My proportional valves work with 3 wires. but the new controller i got can only work with 2 wires. The way i understand it the 3 wire got 2 coils if you set the voltage one will go up and the other down. So if the one is at 8 V the other coil will drop to 2 V. Any help of solving this problem the best way would be appreciated.

 

My proportional valves work with 3 wires. but the new controller i got can only work with 2 wires. The way i understand it the 3 wire got 2 coils if you set the voltage one will go up and the other down. So if the one is at 8 V the other coil will drop to 2 V. Any help of solving this problem the best way would be appreciated.

Get a new controller that works with the old valves, or get new valves that work with the new controller.

 

What is the problem that you are talking about? The problem i see is that you did not read datasheets or post links, or at least post part numbers of devices you are trying to use. Internet is full of "valves", "controllers", "new" and "old"...

 

What proportional valve?
What controller?

 

Agree.
What is the make/model of valve,? some 3 wire proportional valves I have worked with that have 3 conductors are 4-20ma control loop!

 

"Proportional Valve" only describes a general functionality. A much more detailed description might provide the basis for a useful suggestion.
In post #2 BOB provided the good solution based on the information we have.

 

What proportional valve?
What controller?

What proportional valve?
What controller?

 

The new controller is a complete PLC computer for injection molding machines. Most proportional valves work with one coil and a spring, But mine got 3 wires it works from 10 V it got 2 coils so if you change the speed or pressure you will change the voltage on both sides for taking the P/S up or down. Is there something i can buy or a circuit one can make to regulate the voltages.
Marcel

 

Is there something i can buy or a circuit one can make to regulate the voltages.

Yes, but unless you are prepared to share the technical description of the valves you will have to do it yourself.

 

I have installed new controllers on injection blow- molding machines, and for absolutely certain, we need more details about those "proportional valves" that the TS is asking about. It is quite likely that nobody in that organization has any clue about any of that technology.
Neither an accounting degree nor a management degree require any understanding of industrial controls technology. THAT is why I became involved in some of those projects.

 

I can’t help but think that replacing the valves is the cheapest, simplest solution.

 

Consider the information that we are not given: Not one word about what te three wires provide, nor any information as to what the output of the controller is. So with that, the very best that the TS can expect is random guesses.

 

Another one for the Great Carnac !

 

One more option: Often, when you buy from a company that is not amazon, there is technical support for the application of the products that they sell. What brand is that controller?? Even many distriputors have customer assistance applications engineers who are often able to assist or to get information. ( but NEVER amazon)
Is it actually controlling the production of the PARISON, prior to blowing??
(The PARISON is the glob of plastic that is squirted out before the mold closes and it gets blown to fill the mold.)
For those operations there was always a position feedback channel in the controller.

 

One more option: Often, when you buy from a company that is not amazon, there is technical support for the application of the products that they sell. What brand is that controller?? Even many distriputors have customer assistance applications engineers who are often able to assist or to get information. ( but NEVER amazon)
Is it actually controlling the production of the PARISON, prior to blowing??
(The PARISON is the glob of plastic that is squirted out before the mold closes and it gets blown to fill the mold.)
For those operations there was always a position feedback channel in the controller.

Where exactly did anyone say anything about plastics? Parison is a continuous extrusion blow molding concept. Your previous mention of injection molding has nothing to do with parisons. What did you actually work on?

Other than that I know enough to know that without part numbers or specs this is a worthless question by the TS.

 

In post #9 the TS mentions an injection molding machine. THAT is where plastics came in. I asked about parisons because I have installed controllers on blow molding machines. AND the TS was very nebulous in their descriptions. So I was hoping for an explanation of what the application was, telling me it was not that, but describing what it was.

AND, my comment about CUSTOMER SUPPORT was on target!! Legitimate companies do understand what they are selling. So they ARE able to provide customer support. (Nasty comment deleted before anyone saw it)

 

@MisterBill2 my apologies!! I was in a nit picking mood and I missed the injection molding comment for some reason.
I'll 100% agree customer support would be a much better place to get answers than asking questions to random people on the internet. Most likely there was even a part number on the original valve to use to order a new one that would have avoided the whole situation in the first place.

 

What I HAVE SEEN in smaller factories is that there is ONE repair person tasked with keeping all of it working, and one person with possibly an accounting degree handling all of the purchasing , including making decisions about exactly which versions of a controller get ordered. And that person has less technical expertise than my friend's cat. Who IS a very smart cat, but can not read and understand a data sheet at all.

 

Yes, but unless you are prepared to share the technical description of the valves you will have to do it yourself.

So many replies.
Lets see if I can explain successfully. The controller computer does all the functions like open, close, inject, eject and load more plastic. the 3

The new controller is a complete PLC computer for injection molding machines. Most proportional valves work with one coil and a spring, But mine got 3 wires it works from 10 V it got 2 coils so if you change the speed or pressure you will change the voltage on both sides for taking the P/S up or down. Is there something i can buy or a circuit one can make to regulate the voltages.
Marcel

 

So many replies.

Hi so many replies, lets see if i can explain successfully. The controller computer drives all the 24 v dc solenoids for mold open , close, inject, eject, plastic load. It has 3 proportional valves that works from 10 volt for speed, pressure and back pressure. I can from the computer select what speed or pressure i want to use. for what application. The controller got a positive and negative for each proportional valves. My machine got 3 wires i tested it it's got 2, 23 Ohm resistance values going to the third wire that i will take as the negative. Proportional valves with 2 wires use a spring and you then select a voltage for the distance the coil to move. The 3 wire use 2 coils of 23 Ohm what i need is a way of lowering the one coils voltage and increase the other to regulate the pressure. Not sure if everyone will see this reply?