Machine Room Less (MRL) Elevator Design

For mid to high rise applications, where hydraulic elevators can’t be used, Machine Room-less (MRL) traction elevators are a preferred option. As it doesn’t necessarily require an overhead machine room, the MRL design saves space, lowering the building overall height and thus resulting in lower construction cost.

MRL elevators are designed with a gearless machine, ropes and counterweights instead of hydraulic equipment. Guide rails are mounted on each side of the car and counterweight rails are located on one side. The gearless machine, along with the related drive equipment is all installed inside the shaft eliminating the need for a construction of an overhead machine room.

Advantages of MRL elevators are:

• Higher speed & capacities
• Higher travel & number of stops
• Robust machine with higher number of starts per hours
• No need for an overhead or adjacent below machine room
• Smaller capacity motors with greater power efficiency than hydraulic applications

Product model range with available Load Capacities, Cab sizes and required Hoistway shaft sizes:

Hoistway Shaft Sectional Information:

• Maximum number of Stops: 12
• Maximum Travel: 42.67 meter (140’ – 0”)
• Minimum Overhead required below the Hoisting Beam: 4724 mm (15’ – 6”)
• Pit Depth required: 1676 mm (5’ – 6”)
• Solution available in case of a habitable space below the hoistway shaft

Control room:

• Minimum recommended size to be 1753 mm (69”) Wide x 1448 mm (57”) Deep x 2438 mm (96”)
• Control room located adjacent to the hoistway shaft at Top landing with solutions available for a remote machine room
• Control room door to swing out
• Provided with required guarded light with a switch, GFCI Plug, fire alarm initiating devices etc.
• Control room to be constructed as per elevator code and building code with adequate ventilation to suit heat dissipation from the elevator equipment

Standard Product Features with Available Options are:

• Speed range offered are 1 m/sec to 1.75 m/sec (200 fpm to 350 fpm)
• Duty Load (Load Capacity & Speed) other than mentioned above are available upon request
• General Class A Loading
• Optional Class C loading available for service elevators
• Car sizes other than mentioned above are available upon request
• Solutions available for varied type of Hoistway construction
  
  Cab finishes:
• Recess provided in platform for finished floor by others
• Optional Aluminum/ St Steel checkered flooring
• Walls & Ceiling are in plastic laminated finish
• Optional #4 St. Steel elevator cab/ Glass Panel cab/ Rigidized metal panel finish
• Elevator cab can also be provided in plywood finish with suitable weight contingency for wall cladding, final finishing by others
• Other finishes may be available upon request.
   

Entrances:

• 2-Speed horizontal sliding, Automatic operation, provided in prime/powder coated finish
• Optional Single Speed Entrances/ Centre Opening Entrances
• Optional #4 St. Steel entrances with/ without glass inserts in the door panels
• Aluminium sills with option for St. Steel/ Nickel Alloy entrance sills
• Other finishes may be available on request.

Signals included:

• Car LED Lighting
• Car Operating Panel to include: Emergency Light, Capacity Tag, Cab Position & Directional Indicator, Landing Selection Button, Door Open/Close Button, Fire Fighters’ Cabinet, Alarm Button, Autodialer Button & Speaker, Keyed Stop Button, Independent Service Keyed Button
• Optional service cabinet in COP
• Arrival lights with chime
• Provision for security card for restrictive access & Camera

Safety Features:

• Handrail
• Infra-red door curtain
• Battery operated alarm
• Battery operated emergency cab lighting
• Autodialer
• Optional battery operated rescue device
• Fire fighters operation etc.
• Microprocess based controller with
• Simplex or multi group control operation available
• Full collective/ down collective or selective operation

Due to various end users’ functional requirements, site constraints including fire separation requirement between the floors, structural and other building code requirement every elevator proposal is a unique configuration carefully prepared by selecting from the above mentioned product features (and available options). This is to ensure that the selected product configuration suits overall project requirements. Therefore, in order to get a comprehensive design proposal, ensuring that all the requirement have been identified and incorporated in the design at the planning stage, please contact us at sales@expresselp.com. Also feel free to contact us to get a copy of a sample drawing or a copy of our planning guide of all our products. One of our knowledgeable sales members would be happy to assist you and help you prepare a project specific elevator design proposal.