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8. TROUBLESHOOTING
Display Name Definition
Cause
Action
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 50,51.
Refer to 50, 51.
E3 Absolute position
counter warning
Absolute position encoder
pulses faulty.
1. Noise entered the encoder. Take noise suppression
measures.
2. Encoder faulty. Change the servo motor.
The multi-revolution
counter value of the
absolute position encoder
exceeded the maximum
revolution range.
3. The movement amount from the home
position exceeded a 32767 rotation or
37268 rotation in succession.
Make home position setting
again.
E4 Parameter
warning
Parameter outside setting
range
Parameter value set from servo system
controller is outside setting range
Set it correctly.
E6 Servo forced stop
warning
EM1 is off. External forced stop was made valid. (EM1
was turned off.)
Ensure safety and deactivate
forced stop.
E7 Controller forced
stop warning
Forced stop signal was entered into the
servo system controller.
Ensure safety and deactivate
forced stop.
Cooling fan life expiration (Refer to section
2.5.)
Change the cooling fan of the
servo amplifier.
E8 Cooling fan speed
reduction warning
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.
The power supply of the cooling fan is
broken.
Change the servo amplifier.
E9 Main circuit off
warning
Servo-on command was
issued with main circuit
power off.
Switch on main circuit power.
EC Overload warning
2
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.
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.
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.
ED Output watt
excess warning
The status, in which the
output wattage (speed
torque) of the servo motor
exceeded the rated output,
continued steadily.
Continuous operation was performed with
the output wattage (speed
torque) of the
servo motor exceeding 150% of the rated
output.
1. Reduce the servo motor
speed.
2. Reduce the load.