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CITY OF SANTA r4NA. RFP NO,: 16T090 WATER WELL, PUMP AND MOTOR REPAIR SERVICES 2, When needed, the interiors of motor frames and parts shall he painted with an insulating paint. This includes rottars, bearing brackets, frame interiors and air deflectors. Windings shall not be painted. Incidentals 1, in .the event that the motor Is in poor oondktion and cannot be repaired, reconditioned or made ss new, the Contractor shall notify the Engineer immediately. 2. All incidental parts requiring replacement, such as bearings, coils, etc, shall be considered included. in other iterns of bid and no additional compensation shall be. allowed. 7. REWINDING OF ELECTRIC MOTORS When rewinding is done in conjunction with a recondition or repair; many of the items below will be redundant and shall not be performed or charged for twice, The items below apply to stator only (including all labor, materials and testing necessary for work completion) and shall at a minimum include: a. Pre-nisassembly Test 1. Using a 1 000 meg-ohm meter, conduct verification for insulation integrity. Acceptable criteria is 1.5 meg-ohms or higher. 2. A 5KV meg-ohm meter shall be used to verify insulation Integrity of all 4160V motors. 3. Verify that heaters are operational and other attached features such as thermocouples have continuity, 4. Pre -disassembly documentation shall include the condition of mechanical fits (i.e. shaft run out), cracked, broken or missing parts, test run at full voltage, current readings, meg reading and surge comparison test as received. They Engineer shall be notified if acceptable criteria are not met, b. Stripping 1. Windings shall be removed by tariperature-controlled burnout with oven temperature suppression. Burn -.out temperature shalt not exceed 750.degrees Fahrenheit, 2. Windings shall he removed In such a fashion not to damage or distort the, cons iron., Upon removal of the old windings and insulation, the core shalt be thoroughly cleaned and inspected for burrs, etc. 3. After theburnout procedure, the Contractor shall perform a stator core loss test to ensure the stator laminations are not heat damaged, If the stator core losses exceed four (4) Watts per pound of care steel, notify the Engineer prior to proceeding forward. c. Winding I . General. Rewound motors shall meet or exeeed.ail O.E.M. operating characteristics, unless otherwise specified by the Engineer. NEMA Glass F insulation shall be used, unless otherwise specified. Magnet wire shall be a Quad Build, insulated wire of domestic manufacture that meets or exceeds NEMA specification MW -35A. After winding and prior to resits treatment, windings will be surge -comparison tested and the results documented. 2. The copper cross-sectional area shall be at least as large as the original winding, 3. Resin Treatment: Windings shall be double -dipped with Class M varnish and baked. 4. Check all coils for overall coil' shape. Perform a high frequency turn -to -turn dielectric test (surge test) in accordance with. IEEE 522. Submit test results to the City. This shall be done prior to installation into the stater. d. Motor Leads: Motor lead's that are replaced must be the same length and configuration as the original leads. Leans will be permanently tagged with iron -magnetic markers. Lead lengths shall be identified by the City when 9 request for service is made.