Hello Harry, On both my machines, i'm only using the K1 relay.
First of all, with all the config switches off, the PMDX board will be in a no charge pump mode. If you want the charge pump on, "switch 1" ( of the PMDX config switches) is set to on. Then you would go to Mach Config->Ports and Pins-> Output signals...Enable the Charge pump box....should be port 1 and pin 17. Hit apply.
Now for the K1 relay, make sure the jumper ( JP1) on the pmdx board, is set to on pins 1&2. The K1 relay is controlled through port 1, pin #1. Now go to Mach Config-> Ports and Pins->Output Signals. Scroll down to the output boxes...pick an output not being used, 1 through 6.
In the "Pin Number" box of the output you picked, type in 1. Enable that output (green check mark). Hit apply.
While still in ports and pins, go to Spindle setup. In the Flood Mist Control box, on the left, un-check the Disable Flood/Mist relays box.
Now where it says "Flood M8 Output #", type in the output number you picked in "Output signals"...hit apply.
Your coolant pump should now start ether with the flood coolant button on the Mach screen, or with the M08 or M8 (which ever you prefer) command in code or on the MDI line.
Hope this gets you started
pete
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