3-phase supplies ensure maximum system availability

5th November 2015
Barney Scott

Murrelektronik's Emparro family has a new member. The recently developed Emparro 3-phase power supplies for 24V applications are important components in quality power management systems. These units are not only extremely reliable but also extraordinarily efficient as a result of their integrated reserved power. However, they don't require much space in the cabinet.

Reliable power supplies are an essential component to ensure maximum availability of machines and systems. Therefore, reliability was a high priority during development of these 3-phase units. Their high MTBF value of about 1m hours shows this clearly. Achieving this MTBF is possible because of Murr's high-quality components, a modern, slim circuit board design and processor-controlled electronics. An integrated gas discharge valve protects the power supply from interfering pulses up to 6kV. Therefore, overvoltage coming from the mains, EMC interference (as caused by frequency converters) or contact bounces cannot cause any damage.

The up to 95% efficiency rating is another reason the Emparro 3-phase unit has such a long life span. The resulting power loss is very low which exposes the components to less thermal stress. The Emparro 3-phase efficiency rating is the same whether it is operating at full power or at any point along the load range including when it is operating at low capacity. This is an important benefit especially when compared to other power supplies.

Emparro 3-phase power supply units have a special feature: they have reserved power integrated. They are designed in such a way that they can be operated with up to 20% overload in ambient temperatures of up to 45°C. The 5A models continuously supply 6A, 10A models 12A and 20A units 24A.

This offers two essential benefits. The first is that if additional loads have to be connected to a machine or a system, Emparro 3-phase offers the necessary reserve. The second is if the demand is close to the maximum of a power supply a larger power supply does not have to be used. Instead, the reserve can be used to meet the demand thus saving cabinet space and money that would have been spent on a larger power supply.

Emparro 3-phase also features 2 different boost functions: power boost and hyper boost. The Power Boost supplies 50% more power for up to 5 seconds while the Hyper Boost provides up to 400% more power for up to 20ms.

Emparro 3-phase power supplies are very compact: the 20A model fits in a 65mm wide housing. When compared to similar power supplies, this saves a lot of space in the cabinet. The vibration resistant push-in terminals make installation tool free so connection maintenance becomes a thing of the past. While the integrated fuses help to reduce planning and wiring efforts.

“Expensive downtime caused by defective power supplies is something to be avoided. This is why technicians take care to select durable, long lasting components.  With Emparro 3-phase, we have developed a power supply that meets all aspects of their needs.” said Manuel Senk, Product Manager, Murr.

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