MITSUBISHI ELECTRIC MELSERVO MR-J2S- A - Manual (Page 206)

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10. TROUBLESHOOTING
10.2.3 Remedies for warnings
CAUTION
If an absolute position counter warning (AL.E3) occurred, always make home
position setting again. Otherwise, misoperation may occur.
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 (AL.E0)
Overload warning 1 (AL.E1)
If Servo emergency stop warning (AL.E6) or ABS servo-on warning (AL.EA) 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. Use the optional MR Configurator (servo configuration software)
to refer to the cause of warning.
Display Name Definition Cause Action
1. Battery cable is open. Repair cable or changed. AL.92 Open battery
cable warning
Absolute position
detection system battery
voltage is low.
2. Battery voltage supplied from the servo
amplifier to the encoder fell to about 3.2V
or less. (Detected with the encoder) Change battery.
1. Droop pulses remaining are greater
than the in-position range setting.
Remove the cause of droop pulse
occurrence
2. Command pulse entered after clearing
of droop pulses.
Do not enter command pulse
after clearing of droop pulses.
AL.96 Home position
setting warning
Home position setting
could not be made.
3. Creep speed high. Reduce creep speed.
AL.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.
AL.E0 Excessive
regenerative
warning
There is a possibility that
regenerative power may
exceed permissible
regenerative power of
built-in regenerative
brake resistor or
regenerative brake
option. Regenerative power increased to 85% or
more of permissible regenerative power of
built-in regenerative brake resistor or
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.
AL.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 AL.50,51.
Refer to AL.50, AL.51.
1. Noise entered the encoder. Take noise suppression
measures. Absolute position encoder
pulses faulty.
2. Encoder faulty. Change servo motor.
AL.E3 Absolute position
counter warning
The multi-revolution
counter value of the
absolute position encoder
exceeded the maximum
revolution range. 3. The movement amount from the home
position exceeded a 32767 rotation or -
37268 rotation in succession.
Make home position setting
again.