Eugene/Springfield Water Pollution Control Facility 1984-1991

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,' .C Page 62 Section I: T$c~uvicnt. SBRVtCBS action (direct/reverse),conttolalgorithm (PID/ P/PI), signal conditioning (E/I, I/E, P/I, IJP), or special processing (square root extractions, etc. ) During the first phase, it also was necessary to verify routing and integrity of all plant wiring because of the many changes and additions to the plantsince the as-builtdrawings were submittedby the original contrac tor. O nce wiring diagrams were developed, they were transferred to AUTOCAD to facilitate future updates and revisions. To help locate wire or cable in the future, staff also put shrink-type prefabricated labels on most of the plan's wiring and cabling. To do this, they pur- chased a TMS computerized wire labeling system that enabled staff to develop a wire list data base and print permanent labels. • Preliminary Construction During preliminary construction, equipmenC was installed and wire was strung when possible before the system arrived. Accomplishments during this phase included: determining routing and installa- tion of the main data highway cabling; designing and building the interface cabinet to allow a quick wiring change over to the DCS; routing and in- stallingmuch of the conduit and cable tray required for the DCS installation; preparing the 110 VAC powerrequired for the DCS installation; preparing locations to place the DCS equipment for installation (i.e., removal of ob- structions, rerouting of conduit, etc. ); and installing most of the DCS opera- torwork stations. • System Configuration For the most part, system configura- tion occurred concurrently with pre- liminary construction. Tasks accom- plishedbythe plant's instrument tech- nicians in this phase included: devel- oping anew loop and ID number sys- tem and entering all new tag and loop ID's into the DCS database; establish- ing actual input/output points on the DCS; creating control actions to du- plicate existing control; developing sequence tables to replace the existing PLC logic; and entering configuration data into the DCS data base. EQUIPMENT INSTALLATION This phase involved installing, wiring, and com- missioning the actual DCS equipment and in- cluded installing DCS field control unit cabinets into the plant process areas, final installation and changeover of all wiring, testing of inputs and outputs, testing of control actions, and bringing control loops on-line. • Auxiliary System Integration This phase involved integrating the various inter- faces from auxiliary systems -including the MicroVAXhistoricaldatattansfer, Motorola Intrac 2000 Telemetry System, and the Willakenzie Re- mote I/o interface -into the DCS. • Graphic Design The Operations section designed the graphics to give a pictorial view of process areas and equip- ment details and to signal changes in conditions, including a display of all input points and alarm conditions. The section also was responsible for generating operator-guided messages, soft key as- signments, real and historic time trending, and operator training. An operations supervisor reviews graphic displays of plant operations.