006-0006205
UPS-1500 Series
Rev ZC
32 of 60
05/28/2019
Section IV
Multiple UPS Configurations
General Considerations
The UPS supports two different paralleling schemes for the AC output: standard paralleling
and expanded paralleling. With standard paralleling, up to three UPS units can be combined to
function as a single machine. A fault on any one unit will cause the entire system to shut down.
With expanded paralleling, up to 32 UPS units can be combined to form high power single phase,
split-phase and 3-phase systems. An electronic breaker on the hot AC output wire provides
fault-tolerant, glitch-free operation should one UPS unit fail. This allows users to add extra UPS
units to the system for N+1 redundancy, or more generally N+M redundancy.
Standard vs. expanded paralleling is determined by the “AC Output Neutral Wire” option in
the UPS part number. See the table below. Standard paralleling units cannot be mixed with
redundant parallel units in multi-unit systems.
Ordering Information: Standard Vs Redundant Parallel
AC Output Neutral Wire option
Example PN
Single Unit (no paralleling)
-G
UPS-1500-S-1U-W1
G
S00-ECE
Standard Parallel
-F
UPS-3000-S-2U-W1
F
S00-ECE
Expanded Parallel
-R
UPS-1500-S-1U-W2
R
S00-ECE
Note: When combining UPS units into the configurations described in this section, each UPS
must internally have the neutral wire of its AC OUTPUT floating, rather than connected to its
chassis. This requires that all the UPS units have the “F” option for standard parallel units and
“R” option for expanded parallel units regarding the AC OUTPUT neutral wire connection. Check
the UPS part numbers to be sure this is the case before ordering.
Standard Paralleling -F Option
With standard paralleling, up to three SynQor UPS units with identical model numbers can be
combined in various ways to achieve:
• Higher output power
• Higher output voltage
• Multiple output phases
• A balanced or unbalanced load for a 3-Phase AC input source
A configuration-specific CONFIGURATION cable determines each UPS unit’s role in a standard
parallel system. These CONFIGURATION cables are available from SynQor, and the proper part
number for any configuration is given in the pages that follow. These CONFIGURATION cables are
unique to –F option paralleling and cannot be used with –R option UPS units.
