Configuration And Operation; Automatic Transfer Switch - Tripp-Lite PDUMH30AT El Manual Del Propietario

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 that 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.
PDU Power Source Selection Parameters
Nominal Voltage
Minimum Startup Voltage
"Good" Voltage Range
"Fair" Voltage Range
"Bad" Voltage Range
15-07-195-93323D.indb 16
Utility B
PDUMH30AT &
PDUMH30ATNET PDUMH32HVAT & PDUMH32HVATNET
120V
85V
99-139V
75-98V
0-74V
16
Facility Circuit
Facility Circuit
Secondary UPS
Secondary Input Cord
Critical Equipment
Loads
PDUMH30HVAT, PDUMH30HVATNET,
200-240V
163V
172-266V
144-171V
0-143V
Utility A
Primary UPS
Primary Input Cord
PDUMH30AT
9/2/2015 5:08:20 PM