Yaskawa Sigma II Series Servo System - Manual (Page 420)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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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 Output
ALM Output
ALO1 ALO2 ALO3
ON ON OFF OFF
Cause of the Problem Solution
A
Servomotor wiring incorrect or
poor connection
Check wiring and connectors at
encoder.
B
Servo amplifier was not correctly
adjusted.
Increase speed loop gain (Pn100)
and position loop gain (Pn102).
C Motor load was excessive.
Reduce load torque or inertia. If
problem persists, replace with a
larger capacity motor.
D
Position reference pulse fre-
quency was too high.
•Increase or decrease reference
pulse frequency.
•Add smoothing function.
•Correct electronic gear ratio.
E Circuit board (1PWB) defective. Replace servo amplifier.
E A During servomotor operation.
During high speed
When a long reference
rotation.
is entered during
normal operation.
When a properly entered
reference pulse does not
generate a feedback pulse.
At power ON.
A
B, C, D
E