Speed Variable Speed
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ABB drives - Technical guide No. 4, Guide to variable ...
library.e.abb.comIn each of the three drive system components, variable speed control is possible. Variable speed control can be accomplished, for example, using a frequency converter as the energy control component, a two speed motor as the motor component and gears as the transmission component. As mentioned earlier, most machines are driven by an electric motor.
Service Manual - Carrier
www.shareddocs.comThe variable speed circuit board is a serially communicating device that receives capacity demands from the Infinity wall control and communicates corresponding speed request to the Inverter Drive, which controls compressor to the speed demanded. The variable speed HP circuit board also controls the EXV to either
Service Manual - Carrier
www.shareddocs.comVariable Frequency Drive (VFD) The VFD converts single phase 60 Hz line power into a variable frequency, variable voltage, 3-phase output to drive the compressor at the speed requested by the control system. This function is performed by first converting the incoming line power to an intermediate high voltage DC supply.