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Varadharaju
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Join Date: Apr 2009
Posts: 14

How to Build a Circuit as Explained Below?

04/21/2009 4:05 AM

Hi,

This is Varadharaju basically a Mechanical Engineer. I have designed an domestic equipment, This equipment needs to be operated by an electrical/electronic usage. I have explained below in detail the concept how electrical portion should function .Please refer to it & help in building this electric circuit.

Functional concept/Requirement.

Step 1---->Switching on 220 volts current (normally used in Indian homes)

Step 2---->Electric immersion heater must switch on & stay for 10-12 mins(timer should be adjustable) ( Heater is a general one which we use at homes to boil water by immersing into a bucket of water)

Step 3---->Immediately after 10-12 mins keeping the heater still switched on it should trigger a 1/4 hp motor "A" to switch on & keep the motor running for 15mins(timer should be adjustable).

Step 4----> After 15 mins the motor "A" & heater must be switched off & trigger to switch on motor- "B". (NOTE : Motor B is connected to a screw rod which converts rotary motion of the screw rod to linear motion)

Step 5----> Motor "B" should rotate for clockwise for 2 minutes very slowly at less than 25 rpm. After 2mins the same motor should rotate anticlockwise. & all motors should be switched off & buzzer should on to indicate cycle completion.

I appreciate if somebody could help me in building this circuit.
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Simon Wan
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Join Date: Apr 2007
Posts: 577
Good Answers: 10
#1

Re: How to build a circuit as explained below?

04/21/2009 4:24 AM

It is a very easy electrical circuit to design. What it is for...

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Varadharaju
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Join Date: Apr 2009
Posts: 14
#3
In reply to #1

Re: How to build a circuit as explained below?

04/21/2009 7:16 AM

This is for one of the domestic equipment which i am inventing to operate in a pharmaceutical industry.

If you feel it easy your support & cooperation is appreciated.
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Simon Wan
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#5
In reply to #3

Re: How to build a circuit as explained below?

04/21/2009 10:04 PM

I have design the electrical circuit and you can try it out. It will works as it is design.

Step 1. Switch "ON" the toggle switch

Step 2. Press the Push Button.The contactor KM1 will energize and closing the KM1-1 contact point. Thus, the supply is via the KM1-1 contact point to the KM1 contactor coil and keep energize the KM contactor. At the same time, Timer 1 start counting and the Heater is also switch "ON" by KM1-2 contact (make sure this is a power contact point for heater)

When the timer T1 time is up, the timer contact T1 will close and energize KM2 contactor. Your motor "A" will start to operate and it also started the timer T2 to start counting. Once the T2 time is up, the contact of the timer T2 will close and it will energize KM3.

When contactor KM3 energize and closing the KM3-2 contact point, the supply is via the KM3-2 contact point to the KM3 contactor coil and keep energize the KM3 contactor. This your motor "B" will be running clockwise direction. Timer T3 will start counting for the next step.

The other contact point of KM3-1 will open circuit and stop the heater and the motor "A" operation

Once the timer T3 time is up, the timer contact T3 will close and energize KM4 contactor. Your motor "B" will start to operate in anticlockwise direction and it also started the timer T4, to start counting. The other contact point of KM4-1 will de-energize the KM3 contactor

Once the T4 time is up, the contact of the timer T4 will close and it will energize R1 (Cycle complete relay) and the buzzer will switch "on" The buzzer will keep sound until you switch off the toggle switch.

Just let me know if you need more information

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Varadharaju
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Join Date: Apr 2009
Posts: 14
#8
In reply to #5

Re: How to build a circuit as explained below?

04/22/2009 12:45 AM

Hi Mr.Simon,

I appreciate & thank you for your support. I will try to follow your suggest method for prototype build. Can you guide approximately what could be the cost of such an circuit.

One more thought is , is there anyway to make it simple by using PLC with displays etc., if yes request you to explain me about that also & approximate cost for building it.

Thanks & have a good day.
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Simon Wan
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#10
In reply to #8

Re: How to build a circuit as explained below?

04/22/2009 4:53 AM

I guess it will cost about few hundred ringgit Malaysia. Since your motor watt is small, you can use small size contactor and the cost will be cheaper, excepts the timer may be slightly expensive.

I not sure if you are using 3 phase motor or a single phase motor. If you like I can draw you the full power circuit to go with it.

PLC is good but don't forget that you need to have the programmer to program your PLC. Some of the license programming software is quite expensive.

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BOND
Participant

Join Date: Apr 2009
Posts: 1
#12
In reply to #10

Re: How to build a circuit as explained below?

04/22/2009 5:20 AM

Hi Simon,

Thanks for the reply. I request you to help me in selecting a suitable motor also. The purpose of Motor"A" is to rotate a mixing chamber by a belt drive. The weight of mixing Chamber inclusive of the contents inside is max 7kg. WHAT CAPACITY/TYPE OF MOTOR SHOULD I SELECT??

The purpose of motor"B" is connected to a screw rod so when motor rotates screw rod rotates & helps in moving the piston up & down. WHAT CAPACITY/TYPE OF MOTOR SHOULD I SELECT??

OR

Is there any idea to to achieve both the purpose using a single motor.

It would be of great help me if you draw the complete full power circuit.

Simon, which part of Malaysia you are from. I stayed in Kaula Lumpur for nearly 4years.

Have a great time.
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Varadharaju
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Join Date: Apr 2009
Posts: 14
#13
In reply to #10

Re: How to build a circuit as explained below?

04/22/2009 5:22 AM

Hi Simon,

Thanks for the reply. I request you to help me in selecting a suitable motor also. The purpose of Motor"A" is to rotate a mixing chamber by a belt drive. The weight of mixing Chamber inclusive of the contents inside is max 7kg. WHAT CAPACITY/TYPE OF MOTOR SHOULD I SELECT??

The purpose of motor"B" is connected to a screw rod so when motor rotates screw rod rotates & helps in moving the piston up & down. WHAT CAPACITY/TYPE OF MOTOR SHOULD I SELECT??

OR

Is there any idea to to achieve both the purpose using a single motor.

It would be of great help me if you draw the complete full power circuit.

Simon, which part of Malaysia you are from. I stayed in Kaula Lumpur for nearly 4years.

Have a great time.
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Simon Wan
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#14
In reply to #13

Re: How to build a circuit as explained below?

04/24/2009 12:28 AM

Hi, Varadharaju

Sorry, I am not able to help you to select the motor for your project as I am not a mechanical person. I think it need some calculation and some safety factors to size the motor for you. What you can do is to get some help from the motor suppliers where, they can recommended the type of motor for your projects.

Anyway, here is the full power circuit for your reference. This circuit is for 3 phase system.

In the last circuit, I forget to add in the Overload for the protection of the motor.

Sizing for the MCB 1, will be the total Amps of the MCB 2 and MCB 3 with the addition of 40% of the total amps or close to the next value available in the market.

MCB 2 and MCB 3, you need to resize it, according to the motor full load specification as in the motor name plate by addition some allowance of 30%. For example, IF your motor name plate is 1.2 amps, you have to select 2 Amp MCB rating or 3 Amp MBC rating.

Your overload, sizing will be the motor rated amp. If your motor rated amp is 1.2 Amps, you have to buy the overload with the scale of 1.0 amps to 1.5 amps. Setting of the overload, will be 1.2 Amps. If your motor current is over the overload setting of 1.2 amps, the overload will trip and thus, it protect your motor winding to breakdown.

At right now I am staying in Penang, a small state in the north of Malaysia.

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uathavia
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Join Date: Jun 2008
Location: dubai
Posts: 8
#9
In reply to #5

Re: How to build a circuit as explained below?

04/22/2009 3:01 AM

Dear Simon Wan,

The circuit diagram is not very clear. The print is too small. I too am a mechanical engineer and am interested in knowing more about the electric circuitry.

If possible can you send the circuit diagram by email to vinod@pmdubai.com

we all appreciate your response and help us in the process
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PWSlack
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#2

Re: How to build a circuit as explained below?

04/21/2009 4:30 AM

Check out some electrical and electronic suppliers for a "cam timer". These are simple motor-driven devices that rotate a cylinder onto which are attached some adjustable cams. As the cylinder rotates, the cams cause switches to open and close as they pass them.

Correct "programming" of the cam positions can give the functions above, and the rest is basic electrical wiring. Often the programming is carried out using a tool as simple as a hexagon key ("Allen key").

Cam timers were used in the earliest incarnations of automatic washing machines.

Nice simple low-tech solution.

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frankd20
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#4

Re: How to Build a Circuit as Explained Below?

04/21/2009 11:36 AM

This could be accomplished quite easily with a PIC chip some relays and just a few other components.

I imagine a bunch of time delay relays could also be configured to do something like this.
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gsuhas
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#6

Re: How to Build a Circuit as Explained Below?

04/21/2009 11:47 PM

I suggest some (costly) solution: Use PLC
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kayems
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Join Date: Jun 2008
Posts: 24
#7

Re: How to Build a Circuit as Explained Below?

04/22/2009 12:18 AM

sequential timers could also be programmed for the application.

similar to this: http://www.eaplindia.com/indexnew11productsS1.html
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rudy.leurs
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#11

Re: How to Build a Circuit as Explained Below?

04/22/2009 5:08 AM

Why not using a LOGO! for this purpose.

It is small (1 dm3), cheap (+/- 200 EUR), it has 4 output contacts 10Amp , and it has a display to show timings.

It has 8 inputs for push button switches or end switches.
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Users who posted comments:

BOND (1); frankd20 (1); gsuhas (1); kayems (1); PWSlack (1); rudy.leurs (1); Simon Wan (4); uathavia (1); Varadharaju (3)

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