(3) Governor Control Unit Adjustment
Before making an adjustment to the control unit
(Fig. 6),
make certain that linkage between actua-
tor lever
(3, Fig. 4)
and fuel control lever
(7, Fig. 4)
is properly adjusted. There must be no lost
motion or “play” in the linkage. Be sure magnetic pickup is producing a strong, normal output.
There are three adjustment controls on the unit
(see Fig. 6)
. They are identified as:
RATED SPEED - Adjusts engine speed and generator frequency.
GAIN and STABILITY - Together, these adjust engine response time and engine stability.
To adjust control unit, proceed as follows:
(a) If the control box is being adjusted for the first time, set adjustment control as follows:
RATED SPEED control - Set the rated speed control screw fully counterclockwise
(to mini-
mum speed setting).
GAIN control - Set this control screw to mid position.
STABILITY control - Set this control screw to mid position.
NOTE: A VERY shall screwdriver is required for these adjustments.
(b) Start engine and allow it to warm up.
(c) Place engine-generator control switch
(23, Fig. 1)
in GEN position to make electric governor
functional.
(d) Turn RATED SPEED adjusting screw clockwise to increase engine speed to 1714 RPM. At
1714 RPM, the frequency meter
(9, Fig. 1)
will indicate 400-Hz.
(e) Adjust GAIN control screw to the stable region between low frequency and high frequency os-
cillation.
(f) If there is a low frequency oscillation which does not stop when the gain control is adjusted,
turn the STABILITY control screw slightly clockwise and try the GAIN control adjustment again.
Continue adjusting the STABILITY control screw slightly clockwise, then re-adjusting the GAIN
control screw until the engine runs at a steady speed.
If there is a high frequency oscillation which does not stop, even when the GAIN control screw is
turned fully counterclockwise, adjust the STABILITY control screw slightly counterclockwise until
the high frequency oscillation stops.
(g) The electric governor is now set to a nominally good operating point. Trim adjustments as de-
sired or required.
2-3
March 16/90
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OM-2029
Summary of Contents for 140GT17K
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Page 128: ...Canopy Assembly Figure 2 OM 2029 4 3 September 30 89 Revised Page 4 ...
Page 130: ...Generator Set Without Canopy Figure 3 OM 2029 4 3 September 30 89 Revised Page 6 ...
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Page 134: ...Radiator and Cooling System Group Figure 4 OM 2029 4 3 September 30 89 Revised Page 10 ...
Page 136: ...Air Cleaner Assembly Figure 5 OM 2029 4 3 September 30 89 Revised Page 12 ...
Page 138: ...Electric Governor Kit Figure 6 OM 2029 4 3 September 30 89 Revised Page 14 ...
Page 140: ...Panel Engine Control Assembly Figure 7 OM 2029 4 3 September 30 89 Revised Page 16 ...
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Page 146: ...Stator Terminal Panel Assembly Figure 9 OM 2029 4 3 September 30 89 Revised Page 22 ...
Page 148: ...Power Module Panel Assembly Figure 10 OM 2029 4 3 September 30 89 Revised Page 24 ...
Page 150: ...Generator Group Figure 11 OM 2029 4 3 September 30 89 Revised Page 26 ...
Page 152: ...Fuel Line Assembly Figure 12 OM 2029 4 3 September 30 89 Revised Page 28 ...
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