Mitsubishi Electric MELSERVO-J4 Instruction Manual page 60

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 42 Name: Servo control error (for linear servo motor and direct drive motor)
Alarm content
Detail
Detail name
No.
42.3 Servo control (1) The linear encoder
error by torque/
thrust deviation
(2) The direction of
(3) The connection of the
(4) The initial magnetic pole
(5) The torque/thrust
Alarm No.: 42 Name: Fully closed loop control error detection (during fully closed loop control)
Alarm content
Detail
Detail name
No.
42.8 Fully closed (1) The resolution of the
loop control
error by position
deviation
(2) The direction of
(3) The position deviation
A servo control error occurred.
Cause
Check the setting of
resolution setting differs [Pr. PL02] and [Pr.
from the setting value. PL03].
Check polarities of
mounting linear encoder the linear encoder
is incorrect. and the linear servo
motor.
Check the wiring.
servo motor is incorrect.
Execute the magnetic
detection was not pole detection, and
executed. then check the
repeatability.
Calculate the deviation
deviation exceeded the between the current
detection level. command and
torque/thrust.
A fully closed loop control error has occurred.
Cause
Check the setting of
load-side encoder [Pr. PE04] and [Pr.
setting differs from the PE05].
setting value.
Check the mounting
mounting load-side direction of the load-
encoder is incorrect. side encoder.
Check the value of
exceeded the detection droop pulses.
level.
Check method Check result
The setting is
incorrect.
The setting is
correct.
The mounting
direction is incorrect.
The mounting
direction is correct.
The wiring is
incorrect.
The wiring is correct. Check (4).
It is not repeatable.
It is repeatable.
The deviation is
large.
Check method Check result
The setting is
incorrect.
The setting is
correct.
The mounting
direction is incorrect.
The mounting
direction is correct.
The deviation is
large.
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Action Target
Set it correctly. [A]
[B]
[WB]
Check (2).
[GF]
Mount it correctly.
Review the "encoder
pulse count polarity
selection" setting of
the parameter as
required.
[A]: [Pr. PC45]
[B] [WB] [GF]:
[Pr. PC27]
Check (3).
Connect it correctly.
Execute the
magnetic pole
detection.
Check (5).
Review the operation
status. Review the
[Pr. PL07] setting
depending on
circumstances.
Action Target
Set it correctly. [A]
[B]
[WB]
Check (2).
[GF]
Mount it correctly.
Review the "encoder
pulse count polarity
selection" setting of
the parameter as
required.
[A]: [Pr. PC45]
[B] [WB] [GF]:
[Pr. PC27]
Check (3).
Review the operation
status. Review the
[Pr. PE07] setting
depending on
circumstances.