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4.3.2 Features of RPA Parallel System
MegaFlex 1000 to 1600 RPA Parallel System is designed to provide a complete Redundant Parallel Architecture
and is free from common equipment.
Not only the Inverters but also the Bypass functions are redundant.
When one UPS needs maintenance or service, the Load is powered by the other Units.
The redundant communication bus to which all Units are connected keeps each Unit informed about the status of
all the other Units.
The Control Panel located on each Unit allows controlling and monitoring the status of this Unit.
4.3.3 System control
A High-Speed Redundant and Serial Communication Bus guarantees the exchange of data and thus the
communication between the CPU's of each Unit
Each Module controls is own function and operational status and communicates with all other Modules, in order
to act or react if necessary, adapting to the new conditions.
4.3.4 Synchronization
All Units are identical, but one Unit is arbitrarily selected as the reference and all the other Units synchronize to
this Unit, which in turn synchronizes to the Utility Bypass voltage, as long as the latter is within tolerances.
In case of reference failure, another Unit in the RPA Parallel System is automatically chosen to take over the
reference role.
The Bypass Input for all the Units of the RPA Parallel System must be supplied from the same AC source (no phase
shift allowed between them).
4.3.5 Load sharing
On each Unit of the RPA Parallel System, Inverter Output Voltage and Current are measured and applied to a Load
sharing bus.
An eventual difference between the Units is therefore automatically equalized.
Note!
As indicated in this manual, the "Q1 - External UPS Output Circuit Breaker" with dedicated Auxiliary
Contact to be connected to the UPS is required. See Section 4.11.2 of the Installation Guide.
It is strongly recommended that no Transformers, Automatic Circuit Breakers or Fuses should be
installed between the Units Output and the Load Common Bus Bars, except the "Q1 - External UPS
Output Circuit Breaker" as mentioned above.
MegaFlex 1000 to 1600
UPS User Manual / REV-A
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