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Operating Basics
How to operate an instrument with two power supplies (Option DPW only)
Power supply status
Temperature weighted
hours (TWH)
36
The standard instrument has one Power Supply module installed. With Option
DPW, a second hot-swappable, redundant (backup) Power Supply module is
provided. When two Power Supply modules are installed in the instrument, one
module is configured as the primary supply and the other is configured as the
backup supply.
In the event that the primary supply fails, the backup supply automatically
provides power to maintain instrument operation. You can remove and replace
a failed supply without having to remove the instrument from operation. (See
page 39, To hot-swap a Power Supply module.)
If you need to remove one of the two supplies for repair and you do not have a
replacement supply available, be sure to install a blank power supply cover into
the empty power supply slot (Tektronix part number 333-4724-XX).
The status of the Power Supply modules can be viewed from the front of the
instrument. On the front panel, the AC and DC indicators illuminate using various
colors to show the status of the Power Supply modules. (See page 25, Power
Supply module LED states.)
You can use the SYSTEM CONFIG menu to perform a load test on the backup
supply. You can use the DIAGNOSTICS menu to view voltage levels in the
instrument.
The instrument keeps track of the age of a Power Supply module by calculating
the temperature weighted hours (TWH). You can view the TWH of each installed
supply using the DIAGNOSTICS submenu in the SYSTEM CONFIG menu.
TWH calculation method. When the outside air temperature is at 25 °C or
cooler, the Power Supply module is expected to last 15 years. As the outside air
temperature rises to the maximum operating temperature of 50 °C, the expected
life of the supply decreases to 5 years. Every hour, the instrument measures the
supply temperature and increments the temperature weighted hours count in
response to the measured temperature.
When the TWH value reaches a value of 131,400 hours, then an entry will be
made in the Event Log and notifications will be sent using the enabled reporting
methods (SNMP trap, e-mail, GPI signal, instrument beeper).
NOTE.
When two Power Supply modules are installed, the active supply runs
warmer than the backup supply. Therefore, the TWH of the active supply will
increase faster than the backup supply.
ECO8000 Series Automatic Changeover Unit User Manual
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