Bus terminal saves energy

Beckhoff has expanded its bus terminal I/O system. The new KL2791 bus terminal enables direct connection of single-phase AC motors up to 100 W. In this way the speed of capacitor, universal and shaded-pole motors can be reduced. This technique is particularly suitable for drives with quadratic load characteristic such as fans and pumps. The speed controller is extremely compact and housed in a standard bus terminal with a width of 12 mm. Besides saving energy, a decrease in speed also offers a reduction in noise and an increase in the service life of the motor. It can be used in any bus system supported by the Beckhoff bus terminal system. The set value for the motor speed is specified by a 16-bit value. The motor is switched on and off with a practice-proven mains-synchronous pattern, so that the motor consumes less power and the speed falls significantly. This method is well suited to motors with fixed loads, such as pumps and fans, in order to achieve a setting range for the flow rate from 10 per cent to 100 per cent.