Speed Control
The speed control box should be mounted on the control panel, often on the
same skid as the engine. It is not designed for installation on the engine. Provide
space for adjustment, wiring access, and ventilation. Choose a location that
protects the control from being bumped and that the wiring harness will reach.
The installation should allow for adequate air circulation to the control box and
have an ambient temperature of –40 to +75 °C (–40 to +167 °F).
Actuator
Install the actuator solidly, and install a linkage with the correct configuration to
provide an almost linear relationship between change of actuator position and
change in engine power output. In most cases use about 2/3 of the actuator
rotation between minimum and maximum fuel. The engine fuel control usually
provides the minimum and maximum stops. The minimum and maximum stops
on the actuator may be used, if necessary (see Figure 2-1). If the actuator is
controlling the speed-setting shaft of a mechanical governor, use the actuator
stops to limit the travel of the linkage. Set the minimum stop for 5% below rated
speed at no load, and set the maximum stop for rated speed plus 3% more than
the droop of the governor. The actuator is designed to operated in ambient
temperatures of –40 to +82 °C (–40 to +180 °F). Installation should avoid sources
of excessive heat.
Do not pressure wash sealed bearings—you may force dirt inside
them, shortening their life. If the actuator is exposed to weather,
mount it with the clockwise end higher, if possible.
Magnetic Pickup (MPU)
Install the magnetic pickup on a rigid bracket or housing so its tip is near an
engine-driven gear. This gear must be made of a ferrous material that reacts to a
magnetic field. Adjust the MPU for 0.25 to 1.0 mm (0.010 to 0.040 inch) between
the gear and the MPU at the closest point.
Electrical Connections
Connect the system as shown in the appropriate wiring diagram (Figures 1-2,
1-3, 1-4). See the appropriate manual for wiring of accessories. Connect the
speed control to system ground.
