Yaskawa Large Capacity Sigma II Series - Manual (Page 369)

8 Inspection, Maintenance, and Troubleshooting
8.2.1 Troubleshooting Problems with Alarm Displays
8-30
„ A.d0
A.d0: Position Error Pulse Overflow
Display and Outputs
Note: OFF:Output transistor is OFF (alarm state). ON: Output transistor is
ON.
Status and Remedy for Alarm
Alarm Outputs
Alarm Code Outputs ALM Output
ALO1 ALO2 ALO3
ON ON OFF OFF
Cause Remedy
A Servomotor wiring incorrect. Check and correct wiring.
B SERVOPACK was not correctly adjusted. Increase speed loop gain (Pn100) and posi-
tion loop gain (Pn102).
C Motor load was excessive. Reduce load torque and moment of inertia.
Otherwise, replace with larger capacity ser-
vomotor.
D Position reference pulse frequency was too
high. • Increase or decrease reference pulse fre-
quency.
• Add smoothing function.
• Correct electronic gear ratio.
E Circuit board (1PWB) defective. Replace SERVOPACK.
At power ON E
During servomotor
operation
Overflow occurs during
high speed rotation
A
Reference pulse is input
properly, but feedback
pulse is not returned.
E
Operation is normal,but
overflow occurs when
long reference is input.
B, C, D