Tripp-Lite PDUMH15AT Manuel Du Propriétaire page 8

3. Features
4. Configuration and Operation
4.1 Automatic Transfer Switch
When the Primary and Secondary inputs are both connected to Tripp Lite UPS Systems, the PDU
operates as an Automatic Transfer Switch, providing redundant input power for high availability
applications. Under normal operating conditions, the PDU will distribute power from the Primary input
source, switching to the Secondary input source under certain conditions. The PDU will switch to the
Primary source whenever it is Good according to the PDU input voltage definitions (see below).
4.1.1 Preferred Configuration
The Automatic Transfer Switch function provides
increased availability when the Primary and
Secondary inputs of the PDU are connected to
separate Tripp Lite UPS Systems that are
connected to separate utility power sources. For
maximum availability, Tripp Lite recommends
using matching SmartOnline UPS Systems with
pure sine wave output for the Primary and
Secondary input power sources. The automatic
transfer switch function will be compromised if the
primary and secondary inputs are connected to the
same utility power source.
Warning: DO NOT connect the primary input
to a line-interactive UPS, due to transfer time
issues, or to any source that does not supply a
pure sine wave. Such sources may be used to
power the secondary input.
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( continued )
Cable Retention Tray (Models PDUMH20HVAT &
PDUMH20HVATNET): Tie the Primary and Secondary Input cords to
the Cable Retention Tray. Once you've secured the two cords together
and ensured that the Secondary cord has a comfortable amount of slack,
insert the Secondary cord outlet into the IEC power inlet.
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Utility B
Facility Circuit
Facility Circuit
Secondary UPS
Secondary Input Cord Primary Input Cord
Critical Equipment
Loads
Utility A
Primary UPS
PDUMH15ATNET
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