191Section 10 Governor AdjustmentsTP-6356 4/12
10.2 Electronic Governor
10.2.1 A-246045
Some generator sets are equipped with Barber-Colman
Dyna 2500 electronic governors. This is an electronic
device requiring no mechanical drive or hydraulic
connection. The system consists of a magnetic pickup,
an electronic control unit, and an actuator. The
magnetic pickup monitors engine speed and transmits
this information to the electronic control unit. See
Figure 10-3. The electronic control unit interprets the
signal from the magnetic pickup to control current input
to the throttle actuator. The throttle actuator adjusts the
throttle position on the engine. See Figure 10-4. Adjust
the actuator shaft linkage for smooth, nonbinding
operation and to hold the carburetor throttle lever in the
closed position when the power is off. The magnetic
pickup air gap is 0.36--0.71 mm (0.014--0.028 in.).
See Section 10.4 for the magnetic pickup adjustment.
RED
BLACK
PURPLE
PURPLE
ACT
MPU
WHITE
BLK/WHT
GAIN
SPEED
TP-5353-7
+
--
+
--
1
2
3
4
1. Control unit
2. Magnetic pickup
3. Actuator
4. 12-volt battery
Figure 10-3 Governor Control Unit
TP-5353-7
1
2
1. Actuator 2. Linkage
Figure 10-4 Throttle Actuator, Typical
Preliminary Adjustments
1. Place generator set master switch to the OFF
position. The generator set must not be running.
2. Set the gain adjustment three divisions from zero.
Final Adjustments
1. Place generator set master switch to RUN to start
generator set.
2. Adjust the control unit speed potentiometer until
the engine is operating at the desired rpm (50 or
60 Hz on the frequency meter).
3. If governing is unstable, turn gain potentiometer
slightly counterclockwise (CCW).
Note: Gain potentiometer has internal stops at 0%
and 100%.
4. With the engine running at no load, finalize gain
adjustment. Turn the gain adjustment clockwise
(CW) until the output shaft and linkage is stable.
Upset the linkage by hand. If the linkage oscillates
3--5 times then stops, the setting is correct.
5. Place the generator set master switch to the OFF
position to stop the generator set.
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