Did you ever get an answer to this question? Did you put this power supply into operation?
I'm looking for a PS for the G540. I'm considering this one, or the CNC RouterParts 48v/12.5a, or the Antek 48v unregulated with 5v and 12v outputs. I like it that the Keling 48v/12.5 unit has multiple outputs plus the Remote RC feature. Keling support informed me that the multiple outputs was not correct, but several people report that the 5v works or 12v works (apparently never both working). Maybe the 5v and 12v are not reliable, so Keling discounts them as not working.