How can i start a different pump at each start ?

[Furamuki]

So I have 2 pumps, when i turn a selector on i want to start the first pump.
Once the selector was turned off and on again, I want to start the second pump.
And any time i repeat it i have to turn on the other pump which was not running on the previous startup.
How can i do this whitout a PLC ?

 

[LeeH]

Smart relays are easy enough with drag and drop logic/function blocks and cheap. Basically a mechanical mini PLC.

What’s wrong with 2 interlocked switches?

 

[Furamuki]

Thank you for your response.
Could you give me an exemple for a smart relay which can do that?
Because basically I also thought that, but I could not find relays like that

 

[Furamuki]

Smart relays are easy enough with drag and drop logic/function blocks and cheap. Basically a mechanical mini PLC.

What’s wrong with 2 interlocked switches?

In the case of 2 interlocked switches, there exists the possibility that the operator starts the wrong pump.

 

[Avo Mk8]

Any interest?

https://library.e.abb.com/public/c39dba11d4ff4b52bfdfd7cc492828a3/1SAC200133W0001_A_CT-PAC_flyer.pdf

https://new.abb.com/products/1SVR508180R0100/ct-pac-22

Or just Google "Alternating relay"

 

[Furamuki]

Any interest?

https://library.e.abb.com/public/c39dba11d4ff4b52bfdfd7cc492828a3/1SAC200133W0001_A_CT-PAC_flyer.pdf

https://new.abb.com/products/1SVR508180R0100/ct-pac-22

Or just Google "Alternating relay"

Thank you very much, this is exactly what I need

 

[ElectroChem]

Any interest?

https://library.e.abb.com/public/c39dba11d4ff4b52bfdfd7cc492828a3/1SAC200133W0001_A_CT-PAC_flyer.pdf

https://new.abb.com/products/1SVR508180R0100/ct-pac-22

Or just Google "Alternating relay"

Now that's a useful bit of kit. I was trying to design a relay flip-flop in my head.