Specifications

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3BUS 208 000 R1301 231Troubleshooting
Power Down and DC Power Analysis
If the system resets because of a power down condition, the cause can be determined
by printing out an array of temperature and DC power data through a shell script.
The temperature values within the system are monitored and checked against safety
limits. When a safety limit is violated, the system will issue an alarm message and
record, in a buffer, the current values of all of the temperatures. When the power
down limit is exceeded, the temperature data is again read into the buffer. This
buffer is stored in the /ss01 BRAM disk area so that it is available at the next startup.
Upon startup, the file is read in, where it is available for display using the shell
script command. While several variables may have exceeded their safety alarm
limit, the file shows the snapshot of the data at the moment the first power down
event occurs.
Figure 11-1 on page 232 shows the subsystem temperature report. The information
in italics is not printed, but is shown here to help decipher the somewhat cryptic
labels.
Table 11-5 shows the associated alarm limits for each of the variables.
Table 11-5 Alarm Limits for Each Variable
Figure 11-2 on page 233 shows the historical trend of each microcontroller’s DC
voltages. It is a rotating buffer of the last 20 updates. A snapshot update of all the
DC power on the board is made each time a new high or low value for any of the
DC levels is detected. This check is made every minute. This data can be viewed
periodically by executing the shell script. Reviewing this data is useful in
determining trends in power supply drift.
To print out both reports, at the AVOS shell ($$ prompt), type:
.D/ss01/clm/pwrdninf
The system displays, on the screen and printer (if available), the Power Down report
including the microcontroller temperature and the DC power history for each
microcontroller in the system.
Temperature Categories
Safety limit
(°C)
Power Down
(°C)
All board and platform temperatures 50 65
Basis Weight Temperatures with gap 100 125
Basis Weight Temperatures without gap 130 148
Ash Temperatures with gap 100 125
Ash Temperatures without gap 90 125
Caliper Temperatures 130 148