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Chapter 3: Controller Monitoring
Audible Alarm 3-3
3.3. Audible Alarm
Different controller environmental and operational parameters (i.e., temperature, etc.)
have been assigned a range of values within 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 of the SR 170 controller fails. If
the SR 170 controller manager is onsite and is alerted by the alarm, the manager needs to
read the message on the LCD screen or on the PC terminal to determine what has
triggered the alarm. After determining what has occurred, the SR 170 controller manager
must take appropriate actions to rectify the problem.
WARNING:
Whenever an alarm is triggered, you must determine the problem. If the audible alarm
is ignored or not taken seriously and the problem is not rectified, permanent damage
to the controller can result.
3.3.1 Default Threshold Values
Table 3-2 shows the default threshold values for the SR controller. If any of these values
are surpassed the alarm will sound:
Parameter Upper Threshold Lower Threshold
+3.3V
+3.6V +2.9V
+5V
+5.5V +4.5V
+12V
+13.2V +10.8V
CPU Temperature
90ºC 0ºC
Board Temperature
90ºC 0ºC
Table 3-2: Default Threshold Values
The thresholds in Table 3-2 are the default threshold values and can be changed. For
instructions on how to change these values, please refer to the Generic Operation
Manual that came with your system.
3.4. I
2
C Port (Enclosure Monitoring)
The I
2
C interface is designed for Infortrend Simple Enclosure Management Service
(ISEMS). FW supports monitoring of remote enclosure devices (power, fan rotation
speed, temperature, etc.) through SAF-TE, S.E.S, or I
2
C interface. Via the I
2
C interface,
the controller collects signals from remote sensors and notifies the system administrator if
the signals exceed any critical thresholds.