InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf, ©ComAp – April 2015
EXAMPLE:
This is an example of return from Test on Load function when the same setting are applied as in
previous example and AMF setting:ReturnTo Mains = ENABLED.
Logical Binary Input TEST ON LOAD is deactivated. Because Parallel operation is not allowed controller
performs return with break. Because return to Mains is enabled, controller opens MGCB, waits for
AMF Settings:FwRetBreak and closed MCB. See the figure below for detailed path.
Activation by pushing MCB or MGCB button. This is available only if
AMF settings:ReturnTo mains is set to DISABLED.
TEST mode
activated
Gen-sets
start
Setpoint Island
enable
Test on Load
cannot be done
DISABLED
ENABLED
Setpoints Parallel
enable and Synchro
enable
Button
pushed
MGCB
MCB
Setpoint Island
enable
DISABLED
ENABLED
Test on Load
with Break
MCB opens
FwResBreak
MGCB closes
Load in Island
Parallel enable =
ENABLED
Synchro enable =
BOTH or FORWARD
Test on Load with
synchronization
Synchronization
Passed
Failed
Alarm and load
remains on
Mains
Mains unload
Load in Island
Parallel enable =
DISABLED
Synchro enable =
ANY SETTING
Parallel enable =
ANY SETTING
Synchro enable =
NONE or REVERSE
Test on Load
cannot be done
Setpoint
ReturnTo
Mains
ENABLED
DISABLED
CB Buttons not
active in TEST
- MGCB button: Gen-sets are synchronized to Mains via MGCB and MGCB closes. 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.
- MCB button: MCB is opened and MGCB is closed after FwRetBreak if there is enough running gen-
sets to support actual selected reserve for start.
Return to Mains after using buttons to initiate Test on Load function may be performed by changing or
forcing to ENABLED value to AMF settings:ReturnTo mains or by changing into different mode (e.g.
AUT mode). If the controller is switched to another mode, it behaves accordingly to that mode and the
current situation.
EXAMPLE:
Test on Load was performed by pushing MCB button. ProcessControl:Parallel enable = DISABLED
and ProcessControl:Synchro enable = NONE. Load is on gen-sets and the system is in Island
operation. Mode is changed to AUT. Controller counts down AMF settings:Mains ret del and if
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