Maintenance of Major Components
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5.1.2. Speed control unit for governor system
(DWC-2000 series speed control unit)
<Introduction>
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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.
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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.
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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 adjustments. 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 provide engine
shutdown.
<Description>
EC8OM007
CONTROL UNIT
-
+
Output
Circuit
Actuator
Battery
DROOP
SWITCH
Pulse/second = Hz
0.45 mm
MG
B
A
EF KL
D
C
PID
Controller
Droop Adjustment
Speed Adjustment
Stability Adjustment
Gain Adjustment
Starting Fuel
Adjustment
IDLE Speed
Adjustment
FV
Converter
Speed Ramp
Adjustment
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