Doosan P158LE -III, Operation & Maintenance Manual

Page: 113 / 165

Maintenance of Major Components - 110 -
5.1.5. Application and installation information
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The speed control unit is rugged enough for mounting in a control cabinet or engine mounted
enclosure or in a remote console up to 20 meters(65 ft.) from the engine. Care should be taken to
insure that the speed control unit, mount it vertically so that condensation will not accumulate in the
speed control unit.
WARNING :
An overspeed shutdown device, independent of the governor system, should be
provided to prevent loss of engine control which may cause personal injury or
equipment damage. Do not rely exclusively on the governor system electric actuator
to prevent over speed. A Secondary shutoff device, such as a fuel solenoid must be
used.
5.1.6. Wiring
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Wiring to the speed control unit should be as shown in Diagram 1. Wire leads to the battery and
actuator from the speed control unit terminals A, B, E and F should be #16 AWG(1.3 mm sq.) or
larger. Long cables require an increased wire size to minimize voltage drops. An external 15 amp
fuse is recommended in series with terminal F, the positive (+) battery input terminal.
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The magnetic speed sensor leads must be twisted and/or shielded for their entire length. If shielded
cables are used, connect all the shields to terminal D only. The shield should be insulated to insure
no other part of the shield comes in contact with engine ground, otherwise stray speed signals may
be introduced to the speed control unit. With the engine stopped, adjust the gap between the
magnetic speed sensor and the ring gear teeth. The gap should not be any smaller than 0.020 in
(0.45 mm). Usually, gear tooth will achieve a satisfactory air gap. The magnetic speed sensor
voltage should be at least 1 VAC RMS during cranking.
5.1.7. Adjustments
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Before starting engine
Confirm the following adjustment positions. The adjustments are factory pre-set as follows :
Check to insure the GAIN and STABILITY adjustments, and if applied, the external SPEED TRIM
CONTROL are set to mid position.
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Preset the DWC-2000 as follows :
Gain............................................................................................................................. Minimum CCW
Stability................................................................................................................................ Mid-range
Speed adjust ........................................................................................................................ 3,650 Hz
Idle ........................................................................................................................................1,950 Hz
Droop ........................................................................................... Maximum CCW (Minimum setting)
Over speed .................................................................................................................. Maximum CW
Run ramp ..................................................................................................................... Maximum CW
Crank ramp .................................................................................................................. Maximum CW
Starting fuel .................................................................................................. Full CW (Maximum fuel)
Speed ramping .................................................................................................... Full CCW (Fastest )