19-230 - ZONE 3/4 PUMP STATION MCC REPLACEMENT AND VFD INSTALL

The scope of this Professional Service Agreement includes developing the design and specifications for the replacement of two (2) motor control center (MCC) switchboards and the installation of two (2) new variable frequency drives (VFDs) at the Zone 3/4 Pump Station (Project). The Project is located north of the Thornton Arts and Culture Center off Dorothy Boulevard at 9520 Ellen Court. The MCCs to be replaced include the existing north Square D MCC and the existing south Cutler Hammer MCC. New VFDs will be installed on pumps 3-2 and 3-3 at the pump station, which do not currently have VFDs. A Power System Analysis (arc flash study) was completed by Schneider Electric in 2016 and revised in 2018 for the Project. These studies should be used as a guide for the upgrades and replacements specified herein. The Power Systems Analysis is included as an attachment to this Professional Service Agreement. It should be noted that the north automatic transfer switch (ATS) and the south ATS were both replaced in December 2016 and December 2017, respectively.