Mitsubishi Electric Melservo-J3 Series MR-J3-B Instruction Manual page 180

8. TROUBLESHOOTING
Display Name
E3 Absolute position
counter warning
E4 Parameter
warning
E6 Servo forced stop
warning
E7 Controller forced
stop warning
E8 Cooling fan speed
reduction warning
E9 Main circuit off
warning
EC Overload warning
2
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.
Parameter outside setting
range
EM1 is off.
The speed of the servo
amplifier decreased to or
below the warning level.
This warning is not
displayed with MR-J3-
70B/100B among servo
amplifiers equipped with a
cooling fan.
Servo-on command was
issued with main circuit
power off.
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.
Parameter value set from servo system
controller is outside setting range
External forced stop was made valid. (EM1
was turned off.)
Forced stop signal was entered into the
servo system controller.
Cooling fan life expiration (Refer to section
2.5.)
The power supply of the cooling fan is
broken.
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.
8 - 9
Take noise suppression
measures.
Change servo motor.
Make home position setting
again.
Set it correctly.
Ensure safety and deactivate
forced stop.
Ensure safety and deactivate
forced stop.
Change the cooling fan of the
servo amplifier.
Change servo amplifier.
Switch on main circuit power.
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