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-8-624-34e. Results.(1) From the oscillograms made in 4-20c, determine and tabulate the time between the application ofthe overvoltage and operation of the circuit interrupter for each application of overvoltage.(2) From the oscillograms made in 4-20d. determine and tabulate the time between the application ofthe undervoltage and the operation of the circuit interrupter for each application of undervoltage.(3) Compare these results with the requirements of table 4-1.4-20. LOW OIL PRESSURE PROTECTIVE DEVICE TEST.a. General. Since generator sets frequently operate unattended for tong periods, the engine is equipped witha low oil pressure protective device. This device shuts down the engine when the oil pressure drops below thesafe limit.b. Apparatus. The following equipment shall be required to perform this test.Oil pressure gauge (±1%)Flexible oil line (or copper tubing)Regulating valvesBrass fittings.c. Procedure.(1) Preparation for test. With the set not operating, remove the protective device tap from the engineblock and reconnect as shown in figure 515.1–I with the protective device and oil pressure gauge inapproximately the same horizontal plane as the protective device tap located on the engine.(2) Test.(a) With the bleeder valve closed and the shut-off valve in the oil pressure line open, start and operatethe set at rated speed (use the set instrumentation) and at no load.(b) Open the bleeder valve slightly to purge air from the system.(c) Close the bleeder valve and record the oil pressure as indicated on the external gauge.(d) Almost completely close the shut-off valve.(e) Slowly open the bleeder valve until the low oil pressure protective device shuts down the engine.Record the reading of the oil pressure gauge at the point of set shutdown (see figure 515.1-II).(f) Record operation of the malfunction indicator light.d. Results. Compare the value of shutdown pressure with the requirement of table 4-1.4-21. OVERTEMPERATURE PROTECTIVE DEVICE TESTa. General. The overtemperature device must be capable of protecting the engine in the set againstoverheating for any reason.b. Apparatus Instrumentation for measuring load conditions and set and ambient temperatures shall be asdescribed and illustrated in MIL-HDBK-705, Method 205.1, Paragraph 205.1.10.4-21
ARMY TM 9-6115-464-34AIR FORCE TO 35C2-3-445-2NAVY NAVFAC P-8-624-34c. Procedure.(1) Preparation for test.(a) Connect the load instrumentation in accordance with the applicable figure of MIL-HDBK-705,Method 205.1, Paragraph 205.1.10.(b) Install a thermocouple to measure the same temperature as seen by the protective device sensor.(2) Test.(a) Start ando perate the generator set at rated voitage, rated frequency (speed), and rated load.(b) Block the cooling air to the generator set by any suitable means.(c) Continuously monitor the temperature seen by the thermocouple installed in paragraph 4-22c. (1)(b) above. Record the temperature at which the overtemperature protective device actuates.Record the temperature at which the coolant temperature indicator illuminates.CAUTIONIf the engine fails to shutdown when the temperature exceeds the maximum trip valuespecified in table 4-1, the test shall be immediately discontinued. Failure to observethis caution could result in equipment damage.d. Results. Compare the results with the requirement of table 4-1.4-22. PHASE SEQUENCE TEST (ROTATION)a. General. Unless the phase sequence (rotation) of the load terminals of a three-phase generator set iscorrect, serious damage or injury could be done to connected equipment and to personnel as a result ofreversed motor rotation or excessive current surges.b. Apparatus. A phase sequence (rotation) indicator as described and illustrated in MIL-HDBK-705, Method116.1 or a three–phase motor whose direction of operation in relation to phase sequence is known shall berequired.c. Procedure.(1) Connect the generator set load terminals to the applicable test apparatus for one of the setthree–phase voltage connections. Recheck the connections to insure that L1, L2 and L3 of thegenerator set are connected to L1, L2 and L3 of the test apparatus respectively.(2) Start and operate the generator set at rated voltage and frequency. The set indicating instrumentsshall be sufficient indication of output voltage and frequency.(3) Close the circuit interrupter and determine the direction of phase sequence (rotation) by observingthe indicator, or by noting the direction of rotation if a three-phase motor is used. Record results.(4) Check the phase sequence (rotation) of the power output of each power receptacle on the generatorset by connecting the applicable test apparatus to the receptacle and repeating steps (1) thru (3)above.(5) Repeat steps (a) thru (d) above for all other three-phase voltage output connections of the generatorset.d. Results. The phase sequence (rotation) as indicated by the test shall be checked against therequirements of table 4-1.4-22
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ARMY *TM 9-6115-464-34 AIR FORCE TO-35C2-3 ... - Igor Chudov

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