Yaskawa SGDB - Manual (Page 517)

INSPECTION, MAINTENANCE, AND TROUBLESHOOTING
6.2.1 Troubleshooting Problems with Alarm Display cont.
508
J A.31
Display and Outputs
Digital Operator
Di l d
Alarm Output g p
Display and
Alarm Name
Alarm Code Output Alarm Output
Alarm Name
ALO1 ALO2 ALO3
p
A.31
Position error
pulse overflow
ON ON OFF OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
Status When Alarm Occurred
A
During servomotor
operation
Overflow during
high-speed opera-
tion
No feedback pulse
returned after refer-
ence pulse input.
Normal operation
but overflow when
large reference in-
put.
At power ON
B
,
F
C
,
D
,
E
F
Cause Remedy
A Servomotor wiring incorrect. Check and correct wiring. (Check A-, B-,
C h l 2CN )
B Encoder wiring incorrect (disconnection,
shortcircuit, power supply, etc.)
g ( , ,
C-phase pulses correct at 2CN.)
C SERVOPACK adjustment incorrect Increase speed loop gain (Cn-04) and/or
position loop gain (Cn-1A).
D Servomotor overloaded Reduce load torque and inertia. Otherwise,
replace with larger capacity servomotor.
E Position reference pulse frequency too
high
• Decrease reference pulse frequency.
• Use smoothing function.
• Change electronic gear ratio.
F Circuit board (1PWB) defective. Replace SERVOPACK.
6