006-0007129 10/12/2018
Rev B
33 of 60
UPS-1500 3-Phase Guide
www.synqor.com
Section IV
Multiple UPS Configurations
General Considerations
The UPS supports two different paralleling schemes for load sharing applications: “standard”
paralleling and “expanded” paralleling. With standard paralleling, up to three UPS units can be
combined to function as a single system. 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 in a multi-unit system to
form high power Single-Phase, Split-Phase and 3-Phase configurations. The expanded paralleling
option includes an electronic breaker on the hot AC OUTPUT wire which provides fault-tolerant,
glitch-free operation should one UPS unit fail. The expanded paralleling option allows users to add
extra UPS units to a multi-unit 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.
Note: 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-T1
G
S00-ECE
Standard Parallel
-F
UPS-1500-S-2U-T1
F
S00-ECE
Expanded Parallel
-R
UPS-1500-S-1U-T2
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 units to implement systems
described in this section.
Standard Paralleling “F” Option
With standard paralleling, up to three SynQor UPS units with identical “F” type model numbers
can be combined in various ways to achieve:
• Higher output power
• Higher output voltage
• Multiple output phases
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
