its the first I have read of a G540 having burnt connectors but
Phoenix Contact connectors burning up are found on a number of threads
like this on a Tormach machine's Leadshine 3ND883 or Tormach driver 31234
examples of burnt connector
the problem can be found with any product using this connector
see post 13
https://www.cnczone.com/forums/torma...-toilet-2.html
one possible solution if you don't send the G540 back to Geckodrive could be to solder a wire directly to the board
from another cnczone post
https://www.cnczone.com/forums/torma...connector.html
John