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Object lesson 3
Inanelevatorwithfrequencyinverterwesuspectthatsometimesthedrivehasanautorestartfault.
We need to confirm this installing a light‐pushbutton in the controller. Its light will be lit on if an
invertererroroccursandremainONuntilwepushthepushbutton.
Programmingforthis
case:
02.51.74.01–Type:adjustedto“1”
02.51.74.10–SET:adjustedto“Invertererror”
02.51.74.11–RESET:adjustedto“P0005”
02.51.74.20–Out:adjustedto“P0005”
Explanation:ElFlipflop0hastheinput“SET”programmedto“Invertererror”whichvalueis1ifthe
invertererrorsignalisread
bythecontroller
If theinput SETis 1 (any invertererror happens) the output P0005becomes1and remains on this
stateeveniftheinputSETchangesto0(inverterautorestart)
In order to reset the value of the output P0005, we need to press the pushbutton, then
the input
P0005changesto1andtheFlipflopresetstheoutputP0005,thenthelightturnsoff
Object lesson 4
At5
th
floorofaHotelthereareamusicbarandaconventionroom.Themusicbaropensdailyfrom
23:00pmto2:00amandtheconventionroomonlyonrequest.
Thestaffofthehotelwantstodisableautomaticallythe5
th
floorwhenthemusicbarisclosed.Also
theywantakeyswitchatmainfloor(1
st
)toenableitwhenthereisaconventionplanned.
Theydon’twantthatanybodyhas togoto enableanddisablethe5
th
flooreverydayaccordingthe
openinghoursofthemusicbar
Invertererror
P0005
P0005
Flipflop0
SET
RESET
RT000
OR
UL0
23h
0h
RT001
OR
UL1
1h
L0111
RT002
OR
UL2
RT000
RT001
Fl05COPdisable
NAND
UL3
RT002
RT002
Fl05LOPdisable
NAND
UL4
RT002
RT002
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