Homemade alternative to backpack.

[jimmyboots]

Thank you. So how do you suggest to wire it then

 

[PTWC]

Looking the picture of your pump jimmyboots, i see your issue.

The cables are molded into the top of the pump casing.

There will just be a joint in there, but it is hidden.

 

[jimmyboots]

there are 2 spade connections in the end (pressure switch end).. So how should you wire the relay?

 

[PTWC]

I think it should be like this, if you want the relay to switch the pump on and off

Should be like this:

30 DC power+ from after the flow controller

85 solenoid neutral

Live from flow control to pressure switch in (could join to pin 30)

Pressure switch out to 86 solenoid live

87 live out to pump

 

[jimmyboots]

does not the 87 in from the live to pressure switch, then 86 out to pressure switch activate the relay as the live going to the switch is cut by te relay so the relay gets activated.? Thats how I see it

 

[PTWC]

When you energise the coil (86 + and 85 -) in the relay by applying power to pin 86, then the switch contacts (30 and 87) are joined together ( switch on)

So, If you put permanent power to pin 30 from after the flow controller in this case, then when the relay is activated it sends the power out of pin 87 to the pump.

This will mean that the current drawn from the pump when switching on, will go through the relay contacts and not through the pressure switch.

The pressure switch will only have control current going through it, thereby prolonging the lifespan of it.

I think thats what you want to do isn't it?

Of course im probably wrong.

 

[jimmyboots]

I think it should be like this, if you want the relay to switch the pump on and off
Should be like this:

30 DC power+ from after the flow controller

85 solenoid neutral

Live from flow control to pressure switch in (could join to pin 30)

Pressure switch out to 86 solenoid live

87 live out to pump

**** the bed mate. My head hurts now. Isnt this what I have done in the diagram. /emoticons/biggrin.png If not you'll have to draw a diagram tomorrow. Or are you saying I have 86 and 87 the wrong way round ??

Why can I hear the relay click too ?

 

[PTWC]

Yeah its late now,

Hard to work out what your connections are doing on that pump.

If you took the pressure switch out the pump would not turn off at high pressure, so hence the pressure switch can have the job of disconnecting the pump.

Therefore, if the pressure switch could turn the relay off instead, then bingo, the relay could take the strain and save the contacts on the pressure switch.

I think thats what you want isnt it.

It needs drawing out. Too many variables.

 

[jimmyboots]

Yes, it is mate. If it is doing it that's fine, but if the pressure switch on the pump has been taking all the strain for all this time, then maybe they are more hardy than I thought and don't need protecting. The pumps are about £13.50 on ebay. If they can last more than a year then they are worth their money. :thumbsup:

 

[PTWC]

My diagram

View attachment 3239

 

[PTWC]

Sorry the pic is sideways

 

[timbeam]

Lol guys.

Like I said, I don't use a relay and my pump still works just fine. The relay seems to just over complicate things.

 

[PTWC]

Yes timbeam your right, but while we were talking about it I had to work it out. Bit ocd I know, can't help it. :specs:thumbsdown:

 

[jimmyboots]

My diagramView attachment 5186

Sideways is good /emoticons/smile.png So the 2 wires running up the pump to the pressure switch dont need to be touched and you run 2 more from the switch connections to 86 and the other before the relay?

 

[jimmyboots]

Lol guys.
Like I said, I don't use a relay and my pump still works just fine. The relay seems to just over complicate things.

Actually, the funny thing is that the box I made in this thread. I never bothered wiring a relay in it.

 

[WWC]

Lol guys.
Like I said, I don't use a relay and my pump still works just fine. The relay seems to just over complicate things.

Yeah it will work just fine without one, just like many pump boxes including 2 that I have - 1 home made and 1 bought. But…

(1) It is there to add protection to the pressure switch, which will burn out eventually with constant use. So, will the relay, but a relay is easier and cheaper to replace.

(2) This is a useful and constructive conversation, especially in the DIY part of the forum. It helps us all to understand better what we are making and why. Adding a relay isn't basic DIY, well not for non-electronic engineer type people anyway.

(3) It helps people further develop their skills and allow them to make more advanced kit at home if they are interested.

Thanks for this discussion guys, you are helping me understand it better [emoji106]

 

[timbeam]

Yeah it will work just fine without one, just like many pump boxes including 2 that I have - 1 home made and 1 bought. But…
(1) It is there to add protection to the pressure switch, which will burn out eventually with constant use. So, will the relay, but a relay is easier and cheaper to replace.

(2) This is a useful and constructive conversation, especially in the DIY part of the forum. It helps us all to understand better what we are making and why. Adding a relay isn't basic DIY, well not for non-electronic engineer type people anyway.

(3) It helps people further develop their skills and allow them to make more advanced kit at home if they are interested.

Thanks for this discussion guys, you are helping me understand it better [emoji106]

Lol, I'll consider myself told off then.

If you'd read my post above you'll see I agree that having a relay is a good idea and I too appreciate all the advice.

All I was trying to say was don't stress over it.

 

[WWC]

Lol, I'll consider myself told off then.
If you'd read my post above you'll see I agree that having a relay is a good idea and I too appreciate all the advice.

All I was trying to say was don't stress over it.

One of the problems of an online forum is that all we have to communicate is typed words and real life communication is so much more than words... Sorry if I came across as 'telling you off' it wasn't meant as such.

I was sort of answering you and anyone else with the same unspoken question. Maybe, I answered too early in the morning for me to be safe talking with other people in a reasonable manner [emoji56]

 

[PTWC]

Sideways is good /emoticons/smile.png So the 2 wires running up the pump to the pressure switch dont need to be touched and you run 2 more from the switch connections to 86 and the other before the relay?

ermm, no I don't think so.

see the diagram indicates putting the pressure switch into the circuit, but in a different way.

The idea is that the relay contacts act as the switch for the pump, but the relay switch is controlled via its own solenoid to activate itself, and this solenoid coil is energised by the pressure switch turning it on.

The way you had it, it was not doing anything.

(I'm rubbish at explaining it, but study the diagram, it describes it better than me) /emoticons/wink.png

I sincerely hope this does help. /emoticons/smile.png

 

[timbeam]

One of the problems of an online forum is that all we have to communicate is typed words and real life communication is so much more than words... Sorry if I came across as 'telling you off' it wasn't meant as such.
I was sort of answering you and anyone else with the same unspoken question. Maybe, I answered too early in the morning for me to be safe talking with other people in a reasonable manner [emoji56]

Don't worry mate, I'm not so easily offended.

 

[timbeam]

Actually found a decent video that explains it well & your drawing is spot on PTWC. Well done mate.

[media]

[/media]
It's all worth a watch but the practical hook up starts at 6 mins.