Mitsubishi Electric MELSERVO-J2 Series Instruction Manual page 210

11. TROUBLESHOOTING
Display
A.92 Open battery
cable warning
A.96 Home position
setting warning
A.98 Software limit
warning
A.9F Battery warning
A.E0 Excessive
regenerative load
warning
A.E1 Overload warning There is a possibility that
A.E3 Absolute position
counter warning
A.E6 Servo emergency
stop
A.E9 Main circuit off
warning
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Name Definition
Absolute position
detection system battery
voltage is low.
1. In incremental system:
Home position return
could not be made.
2. In absolute position
detection system:
Home position setting
could not be made.
Command position
exceeded software limit.
Voltage of battery for
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.
overload alarm 1 or 2
may occur.
Absolute position encoder
pulses faulty.
EMG-SG are open.
Servo was switched on
with main circuit power
off.
search engine
Cause
1. Battery cable is open.
2. Battery voltage dropped to 2.8V or
less.
Droop pulses remaining are greater
than the in-position range setting.
Battery voltage fell to 3.2V or less.
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 A.50,51.
1. Noise entered the encoder.
2. Encoder faulty.
External emergency stop was made
valid. (EMG-SG opened.)
11 - 9
Action
Repair cable or change battery.
Change battery.
Remove the cause of droop pulse
occurrence.
1. Review the operation pattern.
2. Review the software limit
setting.
Change the battery.
1. Reduce frequency of
positioning.
2. Change regenerative brake
option for the one with larger
capacity
3. Reduce load.
Refer to A. 50, A. 51.
.
Take noise suppression
measures.
Change servo motor.
Ensure safety and deactivate
emergency stop.
Switch on main circuit power.