M
Ingenieurbüro CAT, M. Zipperer GmbH +49-7634-5056-800
Wettelbrunner Straße 6
45
79282 Ballrechten-Dottingen
www.jetcat.de
GERMANY
Instruction manual JetCat-PRO engines, 1.7 - V12.01V
Engine Running States
The
JetCat engine
progresses through several operating states, from ignition to the cool down process. The
transitions of these states are automatically controlled by the ECU and by user commands. The current value is always
displayed on the GSU screen in the
STATE
selection in the
RUN
menu. When the engine is starting, the GSU will also
display the current state on the bottom line of the display. Whenever the engine is in cooling mode or the starter is
tested with the
Spool
key, the top line of the GSU display will flash “! – Cooling - !”.
Explanation of the engine States
Table 1
Value
Explanation
-OFF-
AUX switch in the
Off
position and/or the throttle trim in the
Off
position. All LEDs are
off. Turbine is off (preventing starting).
Standby /
START
AUX switch positioned to the
Start / Standby
position, throttle trim at maximum and
throttle stick at idle. The LED chase sequence is started from green to red to yellow,
continuously. When throttle stick is advanced to the maximum position, the starter
motor engages to spin the rotor. When RPM reaches a pre-programmed value, the
starter motor’s voltage is removed and the engine is ready to
ignite
.
Pre Heat 1
The burner is pre-heated for 3-7 seconds (the starter motor is not running)
Pre Heat 2
The starter motor spools up the engine to it’s ignition. After another few seconds the ignition
of the engine is engaged by injecting kerosene into the Kerosene-Igniter. The pump and the
internal starting fuel solenoid will begin pulsing.
MainF-On
Main fuel solenoid opens and kerosene is modulated into the engine.
AccelDly
Delay while combustion chamber is preheating. Waiting for a rise in EGT.
Ker.Full
Starting fuel solenoid closes and all the fuel is now directed to the main injectors. The red
Pump running
LED turns on and will stay illuminated as long as the pump operates.
Stabil.
Turbine successfully accelerates to the idle RPM, then automatically increases speed to about
30% higher RPM. When this speed is maintained consistently for at least one second, the
engine will proceed to the next state (
Learn LO)
.
Learn LO
In this state, the engine automatically decreases RPM to the idle speed.
As soon as idle speed is attained, with the throttle stick in the idle position, the engine will
proceed to the next state (
RUN (reg.)
).
Run (reg.)
Turbine in the normal running state; the throttle stick will regulate engine thrust.
During this operant condition, the green
OK
LED will illuminate, indicating that pilot has
control. (red LED is already illuminated)
RUN (regulated)
continues, until the engine is switched off.
Auto Off
The AUX switch placed in the
Auto Off
position.
Turbine automatically increases RPM if at idle and remains at that RPM for a few seconds,
before transition to the next state (
Slow Down)
.
Slow Down
During this state, the fuel shut-off valve is closed and the fuel pump is stopped.
The green
OK
LED blinks and the GSU displays !-Cooling-!, indicating
Slow Down
This condition will continue, until all the following parameters are met:
Turbine speed less than 800 RPM
EGT is less than 100 degrees C.
The AUX switch is moved to the
Off
position and throttle trim is moved to the minimum
position
