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Piller UK - UNIBLOCK™ UPS Application Guide

UNIBLOCK™ - UBT+ - Rotary UPS - Sinusoidal Voltage - UBR Hybrid - Thyristor Switch

UNIBLOCK™ UBT+ Rotary UPS - Operation

In normal operation, the load is supplied via the choke, with the Piller UNIBLOCK™ machine operating in parallel via the central tapping of the choke. The generator winding of the UNIBLOCK™ machine supplies the load with the same dynamic characteristics as an AC supply system.

In the event the supply falls outside the input characteristics, the input contactor opens and the module is supplied from the energy store via the UNIBLOCK™ machine.

The choke acts as a filter preventing the transmission of harmonics to the mains from the load and vice versa. The UNIBLOCK™ generator windings are used to supply reactive current, improving the UPS input power factor.

The generator of the UNIBLOCK™ machine can supply peak currents without being limited by the current ratings of additional semiconductors. The impedance of the generator – which is similar to that of the AC line – delivers a short-circuit current of up to 18 times the rated current without switching back to mains (even when operating in energy storage mode).

The UNIBLOCK™ machine generates a sinusoidal voltage so no power capacitors are necessary for commutation or filtration. The brushless excitation of the motor/generator is provided by an exciter mounted on the shaft and the generator voltage is electronically regulated.

The technology, combined with no capacitors and control redundancy, makes the UBT+ Rotary UPS one of the most reliable UPS available.

In addition, since the UPS operates via the choke, it achieves efficiencies up to 97% and improved efficiencies at partial loads.

UNIBLOCK™ UBR Hybrid Rotary UPS - Operation

Normal operation is through the static switch (thyristor) path (Mains 2). The thyristor switch is controlled so that active power flows only in the direction of the motor of the UNIBLOCK™ machine. The generator of the UNIBLOCK™ machine supplies the load with the same dynamic characteristics as an AC supply system.

In the event of a fault in the thyristor switch, the UNIBLOCK™ machine is supplied exclusively by the rectifier and inverter circuit (Mains 1). Similarly, during a failure of the rectifier/inverter circuit, the UNIBLOCK™ machine is supplied by the thyristor switch. In the event of a mains failure, the UNIBLOCK™ machine is fed via the battery and inverter with the input contactors opened.

The generator of the UNIBLOCK™ machine can supply peak currents without being limited by the current ratings of additional semiconductors. The impedance of the generator which is similar to that of the AC line delivers a short-circuit current of up to 18 times the rated current without switching back to mains (even when operating in battery mode).

The motor voltage provides natural commutation for the inverter and the UNIBLOCK™ machine generates a sinusoidal voltage so no power capacitors are necessary for commutation or filtration. The brushless excitation of the motor/generator is provided by an exciter mounted on the shaft and the generator voltage is electronically regulated. The internal redundancy combined with no capacitors and control redundancy makes the UBR Hybrid Rotary UPS one of the most reliable UPS available. In addition, since the UPS does not normally operate through the double conversion path, it achieves efficiencies in excess of 95%.

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Hybrid Rotary UPS

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Piller UK Ltd
Westgate
Phoenix Way
Cirencester
Glos GL7 1RY

Email Piller UK

Tel: 01285 657721
Fax: 01285 654823

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