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

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ARMY TM 9-6115-464-34AIR FORCE TO 35C2-445-2NAVY NAVFAC P-8-624-34(b) Convert each of the values obtained in (a) above to a percentage of rated voltage by dividing bythe rated voltage and multiplying by 100. This is the voltage regulation expressed in percent.(c) Repeat paragraph 4-15d. (1) above substituting frequency for voltage.(d) Compare the results tabulated in paragraphs 4-15d. (1) and 4-15d. (6) (c) with the requirements ofTable 4-1.4-15. FREQUENCY ADJUST RANGE TESTa. General. It is necessary that the frequency of a generator set be adjustable to provide rated frequency atvarious load conditions as required in certain applications and to synchronize two or more generator sets forparallel operation.b. Apparatus. Instrumentation for measuring load conditions, field voltage and current, and ambienttemperature shall be as described and illustrated in MIL–HDBK-705.c. Procedure.(1) Preparation for Test. Connect the load and field instrumentation in accordance with the applicablefigure of MIL–HDBK–705, method 205.1, paragraph 205.1.10.(2) Test.(a) Start and operate the generator set and allow it to stabilize at rated load, rated voltage and ratedfrequency.During this period, readings of the load and field instrumentation shall be recorded at minimumintervals of 10 minutes. If necessary, adjustments to the load, voltage and frequency may be madeto maintain rated load at rated voltage and rated frequency. However, adjustments available to theoperator, specifically adjustments to voltage and frequency adjust devices. Adjustments to the load,voltage or frequency shall be noted on the stabilization data sheet. Stabilization will be consideredto have occurred when four consecutive voltage and current readings of the exciter field eitherremain unchanged or have only minor variations about an equilibrium condition with no evidentcontinued increase or decrease in value after the last load, voltage or frequency adjustment hasbeen made.(b) No further adjustments shall be made to any set control for the remainder of this test except for thecontrol panel frequency adjust device.(c) For each of the conditions in the following steps allow approximately 2 minutes between eachadjustment and the subsequent instrument readings.(d) Adjust the generator set frequency for the specifiedrecord all instrument readings.(e) Adjust the generator set frequency for the specifiedrecord all instrument readings.maximum frequency at rated load. Read andminimum frequency at rated load. Read and(f) Reduce the load to zero.(9) Adjust the generator set frequency for the maximum attainable frequency. Read and record allinstrument readings. If the over frequency or overspeed protection device actuates, read andrecord all instrument readings just prior to the point of actuation and note on the data sheet that theprotection device actuated.4-15
ARMY TM 9-6115-464-34AIR FORCE TO 35C2-3-445-2NAVY NAVFAC P-8-624-34NOTEThis step is not applicable to generator sets having governors that utilize a threadedshaft and lock nut(s) or other mechanical means as a method of operator speedadjustment.(h)Adjust the generator set frequency for the minimum attainable frequency. Read and record allinstrument readings.(i)NOTEThis step is not applicable to generator sets having governors that utilize a threadedshaft and lock (nuts) or other operator speed alignment.Repeat 4-16c (1) and 4-16c. (2) (a) through (f) for each frequency.d. Results. The data sheet shall show the maximum and minimum frequencies attained at rated 109d, themaximum and minimum attainable frequencies at no load and actuation of the protection devices (if applicable).Compare these results with the requirements of table 4-1.4-16. OVERSPEED PROTECTIVE DEVICE TESTa. General. To assure that adequate protection is afforded the generator set against overspeeding, theoverspeed protective device must operate properly.b. Apparatus. A frequency meter or tachometer as described and illustrated in MIL-HDBK–705, Methods104.1 or 109.1 shall be required.c. Procedure.(1) Preparation for Test. Connect the frequency meter in accordance with the applicable figure ofMIL-HDBK-705, Method 205.1, Paragraph 205.1.9 or utilize the tachometer in accordance with themanufacturer’s instructions. Electronic governor and throttle stops must be deactivated.(2) Test.(a) Start and operate the generator set at rated speed (frequency), rated voltage and no load.(b) Slowly increase the engine speed until the overspeed protective device actuates. Record the speedof the generator set at this point, and the malfunction indicator light indication.CAUTIONDo not operate the set in excess of 125 percent of rated speed or as otherwise limitedin the procurement document. Failure to observe this caution could result in damage tothe equipment.(c) Attempt to start the set. Record if starting is achieved. If the set did not start, reset the overspeedprotective device.(d) Compare the test results with requirement of table 4-1.4-16
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ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

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