ComAp IG-NT - Page 13

IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
13
SEM
In SEM mode, pressing of START or STOP buttons performs a predefined sequence:
1) START – starts the engine, synchronizes and runs in parallel.
2) STOP – softly unloads the gen-set, opens GCB, provides cooldown and stops the engine.
3) In case of mains failure and Process control: MFStart enable set to YES, allows automatic start/stop
same as in AUT mode.
AUT mode – (Stand-by)
In AUT mode genset can’t be controlled by the front panel buttons of the controller. Controller function can
be different depends on selected Application mode (SPtM, SPI and MINT) as described below.
SPtM application:
Automatic mode is influenced by ProcCtrlSingle: Island enable, ParallelEnable, Synchro enable and
MFStart enable setpoints.
No.
Island enable
Parallel enable
Synchro enable
MFStart enable
Function
1
YES
YES
BOTH
YES
SPTM application, stand-by, soft load transfer
2
NO
YES
BOTH
X
SPTM – long parallel, no Stand-by
3
YES
NO
NO
YES
SSB with break transfer;
Gen-set start is blocked. Binary output
OflStartBlck indicates those states.
4
NO
NO
NO
NO
Gen-set start is blocked. Binary output
OflStartBlck indicates those states.
NO
NO
BOTH
NO
NO
NO
REV
NO
NO
YES
REV
NO
NO
YES
NO
YES
NO
NO
X
X
YES
NO
NO
NO
YES
NO
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.