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8. TROUBLESHOOTING
Alarm No.: A.E6
Name: Servo forced stop warning
The operation stops.
Warning contents
The forced stop signal is turned OFF.
Detailed
display
Detailed
Name
Cause
Checking method
Result
Action
E6.1
Servo forced
stop warning
1) Forced stop (EM1) is
turned OFF.
Check the forced stop
(EM1).
OFF
Ensure safety and turn ON
the forced stop (EM1).
ON
Check 2).
2) The external 24VDC
power supply is not input.
Check if the external
24VDC power supply is
input.
Not input.
Input 24VDC.
Input.
Check 3).
3) Driver fault
Check if the alarm
occurs after replacing
the driver.
Alarm does not
occur.
Replace the driver.
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
E9.1
Servo-on
(SON) OFF
when the
main circuit
is OFF.
1) Main circuit power supply
is off.
Check if the main
circuit power supply is
input.
Not input.
Switch on the main circuit
power.
Input.
Check 2).
2) Main circuit power supply
connector is disconnected.
Check the main circuit
power supply
connector.
The connector is
disconnected.
Connect properly.
No problem.
Check 3).
3) Bus voltage dropped.
Check the value of
status display Pn (bus
voltage).
The value is "1"
(undervoltage) or
"2" (low voltage).
Revise the wiring.
Check the power supply
capacity.
E9.2
Bus voltage
drop at low-
speed
rotation
1) When the set value of
parameter No. PC29
(function selection C-5) is
" 1 ", the bus voltage
decreased while the servo
motor operates at 50r/min
or slower.
Check the value of
status display Pn (bus
voltage).
The value is "1"
(undervoltage).
Check the power supply
capacity.
Increase the acceleration
time constant.