pressure transmitter (PT200).
