Table of Contents
Advertisement
MCO351 Positioning Controller
6. Troubleshooting
Illustration 6.1: Derivation of quad counts
6
Absolute value encoder
This is a special form of encoder, as it indicates not only the speed and direction of rotation but
also the absolute physical position. This is communicated via transfer of the position in parallel
form or in the form of a telegram in serial form. Absolute value encoders also come in two versions:
Single-Turn encoders supply an absolute position via a specific quantity, or via a freely-definable
number of rotations.
ERPM
The speed is defined in relation to the RPM of the encoder. To underline this the term "encoder
revolutions per minute" is chosen as unit.
AMA
Automatic Motor Adaptation - function in P129.
Motor/encoder gear ratio
Since the encoder is not necessarily mounted on the motor itself, the relationship between the
nominal motor speed in RPM and the nominal encoder speed in ERPM must be specified.
Track error
The PID track error is defined as the difference between the internal controller set-point and the
actual position. The track error is specified in UU and is displayed in P3456.NOTE! The maximum
tolerated PID error is entered in P3267 in QC.
45
MG.33.R1.02 - VLT
®
is a registered Danfoss trademark
Advertisement
Table of Contents
