Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.7A
A.7A: Heat Sink Overheated
Heat sink temperature exceeds 100°C.
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
Note: Larger servo amplifiers (1.5kW., or larger) will display alarm A.10 if the
heat sink overheats.
Alarm Outputs
Alarm Code Output
ALM Output
ALO1 ALO2 ALO3
ON ON ON OFF
Cause of the Problem Solution
A
The ambient temperature of the
servo amplifier exceeds 55°C.
Alter conditions so that the ambi-
ent temperature goes below
55°C.
B
Inadequate air flow around the
heat sink .
Provide sufficient space as speci-
fied.
C Fan stopped. Replace servo amplifier.
D
Servo amplifier is operating under
overload.
Reduce load.
E Defective servo amplifier. Replace servo amplifier.
During servomotor
operation.
When control power
is turned ON.
E
A, B
C, D
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