Feedback Pulses; Cw And Ccw - Omron CS1W-MC221 - 02-2008 Operation Manual

Control System Configuration and Principles
1-4-2

Feedback Pulses

Forward Rotation (Positive Speed Reference)
Reverse Rotation (Negative Speed Reference)
1-4-3

CW and CCW

CW (Clockwise)
CCW (Counterclockwise)
Standard OMRON Servomotors are designed for an advanced phase-A for
forward rotation and an advanced phase-B for reverse rotation. The MC Unit
is designed to comply with this phase advancement, allowing OMRON Driver
Connecting Cables to be connected without modification.
Phase A
Phase B
Phase A
Phase B
When using Servomotors by other manufacturers, check carefully the encoder
specifications. If the definition differs from the ones given above, take one of
the following actions:
• Reverse the phase-B wiring between the MC Unit and the servo driver.
(Reverse the +B terminal and the –B terminal.)
• Set the machine parameter "encoder polarity" in the system parameters
to "reverse rotation for encoder increase." It is initially set to the "forward
rotation at the encoder increase."
The abbreviations "CW" and "CCW" used in this manual to describe the oper-
ation of the MC Unit are defined as follows:
Clockwise is the direction in which the present position increases.
Negative limit
Counterclockwise is the direction in which the present position decreases.
Negative limit
CW
CCW
Section 1-4
Positive limit
Positive limit
15