ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

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ARMY TM 9-6115-464-34AIR FORCE 35C2-3-445-2NAVY NAVFAC P-8-624-343-65. ELECTRIC GOVERNOR CONTROL UNIT (MEP-113A).a. General.(1) The electric governing system is a speed (frequency) sensing system used to maintain constantengine speed and generator output frequency during periods of unchanging load and when loadadditions or deletions occur. The system consists of a control unit, magnetic pickup and an electricthrottle actuating unit. The engine speed signal is obtained from a magnetic pickup mounted in theflywheel housing in close proximity to the flywheel ring gear. The frequency of the pickup signal isproportional to engine speed. Figure 3-85 shows the functional theory of operation.(2) The control unit has four distinct circuits: pickup signal amplifier, frequency reference oscillator,phase comparator and output circuit.(a)(b)(c)b. Malfunction.The frequency reference oscillator is voltage controlled. The frequency setting is adjusted byapplying zero to 10 volts at the frequency reference oscillator input. The internal frequency adjustprovides this voltage setting when the control unit is in operation. The reference oscillator does notmaintain a constant frequency. It deviates from its nominal frequency as the engine speed changesduring load changes. The reference oscillator is forced by the phase comparator to track theamplified pickup signal representing engine speed. The voltage representing speed error is theamount of voltage required to drive the reference oscillator off frequency in proportion to the enginespeed deviation.The phase comparator circuit receives signals from the pickup signal amplifier and the referencefrequency oscillator and compares the difference in frequency. The phase comparator measuresthe amount the engine signal is ahead or behind the reference oscillator signal. Its voltage output isused to force the reference oscillator to the same frequency as the signal from the engine. Thephase comparator output is proportional to the speed error. The gain control is used to couple thephase comparator output to the reference oscillator. By increasing the coupling, a small voltagechange from the phase comparator represents a large frequency change and vice-versa.The output circuit allows governing by introducing a temporary drop during a load change forstability purposes. It has an adjustable means to control the magnitude and time constant of thedrop to match the dynamic characteristics of the engine. The output current switching portion of thecircuit provides current to drive the actuator. The output transistor is switched on and off at afrequency of 200 Hz. This is above the natural frequency of the actuator. The actuator responds tothe average current from the transistor and moves in proportion to position the engine throttle. Theoutput transistor is switched on and off to reduce power dissipation.The following procedures are to be performed with the governor control unit in the generator set.(1) Connect the breakout cable (7, figure 3-86) as follows: Disconnect P17 (6) from J17(1), connectP17A(7) to J17(1), connect J17A(7) to P17(6).(2) Using a digital voltmeter, make the voltage readings in table 3-7 at the breakout cable plug. Allreadings are measured between the terminal and ground. Terminals F, G, H and T are ground.c. Removal.(1) Disconnect electrical connector P17 (1, figure 3-86).(2) Remove 4 hex head screws (2), Iockwashers (3) and nuts (4).(3) Remove the governor control unit (5).d. Installation(1) Position governor control unit (5, figure 3-86).3-186
ARMY TM 9-6115-464-34AIR FORCE TO 35C2-3-445-2NAVY NAVFAC P-8-624-34(2) Install nuts (4), Iockwashers (3), 4 hex head screws (2).(3) Connect electrical connector P17 (1).e. Adjustment Procedure(1)(2)(3)(4)Disconnect the actuator linkage rod from the engine fuel shutoff lever.Place the generator set START-RUN- STOP switch (located on the generator set control panel) inthe RUN position.Place the generator set BATTLE SHORT SWITCH (located on the generator set control panel) in theON (override) position.Beginning at the fully counterclockwise position, rotate the engine fuel shutoff lever in a clockwisedirection until a slight resistance is felt: hold the lever in this position.NOTEThis resistance is the fuel injection pump’s internal governor linkage hook engaging themetering valve arm.(5)(6)(7)(8)(9)(10)(11)(12)Move the actuator lever to the “full fuel” position. This is the direction against the spring resistance(fully counterclockwise).Measure the center to center distance between the hole in the fuel shutoff lever and the hole in theactuator lever. Adjust the rod ends on the threaded linkage rod so that the center to center distanceof the rod ends is the same or slightly longer than that measured between the fuel shutoff lever andthe actuator lever. (The 3.75 dimension is only approximate. If the linkage is too short, the actuatorlever will attain its “no fuel” position (full clockwise) before the fuel shutoff lever reaches its “no fuel”position; the fuel shutoff lever will never reach “no fuel”. If the linkage is too long, the actuator leverwill reach its “full fuel” (full counterclockwise) before the fuel shutoff lever reaches its "fuII fuel”position; full load will not be reached). It maybe necessary to readjust the position of the fuel shutofflever and/or the actuator lever to accommodate the center to center distance of the rod ends and toassure complete fuel shutoff and full load operation. Fuel shutoff and actuator lever adjustments arecovered under replacement procedures. Tighten the nuts on the linkage rod against the rod ends tomaintain proper spacing.Return the generator set START-RUN- STOP switch to the STOP position and the BATTLE SHORTswitch to the OFF position.Reconnect the actuator linkage rod end to the engine fuel shutoff lever.Adjust the control unit gain control to its approximate mid–range position.Adjust the control unit stability control to its fully counterclockwise position.Adjust the generator set frequency adjust potentiometer (pot) (located on the generator set controlpanel) to mid-range.Using a small screwdriver, slowly turn the control unit frequency adjust potentiometer (located on theleft side vertical face of the control unit) to the fully counterclockwise position (turn opposite increasearrow). This may require up to 22 turns. The generator set will now be operating at the lowestpossible engine governed speed.3-187
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Table 1-1. FITS AND TOLERANCES (CON
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(c)(d)(e)Pull all slack from the le
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ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

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