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    0-10 Vdc power supply

    We have a machine that needs a 0-10 Vdc signal in order to generate a speed reference. The problem is this is a remote cabinet and not easily done from a PLC output. To test the setup I used a small pot switch with a 9V battery to generate a signal which works, however i need something permanent now. I am looking to order one of these https://www.circuitspecialists.com/csi1501.html but would be interested in some suggestions. I have 120Vac as well as 24 Vdc and 12Vdc available in the cabinet

    #2
    How far is the machine from the PLC? What was your line loss on your signal?

    Originally posted by MattS87 View Post
    We have a machine that needs a 0-10 Vdc signal in order to generate a speed reference. The problem is this is a remote cabinet and not easily done from a PLC output. To test the setup I used a small pot switch with a 9V battery to generate a signal which works, however i need something permanent now. I am looking to order one of these https://www.circuitspecialists.com/csi1501.html but would be interested in some suggestions. I have 120Vac as well as 24 Vdc and 12Vdc available in the cabinet
    PJHolguin 8-)

    Comment


      #3
      That would work fine and you can't beat the price but it is really a bench supply and might be overkill for what you are doing. Does the voltage need to be continuously adjusted or can it be set and left alone and/or infrequently need to be adjusted? Any reason why you couldn't just use the 12VDC you have available and use a pot like you did with the battery?

      -Hal

      Comment


        #4
        Originally posted by MattS87 View Post
        We have a machine that needs a 0-10 Vdc signal in order to generate a speed reference. The problem is this is a remote cabinet and not easily done from a PLC output. To test the setup I used a small pot switch with a 9V battery to generate a signal which works, however i need something permanent now. I am looking to order one of these https://www.circuitspecialists.com/csi1501.html but would be interested in some suggestions. I have 120Vac as well as 24 Vdc and 12Vdc available in the cabinet
        That item you showed should work.but it looks like it is designed for testing purposes. As such, may not be designed to be hooked up "permanently" to production machine working 24/7,

        There is an alternative which is a lot cheaper. I gather, you are not adjusting the output constantly correct? You set the pot and leave it that way.

        If this is the way that I think, you can use a buck/boost converter since you mentioned you have a 12 vdc available in the cabinet. There is an item I've been using on my electronic projects available on flea bay.

        It is stable, I've never seen it drift in my preamp for my home theater. I also use them in my RV.

        It is rated 3 amps which is more than you need. It also has current adjustment along with the volts trim pot.

        Check it out. Ebay item 283060129385. There are other models if this one is not to your liking.

        It's so cheap you can get a whole bunch before the tariff kicks in.
        Good luck.

        Comment


          #5
          Originally posted by hbiss View Post
          That would work fine and you can't beat the price but it is really a bench supply and might be overkill for what you are doing. Does the voltage need to be continuously adjusted or can it be set and left alone and/or infrequently need to be adjusted? Any reason why you couldn't just use the 12VDC you have available and use a pot like you did with the battery?

          -Hal
          It will never be adjusted unless the machine is upgraded (not likely). I was just hoping for something a little more 'factory' as in not homemade but seeing as how it will be in a locked cabinet a simple pot could work.

          I know they come in different ratings, any insight on how to chose the right style?

          Comment


            #6
            Originally posted by myspark View Post
            That item you showed should work.but it looks like it is designed for testing purposes. As such, may not be designed to be hooked up "permanently" to production machine working 24/7,

            There is an alternative which is a lot cheaper. I gather, you are not adjusting the output constantly correct? You set the pot and leave it that way.

            If this is the way that I think, you can use a buck/boost converter since you mentioned you have a 12 vdc available in the cabinet. There is an item I've been using on my electronic projects available on flea bay.

            It is stable, I've never seen it drift in my preamp for my home theater. I also use them in my RV.

            It is rated 3 amps which is more than you need. It also has current adjustment along with the volts trim pot.

            Check it out. Ebay item 283060129385. There are other models if this one is not to your liking.

            It's so cheap you can get a whole bunch before the tariff kicks in.
            Good luck.
            The description states 5V-30V output which won't work for me. Currently the temp pot is set @ 2V which is equivalent to 200 fpm and 350 fpm is the max the machine can go currently

            Comment


              #7
              Originally posted by MattS87 View Post
              It will never be adjusted unless the machine is upgraded (not likely). I was just hoping for something a little more 'factory' as in not homemade but seeing as how it will be in a locked cabinet a simple pot could work.

              I know they come in different ratings, any insight on how to chose the right style?
              Do you know if there is any current draw for the 0-10V is or is it just a reference voltage?

              A screwdriver adjustable pot mounted through a 3/8" hole in something would certainly be professional.

              -Hal

              Comment


                #8
                Originally posted by hbiss View Post
                Do you know if there is any current draw for the 0-10V is or is it just a reference voltage?

                A screwdriver adjustable pot mounted through a 3/8" hole in something would certainly be professional.

                -Hal
                I couldn't say the exact draw, but it goes to an analog input card so i wouldn't think much

                Comment


                  #9
                  https://www.alliedelec.com/nte-elect...0005/70117607/

                  Allied tends to be expensive, I'm sure you can do better but if you only need one...

                  I'm thinking a 1K, that should keep the dissipation at 12V through the pot at 0.12w, well below the 2W rating. If it's truly just a signal voltage you could go higher to 10K it really isn't critical. You will want to connect your 12V to the two outside terminals, ground or zero to the right hand one when looking at the pot from the front shaft end. That will give you the customary turn to the left or CCW to turn the voltage down. You take your 0-10 "output" from the center terminal and the right ground or zero.

                  Classic adjustable voltage divider.

                  -Hal
                  Last edited by hbiss; 08-17-18, 01:00 AM.

                  Comment


                    #10
                    Originally posted by hbiss View Post
                    https://www.alliedelec.com/nte-elect...0005/70117607/

                    Allied tends to be expensive, I'm sure you can do better but if you only need one...

                    I'm thinking a 1K, that should keep the dissipation at 12V through the pot at 0.12w, well below the 2W rating. If it's truly just a signal voltage you could go higher to 10K it really isn't critical. You will want to connect your 12V to the two outside terminals, ground or zero to the right hand one when looking at the pot from the front shaft end. That will give you the customary turn to the left or CCW to turn the voltage down. You take your 0-10 "output" from the center terminal and the right ground or zero.

                    Classic adjustable voltage divider.

                    -Hal
                    Thanks for that. I was looking around here to see if we had any old equipment to scrap one off of but no luck. The resistance part is what confuses me on these (whether to pick 1K, 5k, 10K)

                    Comment


                      #11
                      180817-0302 EDT

                      MattS87:

                      You really need to know whether the input at at the PLC is isolated from ground, common, or some PLC power supply reference. If not, then your remote power supply must be isolated from anything else or there will be some sort of ground loop problem.

                      To limit the output adjustment range I would add a series resistor from +12 V to the pot + terminal. I suggest an AB linear 1 k 2 W pot. Identical units are available from Ohmite (Allied Electronics, or Newark).

                      An added 1 k 1/2 W series resistor will limit you to 6 V from a 12 V source.

                      Note: power is V^2/R.

                      .
                      Last edited by gar; 08-17-18, 03:41 AM.

                      Comment


                        #12
                        Originally posted by MattS87 View Post
                        We have a machine that needs a 0-10 Vdc signal in order to generate a speed reference. The problem is this is a remote cabinet and not easily done from a PLC output. To test the setup I used a small pot switch with a 9V battery to generate a signal which works, however i need something permanent now. I am looking to order one of these https://www.circuitspecialists.com/csi1501.html but would be interested in some suggestions. I have 120Vac as well as 24 Vdc and 12Vdc available in the cabinet
                        What are you controlling the speed of?
                        Si hoc legere scis nimium eruditionis habes.

                        Comment


                          #13
                          Does the device not have a built in power supply

                          Are you using a VFD or DC drive to control the speed ? Most have a built in power supply for speed reference.

                          Cowboy

                          Comment


                            #14
                            An added 1 k 1/2 W series resistor will limit you to 6 V from a 12 V source.
                            Why not a 200 ohm resistor- that will give him the 10v max he is looking for.

                            -Hal

                            Comment


                              #15
                              180817-2030 EDT

                              hbiss:

                              In post #6 [COLOR=#000000]MattS87 said
                              [/COLOR]
                              [COLOR=#333333]The description states 5V-30V output which won't work for me. Currently the temp pot is set @ 2V which is equivalent to 200 fpm and 350 fpm is the max the machine can go currently[/COLOR]
                              It appears MattS87 requires nothing like 10 V and never expects to. Thus, limit the pot range which makes the setting of the pot less critical. It might even be better to limit the pot range to 4 V instead of 6 V.

                              Fixed resistors could be used if there was never a reason to change speed. But, I really think some adjustment is a good idea.

                              .

                              Comment

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