IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
the MCB is not controlled).
Setpoint: Mains <V MP
This setpoint adjusts the threshold level for the mains undervoltage protection.
The threshold is adjusted in % of the nominal mains voltage, which is either
MainsNomV or MainsNomVph-ph, depending on the position of the setpoint
FixVoltProtSel.
The protection activates if the voltage in at least one phase drops under the
threshold for time longer than Mains V del.
NOTE:
The asociated protection to this setpoint is Mains protect type. This type of
protection is recorded into the history file, however it is not indicated in the Alarm
list. When a protection of Mains protect type occurs the controller opens either
MCB (in applications where the MCB is controlled) or GCB (in applications where
the MCB is not controlled).
Setpoint: Mains V del
The setpoint adjusts the delay for mains under- and overvoltage protections. The
thresholds for these protections are adjusted by setpoints Mains >V MP and
Mains <V MP.
NOTE:
Although the resolution of this setpoint is 0.01s, in fact the adjusted delay is
rounded to the next higher multiple of the period of the mains voltage. The period
is either 0.02s for 50Hz systems or 0.0166s for 60Hz systems. E.g. if the delay is
set to 0.03s at 50Hz system the real delay will be 0.04s.
Setpoint: Mains Avg>V MP
This setpoint defines the trip level for mains overvoltage protection based on 10-
minutes moving average of mains phase voltage. This protection is evaluated in
each phase and is activated immediately when the moving average value exceeds
limit adjusted by this setpoint.
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