TEST OF PARALLEL CABLE ASSEMBLIES.

Figure 4-37. Main Disconnect Switch S120 Assembly

TM-9-6115-604-12 Generator Set Diesel Engine Driven Tactical Skid Rtd. 60 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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ARMY TM 9-6115-604-12 NAVY NAVFAC P-8-633-12 4-40. TEST OF PARALLEL CABLE ASSEMBLIES. The paralleling cable assemblies are used to interconnect generator sets via paralleling receptacles when isochronous paralleling is desired. These procedures apply for both the reactive load and governor control cables. See figure 3-9. a. Disconnect the parallel cable assemblies. b. Using a multimeter test each cable assembly as follows: (1) Check for isolation between adjacent conductors, and between any conductor and ground. There should be Infinite resistance for each test. (2) Check each conductor for continuity from one connector to the other. There should be zero resistance from one end of any conductor to the other. c. If tests fail to show isolation or continuity, refer to the next higher level of maintenance for repair and overhaul of the detective parallel cable assemblies. 4-41. TEST OF UTILITY POWER CABLE. Test utility power cable as follows: a. With multimeter set for resistive reading check each conductor A, B, and C, inside the cable for continuity between its terminal lug end and its plug connector terminal Meter reading should be zero ohms for each conductor. b. Using a 500 V dc megohmmeter, check resistance reading across cable conductors A, B, and C. Meter should register Infinite resistance. 4-42. MAINTENANCE OF MAGNETIC PICKUP PU1. The magnetic pickup PU1 (Figure 3-3) Ii an electromagnetic device that is mounted in the flywheel housing. As the flywheel gear teeth pass the magnetic pickup, ac voltage is induced, one cycle per tooth. This signal Is passed to the electronic speed control to provide an indication of the engine speed. a. Test. (1) Using a digital multimeter measure the voltage signal from the magnetic pickup PU1 (Figure 3-3) at the electronic speed control (refer to paragraph 4-51) across terminals C and D. With the engine at operational speed, the signal can range from 0.5 to 30 V rms. If the signal being generated is not within this range, attempt to adjust the magnetic pickup PU1 In accordance with step (2), below, to obtain the optimal signal of 30 V rms. If signal Is not present, or less than 0.3 V rms after best adjustment, replace the magnetic pickup PU1. CAUTION Do not attempt to adjust or replace the magnetic pickup PU1 with the engine (2) Raise the magnetic pickup voltage by reducing the gap between the pickup and the ring gear no closer than 0.030 inch (0.75 mm). This is equivalent to backing the pickup out by one-half turn after it touches the ring gear tooth on the flywheel b. Remove. See figure 3-3. (1) Disconnect plug from magnetic pickup PU1 (2) Loosen locknut, then unscrew and remove the magnetic pickup. c. Install. (1) With the engine stopped, screw the magnetic pickup PU1 (Figure 3-3) into the threaded recess until the tip touches the top of the ring gear tooth. Then back out the magnetic pickup PU1 one-half turn to three-quarters of a turn and secure with the locknut. (2) Reconnect plug on magnetic pickup PU1. (3) Test in accordance with step a, above. 4-103

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