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Direct connection of single-phase AC motors of
up to 100W are enabled by the KL2791 Bus Terminal. In this way, the speed of capacitor,universal and shaded-pole motors can be reduced. This technique is suitable for drives with quadratic load characteristic such as fans and pumps. The speed controller is compact and housed in a standard bus terminal (12mm wide). In many industrial nations, electric motors accountfor more than half of the electricity consumption. The speed controller offers energy saving, a decrease in speed as well as a reduction innoise 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. Theset value for the motor speed is specified by a 16-bit value. The motor is switched on and off with a 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 % to 100 %.
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