I’ve wired up a relay to control coolant flow to a water cooled spindle on my Altmill but found that the output is reversed e.g. M8 turns coolant off and M9 turns it on. When the machine first boots up, there is 4 volts at the connector on the SLB and the relay is triggered. I’d assume that there should be no voltage at the output unless the M8 command is run or the coolant is manually turned on in Gsender. Any ideas? It seems like there may be a way to change the output defaults in the firmware but I don’t want to start changing things around without knowing what I’m doing… Thanks for any guidance!
There is a gsender SLB-EXT settings/config item for this - some applications require active-high, others inverted as active-low…
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I figured it was something like that. Turns out I was looking at the wrong setting tab in gsender. It was under “Other settings” - $15 value changed and now it works! Thanks for pushing me in the right direction.
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