Compatible with marine environments 

The basic building block is a 20 KVA/KW module. Its connection clamps are laid out so that the communication signal connections are segregated and separated from the power connections (inputs, output, battery), thus ensuring complete immunity from interference generated by the power supply grid, which is typically disturbed in industrial environments. The module has a front to back air flow, realized by a smart ventilation principle, which manages the fan speed and airflow in accordance with the room temperature and load level. The Sentryum Rack Marine cabinet is available in 2 versions, single phase and three phase output; it is designed to house up to 3 modules (60 KVA/KW) and it can be connected in parallel for a total of 8 modules and 160 KVA/KW of power. The Sentryum Rack Marine cabinet has a distribution panel that contains all the devices to disconnect each module (3 input rectifier disconnectors, 3 input bypass disconnectors, 3 output disconnectors, 3 battery fuse holders), as well as a manual maintenance bypass that isolates the 3 modules and guarantees power continuity to the load. The PCBs in each module undergo a coating treatment process. As all components are fully accessiblefrom the front of each module and thanks to the front-to-front air ventilation system, the Sentryum Rack Marine cabinet can be installed right against the wall or back to back. The construction characteristics of the cabinet (fiber laser welded boxtype uprights manufactured from highstrength low-alloy sheet steel), including its basement complete with vibration dampers, make the Sentryum Rack Marine suitable for installation in the most severe environments.The Sentryum Rack Marine cabinet is available in 2 versions, single-phase and three-phase output; it is designed to house up to 3 modules (60 KVA/KW) and it can be connected in parallel for a total of 8 modules and 160 kVA/kW of power.

The Sentryum Rack Marine cabinet has a distribution panel that contains all the devices to disconnect each module (3 input rectifier disconnectors, 3 input bypass disconnectors, 3 output disconnectors, 3 battery fuse holders), as well as a manual maintenance bypass that isolates the 3 modules and guarantees power continuity to the load. Both modules and cabinets are provided with the bypass line separated from the rectifier line, ensuring greater availability of the power supply to the UPS system and consequently extending this benefit to the load. Input and Output voltage adapter cabinets are available on request, in order to match all the typical ship requirements and provide the galvanic isolation.

Modular plug & play solution

Sentryum Rack Marine can be purchased as a single 20 KVA/KW module and installed in a 19-inch rack cabinet or mechanical support provided by the user. Another way is to lean the module on the right side the display can be rotated 90° counterclockwise. It is also possible to remote the display (maximum 2 meters) in case the module is fitted inside a cabinet. The power terminals (inputs, output, battery) are connected by front harting connectors, ensuring simplicity and operating safety during insertion/removal, protection against electrical contacts and immunity from environmental conditions typical of marine settings (dust, humidity, suspended chemical particles). The removal and replacement of a faulty module or the addition into the system of a new one can be carried out easily by the user from the front panel.

Flexibility: Stand alone and Rack cabinet

The Sentryum Rack Marine module can be used as a standalone unit or in a parallel configuration, by simply adding the parallel kit for each module, the UPS system can grow as requirements demand (from 20 to160 KVA/KW). Every module is completely independent with regards to the control and management of the operator interfaces, this facilitates all monitoring, control and fault detection operations, ensuring increased reliability in that any malfunctions in parts or accessories will not propagate through the entire system. Sentryum Rack Marine ensures vertical scalability that minimizes the system footprint, the user can thus have power capabilities from 20 to 60 KVA/KW for a single Sentryum Rack Marine cabinet without increasing the footprint. The 20 KVA/KW module in the standalone version is provided with input/output plug-in harting power connectors (inputs, output, battery) with threes meter length loose electrical cable to arrange the cabling according with the installation enclosure. These cables are not provided when the module is ordered to be fitted inside the Sentryum Rack Marine cabinet, because they are already installed inside it as standard, for the maximum expansion of the cabinet, which includes also all the provisions to let the modules operate in parallel. Stand alone module version can be housed in any suitable cabinet or enclosure and it is compatible with standard 19” width.

High efficiency, power availability and reliability

This Series is derived from the Sentryum and essentially inherits its main technologies and standalone module versions:

• Full power rating available up to 40 °C (KVA=KW unity pf) and up to 96.3% VFI efficiency,

• Zero impact source, thanks to a very low input THDi <3%, input pf 0.99, power walk-in function, power walk-in start delay function,

• Up to 20 Amps battery recharging current and wide battery block range (the standard 20+20 battery blocks @12V with Neutral central point can be adjusted from 15+15 to 22+22),

• Three-level IGBT inverter, extremely low output THDv,

• Up to 270% inverter current for 200 msec. and 150% for 300 msec., which 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,

• “Cold start” function for starting the UPS from the battery. In addition, Sentryum Rack 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.

Smart Battery Management

The Smart Battery Management system, compatible with Li-Ion batteries and Supercapacitors, consists of a series of features and capabilities to optimise battery management and obtain the best performance and operating life possible:

• Battery recharging for use with VRLA, AGM, GEL, Open Vented and Nickel Cadmium batteries,

• Availability of different charging methods, like One-level voltage recharge (typically used for VRLA AGM batteries), Two level voltage recharge (according to IU specification) and Cyclical recharge (to

reduce electrolyte consumption and lengthen the life of VRLA batteries),

• Recharge voltage compensation based on ambient temperature,

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

• Deep discharge protection, by increasing the end-of-discharge voltage during extended low-load discharges, as recommended by battery manufacturers,

• Negligible Ripple current (residual AC component at low frequency) by using a high frequency battery charger,

• Wide voltage range for the rectifier operating (up to -40% at half load).

Advanced Communications

Sentryum Rack Marine module is equipped with a coloured graphic touch screen display providing UPS information, measurements, operating states and alarms in different languages. The default screen displays the UPS status, graphical indication of the energy path through the UPS and the operational condition of the various assemblies (rectifier, batteries, inverter, bypass) within the UPS. Furthermore, the user interface includes a UPS status led bar which delivers immediate and clear information regarding the overall status of the UPS by changing the colour (light blue, dark blue, orange and red) according with Sentryum Rack Marine Cabinet (Single-phase model).