Figure 5-14. Load Circuit Breaker CB101, Rear View (Sheet 1 of 2)

Figure 5-13. Load Circuit Breaker CB101, Rear View

Figure 5-14. Load Circuit Breaker CB101, Schematic (Sheet 2 of 2)

TM-9-6115-604-34 Generator Set Diesel Engine Driven Tactical Skid Mtd 5 Kw. 1 Phase-2 Wire 1 Phase -3 Wire 3 Phase -4 Wire 120. 120/240 and 120/208 Volts Manual
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TM 9-611560434 NAVFAC P+633-34 Figure 5-14. Load Circuit Breaker CB101, Rear View (Sheet 1 of 2) (1) Drive Spring Charging. Assume that the interrupter contacts are in the open position and that the drive springs (Figure 5-15) and the return springs (Figure 5-16) are discharged. When power is supplied to the breaker control circuitry, the spring charging motor (Figure 5-15) is energized. The motor eccentric (Figure 5-17), mounted on the charging motor shaft, drives the ratchet arm assembly backward and forward. With each forward stroke of the ratchet arm, the spring loaded drive on the gear advances the gear a few degrees counterclockwise. The holding pawl holds the gear in position while the drive pawl makes its reverse stroke to engage another tooth. The gear is free to rotate on the gear shaft. As the gear is advanced, the drive block, mounted on the outside face of the gear, engages the gear on the drive hub and rotates the drive hub. A roll pin connects the drive hub to the gear shaft and drive lever (Figure 5-15). The gear shaft and drive lever thus rotate with the drive hub. As the drive lever rotates, the lifting roller on the drive roller contacts the lift arm on the drive shaft (Figure 5-17) and pushes the lift arm up, rotating the drive shaft counterclockwise. The counterclockwise drive shaft rotation compresses the drive springs until the spring load against the drive lever passes top dead center and attempts to discharge. At this point, the drive lever rotates a few degrees until the trip closing roller (Figure 5-15) on the drive lever can rotate no farther and the drive springs are held on this charged position until a closing operation is initiated. When the drive springs reach the fully charged position, the charging motor limit switch cam (Figure 5-16) allows the charging motor limit switch to open, deenergizing the charging motor. Simultaneously, the pawl lift slide (Figure 5-17) is pushed forward by the cam lobe on the drive hub so that the drive pawl rides on the pawl lift slide and does not engage the gear. This arrangement allows the charging motor and ratchet assembly to coast smoothly to a stop. 5-36

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