Question and Answer Document.pdf

Question and Answer Document

Micro Gin Upgrades

October 20, 2026

1. Motor starter replacement scope

SOW Sections A3 and B4 appear to require both conversion of existing starter control voltages and provision of new starter assemblies.

Does USDA intend for all designated motor starters to be replaced with complete new assemblies, including contactors, electronic overload relays, motor circuit protection, and enclosures? Alternatively, may existing assemblies be retained or modified where they satisfy the new requirements?

A. A few of the existing starters are suitable for conversion. The majority will require all new hardware.

2. Existing disconnect switches and protection

The SOW requires existing wall-mounted fused disconnects to remain in place.

Are the new starters expected to incorporate separate HMCP devices in addition to these existing fused disconnects? Please clarify the intended coordination and equipment configuration.

A. The HMCP requirement is for an approach using a Motor Control Center. If a Motor Control

Center is not to be utilized, which due to time constraints a MCC is not likely to be utilized, ten the HMCP is not required.

3. Existing government-furnished VFDs

The Appendix identifies several VFDs as "On Hand."

•Are these units installed and operational, or stored for future installation?

•Can USDA provide their manufacturers, model numbers, horsepower ratings, and communication interfaces?

•If any government-furnished drive proves defective or incompatible with the new control architecture, how would its replacement be addressed?

A. Existing VFDs are in-place and operational, there are several VFS already installed and the site visit would have been an ideal time to gather the information on the manufacturers, model numbers, horsepower ratings, etc.

All drives currently in-place are operational, should the existing VFD be inadequate for the proposed approach of a particular contractor, replacements would be the responsibility of the contractor.

4. New VFD selection

The SOW identifies Schneider ATV320 among the acceptable VFDs, while the Appendix identifies

Schneider ATV340 as the preferred Schneider series.

Please confirm which model series is acceptable and whether functionally equivalent alternatives meeting the electrical and communication requirements will be considered.

A. ATV340 would be the preferred Schneider series, but others can be considered based on justification of the contractor.

5. Future motor circuits

Motors 30, 31, and 32 are identified as "Future" in the Appendix.

Are complete starters, protection devices, wiring, and PLC connections required for these circuits under the present contract, or is the contractor required to provide only suitable future expansion capacity for USDA to install these devices in the future?

A. All components for these “future” circuits are to be installed and provided under this contract.

6. Existing electrical equipment documentation

Can USDA provide available motor starter schematics, motor connection diagrams, electrical one-line diagrams, panel layouts, existing VFD documentation, and equipment schedules?

A. As a research unit there is limited electrical knowledge resources available. Existing VFD documentation, motor list(s), start-up sequence and proposed auto-start schematic are available in draft form for the most part. Motor starter schematics, motor connection diagrams, electrical one-line diagrams and panel layouts are the responsibility of the potential supplier.

7. Existing 480V power configuration

The SOW identifies a 480V, three-phase, corner-grounded delta system.

Can USDA provide the existing electrical distribution one-line diagram, grounding arrangement, available fault-current information, and relevant transformer specifications?

These details are particularly important for VFD selection and protective-device coordination.

A. Currently we have four different manufacturer's VFDs operating in our micro gin facility. All operate on the corner grounded B phase delta system, either through a dip-switch change or removal of a pre configured fastener. Refer to manufacturer's documentation for specifics.

8. Existing 600A distribution panel

The SOW requires use of the existing 600A service panel.

Should the contractor assume that adequate breaker positions and distribution capacity are available, or is modification of the existing distribution equipment included in the contractor's scope?

A. It is the responsibility for potential suppliers to verify and understand the existing service vs the scope of work. However, the current 600 amp service is ample and operating the existing configuration.

9. Existing conductors and raceways

The SOW permits reuse of existing wiring where practical.

•Are the existing motor power conductors expected to remain in service?

•Are existing control conductors, conduits, and cable trays available for reuse?

•Are there known damaged, abandoned, or undersized electrical circuits requiring replacement?

A. Yes, existing motor power conductors may remain in service, but some new wiring will need to be provided.

Yes existing conductors, conduits, and cable trays are available for reuse.

No known conditions of damaged or undersized electrical circuits exist, however the contractor would need to verify and make recommendations based on their experience and observations.

10. New control console and field equipment locations

Has USDA established the preferred location for the new PLC/HMI console and any associated control enclosures?

May remote I/O cabinets or distributed control equipment be proposed to reduce wiring quantities and improve maintainability?

A. Yes, the HMI console is to be in the location of the existing console for safe and efficient operation of the gin.

Yes, remote I/O cabinets or distributed control equipment may be proposed to reduce wiring quantities and improve maintainability.

11. Installation quantities

During the site visit, we would like to measure relevant wiring routes, distances between equipment, available conduit and cable-tray capacity, and control-panel dimensions.

Would USDA permit photographs of equipment nameplates, existing panel configurations, wiring arrangements, and electrical infrastructure for engineering and estimating purposes, subject to facility restrictions?

A. Yes.

12. I/O quantities and existing instrumentation

The Appendix specifies 230 discrete inputs, 130 discrete outputs, 26 analog inputs, and 20 analog outputs, with 20–25% spare capacity.

Can USDA provide an existing or proposed I/O schedule identifying signal descriptions, field locations, instrumentation types, and available terminal connections?

A. Yes, but only in limited scope. Site visit will be necessary for potential supplier to realize entirety of requirement including location and quantity of field devices. A valve scheme schematic will be made available to clarify a considerable range of requirements.

13. Spare I/O capacity

Does the required 20–25% spare capacity refer to fully installed and wired spare I/O channels, or is available PLC expansion capacity sufficient?

A. Available PLC expansion capacity is sufficient.

14. Existing operating sequences

Does USDA has existing documented sequences available and, if not, what functional operating requirements are to serve as the design basis.

A. Yes, refer to the appendix. The existing sequences are based on standard ginning sequences but with additional flexibilities due to the nature of research operations.

15. HMI-configurable sequencing and interlocks

The SOW requires the ability to modify motor sequencing and interlocks directly through the

HMI without connecting an external programming computer.

Please clarify the intended functionality.

Does USDA require operator adjustment of predefined sequencing parameters, delays, and interlock selections, or the ability to modify the underlying PLC control/flow logic?

This distinction materially affects software architecture and development effort.

A. Research operations require the ability to adjust and modify PLC control flow logic. For expediency, cyber security and research operations adjustments to control flow cannot require connection to an external programming computer and must be able to made at the HMI.

16. HMI display requirements

The SOW specifies an HMI capable of displaying 50 motor start/stop stations on a single screen.

Would a 25-inch Full HD industrial touchscreen satisfy the requirement if it displays all required motor controls and operating indications, with additional screens for detailed equipment status and configuration?

A. Yes, there is quite a bit of flexibility in the final design of the HMI. However, the final HMI design should clearly display the process flow, motor states, and other operational information.

17. VFD communication architecture

Does USDA require all VFDs to communicate with the PLC through industrial Ethernet, or may existing drives use discrete or analog signals where appropriate?

Are there any preferred protocols or network security requirements beyond those identified in the SOW?

A. Communication will be via Ethernet. Discrete and/or analog signals may be used where deemed appropriate. USDA is willing to consider options with sufficient justification.

18. Safety interlocks and emergency stops

Does USDA have an established machinery safety assessment or documented emergency-stop performance requirements?

Please clarify whether the contractor must design a new safety-related control system or integrate existing safety circuits into the upgraded controls.

A. Existing safety circuits should be integrated into the upgraded controls. Emergency-stop performance should clarify with industry norms for the Cotton Ginning industry.

19. Industrial Network

Does USDA require the new PLC/HMI control network to connect to an existing USDA facility network, or may it operate as an independent enclaved, dedicated industrial control network?

A. The system must operate as an independent industrial control network with no connection to an existing USDA network.

20. Facility shutdown and phased installation

The Appendix requires minimizing interruption of the Micro Gin research operations.

•What shutdown durations can USDA accommodate?

•Can electrical installation and equipment replacement be performed in phases?

•Are evening or weekend shutdowns available when necessary?

•Will USDA personnel assist with equipment isolation and operational coordination?

A. While it is recognized shutdowns are required, as minimum as practical is desirable. Work can be performed in phases or equipment placed before connection to minimize shutdowns, but

USDA is flexible with duration of shutdowns.

Evening or weekend shutdowns are not desirable but may be possible. Standard facility access is available from 6:00am until 5:30pm.

USDA personnel will be available for coordination and guidance on equipment isolation and operational aspects.

21. Commissioning and acceptance criteria

What constitutes successful final acceptance?

Will USDA provide qualified operators, processing material, and the necessary equipment availability to conduct complete functional testing under representative operating conditions?

A. Final acceptance is upon completion of requirements as specified in the contract and determined by USDA representatives.

USDA will provide operators and materials to conduct function testing under representative operating conditions.

22. Schedule clarification

The SF 1449 identifies a period of performance from November 9, 2026, through March 8, 2027.

The SOW establishes four months from award, while the Appendix identifies April 1, 2027, as the completion deadline. Please clarify which completion deadline governs the contract.

A. Final completion and full functionality of the system is no later than April 1, 2027.

23. Partial payments for accepted deliverables

The solicitation identifies a single firm-fixed-price contract line item.

Would USDA permit partial invoicing for separately identifiable, completed, inspected, and accepted portions of the installation prior to final system commissioning?

If permitted, may the contractor propose a schedule of values or acceptance milestones identifying equipment assemblies, completed installations, and associated payment amounts?

A. Yes.

24. Trade Agreements – Country of Origin of PLC and Control-System Components

The solicitation incorporates FAR 52.225-5 (Trade Agreements) and identifies several acceptable

PLC platforms, including Allen-Bradley CompactLogix 5380.

Certain components within these PLC platforms, including I/O modules, may originate from countries that are not designated under the Trade Agreements provisions.

•Please clarify how the country-of-origin requirements apply to this turn-key control-system installation. Specifically, is compliance determined at the level of individual PLC/I/O modules and electrical components, or at the level of the completed, integrated control-panel assembly?

•Additionally, please confirm whether PLC platforms expressly identified as acceptable in the

SOW remain eligible when individual components originate from non-designated countries, subject to the applicable country-of-origin determination.

A. Major components must be assembled in a WTO Country.

25. Motor starter arrangement and listing requirements

We understood that the new starters would be individually enclosed, wall-mounted units at or near their existing locations, rather than part of the MCC lineup shown in the Appendix. Is that correct? If so, would equipment listed to the applicable standards for enclosed starters and drives be acceptable in lieu of a UL 845-listed MCC assembly? Since SOW A6 references UL 845, we would appreciate confirmation of the intended requirement in a solicitation amendment, if appropriate. We also understood that 24 VDC starter coils are preferred. As SOW A3 and B4a permit 24 VDC or 120 VAC, could you confirm whether 24 VDC is required or whether either option remains acceptable?

A. Yes, new starters installed at or near their existing locations in lieu of an MCC. Yes the equipment listed would be acceptable in lieu of a UL 845-listed MCC assembly

24 VDC is preferred but 120VAC is acceptable.

26. Locations and arrangement of new VFDs

The Appendix identifies eight new VFDs to be provided. During the site visit, we could not identify designated mounting locations or sufficient available space for these additional units.

Does USDA have a preferred installation arrangement, such as individually enclosed, wall-mounted VFDs near the equipment they serve, co-location under the motor starters, or groups of VFDs consolidated in one or more drive-control cabinets? Alternatively, may the contractor determine the most suitable arrangement based on available space, electrical requirements, and installation efficiency?

If available, we would also appreciate AutoCAD (.dwg) drawings of the existing building and electrical layouts, any proposed automation designs, and drawings identifying the intended mounting locations of the new VFDs, and motor locations.

This information would help us assess available space, wiring routes, equipment configuration, and installation quantities more accurately.

A. All proposed solutions regarding the placement of VFDs are acceptable. What drawings that are available will be provided.

27. Pneumatic diverter valves and position feedback

We understood that USDA would like the pneumatic diverters controlled through 24 VDC solenoids, with confirmation of valve position and route selection incorporated in the HMI recipes. Could you confirm whether the contractor is to furnish new solenoids and position sensors; whether the scope includes valves 1–29 and the eight lint-line valves shown on the drawings; and whether serviceable cylinders and linkages may remain? An updated or final selector drawing, if available, would be especially helpful.

A. Knowing the state of the pneumatic valves is a critical component of the control system. The contractor can accomplish this in multiple ways, new valve bodies with reed switches, proximity sensors on the valves, or other options exist. The contractor is to determine the appropriate way to achieve knowledge of the valve state.

28. Tower drier controls

Thank you for showing us the separate drier controller. We understood that its automation is also part of this modernization scope. Could you clarify whether replacing the drier PLC and integrating its process control into the new system are required? We would also appreciate knowing whether the existing burner management, flame safeguards, and independent high-limit functions are intended to remain in place.

A. The existing burner itself is to remain in place, new controls are to be provided.

29. Gin stand and extractor-feeder controls

We also saw the existing Altivar drive cabinet with its own PLC. Does USDA envision retaining that controller and interfacing it with the new system, or replacing its control functions within the new central PLC?

A. Either option is acceptable.

30. Motor schedule and connected horsepower

The SOW lists 332.75 connected HP, while the motor ratings in Appendix Table 1 appear to total

321.75 HP. Could USDA help reconcile that difference? Also, does motor 21 represent two separate separator fans requiring individual controls and protection? We understand the system is to be designed for 400 HP overall.

A. Table 1 is correct; however the system needs to be designed for expansion. Motor 21 does represent two separate fans requiring individual controls.

31. Starter sizes shown with VFD-controlled motors

Appendix Table 2 lists starter sizes for several motors designated for VFD operation. Could USDA clarify whether separate starters or bypass/isolation contactors are intended for those circuits, whether these entries relate to existing DC motors that USDA intends to replace with AC motors, or whether the entries are for reference only?

A. No DC motors are intended for replacement but the motors should be controlled by the controls system. Starter sizes are provided for informational purposes.

32. Future and additional equipment shown on drawings

Motor 47 is identified as new in Table 2 but appears as future equipment on the process drawing. We also noticed several equipment items on the layout without corresponding entries in the motor schedule. Could USDA confirm which of these items require motor controls under this contract?

A. Motors on the schedule should be controlled under this contract, motors not on the schedule should be able to be controlled via the required expansion capability of the control system.

33. Field devices, motors, and existing wiring

For estimating purposes, could USDA clarify which field instruments, limit switches, transmitters, and local control devices are already provided and which are to be furnished by the contractor?

We also understand USDA supplies the motors; are they already mounted and connected to their local disconnects? Our plan is to reuse existing suitable feeders and raceways to the extent permitted by the SOW.

A. Existing motors and disconnects are in place. Which local controls are in place and reusable is up to the potential contractors to determine. USDA does not provide electrical expertise.

34. Service-panel location and available documentation

The Appendix appears to show two panels marked 600 A. Which one is the panel referenced in

SOW A3? We would also welcome any available one-line diagrams, control schematics, I/O lists, valve diagrams, operating-sequence descriptions, and editable AutoCAD drawings of the existing electrical and automation layouts.

A. The 600A panel on the East Wall is the panel to be used, the proposed new 600A panel is no longer in scope.

35. Submittals and long-lead equipment

Given the compressed schedule, would USDA anticipate reviewing equipment submittals on a rolling basis, allowing long-lead starter and drive orders to be released as those items are approved? Any indication of the expected review turnaround would assist our planning.

A. USDA would review equipment as submitted and ensure rapid turn around and responses to aid in meeting the compressed schedule.