REFDESQUANTITYTEST EQUIPMENTDESCRIPTIONRd1RESISTOR, FIXED, 5000 OHMS, 1 WATTRf, Rg2RESISTOR] FIXED, B2 OHM, 10 WATTRh, Ri2RESISTOR FIXED, 15 OHMS, 5 WATTRj1RESISTOR, FIXED, 25 OHMS, 5 WATTM2, M32MILLIAMMETER, DC, 0-1000 MAM41MILLIAMMETER, DC, ZERO CENTER,10-0-10 MA1SWITCH, ROTARY, 3 POSITION, 1 POLE, 1 AMP1DC POWER SOURCE1AC POWER SOURCE1AUTOTRANSFORMER 2:1 RATIOME 6115-545-34/7-5Figure 7-5. Electric Governor Control Unit, Rectifier Bridge and Feedback Winding Test(50/60 Hz)(3) Once the set has been stabilized, connecta 0 - 10 volt range dc voltmeter (high impedancetype -2000 ohms per volt or more) across testpoints 3 and 4 with the positive lead at test point 4.Adjust FREQUENCY ADJUST control to obtain oper-ating frequency (400 W, or 60 Hz), and then adjustR14 until volt e across test points 3 and 4 is zerovolts, with no load on generator.(4) Connect dc voltmeter across tests points 1and 2 with positive lead at test point 1. Adjust R11and the frequency adjust control until the dc volt-meter reads zero volts at nominal frequency. Repeatthe adjustment until the voltage across test points 3and 4 and across 1 and 2 is zero volts, and the setfrequency is 50 Hz, 60 Hz or 400 Hz with no loadon the engine. If test points 1 and 2 cannot bezeroed, they must be reduced to a minimum.(5) Adjust RI 2 until a reading of approximately4.5 volts is obtained across test points A and B, withno load on generator.If this voltage is too low,response will be sluggish and if it is too high, a rapidoscillation may occur.Normal range is 3 to 6 volts.(6) Adjust R18 clockwise as far as possible,and R16 counterclockwise as far as possible withoutcausing oscillation,NOTEIncreasing the load measurement gainR15 (turing in a clockwise direction)will improve transient performance;therefore it should be adjusted as highas possible. Transient performance mustbe checked using a frequency recorder.7-8 Change 1
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
