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Electrical Engineering/Uninterruptible Power Supply (UPS) for Elevators.


QUESTION: Dear Prof Cleggsan‎

Can Uninterruptible Power Supply (UPS) provide a battery backup for Elevators / Lifts in case the mains power goes up ?.

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

ANSWER: I like the answer you got from ZZ.  I have nothing to add to those comments.  Good Question, but a very complicated solution due to the various escalator designs and equipments let a lone the great power necessary - especially for tall buildings which require tremendous lifting power.

A typical computer where a UPS might be employed is around 200w to 300w.

Hope this helps.

---------- FOLLOW-UP ----------

QUESTION: Dear Prof Cleggsan

Thank you.

1. Is it possible to use more than One UPS in series or parallel after computing the elevator power consumption ?.

a. When the mains supply goes, the elevator will come to ground floor for the people to exit / come out of the lift.

b. The Elevator will continue working for specific INTERVAL - hours depending upon the UPS Batteries power output. The UPS Batteries will be charged from AC Mains supply once the power is restored.

c. Elevator controls will indicate to the people inside the elevator using Alarms or LED Blinking that the elevator is using the UPS Battery Backup power and also indicating the Battery Backup time remaining for the Lift Operational. For example : 3 Hours remaining, with a decrements counter
in Hours:Minutes:Seconds.

2. Can this be possible to implement within Elevator electronic panel controls ?.

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

As ZZ informed you, the likely hood is due to the unique requirements of the lift power system and the control/safety/security system the final design of such a proposed elevator enterprise may require 2 or even 3 power supply structures, each with its own set of voltage and current requirements.  Building circuits may be coming from different breakers that will power out under different times and conditions.  Check with building people about how wiring and circuit allocations are handled.  I suspect that lift power is big breaker supply whereas timing and control circuitry may come from low level circuit with different breaking points.  And, building codes from municipal authorities may have big influence on how power systems must be wired and controlled.


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