16
2.5 ENGINE GOVERNOR ADJUSTMENT
If both AC frequency and voltage are correspondingly high or low,
adjust the engine governor as follows:
2.5.1 8 KW UNITS
The engine must be OFF to perform steps 1 and
2.
1. Loosen the governor clamp bolt (Figure 2.1).
2. Hold the governor lever at its wide open throttle position
(clockwise), and rotate the governor shaft clockwise as far
as it will go. Then, tighten the governor lever clamp bolt to 70
inch-pounds (8 N-m).
3. Start the generator; let it stabilize and warm up at no-load.
4. Connect a frequency meter across the generators AC output
leads.
Figure 2.1 — Engine Governor Adjustment
Single Cylinder Engines
GOVERNOR
SHAFT
PRIMARY
ADJUST
SCREW
GOVERNOR
CLAMP
BOLT
SECONDARY
ADJUST SCREW
5. Turn the primary adjust screw to obtain a frequency reading
of 61.5 Hertz. Turn the secondary adjust screw to obtain a
frequency of 62.5 Hz.
2.5.2 10, 14, 17 & 20KW UNITS
NOTE:
All V-twin units DO NOT require an engine governor
adjustment due to their design.
2.5.3
ADDITIONAL
CORROSION
PROTECTION
Periodically spray all engine linkage parts and brackets with corro-
sion inhibiting spray such as WD-40 or a comparable product.
2.6
VOLTAGE
REGULATOR
ADJUSTMENT
2.6.1 8 & 10KW UNITS
Due to the brushless design of these two alternators, no voltage
regulator is used and therefore no voltage adjustment is required.
2.6.2
14, 17 & 20KW UNITS
With the frequency between 59.5 -60.5 Hertz at no-load, slowly
turn the slotted potentiometer (Figure 2.2) until line voltage reads
247-249 volts.
Figure 2.2 – Voltage Adjustment Potentiometer
Turn to
adjust voltage.
NOTE:
The access panel on top of the control panel must be
removed to adjust the voltage regulator.
NOTE:
The voltage regulator is housed behind the genera-
tor's control panel. The regulator maintains a voltage
in direct proportion to frequency at a 2-to-1 ratio. For
example, at 60 Hertz, line-to-neutral voltage will be
124 volts.
Section 2 — Post Installation Start-up and Adjustments
Air-cooled Generators