Ac Motor Drive Range

BALDOR has extended its AC motor drives for adjustable speed applications - with new higher power options, washdown-duty variants, and more plug-in expansion cards. Highlights include 26 new AC motor drives that extend the upper power rating from 45 to 93 kW, a further selection of drives available in washdown-duty enclosures, an d a programmable pulse-follower board that allows users to link drives in sophisticated ways - including electronic gearing. This results from a high-integrity design strategy, which includes FMEA [failure mode and effect analysis], built-in protection modes to guard against misuse, and a manufacturing process embracing stress testing and full-load testing of final products. With over a year of sales history for the lower power options, this careful design approach has resulted in a repair returns level of less than 0.3 percent an exceptional figure for this area of power electronics - providing valuable support for automation users with critical or continuous processes. H2 rives are available in open or closed loop variants, supporting inverter, encoderless vector and closed-loop vector modes of motor control. There is also a range of drives for servo motor control applications up to 18.5 kW. The closed-loop variant features a fourth-generation space- vector control algorithm for fast and steady motor control as temperature and loading con- ditions fluctuate. This sheer choice of speed control, combined with a modular expansion bus and option range, provides optimised solutions to all adjustable speed motor drive applications, from simple speed control to advanced positioning and sophisticated movements. Positioning software is included with the new drives. This supports 15 different profiles as Standard, including point-to-point moves, without installing any additional hardware. The drives all feature an expansion bus that accepts plugin functions including communications facilities or digital and analogue I/O cards. This allows users to configure systems for specific applications at minimal cost. Among the fieldbus net- working communications options are DeviceNet and Profibus-DP, with Modbus as standard, and Ethernet TCP/IP networking. The latter option can function as an HTTP web server, allowing remote monitoring of status using a standard web browser. The latest members of the H2 family extend the power ratings available from 45 to 93 kW, opening up applications in a number of heavier-duty machinery areas such as extruders or punch presses. Baldor is also adding a choice of units up to 7.5 kW power ratings in washdown duty enclosures, for clean area applications such as food and pharmaceutical processing. Inverter, encoderless vector and closed-loop vector models are available for single- and three-phase inputs of 230, 460 or 575 VAC.