Piller UK - Hybrid Rotary UPS Application Design Guidance

Hybrid Rotary UPS Application Design Guidance

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 make the UBR Hybrid Rotary UPS 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%.

UNIBLOCK UBR Hybrid Rotary UPS - Single Line Drawing

Piller UNIBLOCK UBR Hybrid Rotary UPS Guide to Dimensions & Weights