The solenoid valve chase, after Parker H3L - Page 4
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Old 01-18-2013, 07:11 AM   #46
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The trick is not the ma but using a switch mode power supply and not a transformer. The switch mode will put out the same voltage no matter where it is plugged in vs a transformer which will vary a little.
you got me worry a little bit, I tried different 24V DC power supply on the 2822 solenoid last week, and finally, see no over heat because all adapters are switch mode type, there are always circuit boards in those adapters, I think the output current were adjusted.

BTW, I also tested the 24V AC(60Hz) Burkert 6011 solenoids. I remember on a .pdf spec sheet of a different brand of solenoid, the 24V DC power supply does work on a 24V AC(60Hz), but the actual power consumption is much higher.
This is what I did, tested two Burkert 6011, 24V 60Hz on a 24V 60Hz power supply, the solenoid is warm as those Burkert 6011, 24V DC version, but switched to several 24V DC power supply on the 60Hz model, the solenoidfs were "BURNING HOT".
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Old 01-18-2013, 08:10 AM   #47
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This is what I did, tested two Burkert 6011, 24V 60Hz on a 24V 60Hz power supply, the solenoid is warm as those Burkert 6011, 24V DC version, but switched to several 24V DC power supply on the 60Hz model, the solenoidfs were "BURNING HOT".
So moral of the story is if you have an AC solenoid, use an AC power supply
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Old 01-18-2013, 10:07 AM   #48
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So moral of the story is if you have an AC solenoid, use an AC power supply
+1, 24V AC(60Hz) output power adapter is really, really hard to find.
only have one on hand, found it at thrift store more than a year ago, still looking for more because not only the AC input Burkert 6011, also have several more 24V AC(60Hz) stainless steel Numatics low power consumption solenoids that I got back in when I started the metering valve selection thread.
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Old 01-18-2013, 02:16 PM   #49
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Any of these do the job for you?

This seems perfect for the super custom stuff you guys are doing, just the transformer in a sealed unit, super low mA available, several configs (mini, space limited, single/dual coil) The few I clicked on were only 10 bucks.

http://www.advancedcomponents.com/st..._miniature.htm


Pre made:

http://www.jameco.com/1/1/551-adu240...ter-ac-ac.html

http://www.jameco.com/1/1/2118-mgt24...ter-ac-ac.html

http://www.jameco.com/1/1/1010-adu24...ter-ac-ac.html

http://www.amazon.com/Transformer-Po...%22ac+to+ac%22

These seem like high load supplies:

http://www.amazon.com/Elk-TRG2440-24.../ref=pd_cp_e_0

http://www.amazon.com/24VAC-50amp-Si.../ref=pd_cp_e_3
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Old 01-18-2013, 03:09 PM   #50
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NICE!, getting them right now.

have a question though, is it the one from amazon suppose to be cheaper?
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Old 01-18-2013, 03:13 PM   #51
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I am not an electrical engineer, but from a little research this is what I think is happening:
When you flip through the instruction booklet that comes with the Burkert 2822 it tells you to use a special $250 power supply. It produces a modulated power - "The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast pace" - wikipedia. This is how a switch mode power supply works via a circuit board. transformers use two opposing coils and a magnetic field to reduce voltage (and output can vary with input fluctuations). I think what is happening is these solenoids are very precise pieces of equipment and do not handle voltage fluctuation at all (like a higher output than 24v thus getting very hot or not even working). I started out with a Jamco class 2 transformer (heavy bulky plug-in, coils and a metal housing) and it just did not work that well. I ordered a switch mode power supply (light weight small plug-in, circuit board) and now it works awesome without the added heat. switch mode will always put out a constant voltage (much like the modulated power supply Burkert suggests).
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Old 01-18-2013, 03:16 PM   #52
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oh and the milliamps of the switch mode power supply does not matter as long as it is enough. The number is a max potential energy the plug-in can produce - your solenoid will only pull what it needs (2w).
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Old 01-18-2013, 03:17 PM   #53
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^ Good lord,

Sometimes I forget this is a fish tank forum.

Can someone summary all this in English?

If I buy this "x" solenoid, it needs this "x" DIN so you buy this "x" product.
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Old 01-18-2013, 03:19 PM   #54
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just get a swith mode power supply that is it least 100 ma (for a 2 watt solenoid)

I was thinking that post was getting a little out of hand lol.
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Old 01-18-2013, 03:38 PM   #55
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NICE!, getting them right now.

have a question though, is it the one from amazon suppose to be cheaper?
Got me that was a small amount of electrical knowledge & experience combined with some decent Google-Fu!
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Old 01-18-2013, 03:44 PM   #56
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- I think you are talking to me?
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Old 01-18-2013, 03:48 PM   #57
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need some rest before I can understand flyinghellfish and eatfood, then sort this thing out, good night to myself 8:40AM in the morning,
r...
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Old 01-18-2013, 06:37 PM   #58
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^ Don't mind me, I have no idea what you guys are talking about.

eatfood just took this hobby equipment selection to another level. I will leave you gents to your discussion, good day.
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Old 01-18-2013, 07:15 PM   #59
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So will this one work? http://www.jameco.com/1/1/551-adu240...ter-ac-ac.html

Does it matter that it is 1000ma
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Old 01-18-2013, 07:31 PM   #60
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^ no that is a transformer, ebay search 24v switching power supply should find you what you need (for a burkert 2822). basically they look like cell phone chargers (actually cell phone chargers are switching power adapters)
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