Yaskawa YASNAC PC NC Maintenance Manual Uživatelský manuál stáhnout pdf (Strana 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)

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Yaskawa YASNAC PC NC Maintenance Manual Uživatelský manuál Strana 81