MegaFlex 1000 to 1600 UPS User Manual / REV-A
4.3 RPA Parallel System operation
4.3.1 Introduction to the RPA Parallel System
Fig. 4.3.1-1 Block diagram RPA Parallel System operation
Two or more equal power Units can be paralleled to increase the output power (Paralleling for Capacity) or to
improve the overall reliability of an UPS system (Paralleling for Redundancy).
The outputs of Parallel Units are connected to a common power bus, and in normal operation the Units connected
on the Parallel Bus share the Load equally.
The modular concept of MegaFlex 1000 to 1600 allows parallel operation of up to 6 Units, without using
paralleling switchgear, external bypass circuits or common control circuitry (see Fig. 4.3.1-1).
Parallel Units for Power Capacity
Several Units can be paralleled in order to achieve output power greater than the maximum power of a Single
Unit.
The maximum total power shared between the Paralleled Units is equal to the total installed nominal power.
In the event of a failure of one Unit, the power supplied by the UPS system becomes insufficient and the Load will
be transferred to the Utility Bypass source.
Parallel Units for Redundancy
The nominal power rating of the n out of n+1 Redundant Paralleled Modules must be equal to or higher than the
required Load power.
The Load will be equally shared by the n+1 Units connected on the output bus.
Should one of the n+1 Paralleled Units trip Off-line, the remaining (n) Modules will supply the Load, maintaining
conditioned power to the critical Load.
From this result higher reliability and security for the Load plus a higher MTBF (Mean Time Between Failures).
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