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8. OPERATING PROCEDURES FOR PARALLEL SYSTEMS
8.1. Introduction
Pyramid DSP UPS Systems are designed according to high MTBF figures with increased reliability
but in case of necessity, a second ( or more ) Pyramid DSP UPS’s can be connected in parallel
redundant configuration for supplying the very critical load to increase the reliability. Maximum
4pcs identical power and specification Pyramid DSP can be connected in parallel.
If power demand increases in a certain UPS application exceeding the power rating of an already
installed stand-alone UPS, then a second (or more) UPS of the same model and power rating can be
added in parallel to the existing UPS to increase the output power capacity.
The AC inputs of all UPS’s in the parallel system are connected to the same mains, and all the AC
outputs are connected to each other. Each UPS has its own battery group. The critical load is
connected to the common output of the parallel system. There are also some signal cable
connections between the UPS units necessary for parallel operation, and will be described later.
8.2. Procedure for Commissioning and Start-Up (First Installation)
I. If the UPS’s will be converted to parallel systems on site, after installing the parallel kit to each
ups, calibration of them should be made perfectly at single mode initially.
II. Before switching on the ups’s, make sure that electrical connections have been made as shown
in below diagram:
(OUTPUT CONNECTION OF PARALLEL UPS SYSTEMS)
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