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Sigma II User's Manual
n
A.10
A.10: Overcurrent or Heat Sink Overheated
Display and Outputs
Status and Remedy for Alarm
During servomotor
operation.
Shorted wiring between servo ampli-
A
fier and servomotor.
Shorted servomotor U, V, or W
B
phase.
• Defective circuit board (1PWB) .
C
• Defective power transistor.
Defective current feedback circuit,
D
power transistor, DB circuit, or circuit
board.
Ambient temperature of the servo
E
amplifier greater than 55°C.
Inadequate air flow around the heat
F
sink.
G
Fan stopped.
Servo amplifier is operating under an
H
overload.
Note: Problems E to H can occur using a servo amplifier with a capacity of 1.5 to 3kW.
Alarm Outputs
Alarm Code Output
ALO1
ALO2
ON
OFF
Note:
OFF:
Output transistor is OFF (alarm state).
ON:
Output transistor is ON.
A, B, D, E,
F, G, H
At power ON.
C
Cause of the Problem
Chapter 9: Inspection, Maintenance, and Troubleshooting
ALM Output
ALO3
OFF
OFF
When Servo ON (S-ON)
signal is turned ON.
Solution
Check and correct wiring.
Replace servomotor.
Replace servo amplifier.
Replace servo amplifier.
Alter conditions so that the ambient
temperature is below 55°C.
Providing sufficient space as speci-
fied.
Replace servo amplifier.
Reduce load.
9-8
C, D
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