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Old 12-21-2012, 06:41 PM   #1
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An relay issue! Please help me!




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:


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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Old 12-21-2012, 06:53 PM   #2
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An relay issue! Please help me!


Do you know how much current the pump draws ?

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Old 12-21-2012, 07:01 PM   #3
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Quote:
Originally Posted by dmxtothemax View Post
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.
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Old 12-21-2012, 07:05 PM   #4
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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/56...ump_motor.html
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Old 12-22-2012, 12:12 AM   #5
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Quote:
Originally Posted by leocorona View Post
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 !
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Old 12-22-2012, 12:13 AM   #6
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An relay issue! Please help me!


Quote:
Originally Posted by leocorona View Post
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/56...ump_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 !

Last edited by dmxtothemax; 12-22-2012 at 12:16 AM.
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Old 12-22-2012, 12:16 AM   #7
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An relay issue! Please help me!


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.
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Old 12-22-2012, 10:15 AM   #8
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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).
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Old 12-22-2012, 10:19 AM   #9
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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.
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Old 12-22-2012, 10:36 AM   #10
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An relay issue! Please help me!


Quote:
Originally Posted by leocorona View Post
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.
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Old 12-22-2012, 10:45 AM   #11
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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!
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Old 01-31-2013, 10:33 PM   #12
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Quote:
Originally Posted by redman88 View Post
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!!!
Cheers!
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Old 02-01-2013, 05:34 AM   #13
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An relay issue! Please help me!


Quote:
Originally Posted by leocorona View Post
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!!!
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?
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Old 02-01-2013, 07:04 AM   #14
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An relay issue! Please help me!


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:



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

Cheers!
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Old 02-01-2013, 01:25 PM   #15
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An relay issue! Please help me!


Quote:
Originally Posted by leocorona View Post
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:



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.

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