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Sr.
No.
Alarms Causes
Voltage the pre-set over voltage threshold
15
R/L1 Phase Under
Voltage
Indicates that genset L1(R) Phase voltage has fallen
below pre-set under voltage threshold.
16
Y/L2 Phase Under
Voltage
Indicates that genset L2(Y) Phase voltage has fallen
below pre-set under voltage threshold
17
B / L3 Phase Under
Voltage
Indicates that genset L3(B) Phase voltage has fallen
below pre-set under voltage threshold
18
Genset Phase
Reversal
Alternator phase sequence is not correct
19
Over Frequency
Indicates that genset output frequency has exceeded the
pre-set threshold
20
Under Frequency
Indicates that genset output frequency has fallen below
the pre-set threshold
21
Over Current
Indicates that genset current has exceeded the pre-set
shutdown threshold
22
Over Load
Indicates that the measured kW load rating has exceeded
the pre-set threshold
23 Unbalanced Load
Load on any phase is greater or less than other phases by
a threshold value
24
Over Speed
Indicates that genset speed has exceeded the pre-set
over speed threshold
25
Gross over speed
Indicates that genset speed has exceeded the pre-set
gross over speed threshold
26
Under Speed The engine speed has fallen below the pre-set RPM
27
Extended Over Load
Trip
Indicates that there was 100% load on the genset for one
hour in the time interval of last 12 hours
28
Battery Under Voltage The battery voltage has fallen below the pre-set threshold
29
Battery Over Voltage The battery voltage has exceeded the pre-set threshold
30
Maintenance Due
Indicates that engine running hours has exceeded the pre-
set hours limit or maintenance due date has occurred, and
filter servicing is required.
31
Mains Phase Reversal Indicates the Mains unhealthy condition
32
AVR Fault Generic fault
33
No speed signal
If signal is not received when MPU speed signal source is
selected in engine running condition.
34
Speed Sensor I/P Lost
If engine speed sensing through sensor is enabled and
GCU is not getting any signal from speed sensor.
35
High Voltage Failure
If the voltage generated during the auto-exercise is too
high
36
Low Voltage Warning
If the voltage generated during the auto-exercise is too
low
37
Alternator Input Lost If the alternator signal is lost
38
Low Voltage Failure
If the voltage generated during the auto-exercise is too
low
39
Auto Exercise Skipped
If ambient temperature is less than 40°F and auto
exercises time occurs, GCU skips exercise and gives this
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