Emergency Back-Up Power System For Traction Elevators

A back-up power system for a traction elevator comprising:

• a microprocessor-based control arrangement configured to recognize a loss of an input power supply, as well as irregularities in the power supply, including phase irregularities, the microprocessor-based control arrangement including a control module for generating a control signal to remove the input power supply from the traction elevator and a pulse-width modulated indicator signal;
• an inverter timing system operatively connected to the microprocessor-based control arrangement, wherein the inverter timing system receives the indicator signal from the microprocessor-based control arrangement;
• a back-up power generating means communicating with the inverter timing system, wherein the back-up power generating means generates an output to provide back-up power, wherein the inverter timing system includes a job cycle lockout timer, which limits an amount of time that the back-up power generating means supplies output power and ensures operation of a full elevator cycle prior to returning to normal control power;
• and
• a main power lockout timer, which prevents simultaneous operation of the back-up power system and normal control power.