Power Hubs

The PROFIBUS Power Hub is a modular, motherboard-based power supply system for four PROFIBUS PA segments. It consists of one or two motherboards and various plug-in modules. Optimized electrical symmetry and use of passive components to a large extent ensure best signal quality even under severe environmental conditions. For applications demanding highest reliability you can choose redundant configurations.

The low heat dissipation of the Power Hub results in high operating efficiency and allows a very long service life. The Power Hubs are designed to accommodate the revolutionary Advanced Diagnostics Module HD2-DM-A for online and real-time monitoring of the fieldbus physical layer.

The 500 mA Power Hub supplies up to 31 V and 500 mA. It is designed for best signal quality using CREST: Crosstalk and Resonance Suppression Technology. Filtering circuits always ensure optimal signal quality and the longest cable runs of any supply in the industry today.

The Compact PROFIBUS Power Hub puts up to 25 V and 360 mA on the cable. It transparently connects two PA-segments to PROFIBUS DP. The small size and configuration-free setup make this a very common choice for small fieldbus projects and even small system upgrades or test applications. The Compact Power Hub is permitted for installation in safe areas.

Implementing the High-Power Trunk Concept, Power Hub supplies 360 mA or 500 mA to the segment. Energy limitation for hazardous area protection is realized close to the field instruments through segment protectors and FieldBarriers for all hazardous areas up to Zone 1/Div 1. The Power Hub itself can be installed in Zone 2.

Motherboards are base units of the FieldConnex® Power Hub system. They are installed on a DIN-Rail. All connections in the cabinet are through the motherboard allowing for simple installation: fieldbus segment, bulk power supply, DCS, self supervision and diagnostic alarm contact. Terminals are plug-in type and feature retaining screws for high reliability and durability.

The motherboards hold all plug-in modules of the Power Hub system. The modules can be exchanged without tools and while the system is in operation. In redundant configuration this exchange will be bumpless. All electronics are passive giving the motherboards a long-lasting service life.

Power Modules feed up to 500 mA current per segment. Simple design and passive impedance generation contribute to industry leading high availability. They are available in two versions:

• Power supply module with galvanic isolation and a choice of controlled output voltages for topologies in safe areas and for explosion protection methods according to FISCO and FNICO.
• Power conditioner modules feature conditions the existing bulk power. The voltage is not controlled. The conditioner features current limitation and lowest heat dissipation without galvanic isolation.

The Basic Diagnostic Module communicates status information of the Power Hub via dry alarm contact. It supervises primary and secondary bulk power, internal faults, and incompatible power modules in redundant configuration.