ABB Inc.: HVAC Bypass
The E-Clipse bypass communicates directly with building automation systems (BAS), keeping facility managers in control of every HVAC requirement, even in conditions where electrical challenges may trip out the drives. It is available in a UL Type 1, UL Type 12, or NEMA 3R enclosure, and integrated with the ACH DriveIT low-voltage 550 adjustable-speed ac drives. The two-contactor bypass features both a service switch that disconnects the drive for service, and a main disconnect switch or circuit breaker. The dual switch eliminates downtime, since the motor/load never needs to go offline; this backup feature ensures uninterrupted operation. Included in every bypass are Modbus RTU, Johnson Controls N2, Siemens FLN, and BACnet communications protocols. Other protocols, such as LonWorks, Profibus-DP, Ethernet/IP, Modbus TCP, DeviceNet, and CANopen, are available as plug-in option cards. Over 45 individual points of data are communicated between the bypass and the BAS system master controller. In addition, the operator can start and stop the bypass over serial communications or force the system into override mode.
ABB Inc., 16250 West Glendale Dr., New Berlin, WI 53151; 262-785-3200; www.abb.us/drives