A.f1, Display and outputs, Status and remedy for alarm – Yaskawa Sigma II Series Servo System User Manual
Page 422
Sigma II User’s Manual
Chapter 9: Inspection, Maintenance, and Troubleshooting
9 - 34
A.F1
A.F1: Power Line Open Phase
Display and Outputs
Note:
OFF:
Output transistor is OFF (alarm state).
ON:
Output transistor is ON.
Status and Remedy for Alarm
Note:
A and B tend to occur in a servo amplifier with a capacity of 500W or
higher.
Alarm Outputs
Alarm Code Output
ALM Output
ALO1
ALO2
ALO3
OFF
ON
OFF
OFF
Cause of the Problem
Solution
A
One phase (L1, L2, or L3) of the
main circuit power supply is dis-
connected.
• Check power supply.
• Check wiring of the main circuit
power supply.
• Check MCCB, noise filter, mag-
netic contactor.
B
There is one phase where the line
voltage is low.
Check power supply.
C
Servo amplifier defective.
Replace servo amplifier.
When the main circuit’s
power supply is turned ON.
When the control power
is turned ON.
C
A, B