Generac Power Systems 04390-1 - Manual (Page 15)

Generac ® Power Systems, Inc. 13
Section 2 — Post Installation Start-up and Adjustments
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators
5. Turn the speed adjust nut to obtain a frequency
reading of 63 Hz.
6. When frequency is correct at no load, check the
AC voltage reading. If voltage is incorrect, the volt-
age regulator may require adjustment.
Figure 2.3 — Engine Governor Adjustment
2.7.2 12 KW AND 15 KW UNITS
1. Loosen governor clamp bolt (See Figure 2.3).
2. Completely remove the idle spring.
3. With governor arm at wide open throttle position,
rotate governor shaft fully clockwise. Tighten
clamp bolt to 84 inch-pounds.
4. Start unit and apply full load. Use full load speed
adjust screw (Figure 2.4) to adjust frequency to
58 Hz.
5. Remove load, stop engine, loosen the idle adjust
screw and reconnect the idle spring.
Figure 2.4 — Full Load Speed Adjust Screw
6. Using a hand, push the governor arm to the
closed throttle position. Make sure the idle spring
does not stretch at all.
7. Restart the unit.
8. Slowly turn the idle adjust screw to adjust the no-
load idle frequency to 63-63.5 Hz (with door
open).
9. The governor is now set.
2.7.3 ADDITIONAL CORROSION
PROTECTION
Periodically spray all engine linkage parts and brack-
ets with corrosion inhibiting spray such as WD-40 or
a comparable product.
2.8 VOLTAGE REGULATOR
ADJUSTMENT
With the frequency between 62-63 Hertz, slowly turn
the slotted potentiometer (Figure 2.5) until line volt-
age reads 247-252 volts.
NOTE:
The access panel on top of the control panel must
be removed to adjust the voltage regulator.
Figure 2.5 – Voltage Adjustment Potentiometer
NOTE:
The voltage regulator is housed above the genera-
tor's control panel. The regulator maintains a volt-
age in direct proportion to frequency at a 2-to-1
ratio. For example, at 62 Hertz, line-to-neutral
voltage will be 124 volts.
◆
Full Load Speed Adjust Screw
◆
Governor Clamp Bolt
Governor
Shaft
(Rotate
Clockwise)
Idle Spring
No Load Idle
Adjustment Screw