Omron OMNUC G5 User Manual page 295

The corresponding scale for each output type is as follows.
Pn323
set External scale type
value
Phase-AB output type
0
Serial communication type
1 (Incremental encoder
specifications)
Serial communication type
(Absolute encoder
2
specifications)
*1. The driver count direction relative to the external scale of phase-AB output type is explained below.
Count-down direction
EXA
EXB
EXB is 90° ahead of EXA.
*2. These are the feedback speeds from the external scale at which Servo Drive can respond.
Check the external scale operation manual for its maximum output frequency.
For example, the maximum speed when an external scale with a resolution of 0.01 μm is used for the
serial communication type is 0.01 μm × (400 × 10
An overspeed error protection is generated, however, if the motor shaft rotation speed exceeds the
maximum speed.
Precautions for Correct Use
For the external scale connection direction, set the rotation direction so that count-up occurs when
the motor shaft is rotating in the CCW direction, and count-down occurs when the motor shaft is
rotating in the CW direction. If the connection direction cannot be selected due to installation
conditions, etc., the count direction can be reversed using External Feedback Pulse Direction
Switching (Pn326).
Take note that if Pn000 = 1, the scale count direction becomes opposite to the count direction
used for monitoring the total external scale feedback pulses, etc.
If Pn000 = 0, the count direction matches the count direction for monitoring.
Even when the driver speed is within the specified range, an acceleration error will occur if the
motor shaft rotation speed exceeds the maximum speed.
To check the installation direction, use the front panel monitor or the monitoring function of CX-
Drive and check the count directions of the external scale total feedback pulses and the encoder
total feedback pulses. If they match, the connection is set up correctly.
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
Corresponding scale examples
*1
External scale of phase-AB output type
Sony Manufacturing Systems Corporation
SR75, SR85
Mitutoyo Corporation
AT573, ST771A, ST773A
Sony Manufacturing Systems Corporation
SR77, SR87
t1
t2
t1>0.25 μs
t2>1.0 μs
5-6 Full Closing Control
Count-up direction
t1
EXA
EXB
t2
EXB is 90° behind EXA.
t1>0.25 μs
t2>1.0 μs
6
) pps = 4.00 m/s.
Maximum input
2
frequency *
0 to 4 Mpps
(After quadruple
multiplier)
0 to 400 Mpps
0 to 400 Mpps
5
5-28