Mitsubishi Electric Melservo-J4 Instruction Manual page 134

Description
The position deviates during
operation after home position
return.
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
132
1.6 Trouble which does not trigger alarm/warning
Cause
The position command and actual
machine position are different.
The position command and actual
machine position are different.
An alarm or warning is occurring.
The servo gain is low. Or the
response of auto tuning is low.
The reduction ratio is not
calculated correctly for the geared
servo motor.
The in-position range is too large.
Checkpoint
Check that "cumulative feedback
pulses × travel distance per pulse"
matches the actual machine
position.
Check if "cumulative feedback
pulses × feed length
multiplication" matches the actual
machine position.
Check that "cumulative feedback
pulses × travel distance per pulse"
matches the actual machine
position.
Check if "cumulative feedback
pulses × feed length
multiplication" matches the actual
machine position.
Check if an alarm or warning is
occurring.
Check if the trouble is solved by
increasing auto tuning response
([Pr. PA09]).
Check the following settings.
[A]:
Number of command input pulses
per revolution ([Pr. PA05]) or
electronic gear ([Pr. PA06] and
[Pr. PA07])
[B] [WB] [RJ010]:
Number of pulses per revolution,
travel distance (setting on the
controller side)
[GF]: Electronic gear ([Pr. PA06],
[Pr. PA07])
Check the setting of the in-
position range in [Pr. PA10].
Action
Review the position command
and electronic gear setting.
Review the position command
and electronic gear setting.
Check the content of the alarm/
warning and remove its cause.
Adjust gains.
Review the calculation of the
reduction ratio.
Set a narrower in-position range.
Target
[A]
[B]
[WB]
[RJ010]
[GF]