YASKAWA SGM-A3 - Page 406

INSPECTION, MAINTENANCE, AND TROUBLESHOOTING
6.2.1 Troubleshooting Problems with Alarm Display cont.
394
Cause Remedy
A Wiring grounded between Servopack and
servomotor.
Check and correct wiring.
B Servopack ambient temperature exceeds
55°C
Bring Servopack ambient temperature to
55°C
Note Alarm cannot be reset while power
transistor module temperature ex-
ceeds 90°C.
C Servomotor U, V, or W phase grounded. Replace servomotor.
D
• Circuit board (1PWB) defective
• Power transistor defective
Replace Servopack.
E Current feedback circuit, power transistor,
DB relay, or circuit board defective.
Replace Servopack.
D Display and Outputs
Digital Operator
Di l
d
Alarm Output
g
p
Display and
Alarm
Name
Alarm Code Output
Alarm Output
Al
arm
N
ame
ALO1 ALO2 ALO3
p
A.20
Fuse blown
OFF ON OFF OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
Status When Alarm Occurred
A
At control power ON
At main circuit power ON
B, C
Cause Remedy
A Circuit board (1PWB) defective Replace Servopack.
B Fuse is blown. Replace Servopack.
C Main circuit diode module defective Replace Servopack.
D Display and Outputs
Digital Operator
Di l
d
Alarm Output
g
p
Display and
Alarm
Name
Alarm Code Output
Alarm Output
Al
arm
N
ame
ALO1 ALO2 ALO3
p
A.31
Position error
pulse overflow
(position control
only)
ON ON OFF OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
6