Troubleshooting; What To Do When An Alarm Occurs - Mitsubishi Electric MELSERVO-J2S Series Manual

Section ６

Troubleshooting

６.１ What to Do When an Alarm Occurs
CAUTION
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
AL.16.1 Encoder initial
communication
data error 1
AL.20.1 Encoder
communication
incoming data error 1
AL.1A.1 Motor combination
error
* For the troubleshooting at the time of startup, see section 4.3.
●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.46 servomotor overheat
・AL.51 overload 2
Error
An error has occurred in
communications between
the encoder and the servo
amplifier.
An error has occurred in
communications between
the encoder and the servo
amplifier.
The combination of the
servo amplifier and the
servomotor is incorrect.
・AL.45 main circuit element overheat
・AL.50 overload 1
Cause
1. The encoder connector (CN2) on the
servo amplifier side is disconnected.
2. The encoder conversion cable on
Renewal Kit side and the currently
used cable are disconnected.
3. The encoder conversion cable on
Renewal Kit side and the currently
used cable are incorrectly connected.
4. The selection of the type of the encoder
cable (2-wire type/4-wire type) is
incorrect in the parameter setting.
5. The selection of the serial encoder is
incorrect in the parameter setting.
6. Defective encoder cable (broken or
short-circuited)
7. Defective encoder
1. The encoder connector (CN2) is
disconnected.
2. The connectors of the encoder
conversion cable on Renewal Kit side
and the currently used encoder cable
are disconnected.
3. Defective encoder cable (broken or
short-circuited)
4. Defective encoder
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).
６-４
6 － 1
Countermeasures
Make a correct connection.
Make a correct connection.
Make a correct connection.
Make correct settings of parameters PC22
(type A) and PC04 (type B).
Make correct settings of parameters PC22
(type A) and PC04 (type B).
Repair or replace the encoder cable.
Replace the servomotor.
Make a correct connection.
Make a correct connection.
Repair or replace the cable.
Replace the servomotor.
Combine the components correctly.