30
The parallel UPS is connected to an AC main power source and contains high current batteries for back up. Therefore
safety precautions must be followed to prevent electrical hazards when operating the parallel UPS system.
Introduction
The CP3150 UPS system can be connected in parallel to increase power capacity or redundancy to the load. Up to 8 units of the
same kVA rating may be configured in parallel.
This feature is an available option and thus can be installed at a later date. Field upgrading should only be installed by a factory
trained and authorized service representative Information contained in this manual includes: Theory of Operation, Planning and
basic electrical installation.
Theory of Operation
The parallel UPS system is automatically regulated by the controllers of the individual UPS modules. The UPS conditions the raw
main power and supplies continuous, clean three-phase power to the critical load/ loads. The UPS will continue to supply clean
power without interruption at the output when the utility power fails. In the event of a main power failure, the UPS will continue to
supply clean power, from the batteries, without interruption.
The UPS modules have cable connections between them to communicate the phase synchronization of the bypass voltages and
shared load current. Phase synchronization is necessary in order to transfer the critical load between the bypass line and inverters.
The transfer from inverters and bypass line functions independently within each individual module in the case of an overload
condition.
A functional block diagram of a multiple module system is shown in
Figure 11 – Parallel configuration
.
Chapter
6
PARALLEL OPTION
