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High Efficiency Power System for Emergency Evacuation Lifts

02 August 2010

Power Systems International and Cambridgeshire County Council develop a high efficiency power system for emergency evacuation lifts. As a result of the changing and more demanding environment for duty of care, there is the need to improve the facilities for the evacuation of disabled, injured or incapacitated persons from public premises.

Power Systems International in collaboration with Cambridgeshire County Council have embarked upon a pioneering initiative to provide purpose built standby power systems for dedicated emergency evacuation lifts. The Emergency Power System (EPS) can be used on any lift, whether traction or hydraulic. The unit is cost effective and eco-friendly as it uses little energy in quiescent mode. The new system consumes 50 watts of electricity in its quiescent mode; i.e. as much as a household bulb. In comparison to a conventional uninterruptible power supply (UPS) of 20kVA that would have losses of 2 kilowatts. For public buildings and schools this is quite a significant energy saving and thus has excellent ‘green’ credentials.

The unit is a compact dimensioned standby power system built in a steel enclosure comprising a high performance intelligent rectifier battery charger, maintenance free battery and an inverter with automatic bypass feature.

In an emergency evacuation situation or when the public power supply fails, an authorised person controls the EPS at the externally located "emergency power" switch by using a remote control key, like the ignition switch in a car. The "emergency power" switch is usually installed adjacent to the call button for the lift or on the control panel in the lift car, and once activated powers the lift hoisting system from its internal inverter and batteries independent of the mains power. The "on emergency power" button illuminates to signal power is being provided to the lift traction system from the EPS system. It is then possible for the authorised person to operate the lift for a prescribed number of journeys which can be as many as 10 upward and 10 downward journeys within the one hour period as stipulated in the EN-British Standard specification.

A summary alarm signal is also provided for connecting to a building management system.

The EPS standby power supply systems comply with BS EN 60146 and are specifically designed for use with lift hoisting systems fitted with VVVF traction drives and three phase induction motors as supplied by OTIS, Schindler, KONE, Mitsubishi, Oakland and many more lift manufacturing companies.

The product can also be supplied for the hydraulic lift hoisting mechanisms using three phase induction motors and for lift hoisting systems with reverse energy recovery, load resistors and braking systems.

To receive a quote or for further information about the EPS systems please contact

Power Systems International Limited

Email: or Tel: 01494 871544

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