Operating Basics
Fault and event
descriptions
The following t
able describes the faults and events that may be reported by the
instrument.
Table 17: Faul
t and event descriptions
Fault or event Description
Primary fault One or more of the active primary input channels is being
driven by a signal that is below the configured level threshold
for that channel
Backup fault One or more of the active backup input channels is being
driven by a signal that is below the configured level threshold
for that channel
Pri/Backup switch The instrument has switched sources from primary to backup
(or vice-versa), either manually or automatically
PS<1 or 2> LD test fail The indicated Power Supply module has failed the last manual
or automatic load test (load tests are run every 24 hours
during normal operation if two power supplies are installed)
PS<1 or 2> AC fault The AC input to the indicated power supply has failed
PS<1 or 2> DC fault The 12 V DC output of the indicated power supply has failed
(reported only on supplies which have a power input)
PS<1 or 2> fan fault The fan in the indicated power supply has failed
PS<1 or 2> warning The 12 V D C output level on the indicated supply is above
or below the nominal range
PS<1 or 2> temp fault
The indicated power supply is over temperature
PS<1 or 2> TWH warning The TWH (Temperature Weighted Hours) limit has been
exceeded on the indicated power supply (See page 36,
Temperature weighted hours (TWH).)
PS switchover On instruments with two Power Supply modules, the
instrument has switched from using one supply to using the
other supply
Board supply
A power supply has failed on the indicated circuit board (See
page 50, Diagnostic board voltage error codes.)
Temperature fault
The instrument is being operated at too high a temperature
Back test due
The recommended test interval for checking the backup
channels has been exceeded
Post failed A failure was detected during the power on self test (See
page 27, Power-on self test.)
HREF relay fail A relay failure was detected on one of the HREF channels
Reboot normal The instrument was rebooted manually
Reboot watchdog
The CP U (Configuration and Monitoring system) was rebooted
automatically when its watchdog signal was not detected
ECO8000 Series Automatic Changeover Unit User Manual 49
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