CEC7 CONTROL UNIT ALARMS | PAGE 24
MINIMUM GENSET VOLTAGE
The CEC7 control unit's minimum genset voltage alarm is associated with the
condition that the measurement of the genset's RMS voltage is less than the
minimum voltage limit set (Thresholds table, parameter 3).
The phases which are evaluated for the detection of the minimum genset voltage
alarm are selected depending on the conguration of the installation phases
(Thresholds table, parameter 1):
• In a single phase con guration voltage V1N is tested.
• In a two-phase con guration voltage V12 is tested.
• In a three-phase con guration with neutral or three-phase without
neutral, phases V12, V23 and V13 are tested.
Detection of the genset minimum voltage alarm is set by default (Alarms table,
parameter 61) to be activated: From the nominal condition of the engine.A
minimum genset voltage alarm can be associated a debounce time (Alarms
table, parameter 62) during which the voltage between genset phases (VG12,
VG23 or VG31) must be kept below the minimum threshold limit set (Thresholds
table, parameter 3).
The minimum genset voltage alarm is set by default (Alarms table, parameter
105) to perform a stop of the engine with cooling.
MINIMUM GENSET FREQUENCY
The CEC7 control unit's minimum genset frequency alarm is associated with the
condition that the frequency generated by the genset is below the minimum
frequency limit set (Thresholds table, parameter 6). The measurement of genset
frequency is carried out on the rst phase. If in that phase no signal is detected,
the frequency measurement is then carried out on the second phase. Likewise, if
in that phase no signal is detected either, the frequency measurement is then
carried out on the third phase.
Detection of the genset's minimum frequency alarm is set by default (Alarms
table, parameter 64) to be activated: From the nominal condition of the engine.A
minimum genset frequency alarm can be associated a debounce time (Alarms
table, parameter 65) during which the frequency must be kept below the
maximum threshold limit set (Thresholds table, parameter 6).
The minimum genset frequency alarm is set by default (Alarms table, parameter
107) to perform a stop of the engine with cooling.
MAXIMUM GENSET FREQUENCY
The CEC7 control unit's maximum genset frequency alarm is associated with the
condition that the frequency generated by the genset is above the maximum
frequency limit set (Thresholds table, parameter 5).
The measurement of genset frequency is carried out on the rst phase. If in that
phase no signal is detected, the frequency measurement is then carried out on
the second phase. Likewise, if in that phase no signal is detected either, the
frequency measurement is then carried out on the third phase.
Detection of the genset maximum frequency alarm is set by default (Alarms
table, parameter 37) to be activated: From the nominal condition of the engine.
A maximum genset frequency alarm can be associated a debounce time (Alarms
table, parameter 38) during which the frequency must be kept above the
maximum threshold limit set (Thresholds table, parameter 5).
The maximum genset frequency alarm is set by default (Alarms table, parameter
108) to perform an immediate stop of the engine.
INCORRECT GENSET PHASES SEQUENCE
The CEC7 control unit's incorrect phase sequence alarm is associated with the
genset voltage input for each phase found in order.
The incorrect genset phases sequence alarm is only enabled when the control
unit is congured to work three-phase with neutral or three-phase without neutral.
Detection of the incorrect genset phase sequence alarm is set by default (Alarms
table, parameter 40) to be activated: From the nominal condition of the engine.
An incorrect genset phases sequence alarm can be associated a debounce time
(Alarms table, parameter 41) during which an incorrect order in the maximum
genset voltages must be detected.
The incorrect genset phases sequence alarm is set by default (Alarms table,
parameter 109) to always perform a stop of the engine with cooling.
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