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Alternator excitation may also be used as a secondary crank disconnect signal for the case where the
speed signal has failed immediately the engine starts to run. This feature can be disabled if not required
by setting “Excite Dis” to No.
For systems where a battery-charging alternator is not fitted turning off the excitation warning can disable
the excitation system.
Battery Voltage Monitoring and Charging Detection
A battery is considered charged if (assuming a 12V system.x 2 for 24V) its terminal voltage is above
13.1Volts. Typically a fully charged battery has a terminal voltage of 13.6V. Above this and the battery is
being overcharged. During cranking the large discharge current will reduce the battery terminal voltage
below 12.5V. The battery cannot increase the terminal voltage again without the assistance of a charger.
This sequence provides a useful mechanism to determine if a battery is being actively charged.
Many applications have a current meter to show charging current. Such meters provide very limited value
as a good battery will recover its terminal voltage very quickly and then be maintained with a very low level
of trickle current. This trickle current is usually too small a percentage of the current meters range to
provide any useful information.
The unit constantly measures the battery terminal voltage and can detect proper charging and discharging
performance. Voltage readings are taken and compared against an inbuilt voltage profile. If the battery
terminal voltage falls outside the critical voltages for each action then a battery warning is indicated.
During standby, and particularly where an on line charger is not available, monitoring the health of the
battery is vital. The unit regularly wakes and measures the battery voltage, If it falls below the set point it
gives a warning to ensure the operator is aware of the need for battery recharging.
4.11.11 Trouble shooting
The unit displays the following messages when an alarm occurs. Alarms shut down the engine, set the
alarm output and flash the alarm indicator. The alarm indications are cleared when the stop button is
pressed after the engine has stopped.
Message Cause
Low Oil Pressure Oil pressure has not reached the Oil Alarm set point (Oil Alarm) at the
end of the run up time or has dropped below this value when the engine
is running. The Oil Icon turns on
Low Fuel Level Fuel level is less than the minimum value set point.
High Engine Temp Engine temperature has exceeded the high temperature set point. The
temperature icon turns on. This message may also be shown as “High
Water Temperature” depending on temperature system setup.
Low Water Level Water Level is below the water level very low level.
Under speed Engine speed has dropped below the under speed set point. The speed
icon is lit.
Over speed Engine speed has exceeded over speed set point. The speed icon is lit.
High Rev Engine has exceeded safe operating speed. The speed icon is lit.
No Speed Signal Engine has lost speed signals while running
Start Failure The engine has failed to start
Stop Failure The engine has failed to stop
E-S Lock out The emergency stop input has stopped the engine
Trip Alarm The external delayed trip input has stopped the engine
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