Figure 13-2. Speed Switch Sensitivity Tests (Mechanical Type Switch) (Code A")

Figure 13-1. Speed Switch,-Exploded View (Mechanical Type Switch) (Code "A")

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 drive speed gradually and observe that the contacts close in the 290 to 310 range. (5) Connect ohmmeter leads across pins D and E and verify an open circuit. Increase drive speed and observe that elements S9-2 (contacts D and E) closes in the speed range of 590 to 610 rpm. Gradually reduce speed to 490 minimum rpm. Observe that element S9-2 resets to the condition shown in figure 13-2. (6) Connect ohmmeter across pins H and G connector and verify a closed circuit. Increase drive speed gradually. The contacts should open at a speed of 1100 to 1150 rpm. Hold drive speed and read contacts F and J. Meter should indicate a closed circuit. Reduce drive speed to less than 1000 rpm, press the manual reset switch and observe with the meter that element S9-3 contacts reset to the condition shown in figure 13-2. (7) To obtain the required performance characteristics during tests (3) through (6), adjustments can be made. By loosening screws (1, figure 13-1) and rotating the cap and cover assembly relative to the body assembly, the trip points of all those elements can be raised or lowered. In addition, the trip speed of each individual element can be raised or lowered by removing cover screws as shown in figure 13-2 and turning appropriate set screw located beneath cover screws with a 1/16 inch Allen wrench. Figure 13-2. Speed Switch Sensitivity Tests (Mechanical Type Switch) (Code “A") 13-3

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