CEC7 CONTROL UNIT ALARMS | PAGE 26
INCORRECT NETWORK PHASES SEQUENCE
The CEC7 control unit's incorrect network phases sequence alarm is associated
with the fact that the maximums of the network signal phases are in order (phase
1, phase 2 and phase 3 in that order respectively). The incorrect network phases
sequence alarm is only managed when the control unit is congured to work
three-phase with neutral or three-phase without neutral.
The detection of the incorrect network phases sequence alarm can be congured
(Alarms table, parameter 96) as follows:
• 0: Not checked.
• 1: Checked and if an error is detected the engine is started.
An incorrect network phases sequence alarm can be associated a debounce
time (Alarms table, parameter 97) during which an incorrect order in the maximum
network voltages must be detected.
The detection of the incorrect network phases sequence alarm is a genset
starting condition.
NETWORK SIGNAL FAILURE
The CEC7 control unit's network signal failure alarm is generated if network
voltage is not detected in any phase.
The detection of the network signal failure alarm can be congured (Alarms table,
parameter 98) as follows:
• 0: Not checked.
• 1: Checked and if an error is detected the engine is started.
A network signal failure alarm can be associated a debounce time (Alarms table,
parameter 99) during which no network signal must be detected during any
phase before activating the alarm.
The detection of the network signal failure alarm is a genset starting condition.
MAXIMUM NETWORK FREQUENCY
The CEC7 control unit's maximum network frequency alarm is associated with
the condition that the frequency generated by the network is above the maximum
frequency limit set (Thresholds table, parameter 15).
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.
The detection of the maximum network frequency alarm can be congured
(Alarms table, parameter 92) as follows:
• 0: Not checked.
• 1: Checked and if an error is detected the engine is started.
A maximum network frequency alarm can be associated a debounce time (Alarms
table, parameter 93) during which the network signal frequency must be kept
above the maximum threshold limit set (Thresholds table, parameter 15). The
detection of the maximum network voltage alarm is a control unit starting
condition.
MINIMUM NETWORK FREQUENCY
The CEC7 control unit's minimum network frequency alarm is associated with the
condition that the frequency generated by the network is below the minimum
frequency limit set (Thresholds table, parameter 16).
The measurement of genset frequency is carried out on the rst phase. If in that
phase no electric signal is detected, the frequency measurement is then carried out
on the second phase. Likewise, if in that phase no electric signal is detected either,
the frequency measurement is then carried out on the third phase. The detection of
the minimum network frequency alarm can be congured (Alarms table, parameter
94) as follows:
• 0: Not checked.
• 1: Checked and if an error is detected the engine is started.
A minimum network frequency alarm can be associated a debounce time (Alarms
table, parameter 95) during which the network signal frequency must be kept
below the minimum threshold limit set (Thresholds table, parameter 16). The
detection of the minimum network voltage alarm is a control unit starting
condition.
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