Rockwell Automation Publication 750-UM006C-EN-P - March 2022 111
Configure and Start Up the Drive Chapter 4
Application Notes
This section provides an example of how to calibrate the a load side SSI
feedback, if utilized.
Example: For the universal feedback device, the 05:25 [FB0 Lin CPR]
calculation uses the data in the image.
Motor Encoder feedback = 4096 counts per motor revolution(1024 PPR)
X = motor encoder counts (P4 of incremental encoder feedback device)
Y = coded rail counts (P5 of UFB)
Example calculation for 05:25 [FB0 Lin CPR] of the universal feedback
device. CPR is the linear feedback counts per 1 motor revolution. By using the
incremental encoder feedback counts (04:04 [Enc 0 FB] of the single encoder
feedback device or 04:04 [Enc 0 FB] or 04:14 [Enc 1 FB] for the dual
encoder feedback device and the linear position feedback device 05:05 [FB0
Position].
Y1 = 1000, Y2 = 3000, X1 = 10,000, X2 = 85,000
Y2-Y1 = 2000 delta linear feedback counts
X2-X1 = 75,000 delta motor encoder counts
75,000/4096 = 18.3105 motor revolutions (as determined by motor encoder
revolutions) which calculates the Linear counts per motor revolution solve:
2000 linear delta feedback counts/18.3105 = 109.226 Linear counts/motor
rev. Because this value must be entered as an integer, Round off to 109, and
enter it into universal feedback device, 05:25 [FB0 Lin CPR]. This parameter
then correlates the position loops linear speed reference with the rotary speed
feedback of the motor.
Pallet ID Number:
range is 30,000 to
94,000
Lowest Linear
Absolute FB value 1
Example Y1 position
= 1000, X1 =10000
Example Y2 position
= 3000, X2 = 85000
Highest Linear
Absolute FB value =
6000
Pallet ID Number:
range is 30,000 to
94,000
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