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