Omron R88D-KT Series User Manual

8-35
8-4 Analog Control Parameters
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
8
Parameter Details
Explanation of Set Values
*1. These are the directions in which the Servo Drive counts the pulses from a 90° phase difference
output type external encoder.
 For the external encoder connection direction, set the 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.
 Check the number of encoder pulses per motor rotation and number of external encoder pulses
per motor rotation, and set External Feedback Pulse Dividing Numerator (Pn324) and External
Feedback Pulse Dividing Denominator (Pn325).
If this ratio is incorrect, the deviation between the position calculated from encoder pulses and
position calculated from external encoder pulses will increase. Particularly when the moving
distance is long, an excessive deviation error will occur.
Set Pn324 to 0 to have encoder resolution automatically set as numerator.
Set value Description
0
90° phase difference output type *
1
1 Incremental encoder with serial communications
2 Reserved (Do not use this setting.)
Count-down direction Count-up direction
EXB is 90° ahead of EXA.
t1 > 0.25 μs
t2 > 1.0 μs
EXB is 90° behind EXA.
t1 > 0.25 μs
t2 > 1.0 μs
t1
t2
t1
t2
EXA
EXB
EXA
EXB
Pn324
External Feedback Pulse Dividing Numerator
Setting
range
0 to 2
20
Unit −
Default
setting
0
Power OFF
and ON
Yes
Fully-closed
Pn325
External Feedback Pulse Dividing Denominator
Setting
range
1 to 2
20
Unit −
Default
setting
10000
Power OFF
and ON
Yes
Fully-closed
=
Encoder resolution per motor rotation [pulses]
External encoder resolution per motor rotation [pulses]
Pn324
Pn325
Pn326
External Feedback Pulse Direction Switching
Setting
range
0 or 1 Unit −
Default
setting
0
Power OFF
and ON
Yes
Fully-closed

Omron R88D-KT Series Specifications

General

Brand	Omron
Model	R88D-KT Series
Category	Servo Drives
Language	English