Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 37)

PC NC Maintenance Manual Chapter 4: Troubleshooting
4-16
(18) Alarm Numbers 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 a Yaskawa customer service representative.
(19) Alarm Numbers 3411 to 3415 (Servo Unit Alarm)
This alarm occurs due to the following: destroyed parameter set-
ting, faulty current detector, encoder battery alarm, memory error
or sensor error.
The servo unit detects the alarm.
The servo unit or the motor is faulty.
Contact a Yaskawa customer service representative.
(20) Alarm Number 3421 (Inverter Unit Alarm)
This alarm occurs when the inverter detects an alarm other than
the converter alarm, broken PG cable, excessive follow-up error
and communication error.
Contact a Yaskawa customer service representative.
(21) Alarm Numbers 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 a Yaskawa customer service representative.
(22) Alarm Numbers 3441 to 3445 (Ground Fault)
This alarm occurs when the servo unit detects the alarm when the
power is turned ON.
The motor insulation is faulty.