YASKAWA Sigma-7 Series Product Manual page 100

6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.101:
Motor Overcur-
rent Detected
(The current to
the motor
exceeded the
allowable cur-
rent.)
A.300:
Regeneration
Error
6-12
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.
When using the built-
in regenerative resis-
Check to see if the
tor, the jumper
jumper is connected
between the regener-
between power supply
ative resistor terminals
terminals B2 and B3.
(B2 and B3) was
removed.
The External Regener-
Check the wiring of the
ative Resistor is not
External Regenerative
wired correctly, or was
removed or discon-
Resistor.
nected.
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 the alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Correctly connect a
jumper.
*4
Correct the wiring of the
External Regenerative
*4
Resistor.
While the main circuit
power supply is OFF, turn
the control power supply
to the SERVOPACK OFF
and ON again. If the alarm
still occurs, the SERVO-
PACK may be faulty.
Replace the SERVO-
PACK.
Continued from previous page.
Correction Reference
*1
–
–
–
*1
–
Continued on next page.