Modular UPS topology and its benefits

June 5th, 2013, Published in Articles: Energize

ABB’s UPS systems are based on decentralised parallel architecture (DPA), which do not share any common components and thus means that each UPS module contains all the hardware and software required for full system operation. The major benefit of a DPA system is very high power availability, as each UPS module has its own independent static switch, rectifier, inverter, logic control, control panel and battery charger. Even the batteries can be configured separately for each module if required. With all of the critical components duplicated and distributed between individual units, potential single points of failure are eliminated. System uptime is further maximised by the true safe-swap modularity of the modules. Increased flexibility is another benefit. Each UPS unit’s availability can be defined as a ratio between its mean time between failures (MTBF) and mean time to repair (MTTR). Modular systems based on DPA are free of single points of failure and maximise the system‘s mean time between failure (MTBF). Quick and simple repair by safe-swapping modules while the UPS is online minimises the system‘s mean time to repair (MTTR). This benefit is key to users, but cost savings accrue as well.

Contact Carel Oberholzer, ABB, Tel 010 202-5727,

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