Yaskawa PC NC - Manual (Page 177)

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YASNAC PCNC Operating Manual Chapter 4: Maintenance
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 your Yaskawa representative.
(17)Alarm Nos.: 3381 to 3385, 3391 (YENET1200 Communication 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
command output by the NC unit.
The servo unit or the inverter unit will be faulty, or the cable will not be connected securely.
Contact your Yaskawa representative.
(18)Alarm Nos.: 3401 to 3405 (Converter Alarm)
This alarm occurs due to the following reasons: blown fuse, regeneration alarm, open phase,
or faulty board.
The servo unit detects the alarm.
Contact your Yaskawa representative.
(19)Alarm Nos.: 3411 to 3415 (Servo Unit Alarm)
This alarm occurs due to the following reasons: destroyed parameter setting, faulty current
detector, encoder’s battery alarm, memory error or sensor error.
The servo unit detects the alarm.
The servo unit or the motor is faulty.
Contact your Yaskawa representative.
(20)Alarm No.: 3421 (Inverter Unit Alarm)
This alarm occurs when the inverter detects an alarm other than converter alarm, broken PG
cable, excessive follow-up error and communication error.
Contact your Yaskawa representative.
(21)Alarm Nos.: 3425, 3431 to 3435 (YENET1 200 Watchdog Error)
This alarm occurs when the NC unit detects the watchdog error with the inverter unit or the
servo unit.
The inverter unit or the servo unit will be faulty.
Contact your Yaskawa representative.
(22)Alarm Nos.: 3441 to 3445 (Ground Fault)