YASKAWA SGM-A3 - Page 408

INSPECTION, MAINTENANCE, AND TROUBLESHOOTING
6.2.1 Troubleshooting Problems with Alarm Display cont.
396
Cause Remedy
A Load inertia high and motor speed too high
• Change operating conditions.
• Use external regenerative resistor or re-
generative unit. (Refer to 3.8.4.)
B Load exceeds capacity of regenerative unit Change operating conditions.
C Servomotor speed too high Reduce motor speed.
D Servopack defective Replace Servopack.
E Input voltage too high Change input voltage to normal value.
F Circuit board (1PWB) defective. Replace Servopack.
D Display and Outputs
Digital Operator
Di l
d
Alarm Output
g
p
Display and
Alarm
Name
Alarm Code Output
Alarm Output
Al
arm
N
ame
ALO1 ALO2 ALO3
p
A.51
Overspeed
ON OFF ON OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
Status When Alarm Occurred
A
,B,C,D,E
When servo ON (S-ON)
signal turned ON
During high-speed
servomotor rotation
after reference in-
put
Alarm detected at
110% max. speed
At control power ON
E
A
,B,C,D,E
Cause Remedy
A
• Servomotor wiring incorrect.
• Encoder wiring incorrect (disconnection,
short, power supply, etc.)
Check and correct wiring. (Check A-, B-,
C-phase pulses correct at 2CN.)
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 Incorrect user constant (number of encoder
pulses) setting.
Set user constant Cn-11 to the correct
number of pulses.
E Circuit board (1PWB) defective Replace Servopack.
6