Remedies For Warnings - Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting

1. TROUBLESHOOTING

1.3 Remedies for warnings

CAUTION
If [AL. E6], [AL. E7], [AL. E9], [AL. EA], or [AL. EB] occurs, the servo-off status is established. If any other
warning occurs, operation can be continued but an alarm may take place or proper operation may not be
performed.
Remove the cause of warning according to this section. Use MR Configurator2 to refer to a factor of warning
occurrence.
Alarm No.: 91 Name: Servo amplifier overheat warning
Alarm content
Detail
Detail name
No.
91.1 Main circuit (1)
device
overheat
warning
(2) The close mounting is
Alarm No.: 92 Name: Battery cable disconnection warning
Alarm content
Detail
Detail name
No.
92.1 Encoder (1) Battery cable is
battery cable
disconnection
warning
(2)
(3) An encoder cable was
92.3 Battery (1)
degradation
(2) The battery has
If [AL. E3 Absolute position counter warning] occurs, always make home position
setting again. Otherwise, it may cause an unexpected operation.
POINT
When any of the following alarms has occurred, do not cycle the power of the
servo amplifier repeatedly to restart. Doing so will cause a malfunction of the
servo amplifier and the servo motor. If the power of the servo amplifier is
switched off/on during the alarms, allow more than 30 minutes for cooling before
resuming operation.
[AL. 91 Servo amplifier overheat warning]
[AL. E0 Excessive regeneration warning]
[AL. E1 Overload warning 1]
[AL. E2 Servo motor overheat warning]
[AL. EC Overload warning 2]
The temperature inside of the servo amplifier reached a warning level.
Cause
Ambient temperature of Check the ambient
the servo amplifier has temperature.
exceeded 55 °C.
Check the
out of specifications. specifications of close
mounting.
Absolute position detection system battery voltage is low.
Cause
Check if the battery
disconnected. cable is
malfunctioning.
The battery voltage is Check the battery
low. The battery is voltage with a tester.
consumed.
Check if the encoder
disconnected. cable is disconnected.
The battery voltage is Check the battery
low. The battery is voltage with a tester.
consumed.
Replace the battery,
deteriorated. and then check the
repeatability.
Check method Check result
It is over 55 °C.
It is less than 55 °C.
It is out of
specifications.
Check method Check result
It has a failure.
It has no failure.
It is less than 3.1 V
DC.
It is 3.1 V DC or
more.
It is disconnected.
It is less than 3.0 V
DC.
It is 3.0 V DC or
more.
It is not repeatable.
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Action Target
Lower the ambient [A]
temperature. [B]
[WB]
Check (2).
[RJ010]
Use within the range
of specifications.
Action Target
Replace or repair the [A]
cable. [B]
[WB]
Check (2).
[RJ010]
Replace the battery.
Check (3).
Replace or repair the
cable.
Replace the battery.
Check (2).
Replace the battery.