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6. TROUBLESHOOTING
6 TROUBLESHOOTING
6.1 Alarm list
The following protective functions are the alarms that differ from those of the standard model.
For the other alarms, refer to the MELSERVO-J2S-B Specifications and Installation Guide and
Instruction Manual since they are the same as those of the standard model.
Indication Name Definition Occurrence Factor Corrective Action
The linear scale temperature is high.
(Mitutoyo make linear scale)
Check the linear scale
temperature and contact
the scale manufacturer.
AL28 Full closed
encoder error 2
Linear scale operating
environment was abnormal.
Reduction of linear scale signal level
(Sony Precision Technology make
linear encoder)
Check the mounting state
of the linear scale.
Full closed encoder fault Contact the full closed
encoder manufacturer.
Linear scale alarm Confirm the detailed
information given in
Section 6.2 and contact
the scale manufacturer.
The linear scale speed exceeded the
specification range.
Use the linear scale at the
speed within the
specification range.
Linear scale and detection head
mounting position error
Adjust the linear scale
and detection head
mounting positions.
Noise entry Take noise reduction
measures.
Contact the full closed
encoder manufacturer.
The MR-J2S-CLP01 connector CN1A
is disconnected.
Connect it correctly.
AL2A Full closed
encoder error 1
Full closed encoder (linear
scale or ABZ phase pulse-
specified encoder) is faulty.
ALM output of the full closed
encoder (when ALM output detection
is valid in parameter No. 62)
Change the full closed
encoder.
Full closed encoder failure Change the full closed
encoder.
The polarity of the full closed
encoder is set oppositely.
Check the mounting
orientation of the full
closed encoder.
Reexamine the setting of
parameter No. 62.
AL42 Full closed
control error
detection
The setting of the full closed encoder
electronic gear is wrong.
Reexamine the settings of
parameter No. 65, 66.
Check the mounting state
of the full closed encoder.
Full closed control error
detection function was
activated.
1) The difference between the
F/B speed of the full closed
encoder and the F/B speed
of the motor end encoder
reached or exceeded the
setting of Pr. 63.
2) The motor shaft-equivalent
difference between the F/B
position of the full closed
encoder and the F/B position
of the motor end encoder
reached or exceeded the
setting of Pr. 64.
The resolution setting for the full
closed encoder is incorrect.
Set the resolution setting
for the full closed encoder
correctly.
The connector CN2 is disconnected. Connect it correctly.
MR-J2S-CLP01 unit failure Change the unit.
The internal setting switch (SW1) for
MR-J2S -CLP01 unit is not closed.
Set correctly.
AL70 Full closed
encoder
communication
error 1
Error occurred in
communication between the
full closed encoder and servo
amplifier.
Full closed encoder cable failure Correct or change the
cable.
MR-J2S-CLP01 unit failure Change the unit.
Full closed encoder cable failure Correct or change the
cable.
AL71 Full closed
encoder
communication
error 2
Error occurred in
communication between the
full closed encoder and servo
amplifier.
Full closed encoder cable wiring
mistake (All of the A-, B- and Z-
phase signal and power supply wires
are not yet connected. Especially
note that the wiring of the MR-J2S-
CLP01 unit Z-phase cannot be
omitted.)
Reexamine the wiring.
The startup timing of 5V power
supply for the MR-J2S-CLP01 unit is
slow.
Speed up the startup
timing of 5V power supply
for the MR-J2S-CLP01
unit.
Note: The above alarms are cleared by powering off the servo amplifier. They are not cleared by performing an alarm reset.
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