Rockwell Automation Allen-Bradley Kinetix 5100 - Page 173

Rockwell Automation Publication 2198-UM004D-EN-P - December 2022 173
Chapter 7 Configure the Drive with KNX5100C Software
Setting Gear Ratio Master Counts (ID152, P1.045) - Using any other Positioning Mode
The Gear ratio Master Counts (Figure 81) parameter is sometimes called the
denominator, which by default is defined as 100,000 counts/motor rev.
The Master counts value is desired counts/motor rotation. So, this Master
counts value is used to set the 'position scaling' for your axis. The value can be
any encoder count value that can be converted to give you your position units/
motor rotation, which includes your mechanical transmission.
For example:
The ball screw pitch is 3 mm, when using a 4 bit encoder, if the E-Gear ratio is
set to 16777216/3000, then the workpiece moves 1 μm per 1 pulse command.
You can create Position Units in the Logix environment by using the Device Object
Handler Add-On Instruction
IMPORTANT When you change the E-Gearing ratio, you are affecting the position
scaling of your drive. So, you cannot expect to position correctly after
you have changed the E-Gear ratio. You must first re-establish a home,
then set the E-Gear ratio correctly for your Position units.
E-Gear Status Gear Ratio Moving Distance per 1 Pulse Command
E-Gear is not applied
E-Gear is applied
Motor
Platform
Workpiece
Ball screw pitch:
3 mm = 3000 µm
1
=
1
1
1
(Unit: )
rev
µm
pulse
µm
rev
pulse
= =x
16777216
3000
16777216
3000
=
3000
16777216
1
(Unit: )
rev
µm
pulse
µm
rev
pulse
= =x
16777216
3000
3000
16777216