A lift ARD, or automatic rescue device, moves a stranded car to a floor after a power cut. Without one, trapped passengers wait for a technician to carry out a manual rescue. The device sounds simple, but it relies on a healthy battery, working controls and the right drive design. Those details decide whether it actually works on the day.

This guide explains how ARDs work, using Mitsubishi Electric product data, a Texas Instruments technical note and an Otis patent filing. It sets out the limits owners should know and how ARDs differ from lift alarms and backup generators. It also lists what an AMC visit should check and record. Finally, it addresses whether ARDs are mandatory in UAE buildings.

What is a lift ARD?

A lift ARD is a battery-backed unit that takes over when mains power fails and brings the car to a landing. Texas Instruments describes it as continuously monitoring the elevator mains supply. During normal operation, the ARD keeps its backup battery charged and ready.

Lift makers market the same idea under their own product names. Mitsubishi Electric's Emergency Landing Device moves the car to the nearest floor on a rechargeable battery, then opens the doors. The aim is to let trapped passengers out without waiting for a technician's manual rescue.

Quick Answer

A lift ARD is a battery-backed unit that monitors mains power and, on failure, brings the car to a nearby landing. Manufacturers such as Mitsubishi Electric sell their own versions.

How does an ARD bring the car to a floor?

When mains power fails, the ARD immediately powers the elevator drive from its battery. The controller then releases the brake and, in powered designs, moves the car to the nearest landing. Another inverter inside the ARD supplies the control circuits, according to Texas Instruments.

Once the car is level at the floor, the doors open so passengers can leave. Texas Instruments lists typical ARD battery voltages of 24 V, 36 V, 48 V and 60 V. Battery size limits how far the car can travel, which matters in tall buildings.

Quick Answer

On power failure, the ARD powers the drive from its battery, the brake releases and the car moves to the closest landing. The doors then open for passengers to leave.

What are the limits of an ARD?

ARDs have limits set by battery capacity, travel distance and drive design. Mitsubishi Electric states a maximum floor-to-floor distance of 11 metres for its standard device and 40 metres for its high-capacity version. Express zones in tall towers can exceed what a standard unit covers.

Simpler systems that only release the brake depend on a load imbalance between car and counterweight. An Otis patent notes such rescue fails without imbalance and moves the car one way only. A weak battery or an open safety circuit can also prevent a rescue.

Quick Answer

ARDs are limited by battery capacity and travel distance, such as Mitsubishi's 11-metre and 40-metre maximums. Brake-release systems also need a load imbalance and move the car one way only.

How is an ARD different from the lift alarm and generator?

An ARD moves the car, while the lift alarm only connects trapped passengers to help. Malta's lift regulator summarises EN 81-28 as requiring two-way voice and one hour of battery backup. That alarm should also run an automatic self-test at least once every three days.

A building generator is different again, because it powers selected lifts from the building supply. Mitsubishi Electric's emergency power operation sends predetermined cars to a specified floor and opens the doors. Buildings may have all three, and each needs its own test in the AMC.

Quick Answer

An ARD moves the car to a floor, while the EN 81-28 alarm provides two-way voice contact with backup power. Generator operation powers selected lifts from the building's emergency supply.

What should an AMC visit check on the ARD?

An AMC visit should check the ARD's battery condition, charger output, connections and any fault indications on the unit. Batteries age even when unused, so their installation date and replacement interval belong in the records. Manufacturer instructions should set the exact checks and battery life.

A controlled power-failure test is the clearest way to prove the car actually travels and the doors open. Our lift entrapment rescue guide explains what happens when automatic rescue is not available. We found no published UAE rule requiring ARDs, so check each lift's specification.

Quick Answer

Each AMC visit should check the ARD battery, charger, connections and faults, with a controlled power-failure test proving travel and door opening. Record the battery's installation date and replacement interval.

Frequently Asked Questions

Is an ARD mandatory in the UAE?
We found no published UAE-wide rule making ARDs mandatory for existing passenger lifts. Check the lift's approved specification and any conditions set by the authority that originally approved the building.
What is the difference between an ARD and a UPS?
An ARD moves the lift to a floor and opens the doors after a power cut. A general-purpose UPS keeps equipment powered but runs no lift rescue sequence by itself.
Can an ARD be added to an existing lift?
It may be possible, but compatibility depends on the controller, drive and brake design. A qualified lift contractor should assess, install and test any retrofit before it goes into service.
How far can an ARD move the lift car?
It depends on battery capacity, rated speed and car load. Mitsubishi Electric quotes up to 11 metres between floors for its standard device and 40 metres for its high-capacity version.
Why might an ARD fail during a real power cut?
Likely reasons include an aged battery, a charger fault or a car with no load imbalance on a brake-release system. Regular controlled tests reveal these problems before passengers are trapped.
Does an ARD replace the lift's emergency alarm?
No, the ARD moves the car, while the alarm lets passengers talk to a rescue service. Lifts still need an emergency alarm; EN 81-28 alarms add battery backup and self-testing.
How often should ARD batteries be replaced?
Follow the ARD manufacturer's stated battery life and replace earlier if tests show reduced capacity. Recording the installation date on the lift file makes the replacement point easy to plan.
What should happen after an ARD rescue?
The contractor should inspect the lift, check the ARD battery and record the event before normal service resumes. Repeated power-cut rescues may justify a review of the building's electrical supply.
Is an ARD the same as Mitsubishi's Emergency Landing Device?
They serve the same purpose, moving the car to the nearest floor on battery power after a failure. Emergency Landing Device is Mitsubishi Electric's product name for its own version.
Who should test the ARD?
The lift maintenance contractor should test it, following the manufacturer's instructions and safe working procedures. The building team should receive a dated, signed record of each test and its result.

Main Takeaways

A lift ARD uses a charged battery to bring a stranded car to a landing and open the doors after a power cut. Its range is limited, such as Mitsubishi's 11-metre and 40-metre maximums. Brake-release systems also need load imbalance and move one way. AMC visits should check the battery and charger and periodically prove rescue with a controlled test.

Your next step for lift ARD maintenance

A lift ARD can turn a frightening entrapment into a short, controlled stop at the nearest floor. It only works if the battery, charger, controls and drive design all support the rescue sequence. Its range is limited, and simpler brake-release designs depend on load imbalance. Knowing those limits helps owners decide where an ARD genuinely adds value in their building.

Ask your lift contractor which lifts have ARDs, what type they are and when their batteries were installed. Add a periodic controlled power-failure test to the AMC, with a dated record of the result. Our lift breakdown guide covers response times when a manual rescue is still needed. QSERV's elevator breakdown repair service supports buildings across Dubai when lifts fail.

Sources & References

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