PURPOSE: To prevent the operation of a machine after arbitrary two units of machines are selected and operated, as for a plurality of elevators equipped with a private power generation device.
CONSTITUTION: When the operation instruction relays 1A and 2A for the No.1 and No.2 elevators are turned ON, the relays 1A and 2A selfhola and continue operation, and when the second elevator is turned ON, a relay 1B for interlocking is turned OFF, and the No.3 and No.5 elevators can not be turned ON. When an arbitrary No. elevator is selected, the relay 1B for interlocking is turned OFF similarly after the second machine is operated, and the third machine and the succeedings can not be operated. Accordingly, two units of elevators which are arbitrarily demanded to be driven can be selected and operated free from the group formation.
HARA TAKAAKI
SATO HIDEAKI
HITACHI ELEVATOR ENG