Yaskawa Yasnac PC NC - Manual (Page 170)

YASNAC PC NC Operating Manual Chapter 4: Maintenance
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(6) Alarm Nos: 3111 to3115 (Servo Communication Alarm)
Probable causes of this alarm are a broken YENET1 200 communication cable, loose cable
connection and communication processing error.
The servo unit detects the alarm.
Contact your Yaskawa representative after making sure that the cable is securely connected.
(7) Alarm Nos.: 3121 to 3125 (Excessive Speed)
This alarm occurs if the motor speed exceeds 4950 r/rein or the value set for the parameter.
The servo unit detects the alarm.
It is necessary to check whether the connection to the encoder is correct.
Contact your Yaskawa representative.
(8) Alarm Nos.: 3141 to 3145 (Overrun, Run-away Prevention)
The encoder will be faulty.
The servo unit detects the alarm.
Contact your Yaskawa representative.
(9) Alarm Nos.: 3151 to 3155 (Phase Detection Error)
The encoder signal cable or the encoder itself will be faulty.
The servo unit detects the error.
Contact your Yaskawa representative.
(10)Alarm Nos.: 3161 to3165 (Absolute Error)
This alarm occurs if the absolute value data cannot be received correctly in one to two seconds
after turning ON the power to the encoder.
The servo unit detects the error.
The encoder or the servo unit will be faulty.
Contact your Yaskawa representative.
(11)Alarm Nos.: 3181 to 3185 (Absolute Position Error)
The number of feedback pulses is checked every turn of the encoder, and this alarm occurs if
there is an error in the number of pulses counted.
The servo unit detects the alarm.
The encoder or the servo unit will be faulty, or malfunction could have occurred due to noises.
Contact your Yaskawa representative.