Hydraulic Operation for Home Elevators in California & Nevada

Hydraulic Operation - First ImageQuality 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:  Roped 2:1 Hydraulic
Capacity:   750 lbs. up to 1400 lbs
Car Speed:  40 FPM, higher speeds available.
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.

Low oil control: A low oil control feature shall be provided designed to automatically
cause an up traveling car to descend to the lowest terminal landing if the elevator should
fail to reach a landing in a predetermined time or if the system does not have a sufficient
reservoir of oil.

 

Control System

Hydraulic Operation - Second Image

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.

Hydraulic Power Unit
The hydraulic power unit shall include a submersible motor, rotary screw type pump, two-
speed control valve, and oil reservoir with an oil level gauge.  The control valve shall include a
safety check valve, up and down acceleration, deceleration, leveling, and soft stop
adjustments, pressure relief valve, manual lowering valve, constant down speed regulation,
pressure gauge with shutoff, negative pressure switch, and manual shutoff valve all mounted
and enclosed in a compact unit assembly with a key lockable cover.

Plunger and Cylinder
The cylinder shall be constructed of steel pipe with a steel bulkplate welded to the lower end and
a cylinder head welded on the upper end which houses the self-adjusting packing, bearings,
wiper, air bleeder, and leach line hose. The plunger will be manufactured from accurately ground and
polished tubing fitted with a steel stop ring welded to the bottom to prevent the plunger from leaving
the cylinder in the up direction.

Pipe Rupture Valve
An automatic shut off valve at the cylinder inlet shall be provided to stop and hold the elevator in
the event of a main oil line failure or if the elevator should overspeed in the down direction.

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, 6 X 19, traction steel cables.  
The cables shall dead end to the pit steel on one end, pass over a “U” groove sheave, and
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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