IEMi Operation Mode (option). ABB TLE Scalable UL Series UPS

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4.3.6

IEMi Operation Mode (option)

TLE Scalable Series 40 to 150 UL S1 UPS User Manual / REV-B

Note!

“IEMi - Intelligent Energy Management integrated” and “SEM - Super Eco Mode” Operation Mode are mutually exclusive; they cannot be simultaneously available on a system.

Fig. 4.3.6-1 Functional diagram of an RPA Parallel System in IEMi Operation Mode

ABB offers the IEMi - Intelligent Energy Management integrated option to optimize energy cost while maintaining the highest possible reliability for Parallel Redundant Uninterruptible Power Supply Units (max. 6).

For RPA Parallel System installations, secured with Redundant Parallel Architecture ™ (RPA ™ ), IEMi Operation Mode saves energy by dynamically utilizing the UPS Units as needed to meet the required Load without compromising the power quality to the critical Load.

The software will calculate the number of UPS Units which are needed for Load supply based on following:

• Redundancy (N+1 or N+2) • System Load • Rectifier status

• Inverter operating time • IEMi Operation Mode programming

Particularly, the UPS control logic determines the minimal set of UPSs required to maintain a reliable supply to the critical Load.

Then, an efficiency optimization algorithm determines the best UPS configuration in order to maintain the running UPS in their highest efficiency operating region.

Energy losses are reduced by switching the Inverter section of one or more Units to a stand-by state.

The critical Load is fed by the remaining Units operating in double-conversion.

As Load increases, other Units are gradually switched on-line in order to maintain the required redundancy level.

The IEMi - Intelligent Energy Management integrated option is only available on parallel installations.

It is clear that in order to enjoy the benefits of IEMi operation a system programmed for N+1 redundancy requires a parallel installation of at least three UPSs, while four UPSs are required for N+2 redundancy.

IEMi - Intelligent Energy Management integrated is an option, and it is available only if introduced at the factory, or if introduced in field installations by an ABB GLOBAL SERVICES FIELD ENGINEER.

Benefits of IEMi - Intelligent Energy Management integrated include:

• Higher efficiency (reduced losses) in low-Load conditions (efficiency optimization)

• No compromise on power quality (double-conversion operation)

• No compromise on system reliability (redundant operation).