user manual

Page 27

Turbine starting and running

Always set-up and confirm the operation of your Auto-start installation on the test-

stand, before installing into your model.

The present version of auto start uses only one channel for the entire engine

functions: To trigger the auto start cycle, the process is as follows:

• The user raises the trim. "Ready" will appear on the GSU screen. The trim and stick

should be where the engine is supposedly to be to idle once running. If the trim is on

"stop" position, "Trim low" will be read on the GSU.

If higher than idle, "StickLo!" will be read.

• When "Ready" is displayed, the user should cycle the stick to full power and back to

idle.

• When the stick is at idle again, the start sequence begins.

• The glow-plug is powered and checked. Once hot, the starter is engaged at reduced

power (soft start) and the gas valve is energized. If the glow test fail, a "Glow Bad"

message is displayed, and if the starter fails to arrive a minimum RPM in 2 seconds, a

“start bad” message is issued, and the auto start function aborted.

• When the rotor arrives at more than the "ignition max rpm" programmed parameter

(default 4000 for K-80E), the starter is disconnected and the brake applied.

• When the rotor RPM fall below than the "ignition min. Rpm" parameter (default

2000), the starter is switched on again to raise the rotor speed to the "ignition max

rpm" and the cycle is repeated until the gas ignites or the system times out after 30s.

• When the thermocouple register a increase of 50ºC in temperature meaning that the

ignition have occurred, the starter is switched on immediately at reduced power,

increasing his power accordingly to the real rotor rpm. At the same time the pump is

switched on at “pump start point” power, and the fuel valve is opened.

• The engine begins to accelerate as soon as fuel begin to burn, and power of the

pump is being increased through the time at "fuel ramp" slope. Once rotor RPM

arrives to the RPM set in “rpm switch off gas” parameter (usually set at 3/4 of the

“starter off RPM”) the gas valve is closed, and when the RPM arrive at the predefined

"starter off RPM" value, the starter is switched off and the brake applied to it. The