KW Aufzugstechnik GmbH OPERATING MANUAL DAVID-613
DAVID-D613-V125-E 13.04.2021 Page - 88 -
B25- Group
FUNCTION
The group control works according to the principle „flying of the master“ to take over the group control
meaning that each central computer (ZR) is able to take over the group control. It is possible to inter-
connect a maximum of 8 central computers by the group bus and to realize thus groups of eights.
One of the central computer takes over the function of the master, where ZR is the master is unimportant.
The group master fails or switches off, so automatically another central computer takes over this func-
tion. By the group bus all branches of landing call, at which the remote station is tied up, are connected
with all central computers. Thus all ZR has each other the full access to all remote station independently
of. The elevator bus is ased physically on that kind of industrial condition RS485 on one high-speed
minutes runs.
INFORMATION EXCHANGE:
The lining up landing calls are read in by the group master and distributed to the central computers
(elevators) the available distributes. With the distribution information about door times, track curves and
floor distances of the individual lifts is considered. The master knows exactly, how long a trip lasts the
door in the started goal stop from floor X to floor Y, how long it lasts, to open itself and additionally the
master knows the average driving on the time in this stop place. Further are well-known the master all
lying close interior and other calls well as the loading condition of all elevators. All these information
makes an intelligent, optimal traffic management possible.
CALL DISTRIBUTION:
A new landing call is accepted, the group master with the above mentioned information from all lifts the
available will measure exactly, which elevator this landing call in the indicated driving direction fastest
to serve can pass and the landing call on to this elevator. A fully loaded elevater will start e.g. no landing
call, if in these goal floor the elevator has no car calls.
The landing call distribution as well as the exchange of all above mentioned information about the status
of the group elevators in real time 10 times per second one updates. That means the fact that landing
call this already assigned is e.g. removed from the elevator No.1 again and is assigned to the elevator
No.2, if the elevator will be longer No.1 due to a longer driving on time or new interior calls than originally
computed on the way.
The driving on direction for each floor is spent on each elevator at the remote station ER.
This should be absolutely represented for each elevator optically, so that the passengers can go before
the arrival of the cab to the correct elevator.
ADVANTAGES OF THE STRATEGY
A direct entry and a mechanism of kind of snapping (premagnetion last to the door close motion) the
group concept can be supported by the regulation. The advantages of an optimized call dispatching
under consideration of the condition model of the single elevators result in the thereby:
- Even extent of utilization of all elevators and balanced energy balance of the individual lifts
- Shorter waiting periods in the individual floors and dynamic adjustment to the call arising
- High availability of the group system
- Optimized processing of the external calls guarantees shortest drives
PARAMETER: DOOR DISTURBANCE AFTER
If door handicaps in a stop of the lift arise, e.g. to photoelectric cell blockings, then the plant goes to
applying the adjusted time out of the group enterprise. Other lifts can take over the processing of the
available calls and start the blocked stop.
PARAMENTER: ALLOCATION OF THE ENTRANCES AND EXITS FOR THE GROUP
ENTERPRISE
Two lifts divide a remote station. On the remote station there are free programmable in- and outputs
channels:
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