6c Presentation Variable Frequency Drive
Item No. 6c_supp Meeting Date: September 25, 2018 Variable Frequency Drive Renewal and Replacement Project C800801 WP U0332 1 What is a Variable Frequency Drive (VFD) & what does it do A VFD is a type of motor controller that drives an electric motor by varying the frequency and voltage of its power supply. The primary purpose of a VFD is precise SPEED CONTROL so that motor speeds can be ramped up and ramped down thus using less energy by running the electric motor efficiently VFD Definition 2 What does a VFD look like In this picture a Variable Frequency Drive powering a Main Terminal Air Handling Unit fan running at 350 Horsepower 3 Where are these old VFDs VFDs are in multiple locations 4 The problem American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) recommends a VFD life span of 10-12 years. 131 VFDs have outlived their useful live and are considered obsolete by ASHRAE standards. This project was deferred in 2016 5 Scope of work solution Replace the 47 oldest Variable Frequency Drives with this project in order to avoid failures. Salvage components from these 47 VFDs and add those components to the Port's spare parts inventory. Extends the useful life of the 87 remaining obsolete VFDs 6 Project schedule Request Commission Authorization for Construction 3rd QTR 2018 Construction Starts 1st QTR 2019 In-Use Date 3rd QTR 2019 (1st group of VFDs) Due to complexity the construction duration is 18 months Construction durations 7 Project Budget Design: $1,175,000 Construction: $2,820,000 Total Project: $3,995,000 This request is for construction authorization and budget 8
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