The E7 ac drive is specifically designed for hvac applications, including air handlers, cooling towers, and pumps. It has built-in network communications for Johnson Controls Metasys N2 and Siemens APOGEE P1, with optional interfaces for other common hvac protocols. Features include: auto-restart, stall prevention, motor preheat, anti-windmilling dc injection braking, critical frequency rejection, momentary power loss ride-through, multidirectional speed search, no-load detection, two feedback capability, reverse disable, delay timer, run permissive, energy optimization, plenum mounting, and accel/decel time selection. Protective functions include UL508C motor overload, overheat, overcurrent, undercurrent, phase loss, and ground fault.

Yaskawa Electric America, attn: Ken Gniot, 16555 W. Ryerson Rd., New Berlin, WI 53151; 262-641-8243; 262-782-8737 (fax); www.drives.com (website).