EXTENSIVE RANGE OF SOLUTIONS

Sentryum has been conceived to optimise the specific requirements by enhancing the installation flexibility. Riello UPS offers Sentryum in four different frame solutions to satisfy any critical power demand and application. Three of the frame types are available for the Sentryum 10-60 KVA/kW power ratings:

Compact (CPT): this cabinet frame is specifically devised to offer a compact but efficient solution for tailored applications, thanks to the ultimate technologies applied, this solution offers unmatched power (up to 20 KVA @ pf 1) and autonomy (12 minutes of backup time at typical load) in an extremely reduced space.

Active (ACT): this solution offers an optimised degree of flexibility to meet different power requirements and battery autonomies. The solution offered is extremely compact but exceptionally powerful, with the possibility to deliver up to 60 KVA (@ pf 1). The ACT model allows to build one or two levels of internal battery backup time (NB this does not apply to the 60 KVA/kW model, which does not allow the installation of internal batteries).

Xtend (XTD): this version is the most flexible solution available to meet various installation requirements and power demands. In an extremely small footprint, it is possible to build up to three-levels of battery backup time. In addition, the mechanical design makes it possible to

install an isolation transformer or easily change the degree of protection from IP20 to IP21 or even IP31. The installation of a dedicated optional seismic kit allows the XTD model to become compliant to ICC-ES AC 156 (2020) too. The fourth frame is unique for the Sentryum 80-120 KVA/kW power ratings:

S3T 80, S3T 100, S3T 120. The layout of these models doesn’t allow for the installation of internal batteries and transformers. However, as per the XTD model, the mechanical design does make it possible to easily change the degree of protection from IP20 to IP21 or even IP31. In addition, the S3T 80-120 models can become compliant to ICC-ES AC 156 (2020) simply by adding the optional seismic kit.

COMPACTNESS

Modern guidelines and sustainable best practices direct us to conceive and design UPS with a particular focus on the entire product life cycle, applying ultimate but resilient technologies, recyclable materials and miniaturisation of assemblies whilst ensuring the systems’ global reliability,

which is pivotal for any UPS. The internal card layout has been optimised to reduce the number of components, interconnections and space required, whilst at the same time increasing reliability and Mean Time Between

Failures (MTBF), which helps to minimise operational expenditure such as service operations and maintenance costs. The result is an outstanding range of four different solutions providing powerful but compact designs as follows:

Sentryum 10-60 KVA/kW power ratings

• Compact: less than 0.25 m2 footprint and only 0.17 m3 of volume.

• Active: less than 0.35 m2 footprint and only 0.33 m3 of volume.

• Xtend: less than 0.4 m2 footprint and less than 0.5 m3 of volume.

Sentryum 80-120 KVA/kW power ratings

• S3T 80, S3T 100, S3T 120: less than 0.42 m2 footprint and less than 0.67 m3 of volume.

HIGH EFFICIENCY

Sentryum is a true ON LINE double conversion UPS system providing the very highest levels of power availability, flexibility and unrivalled energy efficiency with superior performance for any

small Data Center and mission critical applications. With a full power rating (kVA=kW unity pf), the Sentryum provides the maximum available power without any derating. Thanks to the three-level IGBT inverter topology (constructed using modules rather than discrete components) and innovative digital controls, the Sentryum provides up to 96.6% overall efficiency, whilst maintaining a reduced number of components, connections and ribbon cables, which increases the overall system reliability thanks to a higher MTBF. Riello UPS’ advanced average current mode digital PFC control and state-of-theart three-level NPC inverters work at high frequency (18 kHz for 10-60 KVA/kW, 16kHz

for 80-120 KVA/kW), which contributes to minimising the UPS’s impact on the grid and helps to reduce the overall operational costs and energy bills. Sentryum applies a zero impact onto its power source, whether this is from the mains power supply or a generator, this results in:

• Very low input current distortion <3%

• Near unity input power factor 0.99

• Power walk-in function that ensures progressive rectifier start up

• Start up delay function, to sequentially restart the rectifiers once the mains power supply is restored if there are several UPS within the overall system

• In addition, Sentryum provides a filtering and power factor correction function within the power network upstream of the UPS, thus eliminating harmonic components and reactive power generated by the power utilities.

HIGH POWER AVAILABILITY

Sentryum’s fully rated design delivers full power (kVA=kW) regardless of the load power factor or operating temperature (full-rated power is available up to 40 °C). Furthermore, Sentryum’s advanced digital control makes it possible to deliver up to 270% inverter current for 200 ms and 150% for 300 ms. This high overcurrent availability enables the system to deal with sudden peak loads (without static bypass intervention) and provide the short circuit current if required during operation on battery.

The innovative input stage design provides extremely high battery recharging current, while at the same time an energy efficient conversion process during battery operation to reduce the power wasted and to increase the autonomy time compared to legacy DC/AC converters.

SMART BATTERY MANAGEMENT

Proper battery care is critical to ensure the correct operation of the UPS during emergency conditions. The Riello UPS Smart Battery Management system consists of a series of features

and capabilities to optimise battery management and obtain the best performance and operating life possible.

Battery recharging: Sentryum is suitable for use with conventional hermetically sealed lead-acid (VRLA), AGM and GEL batteries, Open Vented and Nickel Cadmium batteries. Sentryum is also compatible with alternative backup power sources such as Li-Ion batteries and Supercapacitors.

Its superior battery charging current availability, i.e. up to 30 Amperes for the 40-120 KVA/kW power range, means that the Sentryum can be utilised within any extended battery autonomy application.

Depending on the battery type, different charging methods are available:

• One-level voltage recharge, typically used for widely available VRLA AGM batteries.

• Two-level voltage recharge according to IU specification.

• Cyclical recharge system to reduce electrolyte consumption and lengthen the life of VRLA batteries.

The battery management system also incorporates:

• Recharge voltage compensation based on ambient temperature to prevent excessive battery charging or overheating.

• Battery tests to diagnose in advance any reduction in performance or problems with the batteries.

• Deep discharge protection: during extended low-load discharges, the end of discharge voltage is increased – as recommended by battery manufacturers to prevent damage or reduced battery

performance.

• Ripple current: recharge ripple current