Yaskawa Sigma Mini - Manual (Page 226)

INSPECTION AND MAINTENANCE
5.2.1 Troubleshooting Problems with Alarm Display
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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 input
At power ON
B
,
F
C , D , E
F
Cause Remedy
A Servomotor wiring incorrect. Check and correct wiring. (Check phase-A,
B C l CN2 )
B Encoder wiring incorrect (disconnection,
short circuit, power supply, etc.)
g ( p ,
-B, -C pulses correct at CN2.)
C Servopack adjustment incorrect Increase speed loop gain (Cn-04) and/or
position loop gain (Cn-1A).
D Servomotor overloaded Reduce load torque and load moment of
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.
5. A.51
Display and Outputs
Digital Operator Display Alarm Name Alarm Output
A.51 Overspeed Output transistor is OFF
(alarm state)
Status when Alarm Occurred
A
, B, C, D
When servo ON (S-ON)
signal turned ON
During high-speed
Servomotor rotation
after reference in-
put
Alarm detected at
110% max. speed
At power ON
D
A
, B, C, D
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