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HYDROFIT™ Owner’s Information Manual
WARNING: The use and ownership of this work is defined in the legend upon the front page hereof.
Limit/Stopping Switches are a backup system to stop the elevator in the unlikely
event it should travel beyond the top or bottom landings. This is a safeguard against
a communication breakdown in the positioning system. Elevator safety is Otis’
primary concern and most systems have been designed with both electrical and
mechanical safety measures. When one of these mechanical switches is activated,
a series of events take place to prevent an accident. For example, if the elevator is
traveling up and goes beyond the top landing the limit/stopping switch will cut power
to the motor, restricting the flow of oil to the plunger.
Door Operators and Control Devices
Safe and rapid response to elevator calls is an important measurement of elevator
performance. How quickly passengers can enter and exit the car contributes to the
overall performance of the elevator system, the speed at which the doors can safely open
and close is a contributing factor to achieving this goal. At each landing there is a set of
hoistway doors. The hoistway doors and car doors open in unison because of the door
vanes and interlock system. Each entrance landing is furnished with an interlock and
switch. The door vane is fastened to the elevator car door. When the elevator stops at a
landing and its door starts to open, the vane engages the roller of the hoistway door
interlock. This causes the lock to separate from the switch and open the entrance door
along with the car door. If the car doors do not completely close within a predetermined
time, they will reopen and then begin to close at a reduced speed. The car will extinguish
its hall and car direction lanterns, sound the in-car buzzer, and, if part of a group, remove
itself from group operation. If the car cannot close its doors after three attempts, it will
shut down and park with the doors open. Every two minutes the car will retry closing its
doors.
The latest door operators designed by Otis use closed-loop control technology.
Environmental conditions, such as debris caught in the door closing path or excessive
wind in the hoistway, can prevent a door operator from performing 100 percent efficiently.
Closed-loop control compares the door’s actual opening/closing speed to the speed
stored in computer memory and then adjusts the door speed accordingly.
Car Door Protection Device
The car door protection system features an invisible “safety net” of infrared beams that
help ensure the physical well being of passengers.
Using infrared emitters and detectors to create an invisible safety net across the
entrance, the system continually scans for interrupted beams. If a beam is interrupted,
the car door protection system reopens the door instantly. When an obstruction is
present, the doors remain open until the obstruction is removed. If the obstruction enters
the doorway as the doors are closing, the doors stop closing and reverse direction.
Emergency Lighting
Your elevator has a supplemental emergency power supply. If main power is lost,
power is switched automatically to the emergency supply and lights two lamps inside
the elevator. The lamps remain lit for at least four hours.
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