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CITY OFSANTA,ANA <br />RFP NO,: J 6-090 <br />WATER WELL, PUMP AND MOTOR.REPAIR SERVICES <br />2. When needed, the interlors of motor frames and parts shall be painted with an insulating paint. This. <br />includes rotors., bearing brackets, frame interiors and air deflectors, Windings shall hot b.epalnted.. <br />incidentals <br />1- In the event, that the motor [sin poor condition and cannot be repaired, reconclMoned or made as <br />new, the Contractor shall notify the Engineer immediately, <br />2. All incidental parts requiring replacement, such as bearings, coils, eta shall be considered included. <br />in other items of bid and no additional compensation shall be allowed. <br />7, REWINDING OF ELECTRIC MOTORS <br />When rewinding Is done in conjunction with a recondition or repair, many of the items below will be <br />redundant and shall not be performed or charged for twice. The items below apply to stator only (including <br />all labor, materials and testing necessary for work completion) and shall at a minimum include: <br />a. Pre Dlsassem,bly Test <br />1. Using a 1000 meg-ohm meter, conduct verification for insulation integrity. Acceptable criteria is 1.5 <br />meg-ohms or higher,. <br />2. A 5KV meg-ohm meter shall be used to verify insulation integrity of all 4160V motors.. <br />3. Verify that heaters are operational and other attached features such as thermocouples have. <br />continuity. <br />4, Pre- disassembly docurnehtadon shall include the condition of mechanical fits (l,e,. shaft run out), <br />cracked, broken or missing parts, test run at full voltage, current readings, meg reading and surge <br />comparison test as received, The Engineer shallbe notified if acceptable criteria are not met. <br />b. Stripping <br />1. Windingsshall be removed' by temperature -controlled burnout with oven temperature• suppression. <br />Burn -out temperature.shall not exceed 750 degrees Fahrenheit. <br />2. Windings shall be removed' In such a fashion:not to damage or distort the core iron, Upon removal <br />of the old windings and insulation, the core shelf be thoroughly cleaned and inspected, for burrs, efc. <br />3, After the burnout procedure, the Contractor shall perform a stator core loss test to ensure the stator <br />lami'nations.are not heat damaged,. If the stator core fosses exceed four (4) watts per pound of core <br />steel, notify Engineer prior to proceeding forward. <br />c. Winding <br />1. General; Rewound motors shall meet or exceed all Q.E.M. operating characteristics, unless <br />otherwise specified by the Engineer, NEMA Class F insulation shall be used, unless othehMse <br />specified. Magnet wire shall be a Quad Build, insulated wire of domestic manufacture that meets or <br />exceeds NEMA specification MW-35A. After winding and prior to resin treatment, windings will <br />be surge -comparison tested and the results documented. <br />2. The copper cross -sectional area shall be at least as large as the original winding, <br />3„ Resin Treatment: Windings shall be double -dipped with Class H varnish and baked. <br />4. Check all coils for overall coil shape, Perform a high frequency tum-to-turn dielectric test (surge <br />test) In accordance with. IEEE 522, Submit test results to the City, This shall be done prior to <br />installation into the stator. <br />d. Motor Leads: Motor lead's that are replaced must be the same length and configuration as the origlnai <br />leads. Leads will be permanently tagged with non-magnetic markers. Lead lengths shall be identified <br />by the City when a request for service is made. <br />