Category: Piller UPS Application Design Guidance 1
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UPS Application Design Guidance 1
UNIBLOCK UBR Hybrid Rotary UPS - Operation
UNIBLOCK UBR Hybrid Rotary UPS - Single Line Drawing
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%.
Piller UNIBLOCK UBR Hybrid Rotary UPS Guide to Dimensions & Weights
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Piller (UK) Ltd
91 Chesterton Lane
Cirencester
GL7 1YE
Tel: 01285 657721
Fax: 01285 654823
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