ELEVATOR POWER RESOURCE HAVING VVVF METHOD AND CAPABLE OF EMERGENCY DRIVE FOR POWER FAILURE

摘要

The VVVF-mode elevator power source includes a motor, a converter for converting AC into DC, an inverter for outputting a predetermined low frequency loaded on the DC, an elevator controller, a battery and charger whose input is connected to the contact of a relay and whose output is connected to DC power supply ports of the inverter, a small UPS whose input is connected for supplying AC to the elevator controller, and a relay/timer sequence circuit having a plurality of relays and timers, thereby enabling passengers to land safely in power failure.