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Emerald Group Publishing Limited
Copyright © 1998, MCB UP Limited
New microdrive from ABB
New microdrive from ABB
Keywords Automation, Microdrive
A variable speed AC microdrive with the functions and communication facilities comparable to larger drives has been launched by ABB (Plate 4).
Covering 0.37kW to 2.2kW, 200V to 480V, in single- and three-phase, the ACS 140 offers Modbus, serial communications, two relay outputs and two analogue inputs. Features include built-in PID control, flying start on a spinning load, seven application macros for fast programming and configuration and dynamic braking for accurate stopping.
Owing to its high repeatability, the ACS 140 improves end-product quality and output by controlling processes within narrow tolerances, says ABB. The inaccuracy in the microdrive's analogue input is less than 1 per cent, giving accurate speed control and consistent performance.
For accurate process control, the microdrive responds in nine milliseconds to input signals. There is little delay between the drive receiving an instruction and the motor shaft speed being adjusted. On cutting machines, for example, this precise control ensures the blade is in the correct position at the correct time and so reduces waste caused by inaccurate cutting of the metal or wood.
Mounting the ACS 140 can be in one of three ways: flange, panel or DIN rail. Flange mounting allows the drive to be installed with the heat sink outside the panel or machine. This enables more units to be packed into a smaller space and increases the reliability of the drive electronics by separating them from the heat generated.
Plate 4 Variable speed AC microdrive
Both single- and three-phase models, across all power ratings, are only 80mm wide, giving the ACS 140 one of the smallest footprints on the market.
No control panel is needed, as many parameters are preset. For complex applications that need many parameters to be set, a small control panel is available which clips on to the front of the microdrive. Set-up times are cut for users of several ACS 140 units with the panel's parameter copy and paste facility.
For further information contact: David V. Sheldon, ABB Industry (Pty) Ltd, PO Box 11494, 1457 Randhart, South Africa. Tel: +27 11 567 5340; Fax: +27 11 9080 2061; http://www.abb.com/vsd