BS/EN 81-77-2013 pdf download.Safety rules for the construction and installations of lifts Particular applications for passenger and goods passenger lifts Part 77: Lifts subject to seismic conditions.
5.9 Machinery and other lift equipment
All machinery including control cabinet(s) and drive system, lift machine, main switch(es), and means for emergency operations, cylinder and ram, pulleys and associated overhead beams and supports, rope attachments, overspeed governor, tension pulleys and compensation rope tension devices shall be designed and anchored to prevent overturning and displacement as a result of the forces imposed on them including forces generated by the design acceleration (ad).
Hydraulic lifts shall preferably use flexible pipe work but where the use of rigid pipe is essential it shall use flexible pipe at the end of each rigid length.
5.10 Electric installations and appliances
5.10.1 Electric installations in the lift well
The fixing of landing switch devices or final limit switches, vanes or similar devices fixed in the shaft shall be designed and installed to withstand the loads and forces imposed on them including forces generated by the design acceleration (ad). In addition, the devices mentioned above shall be protected by guards against damage caused by ropes and cables swaying in the well.
5.10.2 Behaviour of the lift in case of failure of the mains power supply
In case of seismic events, for seismic lift category 2 and 3, in order to avoid people to be trapped in the car in case of failure of the nomal power supply, the lift has to be able to move automatically the car to the next landing in up or down direction
At landing the lift shall operate as described below:
a) A lift with automatic power operated doors, when parked at a landing, shall open the doors, remove the lift from normal operation and keep the door open.
b) For a lift with manually operated doors, when the car arrives at the designated landing, its door(s) shall be unlocked and the lift removed from normal operation.
Where local regulations do not permit the doors to remain open, a means shall be provided to open the doors (even with the electrical power on) enabling the rescue service to check whether the car Is present and persons are not trapped (see EN 81-f :1998+A3:2009, 0.2.5 and EN 81-2:1998+A3:2009, 0.2.5).
The automatic dispatch to the lowest landing as defined in EN 81-2:1998+A3:2009, 14.2.1.5 b) shall be rendered inoperative.
The behaviour of the lift in case of failure of the normal power supply shall not override any of the following:
C) the electric safety devices;
d) the inspection operation (EN 81-1:1998+A3:2009 and EN 81-2:1998+A3:2009, 14.2.1.3);
e) the emergency electrical operation (EN 81-1:1998+A3:2009, 14.2.14);
f) the firefighters lift switch (EN 81-72:2003, 5.8).
5.10.3 Seismic detection system
5.1 0.3.1 A seismic detection system shall be provided for lifts with counterweight or balancing weight in seismic lift category 3.
5.1 0.3.2 Where the seismic detection system is used exdusively to send information to the lift it may be placed in the pit of the lowest lift in the building. In case of expected interference with other vibration sources. alternative locations of the seismic detection system are allowed (see assumption in the Introduction).
5.10.3.3 The seismic detection system shall comply to the following specifications:
— detection of tn-axial acceleration:
— seismic trigger level ≤ 1,00 m/s2 In any direction including vectors;
NOTE ‘Vecto?’ relates to the resulting acceleration from combined reactions in x, y and z planes.
— frequency response between 0,5 Hz to 10 Hz:
— system reaction time s (5.10.3.5):
5.10.3.4 Availability and diagnostics
The seismic detection system shall be able to operate at all times when the lift is intended to be available to users.
The seismic detection function, including interface between seismic detector system and lift controller, shall be tested every 24 h. If a failure is detected during the test or the interface between the seismic detection system and the lift controller is interrupted, the lift shall remove itself from normal operation on Its next stop at a landing and park with its doors open
5.10.3.5 System reaction time
The system reaction time shall not exceed 3 s. The system reaction time descnbes the maximum allowed time period between the point in time when the seismic wave exceeds the selected seismic trigger level for the first time and the point in time when the lift switches into the seismic mode described in 5.10.4.
5.10.3.6 Emergency electrical power supply
The operation of the seismic detection system shall not be impeded or lost even in case of electrical power supply switching or mains power supply failure. When an emergency electrical power supply is used it shall be able to provide at least 24 h of power supply.
5.10.3.7 Resetting of the seismic detection device
The resetting of the seismic detection device and the return of the lift to normal operation shall only be made by operation of manual reset devices.
The manual reset device of the lift shall be placed outside of the well, clearly identified, and accessible to authorized persons only (maintenance, inspection and rescue). e.g. inside a locked cabinet.
5.10.4 Behaviour of the lift in seismic mode
After activation of the seismic detection system. the lift shall perform as described below:
a) All registered car and landing calls shall be cancelled. New calls shall be ignored;
b) A lift in motion shall reduce the speed or stop and proceed to the next possible landing away from the counterweight or balancing weight with maximum 0,3 m/s car speed.
C) When lift is at landing:
1) a lift with automatic power operated doors shall open the doors, remove the lift from service and keep the doors open;BS/EN 81-77-2013 pdf download.