Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting page 40

1. TROUBLESHOOTING
Alarm No.: 42 Name: Servo control error
Alarm content
Detail
Detail name
No.
42.1 Servo control (1)
error by
position
deviation
(2)
(3)
(4)
(5) The position deviation
A servo control error occurred.
Cause
The linear encoder Check the setting of
resolution setting differs [Pr. PL02] and [Pr.
from the setting value. PL03].
The direction of Check polarities of the
mounting linear encoder linear encoder and the
is incorrect. linear servo motor.
The connection of the Check the wiring.
servo motor is incorrect.
The initial magnetic pole Execute the magnetic
detection was not pole detection, and
executed. then check the
repeatability.
Check the value of
exceeded the detection droop pulses.
level.
Check method Check result
The setting is
incorrect.
The setting is correct. Check (2).
The mounting
direction is incorrect.
The mounting
direction is correct.
The wiring is
incorrect.
The wiring is correct.
It is not repeatable.
It is repeatable.
The deviation is large. Review the operation
1 - 33
Action Target
Set it correctly. [A]
[B]
[WB]
Mount it correctly.
Review the "encoder
pulse count polarity
selection" setting of
the parameter as
required.
[A]: [Pr. PC45]
[B] [WB]: [Pr. PC27]
Check (3).
Connect it correctly.
Check (4).
Execute the magnetic
pole detection.
Check (5).
status. Review the
[Pr. PL05] setting
depending on
circumstances.