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youngken
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How to Transiently Switch 2 Circuits in Opposite Phases at Same Time?

09/13/2010 1:54 AM

Both Circuit A & Circuit B are elctromagnetic devices.

I want to install an extra spring switch to control Both Circuit A & Circuit B. My intention is as follows:

I think I need to change both switchs in Circuit A & Circuit B as well.

Can anyone tell me how I can set up to such a circuit?

Thanks a lot!
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PWSlack
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#1

Re: How to transiently switch 2 circuits in opposite phrases at the same time

09/13/2010 2:30 AM

How about a normally-open pushbutton driving a double-pole changeover relay? Drive circuit A off one pole and circuit B off the other.

"Simples!ξ"

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youngken
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#3
In reply to #1

Re: How to transiently switch 2 circuits in opposite phrases at the same time

09/13/2010 4:14 AM

Just "shifting" key A & key B to the Key switch?
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JohnDG
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#2

Re: How to transiently switch 2 circuits in opposite phrases at the same time

09/13/2010 4:07 AM

... Or even a pushbutton with one NO and one NC contact block?

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PWSlack
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#4
In reply to #2

Re: How to transiently switch 2 circuits in opposite phrases at the same time

09/13/2010 8:49 AM

Yep. That would do it.

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Randall
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#9
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Re: How to transiently switch 2 circuits in opposite phrases at the same time

09/14/2010 5:01 AM

GA

Young Ken,

http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=1114209&k=momentary%20switch

In the column headed "circuit" highlight DPDT then click on "Apply Filters".

Make sure you meet the voltage/current requirements.

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Haajee
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#11
In reply to #2

Re: How to transiently switch 2 circuits in opposite phrases at the same time

09/14/2010 10:23 AM

Or

SPDT =Single pole double throw toggle switch
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JohnDG
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#12
In reply to #11

Re: How to transiently switch 2 circuits in opposite phrases at the same time

09/14/2010 10:29 AM

With two separate circuits you'd need double pole switching.

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Anonymous Poster
#5

Re: How to Transiently Switch 2 Circuits in Opposite Phases at Same Time?

09/13/2010 1:08 PM

In India we suffered from large voltage fluctuation in past and a genius find a solution for that. Yes try open a V-guard stabiliser you will find the relay contacts very close.
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Shyam
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#6

Re: How to Transiently Switch 2 Circuits in Opposite Phases at Same Time?

09/13/2010 11:18 PM

You need to define "same time" clearly. Is it in seconds, milli seconds, micro seconds or nano seconds that you want to switch two signals together?

Sequence for reduced time will be

Tactile manual switch - 100ms to 1s

Electromechanical relay 1ms to 100ms

Solid state relay 1us to 1ms

Fast MOSFET relay 1ns to 1ms

Both switching current and switching time along with synchronization time to be clearly stated.

============= I am ready to help anyone who is not smart enough. Shyam

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Anonymous Poster
#7
In reply to #6

Re: How to Transiently Switch 2 Circuits in Opposite Phases at Same Time?

09/14/2010 2:14 AM

I am not ready to help anyone who consider himself smart enough.
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JohnDG
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#8
In reply to #6

Re: How to Transiently Switch 2 Circuits in Opposite Phases at Same Time?

09/14/2010 3:23 AM

The OP states that the circuits being controlled are "electromechanical", so it's very unlikely that the synchronization would need to be faster than, say, 10 to 100ms.

A pushbutton (especially if fitted with a snap-action mechanism) could easily achieve this. A biased double pole toggle switch (on-(on) action) would also do the job.

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Shyam
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#10
In reply to #8

Re: How to Transiently Switch 2 Circuits in Opposite Phases at Same Time?

09/14/2010 9:02 AM

Yes, the figure shows two switches single polse single through one NO and one NC type switch.

Commonly used PLCs will activate relay contacts in 1ms and PLC operates all relays in parallel by latching relay control almost within few microseconds jitter. Some PLC may be poorly designed so one need to read the manual properly on how relays are operated. In theory, they should operate together for all outputs.

It all depends on what person really want to do out of such contacts.

If such contacts are changing power to critical instrument then watch out for power breaking time.

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Anonymous Poster
#13

Re: How to Transiently Switch 2 Circuits in Opposite Phases at Same Time?

09/14/2010 10:42 PM
  • you should to choose two contactor with inter locking lever at the same time with NO NC contact,

and you needed limit switches also available in market.you can use it.
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Anonymous Poster (3); Haajee (1); JohnDG (3); PWSlack (2); Randall (1); Shyam (2); youngken (1)

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