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snwcmpr
12/07/2019 9:29 AM
roar

snwcmpr
11/27/2019 11:44 AM
greenman

allenb
11/27/2019 11:04 AM
Nice! I know Netrix is going through things and tweaking as he see's issues

snwcmpr
11/26/2019 1:35 PM
I got an email that I had a PM. So, that is working for me again. greenman

snwcmpr
11/26/2019 1:33 PM
Howdy Howdy!!

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How to control a fluidbed roast profile?
allenb
tamarian wrote:

allenb wrote:

tamarian wrote:

allenb wrote:
You will definitely need a driver between the Fuji and valve and the driver looks like it can accept either 4-20 or 0-10 control modes.


You mean a converter won't work? This is the one I ordered: http://controlsce...fault.aspx


What would be the purpose of having the 4-20 mA option? I'm assuming you're not looking to try and power the valve's coil with this?

Allen


The valve is powered and controlled by a control signal. The confusion is whether it is a 0-10VDC signal or a 0-20mA current signal, that is yet to be answered/clarified by Clippard. If it's a VDC input signal, that's a match with Fuji's VDC output signal. If it's a current signal 0-20mA, then a signal converter/transducer taking 0-10VDC signal and converting it to a 0-20mA signal should work.

Is it not the same as a driver taking a 0-10VDC signal and outputting 0-20mA signal?


All of the data I've found on Clippard's and Kelly's websites and uncovered over the phone is consistent in that these valves modulate via current and the 0-10 volts needed for driving your valve is simply for creating the 0-185 mA current. You will not be able to drive your valve with 20 mA as it will need at least 70 mA just to start to open. Control systems converters, transducers etc will not help you as you need a driver which takes a 4-20 mA or 0-10 vdc input from a PID controller and outputs the 0-185 mA's in your case.

I read a little more on Clippards website about their driver and it's got a nice feature that allows scaling the output to allow the valve to start opening as soon as the driver sees 1 volt from the 0-10 vdc output of your fuji.

Not sure how much $ the Clippard driver is.

For everyones benefit, could you point to where you saw the Clippard folks state their valve could be operated from a 4-20 mA signal?

Hang in there!

Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
 
tamarian
For everyones benefit, could you point to where you saw the Clippard folks state their valve could be operated from a 4-20 mA signal?

That was an email response to my first enqiry via web support:

The EVP is a current based valve, 4-20Ma, you need to be certain your controlling current over voltage. Maybe have your distributor show you ways to control the valve.
Thanks


I then contacted the distributor, Gulf controls and got the same response:

I just called the factory and was told that you need to check if the system is getting 4 to 20 milliamp.
Could you check the current and voltage on the system and let me know the readings?


I then sent a detailed enquiry referencing the spec sheet, and the 0-10VDC input signal selected in the order options, plus mention of my PXG4 output, and what they think I will need to get the two to work, and waiting for response.
Wa'il. 1 Kg PID'ed gas-fired fluid bed roaster, GS/3MPS, K10F
 
http://english.varietalcafe.com
tamarian

Not sure how much $ the Clippard driver is.


$109 http://www.clippard.com/part/EVPD-1

http://www.clippa...Driver.pdf

http://www.clippa...Manual.pdf
Wa'il. 1 Kg PID'ed gas-fired fluid bed roaster, GS/3MPS, K10F
 
http://english.varietalcafe.com
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