Radwan Tareef (0167120)

Wednesday
[CONTROL LAB PROJECT] November 26, 2020

Introduction

Elevators are prevalent throughout many multi-level structures. They control the flow of
foot traffic between various floors of buildings, they allow disabled persons to access
upper-level floors, and they facilitate the movement of large items (such as furniture and
office equipment) between various levels of the building. This project about viewing
overall behaviour of the "elevator system" as a combination of systems the user, the
elevator system, and the elevator control system.

Project problem statement

Development of a complete flow chart algorithm of the sequence controller operation
depending on the input and output signals shown in figure 1, such that after checking on
the whole system by the operator if there is any maintenance required after that the
user can use it by calling the elevator by clicking the direction buttons that are located in
the elevator hall, there are some sensors in our system such as position sensor to
identify on which floor is the elevator car, lifting system checks if there is an overload in
the car, floor and direction indicators helps the user to track the elevator.

Figure 1: Project problem

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 Radwan Tareef (0167120)
Wednesday
[CONTROL LAB PROJECT] November 26, 2020

Solution method and philosophy

Table 1: Sequence table

etatS
Direction Hold
Step Button Floor Emergency Floor Direction Door Lifting Position Motor
Car (Up/Down) Door
status Buttons Stop Indicator Indicator Controller Sensor Sensor
Button
key Button
control

1 1 0 0 0 0 0 0 0 0 0 0 metsyS
foo
2 0 0 0 0 0 0 0 0 0 0 0 System
on
3 0 1 0 0 0 1 1 0 0 1 1 Elevator
start
0
moving
4 0 0 0 0 0 1 0 1 1 1 0
Doors
open and
the user
enters

0
0

5 0 0 1 0 0 1 0 0 1 1 0
0 User
enters the
elevator
and the
lifting
sensor
checks if
there
overload
6 0 0 0 1 0 1 1 1 0 1 1 Elevator
start
moving
and
sensors
check if
there
other
passenger
Where 1 is normally ON and 0 is normally OFF.

Page 2
 Radwan Tareef (0167120)
Wednesday
[CONTROL LAB PROJECT] November 26, 2020

Control sequence in flow chart

Operator

Yes No
Need
maintenance
Pwr

System off System on

User
Apply
maintenance DB

Request
elevator

Yes

Up?

No Close door if
open

Go up

Page 3
 Radwan Tareef (0167120)
Wednesday
[CONTROL LAB PROJECT] November 26, 2020

Down? Yes

No
Close door if
Elevator at the Stopped? open
same floor
EDC
Go down
Door is open and user enters
(Idling)

LS
Yes
Overload

No Open
door

Yes
HDB
pressed

No Open
door

Request
floor #

FB

Close
door

Page 4
 Radwan Tareef (0167120)
Wednesday
[CONTROL LAB PROJECT] November 26, 2020

Yes
ESP Stop

No

Yes No
Request along current path

Stop at Finish
requested current
floor path

DI
PS
Change
direction
Elevator
arrived

FI
Open door

Passenger exits

Yes
Check for Back to request
user input elevator step

No

Idling

Page 5