Attachment 2: Statement of Work

USDA ARS Cotton Ginning Research Unit
Statement of Work

Micro Gin Controls with Programmable Logic Controllers (PLC) and Human Machine Interface (HMI) General Information (A):
A1:
The USDA ARS Cotton Ginning Research Unit in Stoneville, MS is requesting turn-key submissions for design, supply, and installation of one Gin Control Console equipped with PLC and HMI to replace existing hardwired devices and controls. Commissioning will be the joint responsibility of contractor and USDA personnel.
A2:
Existing service is provided by three on site transformers providing 480 volts via a delta configuration with a corner grounded “B” phase. The current service configuration will not change. Special consideration need be applied to application of variable frequency drives with the grounded “B” phase.
A3:
Supply must include all devices and controls, wiring, connectors, and any additional conduit/cable tray to convert existing 480-volt starters to 24-volt DC or 120-volt AC coils. All wiring and hardware must meet applicable local and national codes. Contractor must utilize existing 600-amp service panel on wall at East end of building 26.
A4:
Due to the complexity and age of the existing configuration, it is strongly recommended that a contractor’s representative make at the minimum one site visit prior to bidding for the contract. A5:
Contractor must provide all equipment and supplies necessary for installation. USDA personnel will provide assistance as needed in receiving shipments and providing access to forklifts and personnel lifts for installation.
A6:
All components must be designed, manufactured and tested in accordance with the latest applicable standards of NEMA, ANSI and UL 845.
A7:
The manufacturer of this equipment must have produced similar electrical equipment for a minimum period of five (5) years. When requested, an acceptable list of installations with similar equipment must be provided, demonstrating compliance with this requirement. A8:
Equipment must be handled and stored in accordance with manufacturer’s instructions. One (1) copy of the instructions must be included with the equipment at time of shipment. A9:
Equipment operation and maintenance manuals must be provided with each assembly shipped and must include instruction leaflets, instruction bulletins and renewal parts lists where applicable, for the complete assembly and each major component.
Specifications (B):
B1 - Voltages: 480 volt, 60HZ 3 phase. Control voltage transformer to provide 24V DC. 120- and 240-volt