YASKAWA UAK series User Manual page 268

11 Inspection, Maintenance, and Troubleshooting
11.2.3 Troubleshooting of the Servo Drive Alarms
Alarm:
Alarm Name
A.05A:
Induction Motor
Combination Error
(The capacity of the
spindle motor is outside
of the range that can be
combined.)
A.05B:
Converter
Combination Error
(The converter and SER-
VOPACK are not com-
bined correctly.)
A.0B0:
Cancelled Servo ON
Command Alarm
A.100:
Overcurrent
(An overcurrent flowed
through the IGBT or
heat sink of SERVO-
PACK overheated.)
11-14
Cause
The SERVOPACK capacity and
spindle motor capacity are not
compatible.
A converter that does not support
an emergency stop was used with
Pn01B.0 set to 1.
After executing the utility func-
tion to turn ON the power to the
motor, the Servo ON command
was sent from the host controller.
Incorrect wiring or contact fault
of main circuit cable or motor
main circuit cable.
Short-circuit or ground fault of
main circuit cable or motor main
circuit cable.
Short-circuit or ground fault
inside the motor.
Short-circuit or ground fault
inside the SERVOPACK.
The dynamic brake (DB: Emer-
gency stop executed from the
SERVOPACK) was frequently
activated, or the DB overload
alarm occurred.
A heavy load was applied while
the motor was stopped or running
at a low-speed.
Malfunction caused by noise
interference.
SERVOPACK failure
Investigative Actions
Check the combination of the SER-
VOPACK capacity and servomotor
capacity.
−
−
Check the wiring.
Check for short-circuits across the
cable phase-U, -V, and -W, or
between the grounding and terminal
U, V, or W.
Check for short-circuits across the
motor terminal phase-U, -V, and -
W, or between the grounding and
motor terminal U, V, or W.
Check for short-circuits across the
servomotor connection terminals U,
V, and W on the SERVOPACK, or
between the grounding and terminal
U, V, or W.
Check the resistor power consump-
tion monitor in SigmaWin for the Σ-
V-SD (MT) to see how many times
the DB has been used. Or, check the
alarm history to see if the DB over-
load alarm A.730 or A.731 was
reported.
Check to see if the operating condi-
tions are outside servo drive specifi-
cations.
Improve the wiring or installation
environment, such as by reducing
noise, and check to see if the alarm
recurs.
−
(cont'd)
Corrective Actions
Align the SERVOPACK capacity
and spindle motor capacity.
Replace the converter.
Turn the SERVOPACK power sup-
ply OFF and then ON again.
Correct the wiring.
Some cables may be damaged.
Replace damaged cables.
The motor may be faulty. Replace
the motor.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Change the SERVOPACK model,
operation conditions, or the mecha-
nism so that the DB does not need
to be used so frequently.
Reduce the load applied to the
motor or increase the operation
speed.
Take countermeasures for noise,
such as correct wiring of the FG.
Use an FG wire size equivalent to
the SERVOPACK main circuit wire
size.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.