Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 215)

Servo Parameters
Chapter 7
7-69
Range
1 to 32767
Notes
This parameter must be set independently for each servo.
When configuring any closed--loop axis you must configure two gear ratios
for feedback; one for velocity feedback, the other for position feedback.
On axes with a single feedback device, the setup and gear ratios should be
identical for position and velocity feedback since the same device is being
used for both feedback types.
Function
Use this parameter and the parameter Teeth on Motor Gear for Vel FB to
tell the control the gear ratio between the motor and velocity feedback
device. Typically the velocity feedback device is motor mounted.
Regardless of where the velocity feedback is mounted, use this parameter
in conjunction with Teeth on Motor Gear for Velocity Feedback to identify
the number of feedback device rotations that occur per revolution of the
ball screw. If the same feedback device is used for position feedback the
value entered here must be the same as the value entered for “Teeth on
Lead Screw for Position Feedback”.
In some cases there may be a series of gears or gearbelt pulleys that make
up a final gear ratio. In this case, it is necessary to factor this gear ratio
into this parameter and the parameter Teeth on Motor Gear
for Vel FB.
Refer to Figure 7.32 for an illustration of the mechanical configuration of a
typical axis.
Axis Parameter
Number
Axis Parameter
Number
(1) [1018] (7) [7018]
(2) [2018] (8) [8018]
(3) [3018] (9) [9018]
(4) [4018] (10) [10018]
(5) [5018] (11) [11018]
(6) [6018] (12) [12018]
Range
1 to 32767
7.3.6
Teeth on Lead Screw
for Velocity Feedback