InteliSys
NT
-AFR-Abstract, SW version 1.0, ©ComAp – December 2006 35
IS-NT-AFR-1.0-Abstract.pdf
AFR control stays active during short (up to 1 sec) engine power drop out (no jump to
LoPwr position
).
En
gine pow
er - k
W
Protections
MAP control fail
Engine shut down is detected and Binary output “MAP ctrl fail” is closed when actual MAP value is out
of range. See setpoints
AFR control
:
MAP difference
,
MAP timeout
. Protection is active when genset
power >
Low MAP power
.
MAT sensor fail
Engine Slow stop (Cool down) is activated when MAT sensor fail is detected.
Misfiring
External Misfiring detection unit output must be connected to InteliSys binary input Misfiring.
Knocking
External Knocking detection unit output must be connected to InteliSys binary input DxLoad reduct.
Oxygen range
Engine Slow stop (Cool down) is activated when actual O2 (from UEGO input) is out of range. See
Analog input UEGO.
Hint:
MAP control fail, Misfiring, Knocking, Oxygen range protections are activated from
Low MAP power.
Active Sprinkler function blocks engine stop due to MAP control fail, Misfiring, Knocking and Oxygen
protection - engine stays running even if any from those protections is active.
Sprinkler protection does not block MAP and MAT sensor fail detection - engine will stop when MAP or
MAT sensor fail is detected, even if BI Sprinkler is active.
Not configured MAP or MAT analog input indicates sensor fail alarm.
Gas Valve test procedure
Test is based on the external automatic unit that put pressure between two closed Gas valves and
measures pressure value stability. Test is activated prior to engine start by InteliSys Binary output
GasVTest run. InteliSys waits for adjustable delay for test result - Binary input GasVTest OK must be
closed within this time. Engine starts at any time during Gas valve test procedure when Binary input
GasVTest OK is closed. Engine shut down is detected (Sd GasVTest message in AL and HST) when
no positive feedback (GasVTest OK) is received during adjustable delay
GasVTest del
. Gas Valve
TEST procedure is skipped during Automatic Mains Fail gen-set start to short black-out time.
