Mitsubishi Electric MELSERVO MR-J4-B-RJ Series, Instruction Manual

Page: 45 / 174

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 38
Alarm No.: 27 Name: Initial magnetic pole detection error
Alarm content The initial magnetic pole detection was not completed properly.
Detail
No.
Detail name Cause Check method Check result Action Target
27.1 Magnetic pole
detection -
Abnormal
termination
(1) A moving part collided
against the machine.
Check if it collided. It collided. Move the start
position of the
magnetic pole
detection. [A]
[B]
[WB]
[GF]
It did not collided. Check (2).
(2) The wiring of the servo
motor power cable is
incorrect.
Check if the wiring of
the servo motor
power cable is
correct. It has a failure. Correct the wiring.
It has no failure. Check (3).
(3) The linear encoder
resolution setting
differs from the setting
value.
Check the setting of
[Pr. PL02] and [Pr.
PL03]. The setting is
incorrect. Set it correctly.
The setting is
correct. Check (4).
(4) The direction of
mounting linear
encoder is incorrect.
Check polarities of
the linear encoder
and the linear servo
motor. The mounting
direction is incorrect. Mount it correctly.
Review the "encoder
pulse count polarity
selection" setting of
the parameter as
required.
[A]: [Pr. PC45]
[B] [WB] [GF]:
[Pr. PC27]
The mounting
direction is correct.
Check (5).
(5) An excitation level of
the magnetic pole
detection voltage level
is small.
Check if the travel
distance during the
magnetic pole
detection is too short
(for a position
detection method). It is too short. Increase it with the
[Pr. PL09] setting.
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). The travel distance is
too long or a
vibration is occurring. Review the [Pr.
PL17] setting.
27.2 Magnetic pole
detection -
Time out error
(1) Servo-on was enabled
when the primary side
of linear servo motor or
rotor of direct drive
motor did not stop.
Check if servo-on was
enabled when the
motor did not stop. Servo-on was
enabled when the
motor did not stop. Stop the linear servo
motor and the direct
drive motor, and
enable servo-on
again.
Servo-on was
enabled when the
motor stopped.
Check (2).
(2) Only one of the limit
switches is on during
magnetic pole detection.
Check the limit
switches. It has a failure. Remove the cause.
Move the start
position of the
magnetic pole
detection.
It has no failure. Check (3).
(3) The magnetic pole
detection voltage level
is small.
Check if the travel
distance during the
magnetic pole
detection is too short
(for a position
detection method). It is too short. Increase it with the
[Pr. PL09] setting.