Variable-speed options are abundant in HVAC and their impact has been felt industry-wide. Contractors and manufacturers alike have taken to these single- and two-stage alternatives as ways to enhance ...

Utility power plant generators are usually designed for a power factor (PF) of .8 to .9. If demand-side PF is lower than the designed PF, the generator current will rise above the equipment's rated ...

QUESTION: I’ve been told that some technicians don’t like variable speed air conditioners due to their high maintenance costs. Is that true? ANSWER: A variable speed AC runs at a lower speed for ...

Variable speed drives (VSDs), sometimes also known as variable frequency drives, are electronic devices used to regulate the speed of an ac induction motor. Electric motors consume approximately 25% ...

The SMVector drive has an input voltage range from 120-Vac, 1-phase to 600-Vac, 3-phase and has four modes of operation: V/Hz, enhanced V/Hz, vector speed, and torque. It has a power range up to 25 hp ...

Global demand for both energy and water conservation is having a tremendous impact on the home appliance market. The regulatory standards and recommendations are redefining a new generation of energy- ...

Single- and three-phase alternating current (AC) motor speed can be controlled by controlling the frequency of the voltage coming to it. Motor speed has a lot to do with the capacity of refrigeration ...