Mitsubishi Electric Melservo MR-J3-A Instruction Manual page 250

9. TROUBLESHOOTING
Display Name
AL.E3 Absolute position
counter warning
AL.E5 ABS time-out
warning
AL.E6 Servo emergency
stop warning
AL.E8 Cooling fan
speed reduction
warning
AL.E9 Main circuit off
warning
AL.EA ABS
servo-on warning
AL.EC Overload
warning 2
AL.ED Output watt
excess warning
Definition
Absolute position encoder
pulses faulty.
The multi-revolution
counter value of the
absolute position encoder
exceeded the maximum
revolution range.
EMG is off.
The speed of the servo
amplifier decreased to or
below the warning level.
This warning is not
displayed with MR-J3-
70A/100A among servo
amplifiers equipped with a
cooling fan.
Servo-on (SON) was
switched on with main
circuit power off.
Servo-on (SON) turned
on more than 1s after
servo amplifier had
entered absolute position
data transfer mode.
Operation, in which a
current exceeding the
rating flew intensively in
any of the U, V and W
phases of the servo
motor, was repeated.
The status, in which the
output wattage (speed
torque) of the servo motor
exceeded the rated
output, continued
steadily.
Cause
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.
1. PC ladder program wrong.
2. Reverse rotation start (ST2) Limiting
torque (TLC) improper wiring
External emergency stop was made valid.
(EMG was turned off.)
Cooling fan life expiration (Refer to section
2.5.)
The power supply of the cooling fan is
broken.
1. PC ladder program wrong.
2. Servo-on (SON) improper wiring.
During a stop, the status in which a current
flew intensively in any of the U, V and W
phases of the servo motor occurred
repeatedly, exceeding the warning level.
Continuous operation was performed with
the output wattage (speed
servo motor exceeding 150% of the rated
output.
9 - 9
Take noise suppression
measures.
Change servo motor.
Make home position setting
again.
Contact the program.
Connect properly.
Ensure safety and deactivate
emergency stop.
Change the cooling fan of the
servo amplifier.
Change servo amplifier.
Switch on main circuit power.
1. Correct the program.
2. Connect properly.
1. Reduce the positioning
frequency at the specific
positioning address.
2. Reduce the load.
3. Replace the servo amplifier/
servo motor with the one of
larger capacity.
1. Reduce the servo motor
torque) of the speed.
2. Reduce the load.
Action