F7901

Dear all,

I have a problem,when the motor in running,sometimes the S120 drive happen a fault:F7901.

But i monitor the r60(speed setpoint) and r63(actual speed) is almost the same 1500 rpm.

The speed positive and negative limit speed is 3000rpm and -3000rpm.

and the tolerence P2162 is 180rpm.

What is the problem.

And i want disable this speed monitor function, how can i do.

Good evening 

i have the same fault F7901 but my question could you help me how can i verify the r1084 and change it is small