Mitsubishi Electric MELSERVO MR-J3 A Series, Instruction Manual

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9. TROUBLESHOOTING
Display Name Definition Cause Action
(Note)
88888 Watchdog CPU, parts faulty Fault of parts in servo amplifier
Checking method
Alarm (88888) occurs if power is
switched on after disconnection of
all cables but the control circuit
power supply cable.
Change servo amplifier.
Note. At power-on, "88888" appears instantaneously, but it is not an error.
9.3 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 AL.E6 or 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 servo
configuration software to refer to the cause of warning.
Remove the cause of warning according to this section. Use the optional MR Configurator to refer to a factor
of warning occurrence.
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 3V
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.99 Stroke limit
warning
The stroke end (LSP or
LSN) of the direction
which gave instructions
was turned off. The limit switch became valid. Reexamine the operation
pattern to turn LSP/LSN ON.
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
resistor or regenerative
option. Regenerative power increased to 85% or
more of permissible regenerative power of
built-in regenerative resistor or
regenerative option.
Checking method
Call the status display and check
regenerative load ratio.
1. Reduce frequency of
positioning.
2. Change regenerative option
for the one with larger
capacity.
3. Reduce load.
AL.E1 Overload
warning 1
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.