IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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Unsuccessful engine stop:
BO: Stop pulse
5s
BO: Stop solenoid
Stop time
BO: Fuel solenoid
RPM + pick - up signal > 0
Stop command issued, but
no reaction.
The cyclic stop attempts
continue until the engine
actually stops.
Stop time
In this moment the Stop time
elapsed, but the engine is still
moving. „Sd Stop fail“ alarm
appears.
The fuel or stop valve probably
stucked in wrong position.
“Forced” stop in still state:
BO: Stop pulse
BO: Stop solenoid
= Stop time
BO: Fuel solenoid
measured RPM = 0
Stop bu tton pressed (MAN
mode).
Stop solenoid activated for
Stop time period.
Stop pulse activated for 1s.
Spontaneous engine start-up:
B) BO: Stop solenoid
= 2+5s
A) BO: Stop solenoid
Stop time
BO: Fuel solenoid
measured RPM
„Engine running“ condition
detected. Alarm „Sd Stop fail“
appears.
„Still engine“ condition
achieved.
Stop time
A) Stop time long enough to
stop the engine.
B) Stop time too short,
additional Stop solenoid
activation needed.
The overlay is 2+5s since „still
engine“ condition achieved.
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