MaxPower Corp GE SG Series 225-750kVA - Manual (Page 8)

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.
Redundant Parallel Architecture™ (RPA) System Configuration
GE’s RPA TM System
Inside each UPS Module is:
• Bypass Reactor &
Conditioning
• RPA Control/
Communications
• 100% Rated Static Switch
Over 8,000 RPA UPS Systems
installed globally!
RPA TM System Advantages
No Single Points of Failure
The RPA system provides complete redundancy of all critical
components, allows paralleling of up to 6 units for increased
load capacity or redundancy.
Patented Bypass Reactor Design
Ensures excellent output voltage regulation between paralleled
modules and assists bypass line conditioning
Scalable and Modular
The system can be easily expanded for higher capacity and
redundancy without any interruption to the critical load or
transfer to bypass. Redundant Communication
Redundant high speed bus and control electronics provide
higher system reliability.
Distributed Control Logic
Each module in an RPA system has its own operational
controller. Each one continuously communicates with all
others in order to manage the entire system like a team.
Online Maintenance
N+1 configurations allow maintenance on any single module in
the system while other modules provide online protection with
battery backup.
Sequential Soft Start
Provides sequential soft start of each module to reduce
instantaneous load on input feeders during mains recovery.
This helps avoid over-rating of generator and overheating of
cable and fuses.
RPA Cable Saver
UPS Module input and output cable length variation up to 10%
between modules. With eBoost technology this cable length
flexibility is increase up to 25% between modules. This feature
will save up to 20% in UPS installation costs.
Smaller Footprint
RPA eliminates centralized control and external static bypass
cabinet.