Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 87)

PC NC Maintenance Manual Chapter 4: Troubleshooting
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AL-A4:YENET1200 card error 3
Error Contents] Data transfer (send and receive) error between YENET1200 card and
control card [2ms interruption time-out error from card]
[Cause and measures]
AL-b0:Initial starting point taking-in error
Error Contents C-phase signal cannot be detected after motor is rotating one or more
revolutions when initial starting point input after power supply is ON.
Cause and measures
AL-b1:Encoder pulse number error
Error Contents A B-phase pulse count value from C-phase to the following C-phase
was shifted ±10 pulses or more from the normal value.
Cause and measures
Cause Measures
YENET1200 card connection defect Confirm the YENET1200 card connection (12CN).
YENET1200 card fault Exchange unit (exchange YENET1200 card)
Control card fault Exchange unit (exchange control card)
Cause Measures
Encoder C-phase signal disconnection and
improper connection Check encoder C-phase signal wiring.
Motor encoder fault Exchange the encoder or the motor.
Control card fault Exchange unit (exchange control card)
Cause Measures
Encoder C-phase signal disconnection
and improper wiring Check encoder signal conductor wiring.
Confirm that wether one C-phase pulse goes out per one rota-
tion by rotating motor by hand.
Encoder (built-in motor) adjustment is
defective. In case of built-in motor, readjustment for encoder may able to
be performed.
Improper drive by noise Has the motor and inverter ground been properly wired?
Are the signal conductor and the power line separated?
Is specified twisted-pair shield wire used for the encoder signal
conductor?