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4.11.9 Speed Sensing.
The unit can obtain speed information from one of four sources.
•
Magnetic pickup unit
•
Battery charging flywheel magneto
•
Generator output 50/60Hz if used for genset control
•
Battery charging alternator
The unit requires the entry of a value into "Cal Value", which defines the number of pulses seen by the
speed input over 10 engine revolutions.
The actual speed input frequency, wherever it is derived from, may be displayed by setting the "Display Hz"
option in the Engine column to "On". This allows the set up engineer to read the sensed frequency and
derive the values required for the speed setting items below.
For example, assume the speed source is MPU and the engine runs at its normal speed of 1500 RPM,
The Hz display shows 1202 Hz.
Therefore the number of pulses per minute is 1202 X 60 = 72120.
The number of pulses per revolution is 72120/1500 = 48.08.
Therefore pulses per 10 revolutions are 480.
Note that the 0.08 can be ignored since this is probably due to the engine running very slightly faster than
1500 RPM.
Once the correct setting has been derived, the "Display Hz" item can either be set to "2P" for engines
rotating at 3000 RPM (at 50 Hz)and fitted with a 2 pole generator, or "4P" for engines fitted with a 4 pole
generator and operating at 1500 RPM (at 50 Hz) giving a frequency display. The item can also be turned off
if no display is required.
Low Water Level Icon
The low water level icon flashes red as a warning if the water level in the radiator is
low. The engine remains running. The icon is supplemented with an LCD message.
If the water level is very low the icon is lit and alarm LEDs flash. The engine is
shutdown. The icon and alarm are supplemented by an LCD message.
Low Fuel Level Icon
The low fuel level icon flashes red as a warning if the fuel level is low. The engine
remains running. The icon is supplemented with an LCD message.
If the fuel level is very low both the icon is lit and alarm LED flashes. The engine is
shutdown. The icon and alarm are supplemented by an LCD message.
High Canopy Temperature Icon
If there is an unacceptably high canopy temperature the engine will shutdown and the
icon is lit in conjunction with the general alarm LED. The alarm will be supplemented
by an LCD message.
If the canopy temperature sender goes open circuit, the icon flashes and the alarm
icon is lit. The icon and alarm are supplemented by an LCD message.
Belt Broken Icon
If the belt breaks the engine will shutdown and the icon is lit in conjunction with the
general alarm LED. The alarm will be supplemented by an LCD message.
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Troubleshooting
