Mitsubishi Electric MR-J2S CP-S084 Series, Manual

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Section ６ Troubleshooting
６.１ What to Do When an Alarm Occurs
CAUTION
●If an alarm occurs, remove the cause, secure the safety, and cancel the alarm. After that, you can restart
operation. Otherwise, an injury may be caused.
●If "AL.25 Absolute position lost" occurs, make sure to reset the home position. Otherwise, an
unexpected operation may be caused.
●If an alarm occurs, turn off servo-on (SON) immediately to cut off power.
POINT
●If an alarm occurs, do not cancel the alarm only to resume operation. Do not repeat just canceling an
alarm and resuming operation. Doing so may damage the servo amplifier and the servomotor. After
removing the cause of an alarm, wait for about 30 minutes or longer to cool down the system. After that,
you can resume operation.
・AL.30 regeneration error ・AL.45 main circuit element overheat
・AL.46 servomotor overheat ・AL.50 overload 1
・AL.51 overload 2
The next page lists the alarms that may occur when the MR-J2S series is replaced by the MR-J4 series. If
an alarm or warning occurs, follow the instructions in this section to remove the cause. For any other alarms
and warnings listed in the table below, see the MELSERVO-J4 Servo amplifier INSTRUCTION MANUAL TROUBLE
SHOOTING issued by Mitsubishi Electric Corporation.
Indication Title Error Cause Countermeasures
1. The encoder connector (CN2) on the
servo amplifier side is disconnected.
Make a correct connection.
2. The encoder conversion cable on
Renewal Kit side and the currently
used cable are disconnected.
Make a correct connection.
3. The encoder conversion cable on
Renewal Kit side and the currently
used cable are incorrectly connected.
Make a correct connection.
4. The selection of the type of the encoder
cable (2-wire type/4-wire type) is
incorrect in the parameter setting.
Make correct settings of parameters PC22
(type A) and PC04 (type B).
5. The selection of the serial encoder is
incorrect in the parameter setting.
Make correct settings of parameters PC22
(type A) and PC04 (type B).
6. Defective encoder cable (broken or
short-circuited)
Repair or replace the encoder cable.
AL.16.1 Encoder initial
communication
data error 1 An error has occurred in
communications between
the encoder and the servo
amplifier.
7. Defective encoder Replace the servomotor.
1. The encoder connector (CN2) is
disconnected.
Make a correct connection.
2. The connectors of the encoder
conversion cable on Renewal Kit side
and the currently used encoder cable
are disconnected.
Make a correct connection.
3. Defective encoder cable (broken or
short-circuited)
Repair or replace the cable.
AL.20.1 Encoder
communication
incoming data error 1 An error has occurred in
communications between
the encoder and the servo
amplifier.
4. Defective encoder Replace the servomotor.
AL.1A.1 Motor combination
error The combination of the
servo amplifier and the
servomotor is incorrect. 1. The connection is made with an
incorrect combination of the servo
amplifier and the servomotor (at the time
of a secondary replacement or a
package replacement).
Combine the components correctly.
* For the troubleshooting at the time of startup, see section 4.3.
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