YASKAWA UAK series User Manual page 274

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