Yaskawa FSP Amplifier - Manual (Page 274)

FSP Amplifier User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
9-9
„ A.10: Overcurrent or Heat Sink Overheated
Display and Outputs
Alarm Outputs
Alarm Code Output
ALO1 ALO2 ALO3
ALM Output
ON OFF OFF OFF
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
During servomotor
operation
At power ON.
When Servo ON
(S-ON) signal is
turned ON.
A, B, D,
E, F, G
C, D
C
Cause of the Problem Solution
A
Shorted wiring between servo
amplifier and servomotor.
Check and correct wiring.
B
Shorted servomotor U, V, or W
phase.
Replace servomotor.
C
Defective circuit board (1PWB)
Defective power transistor.
Replace servo amplifier.
D
Defective current feedback circuit,
power transistor, DB circuit, or
circuit board.
Replace servo amplifier.
E
Ambient temperature of the servo
amplifier greater than 55°C. Alter conditions so that the ambient
temperature is below 55°C.
F
Inadequate airflow around the heat
sink. Providing sufficient space as
specified.
G Fan stopped. Replace servo amplifier.
H
Servo amplifier is operating under
an overload.
Reduce load.
Note: Problems E to H can occur in a servo amplifier with a capacity of 1.5 to 5 kW, and all 400 V models.