Tripp Lite PDUMNH30HVAT2 OWNER’S MANUAL

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Facility Circuit

PDUMH30AT

Critical Equipment

Loads

Secondary UPS

Primary UPS

Primary Input Cord

Secondary Input Cord

Utility B

Utility A

Configuration and Operation

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).

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.

Automatic Transfer Switch Source Selection

The PDU will power up if one of the input sources is greater than the minimum startup

voltage. In normal operation (after power-up), if the presently selected source (primary

or secondary) degrades to a lesser condition, the unit should switch to the alternate

source, if that source is of better quality. The unit prefers the primary source, and will

always switch to it in the event both sources are of the same (fair or good) quality. If

the present source is becoming bad and the alternate source is at least fair, the unit

will switch to the alternate source.

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Tripp Lite PDUMNH30HVAT2 5.8kW 208/240V Single-Phase ATS/Monitored PDU - 16 C13, 2 C19 & 1 L6-30R Outlets, Dual L6-30P Inputs, 10 ft. Cords, 2U, TAA

OWNER’S MANUAL - Page 19