Last night I was cutting with my Ox which uses a control board and

General CNC CNC Routers
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@cmcgrath5035 Also, please explain your slow death of my PWM controller comment?

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Also, please explain your slow death of my PWM controller comment? <<
Only a guess on my part. IF the SPWM output from tinyG is low, then the input side of the PWM controller SHOULD BE low and the spindle NOT running. BUT the spindle kept running until the fuse is blown.
Your results replacing the fuse will reveal if the PWM Controller still sort of works.

Your Emergency stop wiring sounds typical and should not be an issue, with a couple possible exceptions.

How does (did) the tinyG PWM lead connect to the PWM controller? Wire from tinyG_SPWM to PWM_IN+, with PWM_IN- grounded?

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Does it work if you set these?

$p1cpl=0
$p1cph=1