Allen-Bradley SLC 500 PLC switching power supply dead

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • sam_sam_sam
    Badcaps Legend
    • Jul 2011
    • 6039
    • USA
    #1

    Allen-Bradley SLC 500 PLC switching power supply dead

    Allen-Bradley 1747-L30C Series C FRN 6 SLC 500 Processor Unit

    About two weeks ago this PLC gave some problems turning on but I was able to get it to turn on

    Then yesterday it would not turn on at all so I took it apart and found that it has a switching regulator ic chip ( MA-1050 ) which I found some I bought 2 of them

    I have bought from this seller a few times before

    https://www.ebay.com/itm/MA1050-Orig...53.m2749.l2649

    Going to recap this power board and change the optic sensor because it looks like it has been running warm it is yellow looking which may or may not mean anything the part number is

    ( P521 ) which I ordered a couple of them

    https://www.ebay.com/itm/TLP521-1-Or...53.m2749.l2649

    I will see if I can bring it back to life or not or one of the ones that I bought on EBay

    I also bought a few of them off of EBAY I did not pay no more than $50.00 or is some cases less than $25.00 each the listing says that at least they power on

    The manufacturer of the machine wants $6000.00 ( plus installation ) for a up graded PLC that the tech support person that I have been dealing with him for years says to me this is not something you want to do your self because it might not be just plug and play some of the programming might need to be tweaked a little bit and you would have to have the programming hardware

    This power supply board has two 24 volt rail and one 5 volt rail

    I have one comment about the plastic cover for this PLC is the shit-est I have seen in a long time it is just breaking apart with very little force applied to it

    manufacturing data 2008
    Attached Files
    Last edited by sam_sam_sam; 10-05-2019, 07:43 PM.
    Tags: None
    • redwire
      Badcaps Legend
      • Dec 2010
      • 3907
      • Canada
      #2
      Re: Allen-Bradley SLC 500 PLC switching power supply dead

      I wouldn't expect a Japanese PSU design in Allen Bradley, this looks like Toshiba or Hitachi.

      I'd check under the heat sink (rivets?!) for any blown or old parts. Usually the snubber resistor and capacitor age pretty bad. D1, ZD1 check too. The IC is rated to 850V so what happened.

        Comment

        • sam_sam_sam
          Badcaps Legend
          • Jul 2011
          • 6039
          • USA
          #3
          Re: Allen-Bradley SLC 500 PLC switching power supply dead

          This is what I have to figure this out this why I ordered those two parts to see if the power supply comes back to life or not

          When I seen switching power supply do not want to turn ON most times for me it been that the switching regulator ic chip has been the problem or that the optic sensor has some type of issue of some sort

          There are no parts under the heat sink

          I have not check any of the resistor or diodes on this board yet but that might not be a bad idea to check them but nothing on this board jumps out at me to direct me to this part of the board for a problem

          But I did not see any resistors that look like they were running hot but that does not mean that they are good
          Last edited by sam_sam_sam; 10-06-2019, 05:40 PM.

            Comment

            • sam_sam_sam
              Badcaps Legend
              • Jul 2011
              • 6039
              • USA
              #4
              Re: Allen-Bradley SLC 500 PLC switching power supply dead

              Ok

              I tried to power up the power supply board that was in this machine and the fuse blew with a flash two amp fuse

              This does not look very good

              looks like the rectifier is shorted

              looks like the switching power regulator is shorted

              I will not know for sure until I remove these two items and see if I still have a short if it does then I will still have to remove parts until I get rid of short 8 ohm across the main filtering capacitor
              Last edited by sam_sam_sam; 10-11-2019, 10:48 PM.

                Comment

                • sam_sam_sam
                  Badcaps Legend
                  • Jul 2011
                  • 6039
                  • USA
                  #5
                  Re: Allen-Bradley SLC 500 PLC switching power supply dead

                  UpDate

                  The problem with this power was the MA1050 switching power regulator ic chip was shorted on the output pins to the transformer

                  Replace the switching power supply regulator ic chip and replace the optic sensor and the power supply came back to life

                  The bridge rectifier was ok it was not shorted but when I checked the main filtering capacitor it showed that it was shorted but it was the switching regulator ic chip that was shorted

                  Which is a good thing I now have a few good power supply for this PLC

                  It just me that I have to figure out what happened to this switching power supply to understand what happened to the PLC and I have come to the conclusion that when the switching power regulator went stupid it might have taken out the micro controller that controlled the PLC but like what was mentioned earlier may also be true that it might have taken a hit on the selector switch power supply ( which is a 24 volt half wave rectifier setup with filtering capacitors ) so who know what else has happened to the rest of the machine

                  I going to try to power up the machine with out the PLC to see what voltages I get for selector switches

                  I will let you know what I find out when I run this test
                  Last edited by sam_sam_sam; 10-12-2019, 04:41 PM.

                    Comment

                    • sam_sam_sam
                      Badcaps Legend
                      • Jul 2011
                      • 6039
                      • USA
                      #6
                      Re: Allen-Bradley SLC 500 PLC switching power supply dead

                      Update

                      On switching power supply

                      Recap it and ran it for at least 2 hours and ran with out any problems
                      Last edited by sam_sam_sam; 10-13-2019, 02:49 PM.

                        Comment

                        Previous template Next

                        Related Topics

                        Collapse
                        • sam_sam_sam
                          Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
                          by sam_sam_sam
                          I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

                          One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
                          03-31-2024, 02:12 PM
                        • sam_sam_sam
                          Modification to a ZD-987 desoldering/soldering station using a external switching power supply
                          by sam_sam_sam
                          I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails

                          I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time...
                          07-01-2024, 06:34 AM
                        • sam_sam_sam
                          Mitsubishi CNC switching power supply board dead / relay board bad diode failure
                          by sam_sam_sam
                          I was working on this CNC machine today found no keyboard functioning no control relay powering on
                          The screen powered on and was giving an operation error but the manual was not very clear about what the error exactly was but with a little bit of troubleshooting and finding out that the control relays not powering on and no keyboard functions we narrowed down to this one switching power supply which of course does not have any indicator LED light they are on the keyboard interface/relay controller board

                          Found shorted diodes on main controller relays there are 3 of them that...
                          01-07-2023, 05:43 PM
                        • sam_sam_sam
                          DVR camera recorder switching power supply capacitor failure really
                          by sam_sam_sam
                          These cheap non brand capacitors at it again

                          Last night we had a power outage [ long drawn out trying three to come back up before going out completely ] and when I went to turn the DVR camera recorder back today no go 3 bad capacitors ( one capacitor no ESR reading on DVR board the other 3 capacitor on the power supply board over 40 ohm this is not a misprint ) on the external switching power supply and one capacitor on the DVR camera recorder board where the power supply that goes to the hard drive disk is

                          Well at least I have the cameras back on line I to try the...
                          01-22-2022, 06:28 PM
                        • sam_sam_sam
                          Panasonic switching power supply daughter board has two 27uf @ 50 volt capacitors which I do not keep in stock
                          by sam_sam_sam
                          I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow

                          This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board

                          After all of...
                          07-13-2024, 08:14 PM
                        • Loading...
                        • No more items.
                        Working...