
Title 9083 / 9087 / 90A3 / 90A7
Learning Control Operator’s Manual
03 '00.06.07 N.Sonoda Qualified 2'nd issue Draw No.
02 ’99.01.14 K.Maeda Qualified 1’st issue
A - 63639E - 034
01 ’97.12.08 K.Maeda Newly designed Sheet 045
Edit Date Design Description / 070
7.4.5 Cautions
1) Rotation direction of Rotary encoder
• Because the signal from Rotary encoder is used as the velocity feedback, connect the A-phase and B-
phase as
positive feedback returns when Rotary encoder rotates the CCW (Counter Clock-wise) direction
from view of Motor shaft side. You can make sure the
positive feedback by means that the diagnostic
screen No.300 Servo error shows the
negative value when you rotate CCW the motor shaft by hand
without the excitation.
Note) In order to stop the motor if you mistake signal connection, set No.2200#0 to 0 at initial setting to
enable the motor runaway detection. If the signal connection is right, set No.2200#0 to 1.
Note) In case of full-closed (No.1815#1 = 1), Signal can be reversed by setting No.2018#0 to 1.
2) Limit of rotation speed
• The limit of Rotary encoder RON8xx is 300 min
-1
.
• When you drive motor by G05, Rotation speed is limited to 65536000 pulses/sec for 0.5 msec velocity loop.
If 18000000 pulses/rev, the maximum speed is 218 min
-1
.
In case of 1msec velocity loop, the maximum speed is a half of above, that is 109 min
-1
.
3) Installation of Rotary encoder
As this function takes in velocity feedback from Rotary encoder, it is very important for you to install it
directly on motor shaft from view point of stability.
4) Setting for High precision serial output circuit
The Jumper pin in High precision serial output circuit is set to “A” at shipment from the factory. When you
use this circuit, you need to change this jumper pin to “B”.
Refer to “High precision serial output circuit manual” (A-56731-0079)
5) Reference point return
This function is usually in rotary axis possible to rotate only a direction by user program. As far as you keep
to control the position by using G00, G01, or G05 command, this have no problem. If you used PMC
velocity command switching from the position control mode, you might experience the position gap different
from right position after the zero return. This is because servo software can not support the feedback not
having 2 to n’th power slit in the rotary encoder such as RONxx.
At the present system,
don’t use PMC velocity command with this function.