Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 682

16. INDEXER POSITIONING OPERATION
Description
The servo motor Check if the servo-on is turned
starts rotating ON.
upon the power-
For a servo motor with an
on of the servo
electromagnetic brake, check the
amplifier, or the
timing of releasing the
servo motor
electromagnetic brake.
starts rotating
Check the servo motor power
upon servo-on.
cable.
The position A fixed amount (in one revolution)
deviates at the deviates. (Dog type home position
home position return)
return.
Check the in-position range
(parameter No.PA10).
Check if the proximity dog signal
is inputted correctly.
Check the installation of the
proximity dog switch.
Check the controller programs.
The position Check the servo alarm and
deviates during warning.
operation after
the home
The command position and
position return.
current 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.
Check method
Servo-on has been on at power-on.
1. The sequence of releasing the
electromagnetic brake is incorrect.
2. Failure of power supply for the
electromagnetic brake.
The output circuit is open phase.
Detection of a zero pulse is near dog off
position (Dog type home position return)
The in-position range is too large.
1. The proximity dog switch is faulty.
2. The installation of the proximity dog is
faulty.
The position of the proximity dog switch
is deviated , or installation of the
proximity dog is faulty.
The controller programs are incorrect.
1. A servo alarm occurred.
2. The servo motor coasted by the 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.
Temporary disconnection of the power
supply line
1. The servo gain is low.
2. The auto tuning response is low.
3. Settling time is slow.
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.
Possible cause
16 - 127
Action
Check the controller programs.
1. Check the sequence of releasing the
electromagnetic brake.
2. Check the power supply for the
electromagnetic brake.
Check the wiring of the servo motor
power cable.
Adjust the installation of the proximity
dog.
Set a narrower in-position range.
1. Repair or replace the proximity dog
switch.
2. Adjust the mounting of the proximity
dog switch.
Adjust the installation of the proximity
dog switch.
Check the controller programs.
Check the the alarm content, and
remove its cause.
Check 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
much noise, increase the setting
value of input filter setting
(parameter No.PD19).