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Insert to document GEK-64459D and GEK-64460A Breaker operation This is an insert to the maintenance manuals for AKR 30/50 (GEK 64459D) and AKR 75/100 (GEK64460A). The insert describes the operation of the breaker with the newly introduced electronic closing system. For the AKR 30/50 insert to section 5 starting on page 11. For the AKR 75/100 insert to section 4 starting on page 10 Replacement Parts Replacement printed circuit board assembly for 48 VDC applications: #10060126G1 Replacement printed circuit board assembly for all other voltage applications: #10060126G2 2/10/97 E.2 ELECTRICAL CLOSING On electrically operated breakers the closing springs are charged by a gear motor. With the springs discharged, voltage applied to the control circuit will energize the motor through the "G" switch contacts - see Fig. E1. The motor, through the gear reduction output crank, compresses the closing spring until they are fully charged. As this fUlly charged position is reached, mechanically operated switches "F" and "G" reverse their shown position, the "G" switch deenergizing the motor and the "F" switch establishing a circuit to the One-Shot electronic. With the closing spring propped fUlly-charged, the breaker is ready for closing. This may be accomplished electrically by depressing the closing switch "PB" on the breaker (if so equipped) or by a remote closing switch. Operation of the closing switch energizes the One-Shot electronic, witch in turn energizes the closing solenoid "CC". This removes the prop, releasing the closing springs to close the breaker. As the One-Shot electronic is energized through a closing contact, the "X" relay is energized as well. The "X" relay will latch in and therefore prevent a second closing operation on the breaker in the event it is tripped open automatically. The closing signal must be released and reapplied before a second closing operation can occur. The closing springs on the electrically operated breakers can be manually charged. (X) (+) LEGEND CC F G L M PB (Y) (-) FIG.E1 - ELEMENTARY DIAGRAM FOR ELECTRICALLY OPERATED DRAWOUT BREAKER. CONTACT POSITIONS ARE SHOWN WITH BREAKER OPEN AND CLOSING SPRINGS DISCHARGED. TYP # 183L712 &# 568B736 "E" SERIES X OS CLOSING SOLENOID CUTOFF SWITCH, CLOSED WHEN CLOSING SPRING IS FULLY CHARGED. CUTOFF SWITCH. OPEN WHEN CLOSING SPRING IS FULLY CHARGED. AUXILIARY SWITCH CHARGING MOTOR CLOSE PUSH-BUTTON ON BREAKER ESCUTCHEON, OPTIONAL. CONTROL RELAY ONE-SHOT ELECTRONIC. PULSES THE CLOSING SOLENOID FOR 250 MSEC.
