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UPS Application Design Guidance 2

UNIBLOCK UBTD Diesel UPS - Operation

Dual output diesel UPS

UNIBLOCK UBTD Dual Output Diesel UPS

In normal operation the load is fed via the coupling choke. The special design of the coupling choke allows a high level of decoupling between the input and output and blocks all harmonics and transient events between the input and output.

The coupling choke is tapped with the UNIBLOCK machine. The generator winding of this synchronous machine ensures the output voltage is kept constant irrespective of the mains voltage. The generator winding feeds the loads with the same dynamic response of an ideal AC supply. Peak currents and high short circuit current (up to 18 times nominal current) can be supplied by the UNIBLOCK machine even in the event of a mains failure.
In the event of a mains failure power flows from the Powerbridge (rotating kinetic energy store) or battery to the load via the UNIBLOCK machine. If the kinetic energy store) or battery to the load via the UNIBLOCK machine. If the mains does not return then the diesel starts and comes up to speed. The overrunning clutch then closes for a soft start. The load is ramped on to the diesel from the Powerbridge/battery. The Powerbridge is then fully recharged and thus enables the full stabilisation function (i.e. the Powerbridge will stabilise the output frequency during load steps on and off the diesel by providing power or absorbing power as required). Once in diesel operation, the motor winding of the UNIBLOCK machine can become a generator and the same diesel can supply the essential loads through an essential load output and the second winding. The ‘clean’ UPS and ‘dirty’ mechanical loads are kept isolated from each other by the two windings. On restoration of the mains, the output voltage is synchronised to the mains and the input breaker closes and the diesel is shut down.

Diesel UPS system specifications

Piller UNIBLOCK UBTD Diesel UPS Guide to Dimensions* & Weights - Single Output Range

Diesel UPS dimensions weights

Piller UNIBLOCK UBTD Diesel UPS Guide to Dimensions* & Weights - Dual Output Range

Diesel UPS dual output

*Note: Mains connection and energy storage modules are available in many configurations. Please consult us for details.
 

 

Diesel UPS system Operation

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Piller (UK) Ltd
91 Chesterton Lane
Cirencester
GL7 1YE

Tel: 01285 657721
Fax: 01285 654823
 

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