6
Parallel Wiring Diagrams
In a parallel connection, up to eight UPS Systems are connected to a single load. A parallel connection provides fail-safe redundancy, assuring that the
load is constantly supported even if one or more UPS Systems fail or are taken off-line for maintenance. Within a parallel architecture, there is a “single
loop” connection option (where only one input source is used) and a “double loop” connection option (where two input sources are used). Note: in both
connection options the total length of all cables (input, output and reserve) must be the same for each UPS Power Module to prevent load inequality.
All Models
• Single Loop Connection (one input source used)
• Double Loop Connection (two input sources used)
LOAD
Electrical Connection
Follow all warnings listed in the Safety section prior to hardwire terminal connection. The following checklist provides a general guide rather
than a complete outline of procedures.
Connection Checklist
K
Turn off input power prior to electrical connection.
K
Check the input, output and battery cables for proper amplitude, phase and polarization.
K
Connect ground wire(s) between UPS power module(s) and battery module(s).
K
If the input and output power of the UPS is a Y connection, then note that the Neutral wire and Ground wire are not connected within the UPS
power module.
K
If the input power system has a floating voltage between Neutral and Ground, and if 0 volts is desired between Neutral and Ground within the
UPS power module, Tripp Lite recommends the following: add a user-supplied isolation transformer to the input of the UPS, and connect the
Neutral wire and Ground wire inside the UPS power module.
K
If installing multiple UPS modules in parallel, ensure input and output cables are the same length for each module.
For
Recommended Cable Sizes, Torque Specifications
and
Terminal Wiring Diagrams
,
refer to the
3-Phase UPS Specifications Addendum—50kVA & Above.
