2) Speed control unit for governor system
(DWC-2000 SERIES SPEED CONTROL UNIT)
<Introduction>
This speed control unit performs the electronic function of the engine governing system. The speed
control unit senses the pulses from the magnetic speed sensor, compares them with the speed
control unit's set point and supplies the appropriate current output to the actuator to control the
engine's fuel system.
An integral, independent single element speed switch is provided internally which can be used to
initiate engine shutdown in the event that an overspeed condition is reached. The performance of
the speed control unit is fast and responsive in either isochronous or droop operation.
Adjustments are provided for: operating speed, idle speed, overspeed shutdown setting, droop,
run ramp, crank ramp, starting fuel, speed ramping and two performance adjustments(gain and
stability). All adjustments are accessible from the front cover. The primary features of the DWC-
2000 Series speed control unit are the engine STARTING FUEL and SPEED RAMPING adjust-
ments. The use of these features will minimize engine exhaust smoke experienced prior to attain
engine operating speed. The speed control unit also includes other features such as adjustable
droop and idle operation, inputs for accessories used in multi-engine or special applications and
protection against reverse voltage polarity, transient voltages and accidental short circuit of the
actuator. Loss of battery supply, loss of speed sensor and overspeed signaling are built-in to pro-
vide engine shutdown.
<Description>
- 139 -
To Next Page
Loading...
