User manual of EL8-EC***F AC Servo
231
Steps:
1
、
Set the trial run velocity
Pr6.04
. Value set shouldn’t be too large, please keep it at
around
400 r/min
.
2
、
Enter
AF_GL
for auxiliary function – Inertia ratio determination into front panel
3
、
Press S once to enter. “
G---
” will be displayed on the front panel.
4
、
Press
once to display “
StUon
”
5
、
Press
or
once to start to calculate the inertia.
6
、
After the calculation is done, G
xxx
will be displayed and
xxx
is the value of inertia
calculated.
7
、
Write the corresponding value into Pr0.04. Please refer to for parameter saving on
servo driver.
Inertia measuring using Motion Studio
1. Start Motion Studio and maneuver to inertia measuring page under performance tuning.
Set trial run velocity Pr6.04 and acc-/deceleration time Pr6.25, click on ‘Upload’ to
upload parameters to servo driver.
2. Tick “Prohibit external enabling” and click on “servo on”.
3. Click and hold “CCW” to start the motor. Current position will show motor cycles of
revolution. Click on POS 1 to save current position as starting point. Click and hold “CW”
to start the motor again. Click on POS 2 to save current position as ending point.
4. Set the waiting time between each cycle in Pr6.21 and no. of cycles in Pr6.22. Click on
‘Run’ and motor will run according to the parameters set.
5. After the calculation is done, inertia ratio will be calculated automatically and click on
‘write’ to enter the calculated value into Pr0.04.
6. Click on “
” to enter parameters management to check or modify Pr0.04. Then, click
on “
” to save parameters to driver.
Please take note:
1. Trial run velocity and distance should be optimal to prevent any axis from bumping into
objects.
2. It is recommended to move only in 1 direction for vertically mounted axis. Take
precaution before moving the axis.
3. For applications with higher frictional drag, please set a minimal travel distance.
Pr0.04
Name
Inertia ratio
Mode
F
Range
0~2000
0
Unit
%
Default
250
Index
2004h
Activation
Immediate
Pr0.04=( load inertia/motor rotational inertia)×100
%
Notice:
Set inertia ratio according to actual load inertia. When both are uniform, actual motor velocity loop
responsiveness and gain settings will be consistent. If inertia ratio is greater than actual value,
velocity loop gain settings will be higher and vice versa.
