Redundant Parallel Architecture™ (RPA) System Configuration
GE provides RPA, a unique technology that can parallel UPS modules with true redundancy by eliminating any single point of failure. RPA provides a scalable paralleling technique that reduces operating footprint and increases system reliability by eliminating the need for external paralleling equipment and cabinets (centralized bypass and master control).
One of the UPS modules in the system intelligently takes the leadership role, while the other UPS modules have access to all control parameters. If one UPS fails to operate, the load is automatically redistributed among the others. If the lead UPS fails to operate, then another UPS automatically takes on the leadership role. GE's RPA technology is implemented by distributing the control electronics within each UPS module in the system.
RPA System Advantages
No Single Points of Failure
Scalable and Modular
Distributed Control Logic
Sequential Soft Start
GE's RPA System
Inside each UPS Module is:
Over 8,000 RPA UPS Systems installed globally!
- RPA Control/Communications
- 100% Rated Static Switch
Intelligent Energy Management Integrated (IEMi)
IEMi is a software package which allows RPA systems to save energy and reduce operating costs ($) during low load conditions.
Individual inverters, which are not required to support the load, can automatically be switched off to save energy costs ($).
The IEMi mode can be programmed for various operating modes and the customer defines the degree of redundancy required.
Intelligent Sync Module (ISM)
For System + System (2N) applications, the ISM module is utilized to synchronize the outputs of two modules or two groups of UPS's that are fed from separate and independent sources. This allows the two systems to be synchronized for down-stream switching. The ISM is an intelligent control that is mounted external from the UPS module.
It has the ability to select which system is master and can also send/receive permissive signals from downstream devices. Additionally, the ISM follows the same tradition as RPA with redundancy in all critical components. The ISM communicates via redundant communication cables and has options for redundant power supplies and control circuitry.