Mitsubishi Electric MELSERVO-J4 Instruction Manual page 45

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 27 Name: Initial magnetic pole detection error
Alarm content
Detail
Detail name
No.
27.1 Magnetic pole (1) A moving part collided
detection -
Abnormal
termination
(2) The wiring of the servo
(3) The linear encoder
(4) The direction of
(5) An excitation level of
27.2 Magnetic pole (1) Servo-on was enabled
detection -
Time out error
(2) Only one of the limit
(3) The magnetic pole
The initial magnetic pole detection was not completed properly.
Cause
Check if it collided.
against the machine.
Check if the wiring of
motor power cable is the servo motor
incorrect. power cable is
correct.
Check the setting of
resolution setting [Pr. PL02] and [Pr.
differs from the setting PL03].
value.
Check polarities of
mounting linear the linear encoder
encoder is incorrect. and the linear servo
motor.
Check if the travel
the magnetic pole distance during the
detection voltage level magnetic pole
is small. detection is too short
(for a position
detection method).
Check if the travel
distance during the
magnetic pole
detection is too long
or if a vibration is
occurring (for a
minute position
detection method).
Check if servo-on was
when the primary side
enabled when the
of linear servo motor or motor did not stop.
rotor of direct drive
motor did not stop.
Check the limit
switches is on during switches.
magnetic pole detection.
Check if the travel
detection voltage level distance during the
is small. magnetic pole
detection is too short
(for a position
detection method).
Check method Check result
It collided.
It did not collided.
It has a failure.
It has no failure.
The setting is
incorrect.
The setting is
correct.
The mounting
direction is incorrect.
The mounting
direction is correct.
It is too short.
The travel distance is
too long or a
vibration is occurring.
Servo-on was
enabled when the
motor did not stop.
Servo-on was
enabled when the
motor stopped.
It has a failure.
It has no failure.
It is too short.
1 - 38
Action Target
Move the start [A]
position of the [B]
magnetic pole [WB]
detection. [GF]
Check (2).
Correct the wiring.
Check (3).
Set it correctly.
Check (4).
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 (5).
Increase it with the
[Pr. PL09] setting.
Review the [Pr.
PL17] setting.
Stop the linear servo
motor and the direct
drive motor, and
enable servo-on
again.
Check (2).
Remove the cause.
Move the start
position of the
magnetic pole
detection.
Check (3).
Increase it with the
[Pr. PL09] setting.