Simulators typically have 2 crash modes. Recoverable and Unrecoverable crashes. The instructor can usually inhibit/reset recoverable ‘crashes’. Unrecoverable crashes usually result in the sim being set in Total Freeze.
Recoverable are typically:-
Excessive IAS
Excessive Mach
Excessive G
Taxi speed excessive
Touchdown speed excessive
Unrecoverable are typically:-
Excessive vertical speed below 50 ft
Excessive pitch below 50 ft
Excessive bank below 50 ft
Moving object collision
Terrain contact
The above varies according to sim manufacturer and customer requirements.