InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf, ©ComAp – April 2015
7.2 Modes
7.2.1 OFF mode
InteliMains NT has no influence at gen-set group.
If mains voltage is within limits and no mains alarm is active, MCB is closed after
AMF settings:MCB close del if AMF settings:MCB opens on = MAINS FAIL.
If AMF settings:MCB opens on = GEN RUNNING, MCB stays closed all the time, regardless of the
mains condition.
MCB application - if the controller is switched to OFF mode while the gen-sets are running and there
is voltage on the bus, MCB is not closed before bus voltage disappears.
MGCB application – if the controller is switched to OFF mode while the gen-sets are running and
there is voltage on the bus, MGCB is opened and after AMF settings:FwRet break MCB is closed (if
there is Mains voltage).
Binary output SYS START/STOP is not active.
7.2.2 MAN mode
It is possible to close/open breakers manually under supervision of IM-NT controller which doesn’t
allow to close simultaneously breakers without synchronizing (e.g. MCB and MGCB).
If the Mains fails, controller opens MCB if AMF settings:MCB opens on = MAINS FAIL. After the
Mains returns, MCB stays opened. Otherwise MCB is controlled manually by pressing MCB ON/OFF
button or closing MCBBUTTON binary input.
MGCB application – if the Mains fails and group of gen-sets is started and there is voltage on the
bus, then MGCB can be closed anytime by pressing MGCB ON/OFF button.
Pressing of Start/Stop buttons closes/opens binary output SYS START/STOP, i.e. cause start/stop of the
gen-set group.
7.2.3 AUT mode
Controller performs automatically sequences after Mains failure, closing/opening MCB and MGCB,
Peak shaving function, closing of SYS START/STOP binary output.
MCB is opened according to setpoint AMF settings:MCB opens on after Mains failure or after the
gen-sets are running.
MGCB is closed after the start of gen-set group as soon as an appropriate load reserve is achieved
(SYST RES OK binary output closed). If Mains fails and MCB is opened then MGCB stays closed
unless voltage on the bus goes out of the limits.
Controller reacts on binary input REM START/STOP – if this input is closed, controller activates binary
output SYS START/STOP in order to start gen-set group. In MGCB application, MGCB can be closed
before the output activation (see also setpoint Process control:MGCBparalClose).
7.2.4 TEST mode
7.2.4.1 MCB application
In TEST mode gen-sets are automatically started (activation of binary output SYS START/STOP) and
connect to the bus. System goes to parallel to Mains operation and remains there. The group required
power is given by currently selected mode of Load control.
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