Yaskawa Sigma-5 User Manual: Setup for Linear Motors - Manual (Page 53)

2.3 Linear Scale Installation and Adjustment
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2
Installation
2.3.2 Installation
Install the linear scale so that the linear servomotor forward direction and linear scale
count up direction are the same.
When using Σ-V series linear servomotors, the linear servomotor forward direction
(moving coil’s movement direction when current flows through phases U, V, and W,
in that order) is toward the side from which the linear servomotor main circuit cable
is extended. The analog 1-V p-p voltage input from the incremental linear scale to the
serial converter unit is counted during phase A (cos signal) progression.
Note: When the direction of the linear servomotor and the direction in which the linear scale
counts pulses are reversed because of wiring or other factors, set the parameter
Pn080.1=1 (Sets phase B lead as phase sequence of U, V, W).
If the linear servomotor forward direction and linear scale count up
direction do not match and the linear servomotor is run in this state,
the linear servomotor may not operate or may overrun.
Motor forward direction (U to
V to W)
Phase A progression
(pulse increase)
Moving coil cable
Phase B progression
(pulse decrease)
−
+