Al-62:the c-phase signal width is defective, Al-63:pulse number error per one rotation – Yaskawa YASNAC PC NC Maintenance Manual User Manual
Page 81
PC NC Maintenance Manual
Chapter 4: Troubleshooting
4-60
AL-62:The C-phase signal width is defective.
Error Contents
The C-phase signal exceeded 100 pulses at tuning. (encoder method
ORT).
Detection Methods
PG counter latched by the C-phase signal with forward rotation by tun-
ing is memorized. Same manner as above, PG counter latched by the
C-phase signal with reverse rotation by tuning is memorized. Calculate
C-phase signal width from this. If 100 pulses are exceeded, an alarm
will sound.
Cause and measures
AL-63:Pulse number error per one rotation
Error Contents
A pulse per one rotation exceeded 4096±1 at tuning (encoder method
ORT).
When orientation signal ORT is ON in a state of tuning operation selec-
tion bit (C2-22.b4) becomes tuning enable (= 0), minor fault display is
performed due to tuning incompletion AL-60.
Detection Methods
By tuning:
PG counter latched by C-phase signal with forward rotation is memo-
rized. The number of pulse per rotation is calculated from the differ-
ences of the latched PG counter. This value exceeded 4096±1.
Or,
PG counter latched by C-phase signal with reverse rotation is memo-
rized. The number of pulse per rotation is calculated from the differ-
ences of the latched PG counter. This value exceeded 4096±1.
Check three times in forward/reverse direction respectively that the
number of pulses per one rotation is normal.
Cause Measures
Motor and inverter earth is defective.
Check continuity to see that the motor and inverter are
properly grounded.
Improper drive by noise (encoder
cable characteristic defect)
Check encoder signal conductor is isolated from the main
circuit wiring and other power lines.
Check encoder cable specification (twisted-pair shield wire)
[recommended cable “KQVV-SW” by Fujikura-Densen Co.]
Load axis encoder fault
Confirm A, B, and the C-phase pulse by the check terminal
on the orientation card.
Exchange the load axis encoder with a non-defective one.
Control card fault
Exchange unit (exchange control card)