Increase scale allow me to found some point with 0v output for 0RPM 
resulting other value also affected (i think this is possible to tune the 
controller for make correct speed in both direction)

with 
PWM_PERIOD = 20000000
PWM_OUTPUT_SCALE = 121
isolator Zero to minimum

at full reverse (-55 on "motion.spindle-speed-out-rps") the 
"offset.pwmgen.out" pin is at 0, and your PWM is at ~0%,  or~1.1v    output 
-10.2v
at 0 speed (0 on "motion.spindle-speed-out-rps") the "offset.pwmgen.out" 
pin is at 55, and your PWM is at ~50% or~12.9v   output 0/-0.01v
at full forward(55 on "motion.spindle-speed-out-rps") the 
"offset.pwmgen.out" pin is at 110, and your PWM is at ~100% or~22.8  
 output 8.6v



Thanks for the suggestion about testing other output pin !!

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