angle and provides corrective action to automatically change the position of the floor cutter to impact the pitch angle of the shearer 300 the controller 384 may also monitor and control other operations and or characteristics of the shearer 300 such as for example the speed of the cutters 335 340 the roll angle the position of the cutters 335 340 independent of the pitch of the shearer 300 and the like although fig1 illustrates pitch angle thresholds that are both positive values in some embodiments one or both of the pitch threshold is are negative e g u2212 5 u00b0 with reference to the comparisons between the current pitch angle 500 and the pitch angle thresholds 516 520 u201c exceeding u201d means greater than or means greater than or equal to and u201c below u201d means less than or means less than or equal to the extraction system 100 also includes a health monitoring system 400 that monitors general operation of the longwall system 200 as shown in fig1 the health monitoring system 400 includes longwall control system 405 a surface computer 410 a network switch 415 a monitoring system 420 and a service center 425 in the illustrated embodiment the longwall control systems 405 are located at the mine site the longwall control system 405 includes various components and.