Yaskawa DR2 Sigma Servo - Manual (Page 407)

6.2 Troubleshooting
395
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 control 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,
short, 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.
D 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.40
Overvoltage
OFF OFF ON OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
Status When Alarm Occurred
A
, D
During servomotor
operation
During motor
deceleration
During normal
operation
At main circuit power ON
B
,
C
, D
E
At control power ON
F
6