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<br />City of Arden Hills, MN – 25X.137753 LIFT STATION CONTROL SYSTEM <br />January 2026 PAGE 26 90 04-8 <br />©2026 Design Tree Engineering, Inc All Rights Reserved <br />c. Communication/Telemetery Alarm <br />d. High Water Level Alarm <br />e. Pump 1 Fail <br />f. SPD <br />g. Seal Fail <br />h. Pump Running <br />i. Pump Run Times <br />j. Spare <br />k. Spare <br />9. Refer to Owner’s control system programmer for operational description of alarming procedures <br />and notifications. <br />N. General Requirements <br />1. Restart After Power Failure: <br />a. After a power failure, the control system shall automatically restart equipment in a timed <br />sequence. <br />2. The control system shall be fully operational in manual modes. <br />3. Run times, analytical instruments, levels, flows, equipment run/fail indication, etc. shall be <br />monitored/accumulated/displayed. <br />4. All variables, such as starting sequence, on/off/alarm set points, time delays, etc., shall be operator <br />adjustable via the control system interfaces. <br /> ALTERNATE 3 LIFT STATION CONTROL DESCRITION <br />A. Provide an outdoor control panel at the lift station site to control the operation of the submersible <br />pump. Provide an Omnisite remote monitoring system to monitor and trend a submersible level <br />transducer for pond level, monitor a motor fail alarm, and high water level alarm. Add an Allen-Bradley <br />PLC with Panelview Plus 7 OIT for pump controls using the submersible level transducer with back-up <br />float controls to replace the basic relay logic control. <br />B. A Hand-Off-Auto control mode selector switch is to be provided on the control panel door for the <br />pump. <br />C. Hand: the associated pump shall run regardless of if the control system is operational. Alarms, except <br />motor overload or any other alarm that would void the pump manufacturer’s warranty, shall not shut <br />the pump down. VFD shall operate at a speed preset at the VFD. <br />D. Off: the associated pump shall not be called to run. <br />1. Auto: the control panel shall run the pump dependent on the liquid level of the wet well. <br />E. AUTO (PLC) control mode: <br />1. The control panel pump control shall operate the pump based on the liquid level in the wet well. <br />2. On a rising level, the pump shall be started, pump shall be stopped at low level. A submersible level <br />transducer shall provide normal control. <br />3. Speed control and pump starting/stopping shall be as follows: <br />a. Process Engineer will direct programmer on desired speed (VFD HZ) for each of the following <br />setpoints.