Staying power

A roundup of new power supplies and associated devices for industrial machine applications shows how the trend toward distributed control systems and competition among vendors gives OEMs more choices.

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Rick PedrazaBy Rick Pedraza, Managing Editor, Digital Media

This roundup of power supplies and associated devices for industrial machine applications indicates the trend toward distributed control systems is the continuing development in newer products. While the use of distributed I/O is increasing for industrial machine control, the technology of supplying remote device power to machine controls has lagged a little behind the technology curve, according to some in the industry.

Along that curve, several companies have introduced new devices that provide field power in networked applications that have no need for a control panel. As field-level control systems migrate toward low-voltage-DC-driven systems, and as the number of active devices in control panels increase, the demand for more powerful, compact and efficient power supplies is being addressed.

Among more traditional configurations, DIN-rail mounted devices continue to grow in acceptance, and the number of competitors offering these devices is staggering, according to Mike Johnson, director of marketing for Sola/Hevi-Duty. “It’s definitely an over-penetrated market,” he says, “which is not so good for us manufacturers, but a boon to users since it has driven the prices down sharply. This has led to even higher adoption rates for DIN-rail units.”

The sharp increase in competition also started a bit of an innovation war among suppliers to add new features and create smaller and more efficient units. These new features include fault-tolerant/redundant systems, and power supplies with built-in battery back-up.

Several companies introduced new power supplies to deliver added benefits for control applications by including enhancements such as adjustable voltage settings for each unit, the addition of LED status indicators, and making the unit DIN-rail mountable. Several new models received regulatory approvals and certification to international standards for devices intended for use in potentially explosive atmospheres.

Other trends in the power supplies industry include the development of double conversion, on-line uninterruptible power supplies; power supplies designed for a wide range of wireless, datacom, and industrial applications; and Foundation fieldbus power supplies that allows users to enjoy the same benefits in terms of power, cable length and number of devices per segment in hazardous locations as they do in general purpose applications.

Power supplies that meet AS-Interface specification version 2.1 also are represented in the roundup below. “With the addition of these products, implementers of the AS-Interface network now can install a reliable and industrially hardened power supply quickly,” said Jim Bachle, product manager for Wago Corp.

Product Roundup:

Industrial Power Supplies

Tough Standards
LZSa500-3 power supply has a nominal 24-V output, adjustable from 18-29.4 V for non-standard system voltages. It provides a full load 21-A output current from -40 to 60 °C, de-rating linearly to 60% load at 71° C ambient. Features include remote on/off, remote resistance or voltage programming, user-adjustable, over-voltage protection, DC good, inverter fail, current-share, and a 200 kHz synchronization signal. Lambda; 800/lambda4;

A Lot of Input
IEXR and IEHR 70-150 W DC/DC converters have input ranges of 10-16 VDC, 21-60 VDC or 60-132 VDC. Each has full galvanic isolation, fused input protection, output protection for either short-circuit or overload conditions, reverse polarity protection, and input transient protection. All are regulated to less than 0.5% line and less than 0.7% load. Efficiencies are greater than 80% and ripple typically is 1% peak-to-peak. All can be configured for optional N+1 parallel redundancy operation. Schaefer; 508/881-7330;

Uninterruptible Power
1609-P uninterruptible power supply protects against fluctuating power or complete losses by providing increased voltage and frequency regulation, internal bypass, and input power factor correction. Users can remotely monitor and configure the devices. Features include an external battery pack for added power, or to make a live switch without disrupting the system. Available in power ranges from 3-10 kVA, and in 208 and 230 V applications. Rockwell Automation; 414/382-2000;

Hit Switcher
VPU-S200 switching power supply yields 200 W and can be used for wireless, datacom, and industrial applications. It accepts a universal input voltage (85-264 VAC or 120-340 VDC) and offers efficiencies to 81%. Units are rated for operation at 100% load from 0-50 °C ambient with 18 cfm of forced-air cooling. Features include RoHS compliance, active power-factor correction, remote on/off, short-circuit protection, over-current protection, and over-voltage protection. V-Infinity; 503/612-2332;

Single-Segment Power
KLD2-FBPS-1.25.360 Foundation fieldbus power supply provides 25 V and 360 mA with minimal heat dissipation, while supporting redundant 24-V power. Galvanically isolated modules can mount adjacent to one another without concern for spacing. Passive power conditioning provides reliability for single-segment power needs. It supports high-power-trunk protection for hazardous locations, and simple connection of the mobile advanced diagnostic module for physical layer diagnostics. Pepperl+Fuchs; 330/486-0002;

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