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

Page: 46 / 174

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1 - 39
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
27.3 Magnetic pole
detection -
Limit switch
error
(1) Both of the limit
switches are off during
the magnetic pole
detection.
Check the limit
switches. Both of them are off. Turn on the limit
switches.
When using a direct
drive motor, also
check (2).
[A]
[B]
[WB]
[GF]
(2) When using a direct
drive motor in a system
where the motor
rotates one revolution
or more, the following
stroke limit signals are
not enabled with a
parameter.
[A]: LSP and LSN
[B] [WB]: FLS and RLS
[GF]: LSP and LSN
(FLS and RLS from the
controller)
Check the [Pr. PL08]
setting. The [Pr. PL08]
setting is "_ 0 _ _". Set the [Pr. PL08]
setting to "_ 1 _ _".
27.4 Magnetic pole
detection -
Estimated error
Check it with the check method for [AL. 27.1].
27.5 Magnetic pole
detection -
Position
deviation error
27.6 Magnetic pole
detection -
Speed deviation
error
27.7 Magnetic pole
detection -
Current error
Alarm No.: 28 Name: Linear encoder error 2
Alarm content Working environment of linear encoder is not normal.
Detail
No.
Detail name Cause Check method Check result Action Target
28.1 Linear encoder
- Environment
error
(1) The ambient
temperature of the
linear encoder is out of
specifications.
Check the ambient
temperature of the
linear encoder. It is out of
specifications. Lower the
temperature.
Contact the linear
encoder
manufacturer. [A]
[B]
[WB]
[GF]
It is within
specifications. Check (2).
(2) The signal level of the
linear encoder has
dropped.
Check the mounting
condition of the linear
encoder. It has a failure. Correct the mounting
method of the linear
encoder.