Generac Power Systems IM Series - Manual (Page 26)

ADJUSTMENTS
General
This section is inciuded with other a-c generator informa­
tion, because the covered information is so important to
proper generator operation and correct a-c output. The
engine governor adjustment may belong in the ENGINE
SERVICE MANUAL. However, that adjustment is so
important to correct a-c output frequency and voltage that
it is included here.
Adjustments included in this section include thefollowing:
1. Engine governor adjustment.
2. Voltage Regulator adjustment
3. Automatic Choke adjustment.
NOTE: An optional LP gas (propane) fuel system Is
available for use with the NP series generators.
Instructions for the installation and adjustment of
the LP gas conversion kit are Included with the kit.
Engine Governor Adjustment
A
Also see ROTOR ROTATIONAL SPEED on Page 4
of this Manual. The engine governor is generally ad­
justed to deliver a generator a-c output frequency of
61-62 Hz, with no electricai loads connected to the gen­
erator. Following the no-load adjustment of engine
speed, unit operation shouid be checked with a ioad
applied. Adjust the engine governor as foiiows:
1. Visually inspect ANTI-LASH SPRING, make sure it is
not broken or disengaged. Spring ends must be hooked
into GOVERNOR LEVER at bottom end and into car­
buretor THROTTLE LEVER at top.
2. Loosen GOVERNOR CLAMP NUT.
3. Push spring end of GOVERNOR LEVER ail the way
up, to wide open throttle position. While holding the
LEVER down, insert a screwdriver into siotted end of
GOVERNOR
SHAFT and rotate SHAFT fuliy
counterclockwise. Then, tighten the GOVERNOR
CLAMP NUT to 100 inch-pounds of torque.
CAUTION!: Governor shaft MUST be rotated fully
counterclockwise with throttle wide open or full
governor travel will not be reached. Governor clamp
nut must be tight Or full governor travel may be lost
due to vibration.__________________________________
4. Connect an accurate a-c frequency meter and
voltmeter across generator a-c output leads T2 (white)
and T3 (black) for Series NP45G/NP55G; or across ieads
T1 (red) and T2 (white) for Series NP65G. See Step 3
under Probiem No. 6 on Page 19. (Check A-C VOLTAGE
AND FREQUENCY).
5. Start the engine. Let it stabilize and warm up for a few
minutes with NO ELECTRiCAL LOADS APPLiED TO
GENERATOR.
6. Check a-c frequency; it should be 61 -63 Hz. If not, turn
ADJUSTER NUT until frequency is correct.
7. With governed speed at 61-63 Hz (no-load), check
voltage reading. Voltage should be 122-126 volts. If not,
adjustment of the Voltage Regulator is required.
Voltage Regulator Adjustment
CAUTION: DO NOT adjust the Voltage Regulator
until a-c output frequency Is correct. See ENGINE
GOVERNOR ADJUSTMENT.
B
Check that a-c frequency is correct, as outiined in
ENGiNE GOVERNOR ADJUSTMENT. If frequency Is
within stated limit (61-63 Hz), a-c voltage output should
be 122-126 volts. If voltage is not correct, adjust the
Voitage Regulator by turning the VOLTAGE ADJUST
potentiometer slowly until a-c voltage Is within the stated
limits. Voltage regulator is mounted in the generator
24