Mitsubishi Electric MELSERVO-JN Series - 8.3 Remedies for warnings

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8. TROUBLESHOOTING
8.3 Remedies for warnings
POINT
When any of the following alarms has occurred, do not resume operation by
switching power of the servo amplifier OFF/ON repeatedly. The servo amplifier
and servo motor may become faulty. If the power of the servo amplifier is
switched OFF/ON during the alarms, allow more than 30 minutes for cooling
before resuming operation.
Excessive regenerative warning (E0.1)
Servo amplifier overheat warning (91.1)
Overload warning 1 (E1. )
Parameter error (37. ) alarm and warnings are not recorded in the alarm history.
When the warning "The servo motor stops." described in the following table occurs, the servo-off occurs and
the servo motor stops. 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 Configurator to refer to a factor of warning
occurrence.
Alarm No.: A.90 Name: Home positioning incomplete warning The servo motor stops.
Warning contents
Home position return is not performed correctly.
Detailed
display
Detailed
Name
Cause Checking method Result Action
90.1 Home
position
return
incompletion
1) Positioning operation was
performed without home
position return.
Check if home position
return was performed.
Home position
return was not
performed.
Perform home position
return.
90.2 Home
position
return
abnormal
completion
1) Home position return
speed could not be
decreased to the creep
speed.
Check the home
position return speed,
the creep speed and
the travel distance after
proximity dog.
The set value is
incorrect.
Set correctly and perform
home position return.
Alarm No.: A.91 Name: Servo amplifier overheat error The servo motor does not stop.
Warning contents
The temperature inside of the servo amplifier exceeds the warning level.
Detailed
display
Detailed
Name
Cause Checking method Result Action
91.1 Servo
amplifier
inside
overheat
warning
1) The temperature in the
servo amplifier is high.
Check the ambient
temperature of the
servo amplifier.
Ambient
temperature is high.
(over 55
)
Lower the ambient
temperature.
Ambient
temperature is low.
Check 2).
2) Used beyond the
specifications of close
mounting.
Check the
specifications of close
mounting.
Used beyond the
specifications.
Use within the range of
specification.
Alarm No.: A.96 Name: Home position setting error The servo motor stops.
Warning contents
Incorrectly finished after home position return operation.
Detailed
display
Detailed
Name
Cause Checking method Result Action
96.1 In-position
not reached
1) Droop pulses remaining
are greater than the in-
position range setting.
Check the number of
droop pulses after
home position return.
In-position range or
more
Remove the cause of
droop pulse occurrence.