Remedies For Warnings - Mitsubishi Electric MELSERVO MR-J2S- A Instruction Manual

10. TROUBLESHOOTING

10.2.3 Remedies for warnings

CAUTION
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
AL.92 Open battery
cable warning
AL.96 Home position
setting warning
AL.9F Battery warning Voltage of battery for
AL.E0 Excessive
regenerative
warning
AL.E1 Overload
warning
AL.E3 Absolute position
counter warning
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)
Definition
Absolute position
detection system battery
voltage is low.
Home position setting
could not be made.
absolute position
detection system reduced.
There is a possibility that
regenerative power may
exceed permissible
regenerative power of
built-in regenerative
brake resistor or
regenerative brake
option.
There is a possibility that
overload alarm 1 or 2
may occur.
Absolute position encoder
pulses faulty.
The multi-revolution
counter value of the
absolute position encoder
exceeded the maximum
revolution range.
Cause
1. Battery cable is open.
2. Battery voltage supplied from the servo
amplifier to the encoder fell to about 3.2V
or less. (Detected with the encoder)
1. Droop pulses remaining are greater
than the in-position range setting.
2. Command pulse entered after clearing
of droop pulses.
3. Creep speed high.
Battery voltage fell to 3.2V or less.
(Detected with the servo amplifier)
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.
Load increased to 85% or more of overload
alarm 1 or 2 occurrence level.
Cause, checking method
Refer to AL.50,51.
1. Noise entered the encoder.
2. Encoder faulty.
3. The movement amount from the home
position exceeded a 32767 rotation or -
37268 rotation in succession.
10 - 13
Action
Repair cable or changed.
Change battery.
Remove the cause of droop pulse
occurrence
Do not enter command pulse
after clearing of droop pulses.
Reduce creep speed.
Change the battery.
1. Reduce frequency of
positioning.
2. Change regenerative brake
option for the one with larger
capacity.
3. Reduce load.
Refer to AL.50, AL.51.
Take noise suppression
measures.
Change servo motor.
Make home position setting
again.