YASKAWA SGD7S-****20A Series Product Manual page 435

12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.101:
Motor Overcur-
rent Detected
(The current to
the motor
exceeded the
allowable cur-
rent.)
12-16
Possible Cause
The Main Circuit
Cable is not wired
Check the wiring.
correctly or there is
faulty contact.
Check for short-circuits
There is a short-circuit across cable phases U,
or ground fault in a V, and W, or between
Main Circuit Cable. the ground and cable
phases U, V, and W.
Check for short-circuits
across Servomotor
There is a short-circuit
phases U, V, and W, or
or ground fault inside
between the ground
the Servomotor.
and Servomotor phases
U, V, or W.
Check for short-circuits
across the Servomotor
connection terminals U,
There is a short-circuit
V, and W on the
or ground fault inside
SERVOPACK, or
the SERVOPACK.
between the ground
and terminals U, V, or
W.
A heavy load was
Check to see if the
applied while the Ser-
operating conditions
vomotor was stopped
exceed Servo Drive
or running at a low
specifications.
speed.
Improve the noise envi-
ronment, e.g. by
A malfunction was improving the wiring or
caused by noise. installation conditions,
and check to see if the
alarm still occurs.
A failure occurred in
–
the SERVOPACK.
Confirmation
Correct the wiring.
The cable may be short-
circuited. Replace the
cable.
The Servomotor may be
faulty. Replace the Servo-
motor.
The SERVOPACK may be
faulty. Replace the
SERVOPACK.
Reduce the load applied
to the Servomotor. Or,
increase the operating
speed.
Implement countermea-
sures against noise, such
as correct wiring of the
FG. Use an FG wire size
equivalent to the SERVO-
PACK's main circuit wire
size.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Continued from previous page.
Correction Reference
page 4-26
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Continued on next page.