Vega - 1ph 0.3-25kVA electro-mechanical digitally controlled

SKU: 12

Vega is a single phase electro-mechanical stabilizer. The electromechanical stabilizers are digitally controlled and are made essentially of buck-boost transformer, voltage regulator and electronic control. By means of the digitally controlled system, the stabilizer is able to compensate for a widely fluctuating incoming voltage stabilizing it within a ±0.5% accuracy range in relation to the rated value. Based on a microprocessor sampling the output voltage at high frequency, the control system operates the voltage regulator motors in order to guarantee the voltage stability. The electromechanical stabilizers are often used in industrial installations, or installations of big nominal power, where the most important criteria are endurance in very high or very low voltages and a high degree of stabilization. Vega stabilizers are available for different ranges of input voltage fluctuation. Standard models offer a double input connection so that with the same unit two different input variations (±15%/±20% or ±25%/±30%) can be dealt with. An automatic circuit breaker is provided on the regulation circuit to protect against overload and short circuit on the voltage regulator whilst the auxiliary circuit is protected by fuses. The instrumentation consists of a digital multimeter installed on the cabinet front panel. The alarms (min/max output voltage, gearmotor lock, internal overheating, regulator overload) are recognizable LCD display on the control card. The control logic is based on a digital microprocessor. All Vega stabilizers are fitted with the same control card, thus simplifying maintenance operations and spare parts storage.

Technical brochure

Characteristics

Selectable output voltage (dip-switch) - 220-230-240V
Output voltage accuracy ±0,5%
Frequency 50Hz ±5% or 60Hz ±5%
Admitted load variation - Up to 100%
Cooling Natural ventilation
Ambient temperature -25/+45°C
Storage temperature -25/+60°C
Max relative humidity <95% (non condensing)
Admitted overload 200% 2min.
Harmonic distortion - None introduced
Colour RAL 7035
Protection degree IP 21
Instrumentation Output digital voltmeter
Installation Indoor

*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.

Main components

Buck/boost transformer

Often referred to as ‘booster’ transformer, it is a standard dry-type transformer with the secondary winding connected in series to the mains and the primary winding supplied by the voltage regulator.

Voltage regulator

Basically, it is an autotransformer with continuously variable transformer ratio. The voltage intake varies depending on the position of the rolling contacts; therefore the voltage supplied to the booster transformer primary winding also varies. Being the voltage across the regulator contacts (and consequently that on the secondary winding of the booster transformer) either in phase or in opposition to the supply voltage, it is then added or subtracted to the supply voltage, thus compensating its variations.

Auxiliary circuit with microprocessor

The DSP (Digital Signal Processor) microprocessor-based control circuit (specifically designed for drives with totally digitalised signal) compares the output voltage value to the reference one sampling it 2000 times per second. When an anomaly is detected, the control drives the voltage regulator gearmotor. By doing so, the regulator rollers change their position thus varying the voltage drawn and supplied to the buck/boost transformer primary winding. The input voltage variation is therefore automatically compensated. The control system and the construction methods of the machine ensure that the output accuracy is ± 0.5%.

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