Standard features

Voltage stabilisation Independent phase control
Output voltage selectable via display, PC and/or Ethernet* from 210 to 255V (L-N) from 360 to 440V (L-L)
Output voltage accuracy ±0,5%
Frequency 50Hz ±5% or 60Hz ±5%
Admitted load variation Up to 100%
Admitted load imbalance 100%
Cooling Natural air ventilation. Above 35°C aided with fans
Ambient temperature -25/+45°C
Storage temperature -25/+60°C
Max relative humidity 95% (non condensing)
Admitted overload 200% 2 min.
Harmonic distortion None introduced
Colour RAL 7035
Protection degree IP 21
User interface 10″ touch panel (multilingual) remotely available via VNC
Installation Indoor
Regulator overload protection Digital control
Communication system Ethernet / USB / MODBUS TCP/IP
Overvoltage protection Class I input surge arrestor
Class II output surge arrestor
Optimal voltage return through supercapacitors
in case of blackout

* The output voltage can be adjusted by choosing one of the indicated values.
Such choice sets the new nominal value as a reference for all the stabilizer parameters.

  • Interrupting devices
  • Load protection against over/undervoltage
  • Manual by-pass line
  • Total protection kit
  • Input isolating transformer
  • Integrated automatic power factor correction system
  • EMI/RFI filters
  • Neutral point reactor
  • IP54 protection degree for indoor and outdoor installation

Sirius stabilizers are available for different ranges of input voltage fluctuation. In the ±15%/ ±20% and ±25%/ ±30% types, the change of input range is obtained through different internal connections (only up to 2000kVA ±15% and equivalent).

Sirius stabilizers are equipped with columnar voltage regulators which enable the achievement of high ratings (up to 6000kVA) and a solid and reliable construction, thus meeting the most diverse industrial applications.

The Sirius voltage stabilizers regulate the output voltage independently on each phase. Similarly to the other models, they can supply any single-phase, bi-phase and three-phase load even in case of and up to 100% unbalanced load current and asymmetrical mains distribution.

In any case, the presence of the neutral wire is required. The stabilizer can also operate without neutral wire by adding a device able to generate it (D/zn or D /yn isolating transformer or neutral point reactor). The stabilizers are cooled via natural air ventilation, assisted by extracting fans when the cabinet internal temperature exceeds 35°C.

The user interface consists of a multilingual 10″ touch panel (fitted with RS485 port) able to provide with information regarding the status of the lines upstream and downstream the voltage stabilizer (phase and linked voltages, current, power factor, active power, apparent power, reactive power, etc.), the operating status of the stabilizer displaying all the information regarding each phase operating mode (‘power on’; reaching of voltage regulation limits; increase/decrease of voltage regulation, etc.) and the possible alarms (minimum and maximum voltage, maximum current, overtemperature, etc.). The alarm indicators are accompanied by an acoustic alarm.

The display is remotable using VNC software.

It is also possible to communicate with the stabilizer with the Modbus TCP/IP protocol (standard communication protocol between electronic industrial equipment) via an Ethernet connection with RJ45 cable.

The control system is also provided with two USB ports for downloading stored data and uploading new releases of the control card software.

The Sirius stabilizer is provided with an electronic voltage regulator protection system activates in case of overload on the voltage regulator. In such condition the load supply is not interrupted, but the stabilizer output voltage is automatically set to the lower between the mains voltage and the pre-set output voltage. The service continuity is guaranteed, although the voltage is not stabilised. When the overload condition ceases to exist, the stabilizer switches automatically back to regular functioning.

The control logic is managed by two DSP microprocessors (one performing the control and the other one managing the measurements) which obtain the output voltage stabilisation by adjusting its true RMS value.

The whole system is supervised by a third ‘bodyguard’ microprocessor that controls the correct functioning of the other microprocessors.

The unit parameters and reference output voltage value can be set via a PC connection, allowing for promptly dealing in the field with any issues concerning voltage stability.

The output voltage is reset to the minimum value in case of blackout by means of supercapacitor banks in order to ensure the correct shutdown.

All Sirius stabilizers are provided with Class I and Class II SPD surge arrestors.

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