Renovation of a municipal facility in Corinth, Texas. Working plans call for the renovation of a municipal facility.

**As of June 23, 2025, bids were rebid. No definite date for the rebid.** **As of June 17, 2025 this project has not yet been awarded. A timeline for award has not yet been established.** Lake Sharon VFD Replacement The City of Corinth reserves the right to reject any and all proposals and to waive defects in proposals. No officer or employee of the City of Corinth shall have a financial interest, direct or indirect, in this or any contract with the City of Corinth. Minority and small business vendors are encouraged to submit a proposal on any and all City of Corinth projects. Questions Deadline: Monday, May 5th, 2025 @ 10:00 AM CST The City of Corinth (City) is requesting proposals to remove and replace two (2) existing 400HP, 3 phase, 480 volt variable frequency drive (VFD) as described in the following bid specifications. The successful bidder shall execute a contract to furnish all equipment, materials, supplies, labor, permits, insurance and licenses as necessary to provide goods/services in accordance with the instructions, specifications, terms and conditions set forth in this bid. It is the intent of the City to select one provider for the aforementioned goods/services. The successful bidder will be considered the sole point of contact with regard to contractual matters, including payment of any and all charges resulting from the contract. The successful bidder will be awarded a one (1) year contract, effective from date of award or notice to proceed as determined by the City. One (1) VFD will be replaced and complete before September 15th, 2025. One (1) VFD will be replaced and complete after October 10th, 2025. Two purchase orders will be issued, one for each VFD Replacement. The purpose of this project is to remove two (2) existing Robicon 400 horsepower (HP), 3 phase (PH), 480-volt (V) Variable Frequency Drive (VFD) equipment, remote keypad, unnecessary wiring from existing cabinet and retrofit it with new VFD equipment, 480v feeder wiring, motor wiring from VFD to bypass cabinet to enhance the system's performance, energy efficiency, and reliability. The work includes decommissioning, removal, and providing the city with all wiring, equipment, as well as installation and commissioning of the new VFD systems. Removal of Existing Equipment: a. Decommissioning: Disconnect and de-energize existing VFDs and related electrical systems. b. Disconnection: Disconnect all electrical, mechanical, and communication connections. c. Removal: Safely remove the existing VFD units and any related components, such as power supplies, control panels, wiring, sensors, emergency bypass feeder & motor wiring and any other obsolete wiring or equipment. Retrofit with New VFD Equipment: A. New Equipment Specification: 1. Provide and install new VFD units, rated appropriately for the system's three phase, 480V variable drive for 400HP motor and 16" Cla Val 16-81-01 load requirements. Details provided in Appendix A. 2. Equipment should meet the latest standards for energy efficiency, safety, and operational flexibility. 3. The VFD equipment must be compatible with existing systems, automation/control and capable of integrating with any updated components. 4. VFD must be designed with a sine wave filter to run 400HP-414A @ 3/60/460 VAC motor. 5. VFD shall have approximately 3%-line impedance with a lightening/surge arrestor. 6. VFD shall be 12 pulse, voltage source inverter and shall be designed to drive squirrel cage induction motor. The VFD shall be suitable for normal duty, variable torque driving centrifugal pumps. Vector controls shall be sensor-less, linear and adjustable, and shall have self-tuning capability. Circuit boards shall be conformal coated. VFD shall be suitable for operation in ambient temperature (inside enclosure) of 50 degrees C (122 degrees F). Harmonic filter will be determined by manufacturer requirements and its inclusion in the package. B. Installation Specification: 1. Install new VFD & required equipment, including power wiring, control wiring, and necessary auxiliary systems (filters, fuses, breakers, etc.). 2. Install any structural support systems or mounting as needed. 3. Ensure proper alignment and integration of VFD units into existing infrastructure. 4. Replace 480v feeder & motor wiring from the VFD to the bypass cabinet for powering 400HP pump for automatic operation from the VFD, or in hand with the use of the bypass contactor in emergency situations. C. Electrical Work Specification: 1. Ensure all electrical connections, including power, control, and grounding systems, are installed in compliance with local electrical codes. D. Mechanical Work Specification: 1. Ensure that the mechanical systems (e.g., pumps, motors, fans) are integrated with the new VFDs and that all drives and load requirements are correctly matched. E Programming and Configuration Specification: 1. Program the new VFDs for optimal performance, taking into account system requirements such as speed control, torque, and load characteristics. 2. Configure and test communication protocols for integration with other automation or control systems.