InteliLite
NT
– AMF20/25, SW version 2.2, ©ComAp – September 2014 101
IL-NT-AMF-2.2-Reference Guide.pdf
Threshold level for D+ input is 80% supply voltage, activation delay is 1s (to override short firings
during cranking
– for example in cold conditions).
AUT Mode
The controller does not respond to buttons START, STOP, MCB ON/OFF, GCB ON/OFF. Engine
start/stop request is evaluated form Mains failure/return.
AMF sequence (simplified)
State
Condition of the transition
Action
Next state
Mains
Oper /
Mains
operation
Mains failed
1
or MCB feedback dropout
MCB Opens On
= MAINSFAIL
MCB CLOSE/OPEN off
EmergStart Del
timer
started
Mains failure
Mains failed
1
or MCB feedback dropout
MCB Opens On
= GENRUN
EmergStart Del
timer
started
Mains failure
Mains Flt /
Mains
failure
Mains voltage and frequency OK
MCB Opens On
= MAINSFAIL
After elapsing
MCB Close
Del
MCB CLOSE/OPEN
on
Mains operation
Mains voltage and frequency OK
MCB Opens On
= GENRUN
None
Mains operation
EmergStart Del
elapsed
MCB Opens On
= MAINSFAIL
Engine start sequence
performed, then
GCB CLOSE/OPEN on
2
Island operation
EmergStart Del
elapsed
MCB Opens On
= GENRUN
Engine start sequence
performed, then MCB
CLOSE/OPEN off, time
delay
Transfer Del
performed and GCB
CLOSE/OPEN on
2
Island operation
IslOper /
Island
operation
Mains voltage and frequency OK
MainsReturnDel
timer
started
Mains return
MainsRet
/ Mains
return
Mains failed
Island operation
MainsReturnDel
elapsed
GCB CLOSE/OPEN off,
then after
Transfer Del
MCB CLOSE/OPEN on
and then engine stop
sequence performed
3
Mains operation
1
Mains failed
means mains over/under -voltage, over/under -frequency, voltage asymmetry (preset
delay must elapse)
2
If during start-up sequence mains returns, then MCB is reclosed with delay
MCB Close Del (
if
opened, depending on
MCB Opens On
setpoint) and start-up sequence is interrupted.
3
If mains fails during stop procedure (cooling) again, stop sequence is interrupted, MCB opened and
GCB closed with delay
Transfer Del.
See also chapter
Circuit breakers timing.
Hint:
When the AMF function will start the engine than the engine will be running at least for the time which
is defined in
setpoint, even if the mains would return in the meantime.
