How to activate AC200L 48 volt output

I have an AC200L unit with the 48 volt output. I have purchased the appropriate connector and made a cable. How do I output the 48 volts (I can use my own step down converter)? Each time I try to draw a load, the current stops. Since there is no available D40 can you at least let us know how to use the port for direct 48 volt access?

@Scott-Benson
Did your AC200L report any errors? It needs to be determined whether AC200L protects or your device caused it to stop outputting.