Side-By-Side Electronic Bypass/Drive ABB has improved its electronic bypass for the ACH 400 drive, the company says. Built-in enhancements to the side-by-side electronic bypass/drive include run-permissive circuitry. According to the manufacturer, with a start command of any kind, the bypass/drive will signal the damper to open and wait until it receives status confirmation before allowing motor operation. Two modes of fireman’s override circuits make it possible to shift the motor to bypass operation for smoke purge, and/or override both keypad and building automation commands to ensure local drive/motor operation.
Contact Jeff Miller, ABB Inc., Automation Technology Products Division, Drives & Power Electronics, 16250 W. Glendale Drive, New Berlin, WI 53151-2840; 262-780-3865; 262-785-8501 (fax); jeff.miller@us.abb.com; www.abb.com/motors&drives.