IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
Virtual Binary Inputs and Outputs (VPIO) please refer to the chapter about Shared Binary Inputs and Outputs
and Virtual Binary Inputs and Outputs.
NOTE:
Use pulse signals for control of circuit breakers. MCB ON COIL, MCB OFF COIL, MGCB ON COIL and MGCB
OFF COIL should be used to prevent sudden opening for a short period of time when the controller fails and
to ensure proper function of redundancy.
Automatic Mains Failure function in SPtM application
SPtM application contains complex AMF function. There are several setpoints that allows user to adjust the
function behavior. Detailed description is below.
When the Mains fail occurs the system is started with
adjustable delay (AMF setting:EmergStart del).
In some cases it may be crucial to choose when the MCB
opens after Mains failure). It is possible to choose whether the
breaker opens directly when Mains failure is detected or when
the generator is running. This is done via setpoint AMF setting:MCB opens on.
When the Mains parameters become OK again it is possible to adjust the delay time which
must elapse before the controller starts the return to Mains procedure. This delay is adjusted
by AMF setting:Mains ret del. This function is particularly useful when the Mains fail happens
several times in a row with short period of Mains being OK.
It is also possible to choose option that return to Mains needs manual confirmation before the
controller starts the return procedure. You can choose this by setpoint
AMF setting:RetFromIsland. For the full description of manual confirmation of return
procedure refer to the decription of the setpoint.
By default return to Mains (when the Mains parameters are OK again and
AMF setting:Mains ret del elapses) is done by reverse synchronization of gen-set group back
to Mains, soft unload of the gen-set and opening of its GCB or by opening GCB.
When it is not possible to synchronize to Mains (Parallel operation is not
enabled, Synchronization is not enabled, Synchronization is unsuccesfull
etc.), return with break may be enabled to ensure that the load returns to
Mains even though parallel operation is not possible.
AMF setting:ReturnWithIntr enables the return with break (the duration of
the break is given by the setpoint AMF setting:FwRet break). If return with break is disabled and it is not (for
whatever reason) possible to synchronize back to Mains, the gen-set stays running in Island operation even
though the Mains is OK.
In case that the genset is not able to start (e.g. it is not not in AUT mode etc.) the AMF
function recloses MCB back to healthy Mains after delay given by
AMF setting:MCB close del elapses.
InSPtM application there is also setting for the duration of breaker overlap available. This
time (given by the setpoint AMF setting:BreakerOverlap) defines maximal time for run in
parallel during return to once again healthy Mains (even though soft unloading is not
completed, after AMF setting:BreakerOverlap elapses the GCB is opened regardless of
load on gen-set).
Cleaning mode
Use the LBI Cleaning to set the gen-set to cleaning mode. Under voltage and under frequency protections
are blocked in this mode (Gener protect: Gen>V BOC, Gen<V BOC, Gen>f, Gen<f). It allows to switch off
the excitation of generator while the gen-set is washed. Under voltage and under frequency protections are
not active and do not stop the engine. Yellow warning Cleaning appears in alarm list.
Mains fails
Delay for Start
Start
Mains fails
Breaker opens
immediately
Brk opens on
gen-set run
Mains is OK
again
Delay before
return procedure
(Manual
confirmation)
Return
procedure
Synchro-return
not possible
Gen-set stays in
Island operation
Gen-set perform
return with break
No gen-set run
(Mains OK again)
Delay before
MCB reclosing
MCB recloses
Breaker overlap elapses
(soft unld not done)
GCB opens
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