ABB ACS880 N5700 Series - Overview

Motor revs = motor-side revolutions before gear ratio
Load units = load-side distance in rotary or linear movement
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Overview
The drawing below is an overview of the main items related to position feedback
scaling, depending on the location of the feedback device. The device can be
located on
• (A) the motor shaft,
• (B) the load shaft behind a gear, or
• (C) the load side behind the mechanical transmission.
ENC 2
ENC 1
Position
control
86.14
86.15
Load gear
86.16
86.17
Feed constant
86.18
86.19
Modulo range
86.02 Actual position
88.01 Position reference used
60
Load gear x Feed constant
86.21
86.22
Load encoder scale
Speed
control
Motor gear
90.43
90.44
24.02 Used speed feedback
M
A
BC
Feed unit = Load units / Load revs
Gear ratio = Motor revs / Load revs
Load units Load revs Motor revs
Position feedback
88.03 Speed reference positioning
Speed feedback
This table contains formulas for setting the actual position scaling in the three
configurations.
Load (C)Load shaft (B)Motor shaft (A)Feedback
Linear (rotary) en-
coder
Rotary encoderRotary encoder
111/Gear ratioLoad gear
Load units/Load en-
coder revs
Load units/Load revsLoad units/Load revsFeed constant
01 *Gear ratio *Modulo range
Position control program features 41