AUTOMATIC LANDING DEVICES OF AC ELEVATOR IN INTERRUPTION OF ELECTRIC POWER TIME

摘要

The AC elevator system has an automatic floor arrival appts. for automatically bringing an elevator cage to a nearest floor upon power service interruption. The arrival apparatus comprises a DC power source to supply output current to the elevator system when the AC power source is interrupted. A voltage and frequency controller variably controls the output of the DC power source with respect to voltage and frequency. A start running command delivers a start running commnad to the voltage and frequency controller upon the service interruption of the AC power source.