Section IV
Multiple UPS Configurations
006-0007129 10/12/2018
Rev B
39 of 60
UPS-1500 3-Phase Guide
www.synqor.com
Series Split Phase Connection of AC OUTPUTS
Two “F” type standard parallel UPS units can double the AC OUTPUT voltage by connecting
both units in series. For instance, if each UPS unit is able to provide 115 Vac output, a series
configuration would deliver a 230 Vac output at twice the power level of a single unit. Similarly,
if the UPS units are able to provide 230 Vac output, the series configuration would deliver a 460
Vac output at twice the power level of a single unit.
The center node between the two outputs in the series configuration should be considered the
“neutral” wire, and therefore kept at a potential al close to Protective Earth Ground (PEGND).
The other two AC OUTPUT wires are electrically “hot” (meaning at a high potential relative to
the neutral or PEGND). One will be phase-shifted by 180 degrees (one-half cycle) from the other,
meaning that when one hot wire is at its positive peak the other is at its negative peak, and
vice versa. The voltage between these two hot wires is therefore twice that of either hot wire
compared to the neutral wire. This configuration is called “Split-Phase”. When ordering, select
the “F: Floating” option for the UPS units.
Contact the SynQor factory for N+1 expanded redundant Split-Phase systems. The wiring diagram
for the AC OUTPUT cables and the CONFIGURATION cable for the Split-Phase configuration is
shown below:
L2
N
PEGND
L1
N
PEGND
AC OUTPUT
AC OUTPUT
REAR PANEL
REAR PANEL
Line 2
Line 1
L2 L1
N
TO LOAD
PEGND
CONFIGURATION cable SYN-9313
If the user is providing the AC OUTPUT cable, all the cable sections should have the following
minimum wire size, depending on whether the AC OUTPUT of the individual UPS units is 115 Vac
or 230 Vac.
UPS AC OUTPUT Voltage
Cable Minimum Wire Size
115 Vac
#14 AWG (2.5 mm
2
)
230 Vac
#16 AWG (1.5 mm
2
)
