InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf,
©ComAp – April 2015
58
7.2.4.2
Test on Load in MCB application
This function is activated when T
EST ON
L
OAD
Binary Input is activated and gets deactivated when the
Binary Input is deactivated. The load is taken over by gen-sets and MCB is opened. If the Mains fails
during the test, load is transferred to the gen-sets. If there are not enough gen-sets (running with GCB
closed) to cover the actual load, alarm is issued WrnTstOnLdFail and MCB stays closed. If the load
goes down alarm is then deactivated and MCB is opened.
N
OTE
:
The settings of the controller must allow the Test on Load function to transfer the load to the gen-set
group. If this is not allowed (e.g. SysBaseLoad is 0 kW), the system will not transfer the load.
7.2.4.3
MGCB application
Gen-sets are started and synchronized on generator bus. If the
ProcessControl:
MGCBParalClose
is
set
to
MCB
CLOSED,
MGCB
is
opened
when
switching
to
TEST
mode.
If
ProcessControl:
MCB opens on
is set to MAINSFAIL, MGCB is opened immediately after switching to
TEST mode. If
ProcessControl:
MCB opens on
is set to GEN RUNNING, MGCB is opened when the
first gen-set reaches Running state.
7.2.4.4
Test on Load in MGCB application
This function may be initiated by activation of Binary Input T
EST
ON
L
OAD
or by pushing of MCB or
MGCB button.
Activation and Deactivation by T
EST ON
L
OAD
Binary Input.
Red area is Test on Load with
synchronization. Blue area is Test on Load with break.
TEST mode
activated
Binary
InputTest
on Load
switched on
Test on Load
cannot be done
Test on Load with
synchronization
Test on Load
with Break
Parallel enable
=
ANY SETTING
Synchro enable
=
NONE or REVERSE
Gen-sets
start
Setpoint
Island
enable
DISABLED
ENABLED
Setpoints
Parallel
enable
and
Synchro
enable
Parallel enable
=
ENABLED
Synchro enable
=
BOTH or FORWARD
Synchronization
Passed
Failed
Alarm and load
remains on
Mains
Mains unload
Load in Island
Parallel enable
=
DISABLED
Synchro enable
=
ANY SETTING
MCB opens
FwResBreak
MGCB closes
Load in Island
Activation diagram
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