Yaskawa SGDB - 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.
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