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14 Installation Guide APC Silcon 480kW 400V UPS
990-4053
External Connection
The built-in parallel board connects two or more UPS systems in parallel, either to obtain
increased system reliability or to obtain higher output power. The parallel board also ensures
correct load-sharing between paralled systems.
To prepare the UPS for parallel/redundant mode, disconnect all sources of AC and DC power
supply to the UPS and connect the ribbon cable from the parallel board to the main controller
board (the ribbon cable is delivered with the UPS).
Complete the parallel system set-up by connecting the external control cables (see below).
Follow the instructions in the “Programming Parameters for Advanced Parallel” section of this
guide to execute necessary re-programming.
NOTICE!
For reliability reasons, APC recommends separate battery packs in redundant/parallel
conigurations.
CAUTION!
DO NOT connect ribbon cable between controller and parallel card in single configurations.
Ribbon cable is for parallel operation only.