Main Fuel Mixture
and
Droop
Adjustments:
1.
Connect rated load.
A.
Load (watts)
is
the product of volts (V) and
amps (A).
Load (watts)= V x A
B.
(A 1.0 power factor, obtainable with a re-
sistance load bank, is assumed. True
rated output might not be obtained if ap-
pliances are used as part of the load.)
C.
See Section
8.
Generator if output voltage
cannot be adjusted to within 10 percent of
rated voltage (Table
6-1
on Page 6-16).
2.
Turn the main fuel mixture adjusting screw
clockwise until the engine begins to stumble.
Then, counting the number of turns, turn the
screw counterclockwise until it begins to
stumble again. Set the screw halfway
in
be-
tween. For closer adjustments, use a CO meter
to adjust to 6-8% CO. See
Troubleshooting if
the engine runs roughly.
3.
Push the adjustment limite( cap on over the
mixture screw head such that the cap pointer
indicates the current altitude (gasoline carbu-
retors).
6-18
4.
Disconnect the load and readjust the governor
speed adjusting screw to return no-load fre-
quency to 62-63 Hz.
5.
Check and adjust droop.
A.
If droop (from no-load frequency) is more
than 3 Hz for Model BGM or 4 Hz for Model
NHD, turn the governor sensitivity adjust-
ing screw (Figure 6-13) one turn counter-
clockwise. Disconnect the load and, if nec-
essary, readjust the governor speed ad-
justing screw to return to 62-63Hz no-load
frequency. Check droop again and repeat
the adjustments, if necessary.
B.
If droop (from no-load frequency) is less
than
2Hz
for Model BGM or
3Hz
for Model
NHM, turn the governor sensitivity adjust-
ing screw (Figure 6-13) one turn clock-
wise. Disconnect the load and, if neces-
sary, readjust the governor speed adjust-
ing screw to return to 62-63Hz no-load fre-
quency. Check droop again and repeat the
adjustments, if necessary.
6.
Check governor response under 1/4, 1/2 and
3/4 rated loads. See
Troubleshooting if hunting
is unacceptable.
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