IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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Binary outputs – Status information
Ready for load
The output closes when the engine is running, no 2
nd
level protection is active and the GCB is already closed
or is able to be closed (i.e. all generator parameters are within limits).
Stand-by ready
The output closes when the engine is ready for stand-by: SEM / AUT mode, no 2
nd
level protection active.
Gen-set active
The output closes together with Prestart output and opens together with achieving “still engine” condition
after the stop command. If the start sequence finishes with Start fail, the output opens after the last
unsuccessful start attempt.
Hint:
The output also closes if the engine begins to rotate spontaneously. It stays closed until “still engine”
condition is achieved.
Operational
The output is closed when no protection is active and the gen-set is ready for operation or is currently in
operation.
Ready
The output is closed, if following conditions are fulfilled:
- Gen-set is not running and
- No 2
nd
level protection is active (or not yet reset)
- The controller has no “engine running” indication from any source
- The controller is not in OFF mode
Not ready
The output is closed, if following conditions are fulfilled:
- The controller in OFF mode or
- Any 2
nd
level alarm is active or not yet reset
CrankProcedure
The output closes together with the first Starter activation and opens with the last Starter deactivation (either
“engine running” state achieved, or Start fail). During crank pauses, the output stays closed.
Cranking
Indication of cranking procedure.
Starting
The output closes together with Prestart output and opens with transition from Idle to Running state or with
Start fail output activation. During crank pauses, the output stays closed.
Idle run
The output closes if “engine started” condition is detected after start and opens with Starting to Running
transition.
Running
The output closes with transition from Starting to Running state. It opens with transition to Cooling state or if
any 2
nd
level protection gets active. It stays closed if the engine is loaded.
ForwardSynchro
The output is closed during forward synchronizing and opens when GCB status gets active (= GCB was
closed). The output can be used for external synchronizing module control.
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