YASKAWA SGM series User Manual page 362

INSPECTION, MAINTENANCE AND TROUBLESHOOTING
6.2.1 Troubleshooting Problems with Alarm Display cont.
6
352
Display and Outputs
Digital Operator g p
Di Display and l d
Alarm Name Alarm Name
ALO1
A.51
ON
Overspeed
Status When Alarm Occurred
When servo ON (S-ON)
signal turned ON
During high-speed
servomotor rotation
after reference in-
put
Alarm detected at
110% max. speed
Cause
A
• Servomotor wiring incorrect.
• Encoder wiring incorrect (disconnection,
shortcircuit, power supply, etc.)
B Incremental encoder power not supplied
from Servopack.
C Noise in encoder wiring.
D Incorrect user constant (number of encoder
pulses) setting.
E Circuit board (1PWB) defective
Alarm Output
Alarm Code Output
ALO2
OFF ON
A
At power ON
, B, C, D, E
A
, B, C, D, E
Check and correct wiring. (Check A-, B-,
C-phase pulses correct at 2CN.)
Use the Servopack power supply for the
encoder.
Separate encoder wiring from main wiring
circuits.
Set user constant Cn-11 to the correct
number of pulses.
Replace Servopack.
Alarm Output p
ALO3
OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
E
Remedy