Installation manual
CNC 8055
CNC 8055i
CONCEPTS
7.
SOFT: V02.2X
·397·
Gear ratio management on axes and spindle
7.19.3 Example of axes: external encoder with gear ratio
In this case, on linear axes the encoder is connected to the leadscrew through a gear box and on
rotary axes, it is connected to the center of rotation through a gear box.
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 encoder is an HOP model (Vpp) and provides
18,000 pulses per turn and a 2-to-3 gear ratio.
Sercos axes
1. External feedback device connected to the drive (second feedback)
Axis parameter DRIBUSLE (P63) = 2.
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.
Parameters involved in the calculation of the position feedback:
GP10 (drive) = feedback type of the external encoder = 2.
PP115 (drive) = bit 0 = 0 (direct external rotary feedback).
NP117 (drive) = number of pulses per turn of the external encoder = 18000.
NP131 (drive) = input revolutions of the external encoder = 2.
NP132 (drive) = output revolutions of the external encoder = 3.
NP133 (drive) = Leadscrew pitch = 20.
NP165 (drive) = 1001 (see table of the drive manual).
NP166 (drive) = 1000 (see table of the drive manual).
MOTOR
ENCODER
TABLE
LEADSCRE
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