Cable Drive Operations for Home Elevators in California & Nevada

Cable Drive OperationsQuality Assurance
The elevator will be designed, manufactured, installed, and inspected in accordance with ANSI/ASME
A17.1 standards and all applicable regulations of federal, state, and local codes and ordinances as
adopted by local agencies having jurisdiction.

References
1. American National Standards Institute (ANSI)
2. American Society of Mechanical Engineers (ASME)
3. National Electric Code (NFPA 70)
4. CSA B44.1/ASME A17.5, elevator and escalator electrical equipment requirements.  

Characteristics
Type:  Overhead Winding Drum
Capacity:   750 lbs. up to 950 lbs
Car Speed:  40 FPM.
Operation:   SAPB/single button collective
Travel: Up to 50 ft
Inside Car Dimensions:  Typical dimensions start at 36” wide X 48” deep X 80” high, custom sizes are available.
Power Supply:  220 Volt, single phase, 60 Hz.

Equipment
Operation of the elevator shall be single automatic push button or single button collective (field
programmable); momentary pressure on any button will call or send the elevator to the
corresponding landing providing all doors are closed.

Battery lowering: In the event of a power failure, the elevator shall automatically
descend to the homepark landing, wait 30 seconds, then proceed to the bottom landing
while monitoring all safety circuits.  If the elevator is equipped with a power car door(s)
option, the car door(s) shall open and close automatically.  Batteries are to have an
automatic charging system.

Emergency car lighting: In the event of a power failure, the car lights shall automatically
transfer to battery power.

Homepark feature: The elevator shall automatically return to a field programmable
designated landing after one minute without use.

Automatic two-way leveling: The leveling device shall automatically stop and maintain the
car within ½ inch of the landing regardless of the change in load.

Protection Run Timer: An internal run timer that will cause the car to stop and hold if the
elevator should fail to reach a landing within a pre-determined time.

Control System
A microprocessor based control system certified and labeled to the requirements of
CAN/CSAB44.1/ASME A17.5 shall be provided.  It shall include a motor starter with a potential relay,
motor overload device, an uninterrupted power supply with battery charging circuit, and
external relay redundancy circuits to prevent dangerous conditions as a result of a single
contact failure.  All circuits shall be fuse protected. All to be enclosed in a single NEMA 1
lockable cabinet.

Machine Limit
In addition to the normal car stopping devices, top and bottom normal limit switches, top final limit
switch and slack cable switch, the driving machine will be fitted with a rotary limit switch that includes
(2) independently operated contacts that are designed to disconnect power to the driving machine in
the event that the car over-travels the top or bottom landing.

Overspeed Governor
An overspeed governor shall be provided in the overhead and a tension weight with idler sheave shall
be located in the pit.  The governor cable shall be ¼” dia. 8×19 traction steel and attach to the car
safety device.  The governor shall be designed to activate the car safeties in the event of an
overspeed in the down direction.  Governor shall be self resetting and be provided with means to seal
the tripping speed adjustment.

Driving Machine
The driving machine shall be located at the top of the elevator hoistway.  It shall include a two-stage
ring and worm gear reducer, inverter controlled flange mounted motor, a spring applied and
electrically released disc brake assembly with manual release handle, a drum with accurately
machined grooves to guide and support the hoist cables, an outboard pillow block bearing to support
the drum shaft, a manual lowering hand wheel, and an emergency stop switch all to be mounted on a
structural steel base.  Elastomeric sound absorbing isolation mounts shall be furnished between the
machine base and its mounting.

Car Frame and Platform
The car frame shall be fabricated from structural and formed steel members, welded and bolted
construction, of the cantilevered design.  It shall be fitted with roller guide shoes, broken rope car
safeties, and a slack cable switch that will disconnect power to the control valve if a rope should
be become slack or broken.  The car platform shall be fabricated from 1-1/4” plywood protected
with a fire retardant material.

Car Suspension
The elevator car frame shall be suspended by (2) 3/8” diameter, 8 X 19, traction steel cables.  Cables
shall attach to the car safety device with approved type wedge sockets.

Guide Rails
The car guide rails shall consist of (2) machined steel “tee” sections, no less than 8 lb. per foot,
securely fastened to the hoistway structure with steel brackets.  All rail end sections shall be
tongue & groove type joined with steel splice plates.

Car Operating Panel
Car operating panel shall consist of metal lens call push buttons with red LED halo lighting for
each landing, an alarm button, emergency stop button, light switch, and a digital car position
indicator with car direction arrows all mounted onto a brushed stainless steel faceplate (brass
optional).  Digital C.P.I. shall be field programmable.

Landing Controls
Landing control stations shall consist of a metal lens call button and a “car here” indicator with
red LED halo lighting mounted onto a brushed stainless steel faceplate (brass optional).  

Door locks
An electro-mechanical unit system contact and lock shall be furnished for each hoisway
entrance.  The interlock device shall prevent elevator operation unless all doors are
closed and locked and prevent opening of a door when the car is not at that landing.

Machine Room
1. An adjacent machine room built to conform to the layout drawings, NFPA 70, ASME A17.1,
and all applicable building code requirements.  It shall have suitable access, a lockable
door, a convenience outlet, and light switch.  Machine room temperature must be
maintained between 60 and 100 degrees Fahrenheit.  Relative humidity not to exceed 95%.
2. A telephone line to the machine room and tied into the elevator controller as per
ANSI/ASME A17.1 code.
3. Machine room vents as required by local code.

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