YASKAWA SGM-A3 User Manual page 408

INSPECTION, MAINTENANCE, AND TROUBLESHOOTING
6.2.1 Troubleshooting Problems with Alarm Display cont.
6
396
Cause
A Load inertia high and motor speed too high • Change operating conditions.
B Load exceeds capacity of regenerative unit Change operating conditions.
C Servomotor speed too high
D Servopack defective
E Input voltage too high
F Circuit board (1PWB) defective.
D Display and Outputs
Digital Operator g p
Display and Di 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,
short, 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
• Use external regenerative resistor or re-
generative unit. (Refer to 3.8.4.)
Reduce motor speed.
Replace Servopack.
Change input voltage to normal value.
Replace Servopack.
Alarm Output
Alarm Code Output
ALO2
OFF ON
A
At control 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.
Remedy
Alarm Output p
ALO3
OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
E
Remedy