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Motorola R1011B power supply problems

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Jun 3, 2014
Skidmore, TX
I have two Motorola R1011B power supplies, one I used for bench work at my place of employment for almost 30 years before it was retired and the other one I picked up along the way, both have the same issue, they will run along fine then just trip off (could be 5 min or 24 hrs) These have the ability to "remotely" (for lack of a better term) trip the breaker, I am sure they are not tripping off due to high current but rather some type of error detected by the control circuits, I have noticed that the output voltage does not seem to be real stable when there is no load and they only trip off under no/low load. I think I read somewhere that these were built by General Dynamics not Motorola, does anyone have a manual or other information about these power supplies, they are BTW quite B.A. up to 40V/40A and quite heavy. Also other than the tripping off issue and the small wavering in output voltage all the controls seem to work as they should..
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