Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 382

11. TROUBLESHOOTING
Description
The position Check the installation of the
deviates at the proximity dog switch.
home position
return.
Check the controller programs.
The position Check the servo alarm or
deviates during warning.
operation after
the home
The command position and urrent
position return.
position do not match.
"Cumulative feedback pulses ×
feed length multiplication" does
not match the actual machine
position.
Cumulative feedback pulses does
not match "Cumulative command
pulses × electronic gear setting"
value.
1. If the servo motor can be driven
safely, repeat acceleration and
deceleration three times or
more to complete auto tuning.
2. Increase the auto tuning
response (parameter
No.PA09). (Except for the
manual mode)
For the geared servo motor,
check the setting of the electronic
gear (parameter No.PA06, PA07).
Check the point table setting,
selection, start timing, etc.
Check method
The position of the proximity dog is
deviated, or installation of the proximity
dog is faulty.
The controller programs are incorrect.
1. A servo alarm occurred.
2. The servo motor coasts due to servo
alarm.
Forward rotation stroke end (LSP) or
reverse rotation stroke end (LSN) was
turned off. (A99 occurred).
1. A mechanical slip occurred.
2. The backlash of the machine part is
large.
The power line was disconnected
temporarily.
1. The servo gain is low.
2. The auto tuning response is low.
3. Settling time is delayed.
1.Forward rotation stroke end (LSP) or
reverse rotation stroke end (LSN)
was turned off. (A99 occurred)
2. Clear (CR) and reset (RES) were
turned ON.
The auto tuning response is low.
The reduction ratio is not calculated
correctly.
The setting of point tables and start
timing is incorrect.
Possible cause
11 - 25
Action
Adjust the installation of the proximity
dog switch.
Review the controller programs.
Check the alarm content, and remove
its cause.
Review the wiring of forward rotation
stroke end (LSP) and reverse rotation
stroke end (LSN).
Adjust the machine part.
Review the wiring.
Increase the auto tuning response, and
readjust the gain.
(Refer to chapter 9.)
1. Review the wiring and sequence of
each signal.
2. Review the controller programs.
3. If a malfunction may occur due to
loud noise, increase the input filter
setting (parameter No.PD19).
Increase the auto tuning response, and
readjust the gain. (Refer to chapter 9.)
Review the setting of the reduction
ratio.
1. Review the point table setting.
2. Review the controller programs.