GRAHAM'S VLT® 6000 ADJUSTABLE FREQUENCY DRIVES INTERFACE WITH METASYS N2 COMMUNICATIONS PROTOCOL

Milwaukee, WI . . . . New literature from Danfoss Graham details their VLT® 6000 Series Adjustable Speed Drives for applications where Johnson Controls Metasys N2 communication protocol is used. The 6000 Series can be seamlessly installed as an N2 device requiring no integrator panel.

Whether new construction or retrofit, the VLT 6000 not only provides precise control of fan motors and pumps, but also monitors performance and sends data back to the systems during normal operation or when it is necessary to diagnose and correct faults.

Integration with Metasys N2 is a built-in feature of the VLT 6000. No boards, chips or additional software are required. A simple two-wire connection is all it takes to bring the VLT 6000 on-line.

Programming of the drive is possible, and as easy as using a keyboard, once the VLT 6000 and Metasys N2 systems are communicating. All Danfoss Graham drives arrive factory-programmed for the specific application for which they were selected, but customer adjustments may sometimes be desirable.

Danfoss Graham's unique built-in Proportional, Integral, Derivative (PID) controller allows Metasys system users the ability to include to set points and feedbacks into their drive and motor control loop. This PID control becomes a Metasys N2 controller, integrated into the system and without the need for additional sensors or controllers. This results in a less expensive, less complicated installation and smoother operation.

Danfoss Graham drives provide a run permissive feature that prevents operation of the drive and motor when critical system components are not in proper position for start-up. This will prevent operation when inappropriate start-ups could result in equipment damage.

All of the VLT 6000's features are accessible through the Metasys system. These features included low and high frequency warnings, low and high reference warnings, output ground faults, signal loss, no load/broken belts, missing phase, motor or drive over temperature, line under voltage or over voltage, DC bus under voltage and over voltage and output over current protection.

The drive automatically stops when speed drops below a pre-set "sleep" level for a specific time, until demand increases. The drive automatically synchronizes its output frequency with motor speed, regardless of direction of rotation.

The VLT 6000 provides trouble free, highly efficient operation, utilizing automatic switching frequency modulation, automatic energy optimization, automatic motor adaption, digital voltage vector control and auto ramping. All drives and panels are built to ISO 9001 quality standards. All drives and panels are UL, C-UL listed and CE marked.

Adjustable Frequency Drives Provide Energy Savings and Optimize Flow Control in Chill Water Pumping For Energy Savings

Milwaukee, WI . . . . The use of Danfoss Graham's broad line of adjustable frequency drives provides on-demand chill water pumping for energy savings. These savings can reach as much as 60% when AFDs are used to control a pump's motor speed rather than letting the pump run at a maximum constant speed.

These drives are designed to provide optimum flow in chill water pumping systems for maximum comfort without the need for throttling valves, or excess pumping, and are available in ratings through 600 HP and interface with computer or energy management systems.

Visit Graham's Web Site: www.grahamdrives.com. Graham's e-mail address is: graham@grahamdrives.com

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