MINNEAPOLIS – Beckhoff Automation has announced the new KL2791 Bus Terminal for single-phase AC motor speed control. The KL2791 Bus Terminal enables direct connection of small, 1 A, single-phase motors rated 120 V, 60 Hz.

By using the KL2791 terminal, the energy use of capacitor, universal and shaded-pole motors can be greatly reduced. This technique is particularly suitable for drives with quadratic load characteristics such as fans and pumps. The speed controller is extremely compact and is in a standard Bus Terminal housing with a width of just 12 mm. The KL2791 Bus Terminal can be used in any of the numerous fieldbus networks supported by the Beckhoff Bus Terminal system.

The set value for the motor speed is specified by a 16-bit value. Using the KL2791, the motor is switched on and off with a practice-proven mains synchronous pattern, so that the motor consumes less power and the speed decreases 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 to 100 percent.

www.beckhoff.com

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