The initial cost of VFDs in supermarket installations has decreased markedly. In the earliest days of drive applications, there were control difficulties, but with compressor and drive manufacturers working together, these problems have been solved.
The use of variable-frequency drives (VFDs) in supermarkets to control compressor and fan motors has become a key factor in reducing energy costs, enhancing product life and salability, and improving equipment service life. For outdoor condensers, drives utilizing variable-speed operation have made important contributions to noise abatement.
BENEFITS OF VARIABLE SPEED
In today's supermarkets, VFDs commonly are applied to regulate the operation of remote condenser fans and, to a lesser but growing extent, air-handler motors and HVAC fans.
In addition to providing constant load-matching capacity and saving energy by eliminating over-capacity running, variable-speed operation can result in substantial maintenance savings and enhanced compressor and fan-motor lifetimes. Variable speed also solves the noise-abatement problem for condenser fans.
It is important in specifying variable-speed installations to use inverter-rated motors. In retrofitting VFDs to existing installations, it likewise is important to work with a qualified vendor who can fit existing motors with appropriate filtering.
CONCLUSION
The initial cost of VFDs in supermarket installations has decreased markedly. In the earliest days of drive applications, there were control difficulties, but with compressor and drive manufacturers working together, these problems have been solved. Current drives are smaller and easier to program. New drives are easier to configure than earlier drives and can adapt automatically to the motors with which they are working. The number of configuration settings has been reduced by more than 50 percent.
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