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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.
Elevator Operation
In order to gain further understanding of how a HydroFit™/HydroAccel elevator system
works, let’s take you through a typical sequence of operation. A passenger registering an
elevator call sets into motion a series of actions. The signal is first picked up by the
controller, which acknowledges the request by illuminating an indicator on or near the call
button. Also placed into memory is the location of the call for pickup or delivery. All hall
calls are sent to all elevators, if part of a group. (Multiple elevators within a building are
referred to as a “group” of elevators.) Each elevator in the group calculates its response
time to the call and the elevator with the shortest response time is dispatched to pick up
the passenger. The elevator checks itself against a preflight checklist before permission
to run is given. Of particular importance is determining the integrity of the elevator’s
safety related devices prior to starting the run. In addition, the elevator contains a safety
chain to prohibit elevator motion in response to an unsafe condition. The safety chain
consists of electronic and electromechanical switches placed at strategic locations in the
elevator system. Connected in series, they act as a safety circuit ensuring various
elevator apparatus are in the correct operating state for the elevator to make a run. Any
one device not in its expected state breaks the chain and the elevator does not operate.
An emergency stop is initiated whenever a safety chain device “opens” while the elevator
is in motion. When the controller (the brain of the elevator) receives a request for
service, it reviews a sequence of questions and issues instructions according to the
responses.
Controller Sequence of Questions
Where do I need to send the elevator?
What is the weight in the car?
Is it safe to move the elevator?
While I’m moving, how do I know where I am in the hoistway?
How do I stop once I’ve reached the destination?
What do I do after I’ve stopped?
The Controller now has instructions to move the elevator car in response to the
passenger call and has completed its safety check confirming that the elevator is safe to
move. It then sends instructions to the elevator control circuits telling the elevator car
which direction to move.
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