Motor control circuit

Jacob1995 · Dec 27, 2017

Hey guys just wondering if anyone can help me draw up a circuit diagram for this, would really appreciate the help.
Need to draw a control circuit that consists of:
1. A motor to be started and continue running in forward direction by momentarily pressing push buttom SW1.
2. The same motor to be started and continue running in reverse direction by momentarily pressing push button SW2.
3. Pressing push button SW3 will stop the motor regardless of direction.
4. A thermal overload will also stop the motor regardless of direction.
5. When motor isnt rotating but the circuit is energised, a red led will illuminate.
6. When motor is rotating in forward direction, a white led will illuminate.
7. When motor is rotating in reverse direction, a blue led will illuminate.
8. Only 1 led is to be on at a time.
9. Once running, pressing the other direction push button will not cause the motor to change direction or damage the circuit.
10. Operation of rotary switch SW4 will allow SW1 to be used as a jog push button in forward only.

Pete999 · Dec 27, 2017

Jacob1995 said:
Hey guys just wondering if anyone can help me draw up a circuit diagram for this, would really appreciate the help.
Need to draw a control circuit that consists of:
1. A motor to be started and continue running in forward direction by momentarily pressing push buttom SW1.
2. The same motor to be started and continue running in reverse direction by momentarily pressing push button SW2.
3. Pressing push button SW3 will stop the motor regardless of direction.
4. A thermal overload will also stop the motor regardless of direction.
5. When motor isnt rotating but the circuit is energised, a red led will illuminate.
6. When motor is rotating in forward direction, a white led will illuminate.
7. When motor is rotating in reverse direction, a blue led will illuminate.
8. Only 1 led is to be on at a time.
9. Once running, pressing the other direction push button will not cause the motor to change direction or damage the circuit.
10. Operation of rotary switch SW4 will allow SW1 to be used as a jog push button in forward only.

Basic wiring for motor control - Technical data guide | EEP - http://electrical-engineering-portal.com/download-center/books-and-guides/electrical-engineering/basic-wiring-for-motor-control
AC Motor Control Circuits | AC Electric Circuits Worksheets - https://www.allaboutcircuits.com/worksheets/ac-motor-control-circuits/
http://www.industry.usa.siemens.com...Documents/Control_Circuit_Schematics_0507.pdf

You will of course need to add wiring for
the indicators, and add a second contactor to allow for reversing purposes, shouldn't be to difficult to work out
Reversing+a+three+phse+motor - - Yahoo Image Search Results - https://images.search.yahoo.com/yhs/search;_ylt=A0LEVjzbOENam6MAjF0nnIlQ;_ylu=X3oDMTEyMHJxZmlpBGNvbG8DYmYxBHBvcwMxBHZ0aWQDQjQ3NzZfMQRzZWMDc2M-?p=Reversing%2Ba%2Bthree%2Bphse%2Bmotor&fr=yhs-mozilla-102&hspart=mozilla&hsimp=yhs-102

marconi · Dec 27, 2017

Re post #1:

a. does there need to be a time delay which disables some or all of the control switches after pressing 'Stop' to allow the motor to come to rest?

b. your (9) covers when motor is in Run mode. In Jogging mode is SW2 to be disabled when SW4 selects SW1? (SW4 selects Run or Jog Forward modes).

c. do the pushes SW1, SW2 and SW3 and switch SW4 need illuminating to show when they are enabled?

d. In the event of a thermal overload what state does the controller have to enter? What must happen to leave this state?

e. You have described the operational function of the Stop button. What about separate permanent hard-wired functionality which stops/prevents start of the motor for safety reasons? What must happen when this functionality initiates stop?

ElectroChem · Dec 27, 2017

marconi said:
Re post #1:

I think you're reading too much into this one Marconi. The OP is almost word for word a question from my motor controls coursework, quite clearly being farmed out for answers.

Spoon · Dec 27, 2017

Hi OP. Welcome to the forum.
How about you drawing up how you think it should work and we can correct or add to it.
You will learn a lot more that way, rather than us just giving you the diagram.

telectrix · Dec 27, 2017

here you go:

[ElectriciansForums.net] Motor control circuit

Spoon · Dec 27, 2017

telectrix said:
here you go:

Is that you Tel???

marconi · Dec 27, 2017

ElectroChem said:
I think you're reading too much into this one Marconi. The OP is almost word for word a question from my motor controls coursework, quite clearly being farmed out for answers.

Thank you for the 'heads up'. I thought it was a real-life application.

Merry Christmas to you.

Rocboni · Dec 27, 2017

White and blue panel indicators should not be used for the forward or reverse motor running indicators, they should be green.

Blue = Reset/Standby/Mandatory operation by operator required and White = power/control on.

Jacob1995 · Dec 31, 2017

Spoon said:
Hi OP. Welcome to the forum.
How about you drawing up how you think it should work and we can correct or add to it.
You will learn a lot more that way, rather than us just giving you the diagram.

Cheers spoon, heres how i think it should be, only needs control connections though no power so doesnt have to show how motor would change into reverse. How do you think i went?

Jacob1995 · Dec 31, 2017

Rocboni · Dec 31, 2017

Looks ok, you don't need N/C contacts for the indicator run lights, they can only be on when the C1 or C2 are on and they are interlocked so they can't be on at the same time anyway.

Whats the rectangle at the start?

Normally the red light would be triggered by the overload but you've not been asked to do that, it's a pretty crap question to be honest.

Spoon · Dec 31, 2017

Rocboni said:
Whats the rectangle at the start?

I'm presuming that's a fuse.

Spoon · Dec 31, 2017

How are you latching C2 mate?

Rocboni · Dec 31, 2017

Missed that C2 needs a hold in.

Motor control circuit

Jacob1995

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Pete999

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marconi

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ElectroChem

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Spoon

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telectrix

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Spoon

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marconi

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Rocboni

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Jacob1995

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Jacob1995

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Rocboni

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Spoon

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Spoon

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Rocboni

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