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TOWER CRANE OPERATION AND SERVICE MANUAL 5.3.2 Wiring of cable drum The outer power supply cable pass through the roller box (see Fig. 5.3-1), as per the direction of arrow in Fig. 5.3-2 to induct the drum inner ring, via the inner hole of the reducer output shaft to get into the slip ring, connect with three real line connecting plates of the slip ring inner ring and a zero connecting plate; the service motor cable via the cable elbow into the slip ring, and connect it to the conductor clip on current conducting plate of the slip ring outer ring. The marked current conducting plate connect with zero line, the other three current conducting plates connect with the real line. (See Fig. 5.3-2, the P view.) Moment motor Slip ring Reducer Drum Cable Bracket Roller box Fig. 5.3-1 5B-2 en-version 2.0
