The spindle control is MTB dependant, many will drop all power when an emergency stop is issued, this does not allow a controlled stop of the spindle through the Sp Drive, so the motor just coasts to a stop.
The thermal dectection is usually a thermal switch buried in the Motor windings or case and should normally read a closed condition, it will open circuit when exposed to a certain heat level.
A resistance meter with confirm the status.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.