Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.10
A.10: Overcurrent or Heat Sink Overheated
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
Note: Problems E to H can occur in a servo amplifier with a capacity of
1.5 to 5kW, and all 400V models.
Alarm Outputs
Alarm Code Output
ALM Output
ALO1 ALO2 ALO3
ON OFF OFF OFF
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 cir-
cuit board.
Replace servo amplifier.
E
Ambient temperature of the servo
amplifier greater than 55°C.
Alter conditions so that the ambi-
ent temperature is below 55°C.
F
Inadequate air flow 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.
When Servo ON (S-ON)
At power ON.
During servomotor
operation.
ssignal is turned ON.
A, B, D,
C
C, D
E, F, G
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