006-0006504 02/27/18
Rev R
30 of 56
UPS-3000 Guide
www.synqor.com
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 an N+1 redundant
system. The system will ride through a fault on any one unit. Contact the factory for single
phase redundant systems with more than three UPS units, or for redundant split-phase and
three-phase systems .
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.
Wiring Caution
WARNING: LETHAL VOLTAGES MAY BE PRESENT ON UPS AC OUTPUT CONNEC-
TIONS. ALWAYS REMOVE BATTERY PACKS AND INPUT POWER BEFORE MAKING
MULTI-UNIT AC OUTPUT CONNECTIONS. ALL AC OUTPUT CABLE CONNECTORS
MUST BE INSTALLED DURING OPERATION AS A DISCONNECTED CABLE CON-
NECTOR MAY HAVE EXPOSED VOLTAGE PRESENT FROM ANOTHER UNIT IN THE
GROUP .
