Omron R88D-KTA5L User Manual page 367

The corresponding external encoders for each output type are given in the following table.
Pn323
set External encoder type
value
90° phase difference
0
output type
Incremental encoder with
1
serial communications
2 Reserved (Do not use this setting.)
*1. These are the directions in which the Servo Drive counts the pulses from a 90°phase difference output
type external encoder.
Count-down direction
EXA
EXB
EXB is 90° ahead of EXA.
*2. These are the feedback speeds from the external encoder at which Servo Drive can respond.
Check the external encoder operation manual for its maximum output frequency.
For example, the maximum speed when an external encoder 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 encoder connection direction, set the rotation direction so that count-up occurs
when the motor shaft is rotating counterclockwise, and count-down occurs when the motor shaft
is rotating clockwise. 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 encoder count direction becomes opposite to the count direction
used for monitoring the total external encoder feedback pulses, etc.
If Pn000 = 0, the count direction matches the count direction for monitoring.
 Even when the speed command is within the Drive's speed command range, an acceleration error
will occur if the speed command exceeds the maximum speed of motor shaft rotation.
 To confirm that the installation direction is correct, use the front-panel monitor or the CX-Drive
monitor function to check the counting direction of the total external encoder feedback pulses and
the total encoder feedback pulses. If the counting directions are the same, the connections are
correct.
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
Corresponding external encoder
90° phase difference output type external
*1 encoder
Sony Manufacturing Systems Corporation
SR75, SR85
t1
t2
t1>0.25 μs
t2>1.0 μs
5-6 Fully-closed Control
examples
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 × 4)
0 to 400 Mpps
5-32
5