Statement of Work 02-01-18 - DC Servo Motor.pdf

Statement of Work Repair and Refurbish: NEXRAD Direct Current (DC) Servo Motor

ASN: R400-2A1A1B1, NSN: 6105-01-394-5305

Version: February 1, 2018

Description: The Contractor shall repair and refurbish the DC Servo Motor to "Like New" operating condition, including external appearance in accordance with National Weather Service specification drawing no. 2200220 Revision H. The repair and refurbishment price shall include the parts, materials, labor, inspection and return shipping necessary to return the DC Servo Motor to operational specifications. Repair materials differing from the source specification are deemed suitable if cost benefits are shown, National Weather Service approved and performance is not negatively impacted.

Government Furnished Equipment: None

Government Furnished Data: specification drawing no. 2200220 Revision H (when requested)

Vendor Furnished Equipment: As required to accomplish repair and refurbishment actions.

Recommended Equipment and Supplies: None

Frist Article: Please check the Purchase Order (SF1449) for any First Article requirements. If First Articles are required, they will need to be inspected and accepted by the NRC’s Inspection Branch before you will be given the “Notice to Proceed” from the Contracting Officer for the remaining units.

Description of Work – Work Procedures:

The repair and refurbishment shall include the inspection, the replacement and warranty of all worn or damaged parts or components. Some parts and components are required to be replaced with every repaired and refurbished unit. They are listed under “Replacement”. Other items may need repair or replacement on an individual basis dependent on the findings of the inspection and testing of the part.

Items requiring inspection and test for each repaired motor are also listed below under “Inspection/Test”. All motors are to be cleaned and painted to like new condition before return to the

NRC.

(Note: Refer to drawing 2200220 Rev H, item 2.9.3, when replacing the brushes holders and tachometer assemblies.)

Replacement:

1. Replacement of armature brushes, brush holders and caps.

2. Replacement of shaft bearings, seals and seal retaining springs.

3. Replacement of tachometer brushes.

Inspection

4. Inspection/ test/repair/replacement/cleaning of the tachometer. (As required)

5. Inspection/repair/replacement of tachometer brush holder assembly. (As required)

6. Inspection and replacement of housing magnets. (As required)

7. Inspection and rewinding/replacement of the armature. (As required)

8. Inspection/test/repair/replacement of internal wiring, external connectors and connector caps. (As required)

9. Inspection/replacement of the motor housing (including magnets), front plate and motor end cap.

(As required)

10. Ensure thermostat is disconnected (if installed) and pins J1C and D are attached to chassis/ground).

11. Inspection/replacement/reattach identification and serial number plate. (As required)

12. Inspection/refurbishment/replacement of motor shaft to include key slot in accordance with dimensions listed in drawing 2200220 Revision H, Figure 1.

All Motors:

12. Cleaning and painting.

Warranty Terms: Vendor will provide a 1-year warranty against material workmanship and against faults occurring during operation. This 1-year warranty will begin after passing the final equipment inspection and acceptance for stock.

NRC Final Acceptance: All repaired and refurbished DC Servo Motors are subjected to Performance Quality Assurance checks and will be returned for corrections if discrepancies are found. Specifically, the following items will be tested in accordance with specification drawing no. 2200220 Revision H:

-Load Test at rated speed, current draw and back EMF.

-Resistive Checks:

Armature winding resistance (Pin J2H to pin J2I).

Chassis to Ground pin continuity (Pin J2E, Pins J1C and D to chassis/ground).

Armature winding to chassis (Pin J2E to J2M/J2I).

Tachometer commutator resistance (Pin J1A to pin J1B).

-Tachometer “ripple” and Tachometer voltage at a specific motor RPM.

-Form, Fit and Physical appearance (shaft/threads/paint/name plate).

All repaired and refurbished DC Servo Motors will be inspected for material workmanship and tested for operational performance at the NRC. To meet the material workmanship requirements, the motors will need to be in a like new condition and good appearance which will include surfaces which are normally painted be painted, connector caps being in place with cap chain in one piece and oil seal with seal retaining spring correctly installed in motor. The NEXRAD Inspection Unit will verify units meet operational requirements by testing each unit for proper and accurate functionality on a test fixture. Tests performed on the units will include a resistance check of the motor, test of the motor under a load condition at operating speed, and verifying all operational levels and signals are present and at the proper level or any other tests deemed necessary per specification drawing 2200220 Revision H including section 3.1.1.

Deliverables: Each repaired and refurbished DC Servo motor, by serial number, shall be supplied with a Repair Report documenting the repair, refurbishment and inspection to include results of all tests and failure analysis.

Final Note: When unforeseen problems arise that may need clarification, please contact the NRC Matt Zamora at (816) 823-1061. If the unit has a major problem that prevents a quality repair, do not work on the item until the issue can be resolved.

NEXRAD Repair Branch: February 1, 2018; Jeffery Sickels TI&MR Branch Review: February 1, 2018; Gregory Flores