YASKAWA SGMAH User Manual page 397

Sigma II User's Manual
A.51
A.51: Overspeed
Display and Outputs
Status and Remedy for Alarm
When Servo ON (S-ON)
signal is turned ON.
A Incorrect servomotor wiring.
Position or speed reference input
B
is too large.
Incorrect reference input gain set-
C
tings.
D Defective circuit board (1PWB).
Alarm Outputs
Alarm Code Output
ALO1 ALO2
ON OFF
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
During high-speed
servomotor rotation
after a reference input.
Cause of the Problem
Chapter 9: Inspection, Maintenance, and Troubleshooting
ALM Output
ALO3
ON
A
At power ON.
B, C
Solution
Check and correct wiring. (Check
for U-, V-, and W-phase wiring
errors.)
Lower the reference input values.
Check and correct parameter set-
tings.
Replace servo amplifier.
9 - 13
OFF
D