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Weidmuller FieldPower PowerBox 10P SNT

03 June 2010

Decentralised 24VDC network with FieldPower power supply unit PowerBox 10P SNT and engineering tool NetCalc. Vibration proof power supply unit, protection class IP65, with integrated energy bus. Decentralised power supply unit for efficient, highly available DC networks. Load balance in case of multiple supply.


With the PowerBox 10P SNT of the FieldPower® family, Weidmuller presents a vibration-proof power supply unit with integrated energy bus, protection class IP65, for the realisation of highly available decentralised 24VDC networks. In combination with the project planning tool NetCalc, state of tension, power operation grade, as well as short circuit currents in one and three phase AC or DC nets can interactively be projected, calculated and realised in a "copper-optimised" way. The performance of "NetCalc" will be upgraded according to the requirements of customers and applications. The "PowerBox 10P SNT" with three-phase supply can be used worldwide, due to its UL-approval (pending) – even in North American networks without N-conductor. This innovative concept for the realisation of highly available 24VDC networks in combination with the calculation and optimisation software "NetCalc" will be presented and offered by Weidmüller for the first time at the SPS/IPC/Drives Fair 2009.

The power supply unit "PowerBox 10PSNT" for decentralised installation is mounted directly in the field, adapted to the 400/480 V energy bus. The 24 VDC distribution is effected in parallel to the 400/480 V energy bus. Several supplying power units in parallel allow a constant current level, even with reduced conductor cross-sections in the DC network. The power supply unit of the FieldPower® family has been designed for load balancing in case of multiple supply. It is suitable for use with an energy bus: this means that the starting current is limited – therefore an upstream group protection device is not triggered unintentionally. The "PowerBox 10P SNT" allows to set up highly available DC networks that, for instance, tolerate the failure of one phase on the primary side. The power supplies have been equipped with an overload alarm – that will, via switch contact, send a signal to a superordinate control unit in case of overload (remote message). The operator can thus purposefully disconnect, or keep essential devices "alive", before the complete system fails. Decentralised networks based on the "PowerBox 10P SNT" are thus characterised by their high availability and safety, because all power supplies of a network support each other (load sharing). Decentralised 24V DC networks with FieldPower® components allow the use of cross-sections up to 2 x 6 mm². These DC networks stand out for their small voltage drop, low assembly costs, little planning work, high flexibility, simple cabling and small cable channels. They show their special capacities in longsome machines and plants, especially when there are 24V DC devices in the field, requiring more power, such as remote I/Os, motor starters and 24V DC roller drives. Automotive engineering and conveyor systems for various industries are typical sectors having these requirements.

The project planning tool "NetCalc" supports the application of FieldPower® and "PowerBox 10P SNT" power supplies as well as the project planning of AC and DC networks with different structures (line, tree). "NetCalc" allows interactive planning and calculation of the state of tension, power operating grade, short circuit currents and the dimensioning of safety devices in AC and DC networks. Furthermore, the software supports documentation of the planned low voltage systems and low voltage distribution systems.

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