Fagor CNC 8055i FL EN - Example of Axes: Encoder in the Motor

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Installation manual
CNC 8055
CNC 8055i
7.
CONCEPTS
SOFT: V02.2X
Gear ratio management on axes and spindle
7.19.1 Example of axes: encoder in the motor
We have an axis with a maximum feedrate of 20 m/min, with a leadscrew pitch of 20 and a 3-to-1
gear ratio between the motor and the leadscrew. The motor encoder provides 2500 pulses per turn.
Sercos / CAN axes
 Axis parameter DRIBUSLE (P63) = 1.
Parameters involved in the calculation of the velocity command:
 Axis parameter G00FEED (P38) = Maximum feedrate of the axis = 20000.
 Axis parameter PITCHB (P86) = Leadscrew pitch = 20.
 Motor gear ratio:
axis parameter INPREV (P87) = Input revolutions =3.
axis parameter OUTPREV (P88) = Output revolutions = 1.
 NP121 (drive) = it automatically loads the value of axis parameter INPREV (P87) of the CNC.
 NP122 (drive) = it automatically loads the value of axis parameter OUTPREV (P88) of the
CNC.
 NP123 (drive) = it automatically loads the value of axis parameter PITCHB (P86) of the CNC.
Calculation of maximum motor speed for a feedrate of G00FEED:
Maximum motor speed = (G00FEED x INPREV) / (PITCHB x OUTPREV)
= (20000 x 3) / (20 x 1) = 3000 rpm.
Analog axes
Parameters involved in the calculation of the velocity command:
 Axis parameter G00FEED (P38) = Maximum feedrate of the axis = 20000.
Parameters involved in the calculation of the position feedback.
 axis parameter NPULSES (P8) = number of pulses per turn of the encoder = 2500.
 Axis parameter PITCHB (P86) = Leadscrew pitch = 20.
 Motor gear ratio:
axis parameter INPREV (P87) = Input revolutions =3.
axis parameter OUTPREV (P88) = Output revolutions = 1.
MOTOR
ENCODER
TABLE
LEADSCRE