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8. TROUBLESHOOTING
Alarm No.: A.E9
Name: Main circuit off warning
The operation does not stop.
Warning contents
Servo-on (SON) was switched on when the main circuit power is off.
The bus voltage decreased while the servo motor speed operates at 50r/min or slower.
Detailed
display
Detailed
Name
Cause
Checking method
Result
Action
E9.3
Main circuit
power supply
failure
1) When the set value of
parameter No. PC29
(function selection C-5) is
" 1 ", the main circuit
power supply turned OFF
while the servo motor
operates at 50r/min or
slower.
Check if the main
circuit power supply is
input.
Not input.
Switch on the main circuit
power.
Input.
Check 2).
2) When the set value of
parameter No. PC29
(function selection C-5) is
" 1 ", the connector of
the main circuit power
supply came off when the
servo motor operates at
50r/min or slower.
Check the main circuit
power supply
connector.
The connector is
disconnected.
Connect properly.
No problem.
Check 3).
3) When the set value of
parameter No. PC29
(function selection C-5) is
" 1 ", the
instantaneous power
failure occurred while the
servo motor operates at
50r/min or slower.
Check the main circuit power.
Alarm No.: A.EC
Name: Overload warning 2
The operation does not stop.
Warning contents
Operation, in which a current exceeding the rating flowed intensively in any of the U, V and W phases of
the servo motor, was repeated.
Detailed
display
Detailed
Name
Cause
Checking method
Result
Action
EC.1
Overload
warning 2
1) Current flowed intensively
in specific phases of the
servo motor during a stop.
Also, this situation was
continued.
Check if the alarm
occurs after changing
the stop position.
Alarm does not
occur.
Reduce the frequency of
positioning at the specific
position.
Alarm occurs.
Check 2).
2) The load is large, or the
capacity is insufficient.
Measure the effective
load ratio during a stop.
Effective load ratio
is too high.
Reduce the load.
Replace the driver and
servo motor with the ones
with larger capacity.
Alarm No.: A.ED
Name: Output watt excess warning
The operation does not stop.
Warning contents
The status, in which the output wattage (speed
torque) of the servo motor exceeded the rated output,
continued steadily.
Detailed
display
Detailed
Name
Cause
Checking method
Result
Action
ED.1
Output
wattage over
1) Output wattage of the
servo motor (speed
torque) exceeded 120% of
the rated output.
Call the status display
or software(MR
Configurator2
TM
) and
check the servo motor
speed and torque.
The output wattage
is 120% or more of
the rate.
Reduce the servo motor
speed.
Reduce the load.
