A.f1: power line open phase – Yaskawa FSP Amplifier User Manual
Page 300
FSP Amplifier User’s Manual
Chapter 9: Inspection, Maintenance, and Troubleshooting
9-35
A.F1: Power Line Open Phase
Display and Outputs
Alarm Outputs
Alarm Code Output
ALO1 ALO2
ALO3
ALM Output
ON ON
OFF
OFF
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
When the main
circuit's power supply
is turned ON.
When the control
power is turned ON.
A, B
C
Cause of the Problem
Solution
A
One phase (L1, L2, or L3) of the main
circuit power supply is disconnected.
•
Check power supply.
•
Check wiring of the main
circuit power supply.
•
Check MCCB, noise filter,
magnetic contactor.
B
There is one phase where the line
voltage is low.
Check power supply.
C
Servo amplifier defective.
Replace servo amplifier.
Note: A and B tend to occur in a servo amplifier with a capacity of 500 W or higher.