An relay issue! Please help me!

1533 Views 15 Replies 5 Participants Last post by leocorona, Feb 6, 2013

leocorona

Discussion Starter · Dec 21, 2012

4

Hello mates!

I've recently found this forum and I'm pretty sure I'm in the right place to ask my question.

I'm on my new project, a VACUUM SEALING MACHINE, actually one like this :

So, I've got some clue on how this thing works and I bought some devices to put this thing on:

A Vacuum pump:

To vacuum the all the air out(got one from an old tire compressor)

Vacuum sensor Switch:

An circuit open Switch sensor, it closes when the sensor reaches the preset pressure

Heater element:

To seal the bag

So, I had a chat with an specialist and I've been told to use RELAYS.
So I thinking of use two relays, one to receive the signal from the Sensor and switch the pump off and another one that's activated afterwards the first relay, so it can turn the heater on for at least 5 sec.

Have I made myself clear?
I've got some videos so you guys can check this thing out:
http://www.youtube.com/watch?v=r9dzaeC0hG0

Does anyone have any idea which RELAY i should use, and if it's really possible to do it so?

Cheers!

Leonardo Corona.

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1 - 16 of 16 Posts

dmxtothemax

· #2 · Dec 21, 2012

Do you know how much current the pump draws ?

leocorona

Discussion Starter · #3 · Dec 22, 2012

dmxtothemax said:
Do you know how much current the pump draws ?

The pumps is 12v, 60w and I reckon around 4Amps. I'm not sure abou the amps, as it doensn't got any labes on it.

leocorona

Discussion Starter · #4 · Dec 22, 2012

Hi mate, I just checked this website and I'm quite sure it's the same pump, there is some technical parameters about the pump:
http://www.alibaba.com/product-gs/562309213/Automatic_12v_air_tyre_pump_motor.html

dmxtothemax

· #5 · Dec 22, 2012

leocorona said:
The pumps is 12v, 60w and I reckon around 4Amps. I'm not sure abou the amps, as it doensn't got any labes on it.

60w / 12v = 5 amps.

Any type of automotive relay rated at 10 amps would do well !

dmxtothemax

· #6 · Dec 22, 2012 (Edited)

leocorona said:
Hi mate, I just checked this website and I'm quite sure it's the same pump, there is some technical parameters about the pump:
http://www.alibaba.com/product-gs/562309213/Automatic_12v_air_tyre_pump_motor.html

The picture says its a 12v,
But the spec's say its rated 12 - 230v.
I think at 12v it would pull a lot of current > 200w !
Overkill !

redman88

· #7 · Dec 22, 2012

grrrr, i want to find the parts and draw this out for you but i am to tired. one main problem is the converting the power from 120 vac to 12 vdc for the compressor, and i don't know if that compressor and vacuum the way you want.

Reactions: 1

leocorona

Discussion Starter · #8 · Dec 22, 2012

Gggrrr! I've made some tests and I think it would do great, But the problem is manly the AC/DC conversion... And also the Relays! I had a look at the original Vacuum Sealing Machine, and the AC/DC seems a bit big to be honest, so I reckon this AC/DC I'm gonna use need to be powerful(200w).

leocorona

Discussion Starter · #9 · Dec 22, 2012

I'm not sure about this 200w, it says "Max torque point", But I'm don't need extreme vacuum, I'd reach the breaking point, as it would damage the sensor and the pump as well.

Dave632

· #10 · Dec 22, 2012

leocorona said:
Gggrrr! I've made some tests and I think it would do great, But the problem is manly the AC/DC conversion... And also the Relays! I had a look at the original Vacuum Sealing Machine, and the AC/DC seems a bit big to be honest, so I reckon this AC/DC I'm gonna use need to be powerful(200w).

You can pick up a 20Amp 12V DC Power Supply relatively inexpensively at Radio Shack. Or search electronics sites for plans on how to build one yourself.

leocorona

Discussion Starter · #11 · Dec 22, 2012

That's a good idea, I just found on Ebay and it's something around $20. I think it's pretty cheap actually! First issue solved, now I need some ideas on which relay I'm going to use!

leocorona

Discussion Starter · #12 · Feb 1, 2013

redman88 said:
grrrr, i want to find the parts and draw this out for you but i am to tired. one main problem is the converting the power from 120 vac to 12 vdc for the compressor, and i don't know if that compressor and vacuum the way you want.

Hi mate!

I'd like to know if you can help me with my project, the vacuum machine. I tried to find some help but no one could figure out it for me, would you help me?
I'd be glad!!!:thumbup:
Cheers!

64pvolvo1800

· #13 · Feb 1, 2013

leocorona said:
Hi mate!

I'd like to know if you can help me with my project, the vacuum machine. I tried to find some help but no one could figure out it for me, would you help me?
I'd be glad!!!:thumbup:
Cheers!

What exactly are you going to use for power? A ten amp relay will be plenty but the coil voltage is the critical need to draw a circuit for you. Are you putting a battery in your kitchen? Using a power supply? Sealing bags in your car? Operating a mobile leftover food vacuum packing business?

leocorona

Discussion Starter · #14 · Feb 1, 2013

Hi mate!
I've just solve the pump issue, I've made some changes and I got a 110v AC motor, so I will no longer need the DC motor.
Now the issue is only about the Relays...Do you know what relays fits on this application? As I said beforehand, I just need to shut the pump off when it reaches the pre set vacuum point and if possible turns the sealer on for about 5 secs.
Have a look at the vacuum switch website:

http://www.vaccon.com/Switch-SX-home.aspx

If you have any idea, just let me know!!

Cheers!

64pvolvo1800

· #15 · Feb 1, 2013

leocorona said:
Hi mate!
I've just solve the pump issue, I've made some changes and I got a 110v AC motor, so I will no longer need the DC motor.
Now the issue is only about the Relays...Do you know what relays fits on this application? As I said beforehand, I just need to shut the pump off when it reaches the pre set vacuum point and if possible turns the sealer on for about 5 secs.
Have a look at the vacuum switch website:

http://www.vaccon.com/Switch-SX-home.aspx

If you have any idea, just let me know!!

Cheers!

Now it is critical to know the hp and amps of the motor.
A relay from grainger will do th job but you need to mount it in a box.

leocorona

Discussion Starter · #16 · Feb 6, 2013

I got the pump running now with a 127v / 200w AC motor, have you got any idea which relay I could use?

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