Section IV
Multiple UPS Configurations
006-0007129 10/12/2018
Rev B
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UPS-1500 3-Phase Guide
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number for any configuration is given in the following pages. These CONFIGURATION cables are
unique to “F” option paralleling and cannot be used with “R” option UPS units.
Configuration-specific OUTPUT and/or INPUT power cables are also required. These power
cables can be assembled by the user following the wiring diagrams shown below, or they can be
ordered from SynQor using the proper part number given in the pages that follow.
In a standard parallel system, the AC OUTPUT will remain “OFF” until all UPS units are enabled.
Each unit must be enabled by actuating the front panel switch “ON”, or by sending the appropriate
signal over the USER I/O cable. If any UPS unit is “OFF”, all of the UPS units will disable their
outputs. If any UPS unit cannot deliver output power because it cannot draw power from its AC
INPUT, its DC INPUT or its BATTERY, or due to an internal fault, then all of the UPS units in the
system will disable their outputs.
Expanded Paralleling “R” Option
The extended paralleling “R” option adds an electronic breaker to the AC OUTPUT of the UPS
to provide fault-tolerant, glitch-free parallel operation. Should one unit experience a fault that
could otherwise cause the AC OUTPUT to collapse, the breaker disconnects the failed unit from
the AC bus. This configuration allows the remaining units to continue delivering power, provided
that the remaining units can support the load power requirement. This allows users to create
N+1 or N+M redundant systems.
Additionally, the “R” option increases the total number of units in a multi-unit system to 32.
These units can be arranged to form Single-Phase, Split Phase, and 3-Phase systems. Systems
with multiple phases will be N+1 or N+M redundant on each phase.
A failed unit can be removed and replaced while the remaining system unit AC outputs are active.
Special consideration must be taken when connecting the outputs to avoid electric shock. It is strongly
recommended that the system AC OUTPUT be disabled before a unit is removed or replaced.
CONFIGURATION cables for two, three, four and five unit Single-Phase systems are offered
as standard products. See the following pages for details. These cables are unique to the “R”
paralleling option, and cannot be used with “F” paralleling option units. Contact the SynQor
factory for Single Phase systems larger than five UPS units.
Systems created using expanded parallel UPS units will be fault-tolerant to the following events:
• Complete loss of a unit’s INPUT power (AC INPUT, DC INPUT or BATTERY)
• Hardware failure of the AC INPUT stage
• Hardware failure of the AC OUTPUT stage
