v2comp
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I am brand new to this and I have a question, I want to fill 3 small water tanks with (1) water valve at the same time and I have 3 separate float valves with switches ( one in each tank), I dont want the main water valve to switch off until all three reach full. the float valves/switches control the water flow indepentently by shutting off the flow themselves manually at each tank, but as one fills I need the remaining to continue to fill. I want the main water valve (motorized ball valve) to continue until all 3 are full. I am struggling with how to structure the ladder correctly without having separate motorized ball valves at each tank, but because the float valves/switches can shut off the flow mechanically themselves as well as send an electrical signal back to an input, I just want the main water valve to be the only other valve component can someone please help me structure the ladder correctly? I have been reading and trying different things, but it isnt working. the valve shuts off as soon as the first first tank reaches full and I just dont know enough to fix it.
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Thanks guys. I appreciate the help, yes, I am all for this thing being as safe as possible and appreciate the guidance, I figured out the wiring and addressing the thermocouples before I read the response post, (stupid oversight on my part) I bought the plc over a year ago and read the pdf's then, and knew I had read about where to wire the thermocouples before and how to address them, I had just forgot where to look.
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v120-22-UN2 question about wiring an analog input. I know this is basic wiring stuff for most of you guys, but I need help understanding how to wire and address a type k thermocouple. on the PLC itself, (I7 I8) and (I9 I10) are dedicated analog input terminals. if I attach each wire from a two wire type k thermocouple to I7 and I8, which one do I use for the input operand address.?
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I have been looking, and the Honewell units (169.00 ea) seem like a reasonable option, (but I dont know anything about them either). in terms of placement in the system, you saw how I originally have the components laid out, where would you advise putting them? should they just control a seperate gas valve inline before the proportional valve? I understand that they are looking for flame, and if they dont see it, they wont open or fire the spark igniter, my questions about them are some of the specs they show, if I understand the wording they use it looks like if one of them doesnt see the flame that they have prepurge waiting cyucles of 30 seconds and reset settings of 20 seconds, am I gonna have to have some kind of air to clear out the gas or can I just let it function without that. these little burners arent gonna need a ton of makeup air but either way I am instaling a vapor hood and make up air system in the building just to make sure I dont kill myself with carbon monoxide fumes. I would really appreciate any advise you can give. thanks. EDIT: I found some more units, they are twice the cost, but are new technology and can control multiple burners at once "Automatic Burner Control Unit IFD 258" from Combustion 911. probably overkill, but they look like they will control the flame, ingite the burners after a fault automatically and have all the safety built in. I can still control the proportional gas valve with the PLC and leave the flame control to the device. if you see anything wrong here let me know.
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thanks Keith, I appreciate your suggestion and will do exactly as you said if they are easy enough to find. I am all for doing this safely and would be glad to put these into the system. thanks again. I didnt even know they existed......
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I am Don, but I need to learn how to program the plc myself. I am not wiring the electrical cabinet, plumbing the gas or even the water for that matter. I just need to learn how to use the plc so I can make changes without having to call someone to make normal changes to the processes and such. believe me, I have no interest in burning down my building or killing myself or anyone else...
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I am Don, but I need to learn how to program the plc myself. I am not wiring the electrical cabinet, plumbing the gas or even the water for that matter. I just need to learn how to use the plc so I can make changes without having to call someone to make normal changes to the processes and such. believe me, I have no interest in burning down my building or killing myself or anyone else...
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Hi v2comp,
I would study the documentation for your proportional valves. The valves I have used have had a 'sealing function' or 'cutoff' parameter which would completely close the valve if the PLC's analog output fell below a threshold.
I was controlling water. Gas is considerably more hazardous, so take care and consider employing the services of a qualified co...
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thank you very much, it really has helped me get started.
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dont know why it double posted, the other is a Koganei KFP050-2-30-FM-BR-02
High-precision Proportional Control Valve has been newly developed, which is optimum for the production lines, plants, etc of air, gas, liquid, etc. The stepless control is realized, which is necessary to control the flow rate of gas and liquid. Standard input signal can be selected from 4 to 20mA in current as wel...
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dont know why it double posted, the other is a Koganei KFP050-2-30-FM-BR-02
High-precision Proportional Control Valve has been newly developed, which is optimum for the production lines, plants, etc of air, gas, liquid, etc. The stepless control is realized, which is necessary to control the flow rate of gas and liquid. Standard input signal can be selected from 4 to 20mA in current as wel...
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I guess the Moderators dont want other equipment manufacturers product specifics listed on the forum, I guess I should have read that somewhere, but anyway, the two different proportional gas valves and controllers I have are:
1 ASCO 8202 posiflow 24vdc and its controller
2-Way, Direct Acting, Brass or Stainless Steel Bodies, 1/8" to 3/8" NPT.
Flow rates adjustable...
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I guess the Moderators dont want other equipment manufacturers product specifics listed on the forum, I guess I should have read that somewhere, but anyway, the two different proportional gas valves and controllers I have are:
1 ASCO 8202 posiflow 24vdc and its controller
2-Way, Direct Acting, Brass or Stainless Steel Bodies, 1/8" to 3/8" NPT.
Flow rates adjustable...
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if I use expansion modules #'s IO-ATC8/A18 and IO-A06X with the 120-22-UN2 controller, will that work to control the proportional valves that I listed in my last reply?
thanks