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  • #16
    For clarity, the power supply in question is NOT the main Viewmarq power supply. It is one of the local (lower voltage regulator) power supplies on the LED board.
    My guess is that it powers the led drivers and maybe logic.

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    • #17
      Getting ready to try something.
      We will be going with a modified version of Brandon_'s suggestion(thanks). A Rhino powersupply mounted on the back of the Viewmarq - using one of the mount brackets from another display.
      We will look into keeping fingers and pokey bits from getting into the 120V on the Rhino.
      Also, we will be replacing the unshielded CAT6 with a shielded Cat5e. To break the cable shielding at the Viewmarq, we will be using a keystone coupler and short patch cable tucked into the Viewmarq.


      Click image for larger version

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      Guys, thanks a lot for your suggestions and guidance.
      Attached Files

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      • #18
        To isolate the Ethernet and make it noise immune it would be easy to convert to fiber at each end, but as many as it sounds like you have it would probably be too expensive.

        But...just introducing an unmanaged switch at the Viewmark end would electrically isolate the display from the long antenna portion of the cable, and if the switch dies, that only cost < $100 to replace.

        I've added a switch in cases where an HMI couldn't drive a long run to a site router/gateway, point being it gets you a new transceiver on the wire.

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        • #19
          Good luck with it kewakl . Keep us updated.

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          • #20
            Originally posted by ControlsGuy View Post
            To isolate the Ethernet and make it noise immune it would be easy to convert to fiber at each end, but as many as it sounds like you have it would probably be too expensive.

            But...just introducing an unmanaged switch at the Viewmark end would electrically isolate the display from the long antenna portion of the cable, and if the switch dies, that only cost < $100 to replace.

            I've added a switch in cases where an HMI couldn't drive a long run to a site router/gateway, point being it gets you a new transceiver on the wire.
            If the issue comes in on ethernet...

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            • #21
              Originally posted by kewakl View Post
              For clarity, the power supply in question is NOT the main Viewmarq power supply. It is one of the local (lower voltage regulator) power supplies on the LED board.
              My guess is that it powers the led drivers and maybe logic.
              According to the circuit you posted on the previous page, it looks like around 24v gets fed to that regulator chip. Since you were feeding 120v AC into the viewmarq, that means it is converting inside the unit from the AC to DC. Most likely this is a cheap circuit so likely if the incoming voltage has a spike where it rises above 120v AC, then it may also proportionally increase the DC voltage as well. This could cause the burnout you are seeing when the voltage exceeds the ratings. So it is possible this failure is due to incoming main line voltage. Your new solution of removing the 120v AC and isolating it by using a better 24v PSU should solve this potential problem.


              As for moving from unshielded to shielded ethernet cable, remember that cat5e tends to have just a basic foil wrap around the cable as a whole. This is most effective for radio frequency noise which would be your issue, but cat6a, cat7, and cat8 have much better shielding that has the overall foil shield and an additional thicker braid shield over each conductor pair underneath the foil shield. This is sometimes called S/STP or F/STP, though on these higher grade cables they typically have both shield methods even if they just say "STP". I dont know of any Cat5e cable listed as just "STP" that has the double shielding type.
              So if you are going to go through the cost and trouble of replacing your cables anyway, you should really just go with the much better cable rather than a "half measure".

              Though I believe the problem most likely is with the incoming main power lines and not the comm line here.
              Last edited by MikeN; 10-09-2019, 01:53 PM.

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              • #22
                Well, Now it gets said!

                Cc: ragroup@automationdirect.com <ragroup@automationdirect.com>
                Subject: Re: Fw: Sales Inquiry, viewmarq [ ref:xxxxxxxx]


                There was an issue with the panels that has been corrected.

                In abnormal but withing[sic] specification installations a component may overheat and fail causing a line to go partially or completely RED or BLANK.

                There is no indication that there is a high rate of failures among customers. We have had only 3 customer report issues. But if the product has failed in this manner and is in warranty or not long out of warranty please replace the product as under warranty. Most seem to be failing within the warranty or just beyond the warranty period.

                We can replace these as a warranty failure even though somewhat out of warranty.

                Please contact returns and they will get you replacements.



                s
                m
                h


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                • #23
                  Originally posted by kewakl View Post
                  Well, Now it gets said!
                  Well, that answers that. At least we know the root cause.

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                  • #24
                    The APC 1500 ups would isolate the unit from power flux.

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                    • #25
                      Originally posted by NevergoldMel View Post
                      The APC 1500 ups would isolate the unit from power flux.
                      All basic "line interactive" uninterruptible power supplies will not help at all. They allow regular line voltage through them and only switch to battery/conditioned voltage during abnormal voltage conditions or dropouts. If he is getting spikes from welding operations then the UPS would be switching dozens of times during the day causing power fluctuations of its own and having a very short lifespan of the unit.

                      Only an expensive "on-line UPS" (sometimes called double conversion) would be acceptable for his installation as that is running all the time and uses a rectifier, battery, and inverter to 100% separate incoming line voltage from outgoing voltage. This is effectively the same as what Kewakl already did with switching to a DC power supply and DC inputs to the Viewmarq. Only real difference would be that the UPS provides backup power, which isnt actually needed here.
                      Last edited by MikeN; 10-17-2019, 11:28 AM.

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                      • #26
                        Originally posted by MikeN View Post
                        ... the same as what Kewakl already did with switching to a DC power supply and DC inputs to the Viewmarq.
                        Just to be clear, I shamelessly stole that idea from Brandon_!

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