Omron OMNUC G5, Руководство пользователя, Страница: 295 / 550

5-28
5-6 Full Closing Control
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
5
BASIC CONTROL Mode
The corresponding scale for each output type is as follows.
*1. The driver count direction relative to the external scale of phase-AB output type is explained below.
*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
μ
m is used for the
serial communication type is 0.01
μ
m
×
(400
×
10
6
) pps = 4.00 m/s.
An overspeed error protection is generated, however, if the motor shaft rotation speed exceeds the
maximum speed.
Precautions for Correct Use
Œ
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).
Œ
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.
Œ
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.
Œ
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.
Pn323
set
value
External scale type Corresponding scale examples
Maximum input
frequency *
2
0
Phase-AB output type
*1
External scale of phase-AB output type 0 to 4 Mpps
(After quadruple
multiplier)
1
Serial communication type
(Incremental encoder
specifications) Sony Manufacturing Systems Corporation
SR75, SR85
0 to 400 Mpps
2
Serial communication type
(Absolute encoder
specifications) Mitutoyo Corporation
AT573, ST771A, ST773A
Sony Manufacturing Systems Corporation
SR77, SR87
0 to 400 Mpps
Count-down direction Count-up direction
EXB is 90
°
ahead of EXA.
t1
>
0.25
μ
s
t2
>
1.0
μ
s
t1
t2
EXA
EXB
EXB is 90
°
behind EXA.
t1
>
0.25
μ
s
t2
>
1.0
μ
s
t1
t2
EXA
EXB