IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
Binary input: PrestartBypass
Use this input to bypass the prestart phase of the start-up procedure and activate
the Starter output immediately after start command has been issued.
This input is typically used to skip preglowing of the engine when the engine is
already warm. A built-in PLC module Comparator with hysteresis attached to the
engine temperature value can be used to provide the "engine warm" binary signal,
which is then internally configured onto this logical binary input.
Binary input: Startblocking
Engine start is disabled while this input is active. NotReady state is displayed on
the controller main screen and the message Start blocking is displayed in the
Alarmlist.
Use this input to disable temporarily the genset to be started e.g. from an higher-
level automation device such as PLC.
NOTE:
The genset will not be stopped if the input is activated while the genset is running.
Binary input: Sd override
If the input is closed, all 2nd level protections are overriden to allow engine run in
an emergency situation, e.g. when the gen-set works as a power supply for fire
extinguishing equipment.
All protections are displayed in Alarmlist and recorded into history, however the
controller leaves the gen-set in operation. If there are any protections still active or
not reset in the moment when the input is deactivated, the controller will react to
them in a standard way.
Following protections are not overriden by this input:
Emergency stop
Overspeed
Underspeed (only if Fuel solenoid = GAS ENGINE)
Binary and analog protections configured as Sd override type. In fact this
protection type means "Unoverridable shutdown", i.e. it works the same
way as standard shutdown protection, however it can not be overriden
(blocked) by the Sd override input.
Binary input: GCB disable
The input is used to disable issuing the GCB closing command.
If the input is active during synchronizing, the controller will keep the
genset synchronized without issuing the GCB closing command until the
input is deactivated or Sync timeout is elapsed.
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