HVAC Drive provides integrated damper control.

Press Release Summary:

Side-by-Side electronic bypass/drive fits into air-handling units and pumping packages, making it suitable for single-motor HVAC fan and pump applications. Bypass/drive signals damper to open and waits until it receives confirmation that damper is fully open, before allowing motor operation. Drive is available in plenum-rated NEMA 1 or NEMA 12 enclosure. Windows(R) tool facilitates set-up, commissioning, and maintenance of drive and bypass.

Original Press Release:

ABB Packs Additional Features Into One Of The Industry's Most Compact Side-By-Side Electronic Bypass/Drives

Damper Control Added To Microprocessor-based Bypass/Drive; Offered In A Plenum-Rated Model, the Bypass Is Fully Integrated With New ACH 400 Drive

NEW BERLIN, Wis., January 2002 - ABB continues to add features into the company's new Side-by-Side Electronic Bypass/Drive -- ideal for fitting into air-handling units and pumping packages. Available in a Plenum-rated NEMA 1 or NEMA 12 enclosure, "the two-contactor bypass features both a service switch that disconnects the drive for service, and a main disconnect switch or circuit breaker," said Jeff Miller, HVAC sales manager for ABB Automation Technology Products Division, Drives & Power Electronics.

Ideal for operating single-motor HVAC fan and pump applications, the side-by-side Bypass/Drive unit is wall mounted, providing easy access and serviceability to users.

ABB's new electronic bypass is fully integrated with the company's ACH 400 adjustable-speed AC drive, to form a single unit that features an extremely compact design "tailor-made to fit easily into all types of OEM equipment used in the HVAC industry," Miller noted.

ABB is the largest motor drives manufacturer in the world and the #1 drives supplier to the U.S. HVAC industry, with more than 25 percent of the market. The company has connected thousands of drives to building automations systems such as Johnson Controls Metasys, Siemens Building Automation- Landis Division FLN, Modbus, Lon Works, and others.

First Of Their Kind
ABB has designed first of their kind features into both the bypass and drive. "The bypass is revolutionary, because the unit automatically protects the motor from input phase-loss conditions in both the drive and bypass modes," said Miller. "And the ACH 400 is the industry's only drive with the built-in capability of controlling digital and analog outputs, and monitoring all digital and analog inputs over the serial link. It can monitor whether the motor is in drive or bypass mode, and the serial link can even force bypass mode. These are breakthroughs in bypass and drive technology."

The system also now can control dampers, Miller noted. With a start command of any kind, the bypass/drive will signal the damper to open - and wait until it receives confirmation that the damper is fully open, before allowing motor operation. Additionally, the system now includes two modes of fireman's override.

Developed at ABB's New Berlin, Wisconsin, Research Center, the Side-By-Side unit adds, as standard, the service switch, which disconnects the drive for service, while the motor runs in bypass. "This benefit virtually eliminates all downtime," noted Miller. "The motor/load never needs to go off line." HVAC managers like the comfort of having a bypass available to them as a back-up feature, he said, "which is why over one-half of all drives sold for commercial applications feature a bypass."

The new bypass/drive is being produced at ABB's Global Factory in New Berlin, a modular assembly facility that requires less than an hour for manufacturing such units. "It enables us to be extremely responsive to the market generally and customers, specifically," said Chuck Clark, president of ABB Drives & Power Electronics.

Integrated Bypass Design
Among other design refinements, the bypass offers: voltage tolerance of ± 30%, without contactor dropout or coil failure; input power single-phase protection in both drive and bypass modes; easy-to-use membrane keypad for bypass operation and status display; fault-reset button for the selectable Class 20 or Class 30 electronic overload; multiple inputs and relay outputs; and selectable manual or automatic transfer from drive to bypass.

"There is less wiring and fewer parts in this bypass/drive, which increases reliability and creates a smaller unit profile," said Miller. "The bypass and ACH 400 drive combine to create one of the industry's most compact, complete design," he noted.

Drive Window(TM) Lite Tool
ABB's Windows-based Drive Window(TM) Lite Tool makes set-up, commissioning and maintenance of the drive and bypass easy. Connected via a laptop or desktop PC, the tool also provides access to all ABB drives on a Direct Digital Control System (DDCS) network. Easy-operating features of the tool include system configuration, operator panel displayed on screen, parameter upload/download and back-up control, drive monitoring/trending, and data and event logging.

All models in the ACH 400 drive series also can be connected to common fieldbus networks, including Johnson Controls, Siemens-Landis Division, Modbus, LonWorks, and others.

The drive meets worldwide standards, and carries UL®, cUL®, and CE approvals.

ABB Inc., the global technology company, is the # 1 drives supplier to the U.S. HVAC market, and has connected more than 20,000 drives to building automation systems. In the USA, ABB Inc., Automation Technology Products Division, Drives & Power Electronics, New Berlin, Wisconsin, supplies a complete line of energy-efficient electric drives and motors to HVAC and commercial customers through an integrated channel of sales representatives and distributors. Products manufactured include AC & DC variable speed drives from fractional to 400 horsepower. HVAC single-motor drive applications include exhaust fans, fume hoods, re-circulation pumps, condenser fans; multiple-motor applications include multi-cell cooling towers, paralleled chilled water, and booster pump systems (http://www.abb-drives.com/).

ABB (http://www.abb.com) is a global leader in power and automation technologies that enable utility and industry customers to improve their performance while lowering their environmental impact. ABB has 160,000 employees in more than 100 countries. The company's U.S. operations employ more than 15,000 people at manufacturing and other facilities in 40 states.

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