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the LED is on, it indicates the fan has failed. When the LED is off, it
indicates the fan is functioning properly.
Figure 3-8: Cooling Module LEDs and Cooling Fan Locations
The A16F-R2422 has a novel approach to stabilizing the temperature within
the subsystem: When the intelligent sensors on the backplane detect higher
temperature, such as high ambient temperature or the failure of any cooling
or PSU module, the system will turn the cooling fans to high speed to
extract more heat. Once the ambient temperature cools down to normal or
the cooling or PSU modules have been replaced, the cooling fans will return
to low speed.
3.3 Audible Alarm
Different controller environmental and operational parameters (like
temperature, etc.) have been assigned a range of values between which they
can fluctuate. If either the upper or lower thresholds are exceeded, an
audible alarm will automatically be triggered. The alarm will also be
triggered when an active component on the A16F-R2422 fails. If the A16F-
R2422 manager is onsite and hears an alarm, the manager must read the
error message on the LCD screen or PC terminal to determine what has
triggered the alarm. After determining what has occurred, the manager must
take appropriate actions to rectify the problem.
If an alarm is triggered, it is necessary for you to determine the problem.
If the audible alarm is ignored and the problem is not rectified,
unexpected damages may occur.
Subsystem Monitoring
WARNING!
Chapter 3: Subsystem Monitoring
3-9
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