A ladder logic software program designed to run on commercially available programmable logic controller platforms for the specific purpose of controlling the inlet guide vanes and by-pass valves of a centrifugal air compressor with a control algorithm with the intention of improving turndown capacity of the throttle range

'air':34 'algorithm':39 'avail':11 'by-pass':27 'capac':46 'centrifug':33 'commerci':10 'compressor':35 'control':14,21,38 'design':6 'guid':24 'improv':44 'inlet':23 'intent':42 'ladder':2 'logic':3,13 'pass':29 'platform':15 'program':5 'programm':12 'purpos':19 'rang':50 'run':8 'softwar':4 'specif':18 'throttl':49 'turndown':45 'valv':30 'vane':25

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