Yaskawa Yasnac PC NC - Manual (Page 169)

YASNAC PC NC Operating Manual Chapter 4: Maintenance
4 - 11
4.1.6 Troubleshooting (2)
For the system equipped with a drive unit compatible with YENET1 200, check is made by both
the drive unit itself and the PC NC unit. If a fault is detected, the drive unit notifies the PC NC
unit of the alarm information in both systems.
The drive unit first gives the PC NC unit the information on the occurrence of an alarm (alarm No.
3101 to No. 3105 and No. 3201) and then the content of the alarm. The NC unit displays alarm
No. 3100 when it receives the alarm information from drive units.
Therefore, three alarms usually occur if an error is detected with the drive unit. If a fuse blown
occurs with the X-axis servo unit, alarm No. 3100, No. 3101, and No. 3021 occur.
(1) Alarm Nos.: 3021 to 3025 (Fuse Blown)
The main circuit of the servo unit will be faulty.
The servo unit detects the error.
Contact your Yaskawa representative.
(2) Alarm Nos.: 3041 to 3045, 3051 (Excessive Follow-up Error)
This alarm occurs if the follow-up error exceeds 120% of the error in rapid traverse (100%)
operation.
The servo unit detects the alarm.
Improper gain adjustment is one of the reasons.
Contact your Yaskawa representative.
(3) Alarm Nos.: 3061 to 3065 (Overload)
This alarm occurs if the load exceeds the rated torque considerably.
The servo unit detects the error.
Review the cutting conditions. Contact your Yaskawa representative after checking whether
the alarm occurred simply after turning the control power ON.
(4) Alarm Nos.: 3081 to 3085 and 3091 (Broken PG Cable)
The encoder signal cable or the encoder itself will be faulty.
The servo unit or the inverter detects the error.
Contact your Yaskawa representative.
(5) Alarm Nos.: 3101 to 31051 (Servo Alarm)
This alarm occurs when the NC unit detects the alarm signal output from the servo unit.
Check the contents of the alarm by displaying the servo alarm display screen (press [F2]
of the alarm job in the common process.).