5.2 Error Diagnosis and Troubleshooting
— 5-7 —
Cause Remedy
A
• Servomotor wiring incorrect.
• Encoder wiring incorrect (disconnection,
short circuit, power supply, etc.)
Check and correct wiring. (Check phase-A,
-B, -C pulses correct at CN2.)
B Incremental encoder power not supplied
from Servopack.
Use the Servopack power supply for the
encoder.
C Noise in encoder wiring. Separate encoder wiring from main wiring
circuits.
D Circuit board (1PWB) defective Replace Servopack.
6. A.70
Display and Outputs
Digital Operator Display Alarm Name Alarm Output
A.70 Overload Output transistor is OFF
(alarm state)
Status when Alarm Occurred
B
,
C
,D
When speed reference
is input
No Servomotor
rotation
During normal
operation
At power ON
D
,E
E
When servo ON (S-ON)
signal turned ON
A
,B,D
Cause Remedy
A Servomotor wiring incorrect or
disconnected
Check wiring and connectors at
Servomotor.
B Encoder wiring incorrect or disconnected Check wiring and connectors at encoder.
C Load greatly exceeds rated torque Reduce load torque and load moment of
inertia. Otherwise, replace with larger
capacity Servomotor.
D Incremental encoder power not supplied
from Servopack.
Use the Servopack power supply for the
encoder.
E Circuit board (1PWB) defective Replace Servopack.
7. A.80
Display and Outputs
Digital Operator Display Alarm Name Alarm Output
A.80 Encoder error Output transistor is OFF
(alarm state)
5
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