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CITY OF SANTA AAA..
<br />RFP NO,: 16-090
<br />WATER WELL, PUMP AND MOTOR REPAIR SERVICES
<br />2, When needed, the Interiors of motor frames and parts s,hal(be palntad with an insulating paint. This
<br />includesrotors, bearing brackets, frame interiors and ,air deflectors, Windings shall not be,painted.
<br />Incidentals
<br />1.. In the event that the motor is in poor condition and cannot be repaired, reconditioned or made as
<br />new, the Contractor shall notify the Engineer Immediately,
<br />2. All Incidental parts requiring replacement, such as bearings, coils, etc, 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 voice. 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 -Disassembly 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 documentation shall include the condition of mechanical fits (Le, shaft run out),
<br />cracked, broken or missing parts, test run at full voltage, current readings, meg reading and surge
<br />comparison fest as received., The Engineer shallbe notified if acceptable criteria are not met.
<br />b. Stripping
<br />1, Windings shall be removed by temperature -controlled burnout with oven temperature suppression,
<br />Burn -out temperature shall not exceed 760 degrees Fahrenheit.
<br />2. Windings shai('be removed In such a fashion not to damage or distort the core.lron, Upon removal
<br />of the, old windings and insulation, the core shall be thoroughly cleaned and inspected for burrs, etc.
<br />3, After the burnout procedure, the Contractor shall perform a stator core, loss test to ensure the stator
<br />larnnations are not heat damaged, If the stator core losses exceed four (4) Watts per pound of core
<br />steel, notify the Engineer prior to proceeding forward.
<br />c. Winding
<br />1.. General: Rewound motors shall meet or exceed all 0.E.M, operating characteristics, unless
<br />otherwise specified by the Engineer, NEMA Class F insulation shall be used, unlessotherwise
<br />specified. Magnet wire shall be a Quad Build, Insulated wire of domestic manufacture that meets or
<br />exceeds NEMA spec(ficatlon 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 turn -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 leads that are replaced must be the same length and configuration as the original
<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 />25C-15
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