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-8-624-344-23. MAXIMUM POWER TEST.a. General. The maximum power of a generator set is a function of the ambient conditions (temperature andaltitude) and the mechanical condition of the engine at any particular time.b. Apparatus. Instrumentation for measuring load conditions, field voltage and current, pressure andtemperatures shall be as described and illustrated in MIL-HDBK-705.CAUTIONThis procedure subjects the generator set to a severe overload which may bedamaging if maintained for too long a period of time. Failure to observe this cautioncould result in equipment damage.(1) Preparation for test.(a) Connect the load and instrumentation in accordance with the applicable figure of MIL-HDBK-705,Method 205.1, paragraph 205.1.10 for one voltage and frequency.(b) Install appropriate thermocouples to measure the following temperatures:1. Engine coolant (engine outlet and inlet)2. Exhaust gas(es) (the exhaust manifoldsshall be drilled and tapped as close aspossible to the combustion chamber(s).3. Lubricating oil sump.4. Engine combustion air in (located atthe inlet of the intake manifold).(c) Install appropriate pressure instrumentation to measure the following items:1. Exhaust pressure (combined exhaustgases in exhaust manifold).2. Intake air manifold pressure (betweenair filters and manifold).(d) Obtain and record the barometric and water vapor pressures (see MIL-HDBK-705,Method 220. 2).(e) Bypass the set circuit interrupter.(f) Connect the set to a source of fuel containing a specified fuel required by the procurementdocument.4-23
ARMY TM 9-6115-464-34AIR FORCE TO 35C2-3-445-2NAVY NAVFAC P-8-624-34(2) Test.(a) Start and operate the generator set and allow it to stabilize at rated load, rated voltage and ratedfrequency (speed). During this period, readings of all instruments including thermal instrumentationshall be recorded at minimum intervals of 10 minutes. If necessary, adjustments to the load, voltageand rated frequency. However, adjustments to the voltage and frequency shall be limited to thoseadjustments available to the operator, specifically adjustments to the voltage or frequency adjustdevices. On generator sets utilizing a droop-type speed control system as the prime speed control,the speed and droop portions of the control maybe adjusted. No other adjustments to the voltageand frequency control systems shall be made. Adjustments to the load, voltage or frequencycontrols shall be recorded on both the data sheet, and recording chart(s). Stabilization will beconsidered to have occurred when four consecutive voltage and current recordings of the exciterfield either remain unchanged or have only minor variations about an equilibrium condition with noevident continued increase or decrease in value after the last adjustment to the load, voltage orfrequency has been made.(b) Perform this test using resistive load only. Remove reactive load after stabilization.(c) For Class II Sets:1.Alternately increase the load, voltage and frequency in small increments until the fuel systemcontrols are in the maximum fuel position as permitted by the governor control linkage and thevoltage and frequency are within 1 percent of their rated values.NOTESmall increments should be taken to avoid passing the maximum power at the ratedvoltage and frequency point and to avoid racing or bogging the engine.2. Hold the conditions in step (1) above for two minutes. However, if the voltage and frequencycannot be maintained within 1 percent of their rated values, the load must be adjusted to thepoint at which the voltage and frequency can be maintained within 1 percent of the rated valuefor two minutes.CAUTIONIt may be necessary to reduce the load to a value below the rated kilowatt load for ashort period of time to prevent serious overheating or damage to the generator set ifthe conditions can not be readily attained. (Monitor instrumentation.) Failure toobserve this caution could result in equipment damage.3. At the end of the two minute interval record all instrument readings including thermalinstrumentation.4. Reduce the load to approximately rated kilowatt load and allow the generator set to cool forapproximately 5 to 10 minutes.5. Repeat steps (1) through (4) above until three valid sets of maximum power data are obtained.(d) For Class I Sets:1. Repeat step (c) above but do not adjust the frequency.2. Repeat steps (a) through (c) above as applicable for all other voltage connections andfrequencies.4-24
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ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

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