ComAp IG-NT Reference Manual page 8

AUT mode – (Stand-by)
Automatic mode is influenced by ProcessControl: Island enable, ParallelEnable, Synchro enable and
MFStart enable setpoints.
1 YES YES BOTH
2 NO YES BOTH
3 YES NO NO
4 NO NO NO
NO NO BOTH
NO NO REV
NO YES REV
NO YES NO
NO NO X
YES NO NO
YES NO NO
Following procedure corresponds to setting No.1 from table above.
1) Mains failure is recognized
Controller opens MCB when AMF settings: MCB opens on = MAINSFAIL.
a) After AMF settings:EmergStart del elapsed, Controller starts the gen-set. Controller opens MCB
after engine starts when AMF settings: MCB opens on = GENRUN.
b) If mains recovers during the start-up process, Controller closes MCB again after AMF settings:
MCB close del and stops the gen-set.
2) When the gen-set is above Underspeed level and the generator voltage is within limits (adjust in the set
point group Gener protect) Controller closes the GCB. If the generator voltage is out of the limits for
Engine params: Max stab time, Controller alarms the failure and stops the gen-set.
3) After mains recovers:
a) After AMF settings: Mains ret del Controller starts synchronizing to mains and closes the MCB and
unloads the gen-set.
b) After the AMF settings:BreakerOverlap delay Controller opens the GCB.
c) The gen-set is cooled down and stopped.
TEST mode
Use TEST mode for Gen-set start test if the Mains is OK or to transfer the load to the gen-set when Mains
fail is announced in advance.
Hint:
The controller does not respond to GCB ON/OFF , STOP, START in Return To mains = ENABLED.
Engine automatically starts, when TEST mode is selected.
Engine can start automatically without warning when pressing FAULT RESET after shut down alarm.
Mains parameters out of limits during synchronising
In case that mains parameters get out of permitted limits during synchronizing to mains (reverse or forward),
the regulation of gen-set speed and voltage according to mains frequency and voltage is interrupted. During
the state, when parameters reach out of limits, until "Mains fail" is issued, the engine speed and voltage
regulation output is kept on the last value.
Baseload
Process control: Load ctrl PtM = BASELOAD
Gen-set power is kept at value given by Process control:Base load setpoint.
Inteli NT SPtM, SW Version 2.4, ©ComAp –December 2009
IGS-NT-SPtM-2.4-Reference Guide.PDF
Function
YES SPTM application, stand-by, soft load transfer
X SPTM – long parallel, no Stand-by
YES SSB with break transfer;
Gen-set start is blocked.
NO
NO
Gen-set start is blocked. Binary output
NO
Ofl StartBlck indicates those states.
NO
YES
X
NO
NO
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