Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 36)

Chapter 4: Troubleshooting PC NC Maintenance Manual
4-15
Contact a Yaskawa customer service representative.
(15) Alarm Numbers 3331 to 3335 (Over Voltage)
The servo unit detects the alarm.
If the alarm occurs when the power is turned ON to the spindle,
the input voltage may be too high.
If the alarm occurs during motor operation, the operation condi-
tions (i.e., lower motor speed) must be reviewed.
If the alarm occurs when the servo control power is turned ON,
the servo unit will be faulty.
Contact a Yaskawa customer service representative.
(16) Alarm Numbers 3351 to 3355 (Heat Sink Overheat)
This alarm occurs when the heat sink temperature is abnormally
high.
The servo unit detects the alarm.
If this alarm occurs, turn OFF the power and allow the heat sink
to cool. After that, turn the power ON again.
If the alarm occurs immediately after turning the power ON, the
servo unit is faulty.
Contact a Yaskawa customer service representative.
(17) Alarm Numbers 3381 to 3385, 3391 (YENET1200 Communica-
tion Error)
This is an communication error between the NC unit and the
servo unit or between the NC unit and the inverter unit; the NC
unit detects the alarm when no answer is returned for the com-
mand output by the NC unit.
The servo unit or the inverter unit may be faulty, or the cable may
not be connected securely.
Contact a Yaskawa customer service representative.