Appendix B: Paralleling UPS Devices
34
Linear Plus Series User Instruction Manual
Appendix B:
Paralleling UPS
Devices
Larger loads may be supported with 12, 16, and 20 kVA Linear Plus kits, created by paralleling two 6, 8, or 10
kVA units respectively. By adding a third UPS, a parallel-redundant system is created.
General information for paralleling UPSs:
• A maximum of 3 UPSs of the following ratings can be connected in parallel: 4 kVA, 6 kVA, 8 kVA, or
10 kVA
• The units to be connected in parallel must be of the same type. All configurable UPS parameters must be
the same.
• On 4 kVA, 6 kVA, 8 kVA, and 10 kVA: check settings of all parallel units. The table on page 21 shows
setup parameters (setup menu 5). The settings of output voltage must be the same.
General information for designing a parallel system:
• UPSs configured as a parallel system must all be configured for single input (same source to both main
and bypass) mode. Jumpers must be installed between JL1 & BL1 and between JL2 and BL2 on each
unit.
• When connecting mains and loads to a parallel UPS system additional distribution has to be taken into
account.
• A system of two parallel UPS blocks can be connected directly to the distribution if the system load
doesn’t exceed the nominal power of the UPS module (configuration: half load, two module parallel
system)
• If the systems load is greater, another UPS must be added to provide the additional capacity.
Fig. 18: Typical Parallel Set Up
