Not sure if everyone will see this reply?

Replies go to the thread, which everyone (who looks) can see. No need to reply undividually.

One could certainly build a circuit that takes the single-sided voltage from the controller and outputs a double-sided voltage for your solenoids. The first thing you need to do is determine how the voltages map from one to the other.

You are going to need two complementary voltage controlled voltage sources, plus the logic to invert the control voltage. Minimally, we are talking about several op amps and two pass transistors of opposite polarity.

That is if the mapping is linear. If it is something more complicated, you might need a microcontroller, or analog circuit (more opamps) to do the mapping.

 

Did any instructions or information come with the new controller?? Or did it come from amazon, ?? The controllers that I installed were "MOOG" brand and came with a fair amount of information.

 

Alibaba seems to have a number of "PLC" injection molding controllers. I won't bash anyone for taking that route, but I will say you get what you pay for on something like this. Personally I wouldn't trust any sort of home made circuits to work on something like this that has the potential of creating very unsafe conditions.

I personally haven't worked with injection molding, but in the blow molding side of things where I do have experience molten plastic at over 3000 psi can do some interesting stuff. Luckily those machines had rupture disks and were programmed to shut down typically between 4000 - 4500 psi depending on the material so the only real damage was a couple disks due to strange circumstances. There were rare instances though were cold plastic caused enough of a blockage to send it a few feet when enough pressure was behind it. Kind of like popping a pimple. I did see some reports from other plants in the company and nylon blowing apart much more spectacularly.

From what I understand with injection molding closer to 6000 psi is the starting point up to around to 30000 psi. I would want something proven and reliable myself.

 

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.

Did any instructions or information come with the new controller?? Or did it come from amazon, ?? The controllers that I installed were "MOOG" brand and came with a fair amount of information.

Did any instructions or information come with the new controller?? Or did it come from amazon, ?? The controllers that I installed were "MOOG" brand and came with a fair amount of information.

Yes the controller came with the manual. It is from China, there are many you-tube videos showing machines using this product. Its made by Porcheson. I was thinking but i am no expert on this. The power supply that came with the kit also have an additional 10 V that is not controlled by the computer or controller, if i would to use that 10 V with a resistor on the one coil and regulate the other coils 10 V from the computer. The way i see it it's just 2 10 V coils moving in different directions to change a pressure or speed on a hydraulic valve, or is it more complicated and rather i speak to hydraulic experts. On the valve pressure issue i don't think there will be a problem, all the valves are just like it was till the old controller failed so those proportional valves was made for that machine.

 

I am guessing that the manual is not translated into a language that any of us can read. I certainly am not able to translate Chinese technical writing. BUT often the circuit illustrations make sense even when the text is not translated.

 

I am guessing that the manual is not translated into a language that any of us can read. I certainly am not able to translate Chinese technical writing. BUT often the circuit illustrations make sense even when the text is not translated.

No the manual is in English. I tried finding more information regarding the proportional valve from hydraulic people without success. so I striped the valve and found its coil is so small its impossible to have 2 coils in it. This mean it only work from 1 coil. But this leaves me with a new problem. The plc for controlling the proportional valves work by varying a 10 volt to change the speed and pressure on the hydraulics. My problem now is that my coil is 24 volt, it must works by regulating that 24 volts between lower voltages. Any ideas of how I could solve that problem?

 

How many wires coming out of the coil? It is likely a center-tapped coil.

 

Is it possible to post the portion of the manual that relates to the valve connections and specifications?? There are some folks here who could make some sense of it. IF it makes any sense at all.

 

How many wires coming out of the coil? It is likely a center-tapped coil.

No i removed the coil and it is working fine on 24 volt. I think the 3d wire must have been for some reading on the old controler. My machines proportional valve just have a small 9mm spring loaded plunger and its total travel is only about 10mm. My problem is the controller from China use a 10v output for the proportional valve and my machine needs 24v for its proportional valve to operate. So what i will need is a regulator working from a variable 10v input converting it to variable 24v output. Any ideas of the best way of achieving that?

 

No i removed the coil and it is working fine on 24 volt. I think the 3d wire must have been for some reading on the old controler. My machines proportional valve just have a small 9mm spring loaded plunger and its total travel is only about 10mm. My problem is the controller from China use a 10v output for the proportional valve and my machine needs 24v for its proportional valve to operate. So what i will need is a regulator working from a variable 10v input converting it to variable 24v output. Any ideas of the best way of achieving that?

OK, this is a big change! How is it "working fine on 24 volts" if the controller is only supplying up to ten volts??
That tells me that an amplifier stage is needed to provide zero to 24 volts out with an input of zero to ten volts. Easily done, but it will require more circuitry.

 

A power opamp can easily do that, amplify the 0 to 10V range to a 0 to 24V range. You will probably need 28V to power the opamp.

I worry, though, that the third wire is feedback and the valve will not operate reliably without a closed loop using feedback to sense the position.

 

So what is needed is a response on exactly what was connected to that third wire. Referenced to post #29. If it is not connected then that issue is resolved!!

 

This whole idea is possibly an expensive problem
just looking for a place to happen, and a serious waste of time.

Mixing and matching Voltages, and Devices, and Controllers,
without a reasonable understanding of how all the parts/Devices/Voltages work
together to achieve a desired end-result is just asking for trouble.

The various manufacturers responsible for this Machine
specified certain specifications for all of the parts for
what they thought were actual important reasons.
And, they're probably smarter than You on this subject.

Some people just have to learn things the hard-way.

I hope nobody gets hurt because of this foolishness.
.
.
.

 

A power opamp can easily do that, amplify the 0 to 10V range to a 0 to 24V range. You will probably need 28V to power the opamp.

I worry, though, that the third wire is feedback and the valve will not operate reliably without a closed loop using feedback to sense the position.

I hear what you are saying about the 3d wire. The new controller only allow for 2 wires and you can set on its computer for what speed or pressure you want to use. As the plunger movement is only 10 mm for all allowable voltages the movements must then be very small. If the 3d wire does play a role it could only be to keep the voltage constant i can't see what other role it could play. Regarding the power opamp would you have a circuit for me?

 

If the 3d wire does play a role it could only be to keep the voltage constant i can't see what other role it could play

That shows no understanding.

I wish I had not said this now, because I don’t want to encourage you to do something dangerous that is beyond your ability.

I am reverting my position to my first post. Get components that are designed to work together.

 

The fact that the TS has made no reference to any literature that should have been with the new controller is very disturbing indeed!! I am wondering if the new controller was purchased from amazon, a seller notorious for being unwilling and unable to provide any customer support.
The refusal to even mention the brand name of either the new controller or of the proportional valve is a bit disturbing. IT has the smell of a

 

The fact that the TS has made no reference to any literature that should have been with the new controller is very disturbing indeed!! I am wondering if the new controller was purchased from amazon, a seller notorious for being unwilling and unable to provide any customer support.
The refusal to even mention the brand name of either the new controller or of the proportional valve is a bit disturbing. IT has the smell of a

No i did mention the name its Porcheson. I looked on youtube there are many videos showing machines using this controller. I got all the literature from the controller. My problem is that the new controller only have 2 wire for a variable 10v output. In its manual it show how you can set the speeds and pressures on the computer that came with the kit. Problem is my proportional valves work on 24v.

 

Problem is my proportional valves work on 24v.

So why not replace the valves?

Yes, it might be expensive, but idling the machine or, worse yet, destroying it, has to be more expensive.

Edited to add: You could gave been done by now.

 

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.

What on earth is a "proportional valve"? do you mean one of these?

 

No i did mention the name its Porcheson. I looked on youtube there are many videos showing machines using this controller. I got all the literature from the controller. My problem is that the new controller only have 2 wire for a variable 10v output. In its manual it show how you can set the speeds and pressures on the computer that came with the kit. Problem is my proportional valves work on 24v.

What does the product literature say about the driving circuits?? Forget what the cartoon channel shows about machines working, what is described in the manuals as to how the system should work??