Yaskawa SGDB User Manual
Page 534
6.2 Troubleshooting
525
J
A.F3
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.F3
Power loss error
OFF
ON
OFF
OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
Status When Alarm Occurred
A, B
At main circuit power
supply ON.
During servomotor
operation
A, C
Cause
Remedy
A
Although power loss alarm is not
necessary, its parameter is set valid.
Set the parameter Cn-01 bit 5 to 0
B
Time between turning power OFF and back
ON was shorter than 0.5 second.
After turning power OFF, wait for at least
0.5 second, before turning the power back
ON.
C
If any of the following power supply
conditions are met during motor operation:
• Complete power failure : half cycle of sup-
ply frequency
• Voltage drop: full cycle of supply frequency
Note Because of detector lag or detector
margin, there may be no alarm even if
the above values are exceeded.
Check the power supply.
Terms
• Complete power failure=Power failure
where voltage drops to zero.
• Voltage drop=Power failure where voltage
drops, but not to zero.
6