Maintenance of Major Components
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Accessory input
The Auxiliary Terminal N accepts input signals from load sharing units, auto synchronizers, and
other governor system accessories, DWC accessories are directly connected to this terminal. It is
recommended that this connection from accessories be shielded as it is a sensitive input terminal.
If the auto synchronizer is used alone, not in conjunction with a load sharing module, a 3M ohm
resistor should be connected between Terminals N and P. This is required to match the voltage
levels between the speed control unit and the synchronizer.
When an accessory is connected to Terminal N, the speed will decrease and the speed adjustment
must be reset.
When operating in the upper end of the control unit frequency range, a jumperwire or frequency trim
control may be required between Terminals G and J. This increases the frequency range of the
speed control to over 7,000 Hz.
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Accessory supply
The +10 volt regulated supply, Terminal P, can be utilized to provide power to DWC- 2000 governor
system accessories. Up to 20ma of current can be drawn from this supply. Ground reference is
Terminal G. Caution : a short circuit on this terminal can damage the speed control unit.
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Wide range remote variable speed operation
Simple and effective remote variable speed can be obtained with the DWC-2000 Series control unit.
A single remote speed adjustment potentiometer can be used to adjust the engine speed
continuously over specific speed range. Select the desired speed range and the corresponding
potentiometer value.(Refer to table) If the exact range cannot be found, select the next higher range
potentiometer. An additional fixed resistor may be placed across the potentiometer to obtain the
exact desired range. Connect the speed range potentiometer as shown.
To maintain engine stability at the minimum speed setting, a small amount of droop can be added
using the DROOP adjustment. At the maximum speed setting the governor performance will be near
isochronous, regardless of the droop adjustment setting.
<Variable speed range potentiometer value>
Speed range Potentiometer value
900 Hz 1 k
2,400 Hz 5 k
3,000 Hz 10 k
3,500 Hz 25 k
3,700 Hz 50 k
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