AC Motor Controllers and Drives
AC Drives feature bypass and electronic control.
Press Release Summary:
Designed for HVAC building automation applications that require redundancy, E7L drive employs 2-contactor bypass to allow motor operation from drive or across ac line. It features electronic touchpad control, PI controller, and embedded communications. AC Drive adjusts output voltage to suit actual motor load. Version E7B provides 3-contactor bypass that uses additional contactor to isolate drive from line power for servicing while bypass is operating.
Original Press Release:
Yaskawa AC Drives with Bypass and Electronic Control Reduce Equipment Cost
NEW BERLIN, WIS - Yaskawa Electric America, Inc., has introduced the E7L drive with bypass and touchpad control specifically for HVAC building automation applications that require the redundant operation provided by bypass, but which can defer service until shutdown is convenient.
The E7L system is a 2-contactor bypass that allows motor operation from either the drive or directly across the AC line. The motor is transferred from the drive to the AC line via a drive contactor and a bypass contactor. The Yaskawa E7B system is a 3-contactor bypass which includes an additional contactor to isolate the drive from line power for servicing while the bypass is operating.
The Electronic Touchpad Control of the E7L system includes printed circuit-mounted operator control functions and LCD keypad for drive control. The benefits are lower cost and increased reliability compared to hand-wired components. LED illuminated selector buttons are provided for Hand, Off, Auto, Drive Select, Bypass Select, Drive Test; and 11 LED status indicators keep users apprised of system operation.
The E7L system includes inputs for safety interlocks, auto run/stop, damper/BAS interlock, remote transfer to bypass, and smoke purge. The E7L also provides 0-10 VDC or 4-20 mA input speed signals and an RS485 communication port.
The AC Drive in the E7L system adjusts output voltage to suit actual motor load, which increases motor efficiency by several percent. Other energy features include the enhanced sleep function and built-in kW-hour and kW display. The E7L system will alert users to conditions such as loss of load or broken belts.
The E7L system has built in PI controller to maintain the set point for control of fans and pumps for pressure, flow, or temperature regulation.
Communications are embedded for the popular building automation protocols Johnson Controls Metasys® N2, Siemens Apogee(TM) FLN and Modbus. A LonWorks® interface card is optional. With DriveWizard(TM) software, users have the ability to manage the AC drive via a PC, to upload, download, monitor and graph drive parameters.
The standard enclosure for the E7L drive is NEMA 1. NEMA12 FVFF is an option.
Yaskawa is the world's largest producer of AC drives and the only drive manufacturer to receive the prestigious Deming Prize for quality. Yaskawa Electric America operates from offices and manufacturing facilities in New Berlin, Wisconsin; Waukegan, Illinois; Buffalo Grove, Illinois; and other locations throughout the Americas. For further information, visit the Yaskawa web site at www.yaskawa.com, or contact the company at 16555 West Ryerson Road, New Berlin, WI 53151. Phone: 800-YASKAWA (927-5292) Fax: (847) 887-7310.
For more information on Yaskawa's E7L Drive/Bypass System, visit:
yaskawa.com/site/products.nsf/products/Commercial HVAC Drives~e7l.html
