Fascinated by the pictures and specs of the RD, I ordered one on Banggood and am waiting for it to reach me.
I planned to use an Eltek (Delta) ESR48-15/A, which I have, as the input supply. This is a beautifully compact brick that fits the RD rather well in form and size, and can in fact drive two of them - (-) 54V, 14.8A. The thermo controlled fan will remain very quiet for the less-than-half load. And I hoped to work out a way of raising the voltage to 58+V, spec'd for the ESR.
But alas, it has unforeseen problems:
There are only six control connections (not quite pins, they take a PCB edge connector). Two are identified as PSON, need to be shorted to get going. All the others show under 3V to the PSON ground, which is linked to the main dc out + power line through 100R. 1k from ground to any pin does nothing.
I know there is a micro inside, and they expect to program the voltage setting by a dedicated control module. This is unobtanium.
Worse, the unit powers up to put out 42.0V, not the expected 54V. Starting 300 seconds on, it ramps up to 54.0, in a few seconds after, all by itself as default setting.
There is little one can do to the innards, it is extremely tightly packed, and given a tough conformal coating. So, must work via the six control pins.
I would be grateful for any suggestions.