11 Inspection, Maintenance, and Troubleshooting
11.2.3 Troubleshooting of the Servo Drive Alarms
11-20
A.510:
Overspeed
(The servomotor speed
exceeds the maximum.)
The order of phases U, V, and W
in the servomotor wiring is incor-
rect.
Check the servomotor wiring.
Confirm that the servomotor is cor-
rectly wired.
A reference value exceeding the
overspeed detection level was
input.
Check the input value.
Reduce the reference value or adjust
the gain.
The motor speed exceeded the
maximum.
Check the servomotor speed wave-
form.
Adjust the servo gain, or reconsider
the operation conditions.
SERVOPACK failure
−
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.521:
Autotuning Alarm
(Vibration was detected
during one-parameter
tuning or Easy-FFT.)
Excessive vibration was detected
in the motor during one-parame-
ter tuning.
Check the speed waveform of the
motor.
Perform the corrective action for the
operating procedure for the func-
tion.
A.531:
Excessive Speed
Deviation
(The deviation between
the speed reference and
actual motor speed is
abnormal.)
The motor main circuit cable is
either incorrectly wired or has a
contact fault.
Make sure the wiring is correct.
Correct the wiring.
A short-circuit or ground fault
occurred in the motor main cir-
cuit cable.
Check for short-circuits across
phase U, V, and W of the cable, or
between the ground and phase U, V,
or W.
The cable may have short-cir-
cuited. Replace the cable.
The load is heavy (for example,
the cutting resistance may be
high).
Check to see if the load friction is
high and the moment of inertia of
the load is too high.
Remove the load.
A.540:
Overspeed (During
Low-speed Winding)
(The low-speed winding
maximum speed was
exceeded during low-
speed winding.)
The sequence of phase U, V, and
W motor lines is incorrect.
Check the wiring of the motor and
of the electromagnetic contactor for
winding selection.
Correct the motor wiring.
The reference input value
exceeds the maximum speed of
the low-speed winding.
Check the input reference.
Reduce the reference value, or
adjust the gain.
The low-speed winding maxi-
mum rotation speed was
exceeded during low-speed wind-
ing.
Check the motor speed from the
motor speed monitor in SigmaWin
for the
Σ
-V-SD (MT).
Adjust the gain, or revise the oper-
ating conditions.
SERVOPACK failure
−
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.690:
Winding Selection
Operation Fault
During the winding selection
check that is performed when the
power is turned ON, the electro-
magnetic contactor for winding
selection did not change accord-
ing to the internal command.
Check the wiring of the SERVO-
PACK and of the electromagnetic
contactor for winding selection.
Correct the wiring of the winding
selection signal.
Winding selection was not com-
pleted within two seconds of
receiving the winding selection
command.
Check the wiring of the electromag-
netic contactor for winding selec-
tion.
Correct the wiring of the electro-
magnetic contactor for winding
selection.
Chattering occurred in the elec-
tromagnetic contactor for wind-
ing selection when the winding
selection command was not
received.
Check the wiring of the electromag-
netic contactor for winding selec-
tion.
Correct the wiring of the electro-
magnetic contactor for winding
selection, or replace the electromag-
netic contactor for winding selec-
tion.
A.6B0:
Emergency Stop
Failure
(The motor did not stop
within 10 s after the
emergency stop signal
input.)
The set value of the emergency
stop torque in Pn406 is too small.
−
Correct the emergency stop torque
setting in Pn406.
(cont’d)
Alarm:
Alarm Name
Cause
Investigative Actions
Corrective Actions
