Remedies For Warnings - Mitsubishi Electric MELSERVO-J2-Super Series Instruction Manual

12. TROUBLESHOOTING
Display Name
AL.8E Serial
communication
error
88888 Watchdog

12.4.3 Remedies for warnings

The servo off status is established if a servo forced stop warning (AL.E6) or software limit warning
(AL.98) occurs. 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 the warning according to this section. Use
the optional servo configuration software to refer to the cause of warning.
Display Name
AL.90 Home position
return incomplete
AL.92 Open battery
cable warning
AL.96 Home position
setting warning
AL.98 Software limit
warning
AL.9D CC-Link warning
1
Definition
Serial 1. Communication cable fault
communication error (Open cable or short circuit)
occurred between
2. Communication device (e.g.
servo amplifier and
personal computer) faulty
communication
device (e.g. personal
computer).
CPU, parts faulty Fault of parts in servo amplifier
Alarm (88888) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
Definition
In incremental system:
1. Positioning operation
was performed without
home position return.
2. Home position return
ended abnormally.
In absolute position
detection system:
1. Positioning operation
was performed without
home position setting.
2. Home position setting
ended abnormally.
Absolute position
detection system battery
voltage is low.
Home position setting
could not be made.
Software limit set in
parameter is reached.
The station number
switch or baudrate switch
position was changed
from the setting at
power-on.
Cause
Checking method
Cause
1. Positioning operation was performed
without home position return.
2. Home position return speed could not be
decreased to creep speed.
3. Limit switch was actuated during home
position return starting at other than
position beyond dog.
1. Positioning operation was performed
without home position setting.
2. Home position setting speed could not be
decreased to creep speed.
3. Limit switch was actuated during home
position setting starting at other than
position beyond dog.
1. Battery cable is open.
2. Battery voltage dropped to 2.8V or less. Change battery.
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.
1. Software limit was set within actual
operation range.
2. Point table of position data in excess of
software limit was executed.
3. Software limit was reached during JOG
operation or manual pulse generator
operation.
1. The station number switch position was
changed from the setting at power-on.
2. The baudrate switch position was
changed from the setting at power-on.
3. The occupied station count switch
position was changed from the setting
at power-on.
12 - 11
Action
Repair or change the cable.
Change the communication device (e.g.
personal computer).
Change servo amplifier.
Action
1. Perform home position return.
2. Review home position return
speed/creep speed/moving
distance after proximity dog.
1. Perform home position setting.
2. Review home position setting
speed/creep speed/moving
distance after proximity dog.
Repair cable or changed.
Remove the cause of droop pulse
occurrence
Do not enter command pulse
after clearing of droop pulses.
Reduce creep speed.
Set parameter No. 48 to 51
correctly.
Set point table correctly.
Perform operation within
software limit range.
Return to the setting at power-
on.