SOW - Sequoia WI 186.pdf

Page 838 of 872 Rev-0

28 JAN 2022

Work Item 186: Steering System PLC, Upgrade

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to replace and program the steering system PLCs in accordance with Original Equipment Manufacturer (OEM) guidance.

1.2 Government-furnished property.

MTI ITEM DESCRIPTION NSN/PN

QTY ESTIMATED COST

($/UNIT)

N Siemens CPU 1214 NSN: 7042-01-693-4330

PN: 6ES7214-1AG40-0XB0

2 ea. 400.00

N Siemens Expansion Module, S7-

1200, 8 DI, 8 DO

NSN: 5998-01-693-4347

PN: 6ES7223-1BH32-0XB0

2 ea. 255.00

*Government-loaned property, which shall be returned to the vessel upon completion of the availability.

**New or refurbished equipment that the Government may provide for installation in place of existing equipment.

***Government-furnished property, which is to be supplied by either the vessel or the C4IT Service Center.

1.4 Contractor Furnished Property.

MTI ITEM DESCRIPTION NSN/PN

QTY ESTIMATED COST

($/UNIT)

N SIEMENS MEMORY CARD,

S7-1200, 4MB

NSN: 7050-12-414-4763

PN: 6ES7954-8LC03-

0AA0

2 EA. 60.00

2. REFERENCES

COAST GUARD DRAWINGS

Coast Guard Drawing (CGDWG) 225-WLB-561-202, Rev B, JAN 2021, Steering Control Wiring

Diagram

COAST GUARD PUBLICATIONS

Coast Guard Technical Publication (CGTP) 3555, SWBS 561, Section A, Jan 2021, Steering Gear

System- Model 990192-1 Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2020, General

Requirements Surface Forces Logistics Center Standard Specification 3041 (SFLC Std Spec 3041), 2020, Shipboard Electrical Cable Test Surface Forces Logistics Center Standard Specification (SFLC Std Spec) 3042, 2020, Shipboard

Electrical Cable Removal, Relocation, Splice, Repair, and Installation

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OTHER REFERENCES

None

3. REQUIREMENTS

3.1 General.

3.1.1 CIR. The Contractor shall submit a CIR for the inspections listed in the following paragraph(s):

3.5 Acceptance testing

3.1.2 Tech Rep. The Contractor shall provide the services of a Qualified Technical Representative who is familiar with Siemens PLCs and equipped with a laptop loaded with Siemens STEP 7 development software (version 14 or higher) and a communication cable to accomplish the following on site:

Advise on manufacturer's proprietary system information.

Assist with the following installation and repair method(s): remove old PLC and installing new

PLC, load software to Siemens PLC/CPU 1219, connect all cable/wire, and test the Steering Gear System.

Ensure compliance with manufacturer's procedures and standards during system disassembly, inspection, and reassembly as applicable.

3.1.2.1 Ensure the Tech Rep has experience with the system/equipment stated above and demonstrated on their résumé.

3.1.2.2 Submit the name and résumé of the Tech Rep to the COR at the Arrival Conference.

3.1.3 Protective measures. The Contractor shall furnish and install all protective coverings to seal off and protect all non-affected vessel's components, equipment, and spaces near the work area against contamination during the performance of work. Upon completion of work, the Contractor shall remove all installed protective measures, inspect for the presence of contamination, and return all contaminated equipment, components, and spaces to original condition of cleanliness.

3.1.4 Interferences. The Contractor shall handle all interferences in accordance with SFLC Std Spec 0000, paragraph 3.3.5 (Interferences).

3.1.5 Electrical work. The Contractor must accomplish all electrical work in accordance with SFLC Std Spec 3042, and test cables in accordance with SFLC Std Spec 3041. Utilize the existing wire ways for new cable runs as much as possible.

3.2 Removal. The Contractor shall disconnect and remove both the existing PLCs, Allen Bradley Model

SLC-150.

3.2.1 Parts to be removed. Remove the Steering Processor Units (piece 18) and Memory Modules (piece

19) shown on sheet 26 of drawing CG DWG 225-WLB-561-202.

3.2.2 Check wiring. Ensure all wire leads into the PLC are labeled as they will be reused on the replacement PLC. If labels are missing, add them in accordance with SFLC Std Spec 3042.

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3.2.3 Disconnect and dispose. Disconnect Steering Processor Units and Memory Modules and dispose of them in accordance with local ordinances.

3.3 Installation. The Contractor shall install new Siemens model PLCs and reconnect existing wire leads in accordance with sheets 26A, 27A, and 29A of CG DWG 225-WLB-561-202.

3.4 Program and Configure. The Contractor shall program the replacement Siemens PLC using the Siemens development STEP 7 software and configuration files provided by the Government. After installing the software, the replacement Siemens PLCs have to be set in “Run” mode to test Steering Gear system.

3.5 Acceptance testing. The Contractor shall thoroughly test the steering controls and ensure the system is fully operational. Submit a CIR.

3.5.1 Determine success. In the presence of a Government representative, test all probable steering changes and configurations. The system passes testing when tests are completed with no errors or unexplained behavior.

3.5.2 In event of failure. In the event errors or unexplained behavior are encountered, a system groom by the OEM may be required. Submit a CFR recommending that Recurring Work Item (RWI) 56110_RAD_0121_225WLB be authorized.

4. NOTES

This section is not applicable to this work item.