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Thinking about adding control to the vibe pump.
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Burner0000
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Joined: 28 Jul 2011
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Posted Thu Apr 3, 2014, 12:45pm
Subject: Thinking about adding control to the vibe pump.
 

I am thinking of attaching a variable speed switch to the vibe pump on my Silvia in order to profile pressure during espresso extraction.  I know that people have tried to use a simple switch attached to the plug I figured why not just hook it up to the pump directly?  Has anyone tried this?  I looked up the pump info and it only requires 120V/7W/0.5A which is only an 8th of the max capacity of any light dimmer switch off the shelf.   Once I get my hands on another multi meter I am gonna try this out.
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D4F
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Posted Thu Apr 3, 2014, 12:50pm
Subject: Re: Thinking about adding control to the vibe pump.
 

Several Gaggia users have tried dimmers wired to the pump.  It seems to work, but there is question as to the pump tolerance of the altered wave form.  Easy install noted here, and  possible pump problem mentioned toward the end.

http://www.gaggiausersgroup.com/index.php/topic,193.0.html

 
D4F also at
http://www.gaggiausersgroup.com/
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Burner0000
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Roaster: Behmor 1600 / Sonofresco
Posted Thu Apr 3, 2014, 12:54pm
Subject: Re: Thinking about adding control to the vibe pump.
 

D4F Said:

Several Gaggia users have tried dimmers wired to the pump.  It seems to work, but there is question as to the pump tolerance of the altered wave form.  Easy install noted here, and  possible pump problem mentioned toward the end.

http://www.gaggiausersgroup.com/index.php/topic,193.0.html

Posted April 3, 2014 link

I'll give it a read.  I found a switch with the same voltage and hertz for only $19.  If the Hertz match then wouldn't it eliminate that problem or do I need identical V/W/A/H?
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calblacksmith
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calblacksmith
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Posted Thu Apr 3, 2014, 1:18pm
Subject: Re: Thinking about adding control to the vibe pump.
 

Same or more.
The Expobar thermoblock machine I used for parts on my Sylvia rebuild used a frequency changing circuit on the pump, it kept the same voltage but slowed the frequency down so the pump ran slower. You may want to look into an electronic DIY circuit to vary the output CPS. Just adding a different way to do it to the conversation.

 
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Feed the newbs, starve the trolls and above all enjoy what you drink!
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JGG
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JGG
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Posted Thu Apr 3, 2014, 1:46pm
Subject: Re: Thinking about adding control to the vibe pump.
 

From the archives:
Click Here (coffeegeek.com)

This thread was about using a rheostat to dump voltage, but a dimmer switch option was also discussed.

The basic light dimmer switch worked fine.  Eventually I "upgraded" to a proportional control SSR with a potentiometer, which gave a tad finer control.  Never did any damage to the pump AFAIK.

Jim
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D4F
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Posted Thu Apr 3, 2014, 1:51pm
Subject: Re: Thinking about adding control to the vibe pump.
 

More here on page 9 and 10 including comments about waveform.

Click Here (coffeegeek.com)

 
D4F also at
http://www.gaggiausersgroup.com/
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jonr
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Posted Thu Apr 3, 2014, 2:36pm
Subject: Re: Thinking about adding control to the vibe pump.
 

Many people have been satisfied with a dimmer.   If you don't like it, then you can try something that should work a little better - like a variac or a computer + fast PWM control.  The latter can also give you much more repeatable results (it certainly does for me).
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CMIN
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Posted Thu Apr 3, 2014, 3:00pm
Subject: Re: Thinking about adding control to the vibe pump.
 

Didn't Bill Crossland post some info about profiling on a vibe pump either here or on HB, or was that someone else? Could swear it was him
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Burner0000
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Joined: 28 Jul 2011
Posts: 1,090
Location: Cambridge, Ontario Canada
Expertise: Professional

Espresso: Rancilio Silvia, VFA Expres...
Grinder: Macap MX/VFA N1464/Kyocera...
Drip: Manual Drip, French Press
Roaster: Behmor 1600 / Sonofresco
Posted Thu Apr 3, 2014, 3:02pm
Subject: Re: Thinking about adding control to the vibe pump.
 

Hmm. I'll see what I can dig up. I don't want to spend a lot on this mod because I plan to eventually upgrade. Global industrial sells all kinds of speed controllers and switches and I'm looking for something with a smooth adjustment. Not something that works like 0%.. 50%... 80%.. 100%.
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D4F
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Joined: 15 Mar 2012
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Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Apr 3, 2014, 3:03pm
Subject: Re: Thinking about adding control to the vibe pump.
 

Billc posted in the thread above page 9 and 10.

More by Billc at HB

Click Here (www.home-barista.com)

 
D4F also at
http://www.gaggiausersgroup.com/
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