Power Systems for Emergency Evacuation Lifts
EPS 20 Series
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 the Local Government of Cambridgeshire County Council have embarked upon a pioneering initiative to provide purpose built standby power systems for dedicated emergency evacuation lifts to be installed in schools, libraries, hospitals, and other public buildings.
The Emergency Power System (EPS) can be used on any dedicated lift (elevator), whether traction or hydraulic. The unit is cost effective and eco-friendly as it uses little energy in quiescent mode, consuming only 50 watts of electricity; 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 EPS 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 a PWM inverter with integral output transformer for galvanic isolation. An automatic bypass feature is also provided.
In an emergency evacuation situation or when the public power supply fails, an authorised person controls the EPS from 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 elevator or on the control panel in the lift car, and once activated powers the lift (elevator) hoisting system from its internal inverter and batteries independent of the mains power. The “on emergency power” button at the control point illuminates to signal power is being provided to the lift (elevator) traction system from the EPS system. It is then possible for the authorised person to operate the elevator 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 emergency power supplies comply with BS EN 60146 and are specifically designed for use with lift (elevator) 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 hoisting systems with reverse energy recovery, load resistors and braking systems.
Features
- Local /remote logic control
- Wall mounting maintenance bypass unit
- Remote control key switch
- Power flow status mimic panel
- Low noise level
- Power consumption less than 100 Watts in quiescent mode
- Fitted with Input and output flexible cables
- Input and output plugs & sockets
- Systems of 10kVA, 20kVA and 30kVA
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