Thermal Programmable
Posted in Uncategorized on 08/06/2007 04:04 pm by adminA look at what is currently available on eBay
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anyone here who is expert or knowledgeable about PLC stuff?
i got this assignment in my plc(programmable logic controller). i dont know how to do it. anyone here who can answer it for me... i just started taking up the class a week ago. here is the question...
a motor is to be started using a start push button and stop using a separate button. three lamps will be used to monitor the status of the motor. a thermal overload relay is also added to provide motor protection.
can anyone send me the circuit diagram for this question...
thanks!
there are 2 languages in plc: Ladder [american] or grafcet[europe]
I think you're talking about Ladder language I can draw the diagram for you.
we have:
-pushbotton PB1 on
-pushbotton PB2 off
-green Lamp L1 shows motor is off
-yellow Lamp L2 shows motor is on
-Red Lamp L3 shows motor is overheated
-pushbutton PBH closes when circuit is overheated and opens when circuit is not overheated
-Motor M
we need the relays:
Relay1: R1 and its bobine RB1 for pushbutton status
Relay2: R2 and its bobine RB2 for motor circuit feeding
Relay3: R3 and its bobine RB3 for Lamp1 circuit feeding
Relay4: R4 and its bobine RB4 for Lamp2 circuit feeding
Relay5: R5 and its bobine RB5 for Lamp3 circuit feeding
the circuit would be:
|--PB1+ RB1- RB4- RB3*-RB5*-PBH*-RB2-|
|----R1+
|-PB2-RB1*-RB4*-RB3-RB5*-RB2*|
|--PBH-RB3*-RB4*-RB5--|
|--R3-L1--|
|--R4-L2--|
|--R5-L3--|
|--R1-M--|
* indicates: inverse
any question add me on msn: deltamc2
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