Mitsubishi Electric MELSERVO-J2M series, Instruction Manual

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9. TROUBLESHOOTING
9.3 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 (A.E0)
Overload warning 1 (A.E1)
If A.E6, A.E7 or A.E9 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. Eliminate the
cause of the warning according to this section. Use the optional MR Configurator (servo configuration
software) to refer to the cause of warning.
@ in the Indication field denotes the slot number of the base unit and # the axis number of the drive unit.
Display
IFU DRU
Name Definition Cause Action
1. Battery cable is open. Repair cable or changed.
2. Battery voltage supplied from the
battery unit to the encoder fell to
about 3.2V or less.
(Detected with the encoder)
Change battery.
@A.92# Open battery
cable warning
Absolute position
detection system
battery voltage is low.
3. Encoder cable is open. Change the encoder cable.
1. Droop pulses remaining are greater
than the in-position range setting.
Remove the cause of droop pulse
occurrence.
2. Home position return was executed
during operation command.
@A.96# Home position
setting warning
Home position return
could not be made in
the precise position.
3. Creep speed high.
Reduce creep speed.
FA.9F Battery
warning Voltage of battery for
absolute position
detection system
reduced. Battery voltage fell to 3.2V or less.
(Detected with the servo amplifier) Change the battery.
FA.E0 Excessive
regenerative
warning There is a possibility
that regenerative
power may exceed
permissible
regenerative power of
regenerative brake
option. Regenerative power increased to 85%
or more of permissible regenerative
power of regenerative brake option.
Checking method
Call the status display and check
regenerative load ratio.
1. Reduce frequency of
positioning.
2. Change regenerative brake
option for the one with larger
capacity.
3. Reduce load.
@A.E1# Overload
warning
There is a possibility
that overload alarm 1
or 2 may occur. Load increased to 85% or more of
overload alarm 1 or 2 occurrence level.
Cause, checking method
Refer to A.50, A.51.
Refer to A.50, A.51.
1. Noise entered the encoder. Take noise suppression
measures. @A.E3# Absolute
position counter
warning
Absolute position
encoder pulses faulty.
2. Encoder faulty. Change servo motor.
@A.E4# Parameter
warning
Parameter outside
setting range. Parameter value set from servo system
controller is outside setting range. Set it correctly.
FA.E6 Servo forced
stop warning EM1-SG are open. External forced stop was made valid.
(EM1-SG opened.) Ensure safety and deactivate
forced stop.
FA.E7 Controller
forced stop
warning Forced stop signal was entered into the
servo system controller. Ensure safety and deactivate
forced stop.
FA.E9 Main circuit off
warning Servo-on command
was issued with main
circuit power off. Switch on main circuit power.