SECTION ELECTRIC MOTORS

Transcription

1 PART 1 GENERAL 1.01 SCOPE OF WORK A. The Contractor shall furnish and install electric motors, accessories and appurtenances as specified herein and in conformance with the individual specifications of driven equipment, to provide a complete and operable installation, all in accordance with the requirements of the Contract Documents RELATED WORK A. Section 16000, Electrical General Provisions B. Division 11, Equipment as applicable C. Division 15, Mechanical as applicable D. Division 16, Electrical as applicable 1.03 REFERENCED STANDARDS A. All work specified herein shall conform to or exceed the applicable requirements of the referenced portions of the following publications to the extent that the provisions thereof 1. NEMA MG 1, Motors and Generators. 2. NEMA MG 2, Safety Standard for Construction and Guide for Selection, Installation and Use of Electric Motors and Generators. 3. NEMA MG 10, Energy Management Guide for Selection and Use of Polyphase Motors. 4. IEEE 43, Recommended Practice for Testing Insulation Resistance of Rotating Machinery. 5. IEEE 85, Standard Test Procedure for Airborne Sound Measurement on Rotating Electric Machinery. 6. IEEE 112, Standard Test Procedure for Polyphase Induction Motors and Generators. 7. IEEE 113, Guide on Test Procedures for DC Machines. 8. IEEE 115, Test Procedures for Synchronous Machines 1.04 SUBMITTALS A. Furnish and submit Shop Drawings in accordance with the requirements of Section 01330, Submittals. TALL OAKS STP

2 B. Complete motor data shall be submitted with the driven machinery shop drawing. Motor data shall include: 1. Machine name and specification number of driven machine. 2. Motor manufacturer information including name, address and telephone number. 3. Motor type or model number. 4. Motor dimension drawing. 5. Nominal horsepower. 6. NEMA design. 7. Frame size. 8. Enclosure. 9. Winding insulation class and treatment. 10. Rated ambient temperature. 11. Service factor. 12. Voltage, phase and frequency rating. 13. Full load current at rated horsepower for application voltage. 14. Starting code letter, or locked rotor kva, or current. 15. Special winding configurations such as part-winding, star-delta, including winding diagram. 16. Rated full load speed. 17. Power Factor at full loaf. 18. Noise certifications and data sheets. 19. Replica of motor nameplate. 20. Bearing types and catalog numbers. 21. Certified Test Results as specified herein and as required. C. If water-cooling is required for motor thrust bearings, the shop drawing submittals shall indicate this requirement. TALL OAKS STP

3 D. The following submittal and specific information shall be provided: 1. General Description: a. Net motor weight shall be noted on the dimensional drawings. Shipping weight shall also be noted if motors are to be shipped separately from the driven equipment. b. Complete motor rating and enclosure type. c. Lists of special characteristics and features being provided as specified. d. Thrust bearing life. e. Type of thrust bearing lubrication. f. Type of guide bearing lubrication. g. For wound rotor motors, a statement that carbons brushes are being provided that are suitable for the low speed, continuous operation specified. 2. Motor Characteristics: a. Guaranteed minimum efficiency at rated load at rated voltage. b. Guaranteed minimum power factor at rated loaded at rated voltage. c. Expected efficiency at 1/2, 3/4, and full load at rated voltage. d. Motor no-load current at rated voltage. e. Full load current at rated voltage. f. Full load current at 110 percent voltage. g. Full load speed. h. Certified copy of test report for identical motor tested in accordance with NEMA MG a and IEEE Standard 112, Test Method B, showing full load efficiency not less than specified value. Motors not as specified will be rejected. i. Recommended maximum kvar of power factor correction capacitors when capacitors are switched with motor. j. Time in seconds motor can be subject to locked rotor current at rated voltage without damage to motor with (1) motor initially at rated ambient temperature, and (2) with motor initially at rated temperature rise. k. Speed torque curves. TALL OAKS STP

4 3. Motor Tests and Test Reports a. Certified copies of test reports of actual motors being provided. b. Short commercial tests, including running light current at rated voltage, high potential and locked rotor current QUALITY ASSURANCE A. Quality assurance shall be in accordance with all applicable requirements of Section 16000, Electrical General Provisions. B. Adjustable frequency drive motors shall be tested as an assembly with the drive and the driven equipment prior to delivery at the site SHOP TESTS A. Each motor of 100 Hp or more shall be completely shop tested to determine compliance with the requirements of the IEEE, ANSI and NEMA. Motors between 25 and 100 Hp shall be tested for efficiency, power factor and be given routine tests as specified below. Tests shall be as follows: 1. Motors larger than 100 Hp a. Each motor shall be tested and furnished with test results certified by the motor manufacturer. Each motor shall be subjected to a complete test consisting of the following: i. Full load heat run ii. Percent slip iii. Running light current iv. Full load current v. Locked rotor current vi. Breakdown torque (calculated) vii. Starting torque viii. Voltages at collector rings (wound rotor) ix. Efficiencies at 100, 75 and 50 percent of full load x. Power factors at 100, 75, 50 percent of full load TALL OAKS STP

5 xi. Vibration check xii. Record of amplitudes and bearing inspection. b. The Engineer reserves the right to witness these tests. Provide a separate vibration test per NEMA MGI Motors from 50 to 100 Hp a. One motor from each group of motors of the same Hp rating and for the same service shall be subjected to a standard, commercial test with results certified by the manufacturer and submitted for review and approval. The standard, commercial test shall include the following: i. Running light current ii. Locked rotor current iii. Secondary voltage at collector rings (wound rotor motors) iv. High potential v. Winding resistance vi. Bearing inspection b. Data sheets shall include test results, efficiencies and power factor at full and 1/2 loads, motor application, manufacturer s type, frame size, I.D. number, bearing type, lubrication medium, insulation and enclosure type. 3. Motors from 10 to 50 Hp a. The motor manufacturer can submit certified data from standard, commercial tests of previously manufactured, electrically duplicate motors. The test data must be current to within five years. The standard, commercial tests (as outlined by paragraph B above) shall be performed with results certified by the manufacturer. b. Data sheets shall include test results, efficiencies and power factor at full and ½ loads, motor application, manufacturer s type, frame size, I.D. number, bearing type, lubrication medium, insulation and enclosure type. 4. Motors less than 10 Hp. Certified test results of manufacturer s routine test shall be submitted for review and approval. B. Efficiency. Motors rates 25 through 250 Hp shall be individually tested for efficiency. C. Test Reports. Eight (8) copies of all test results shall be submitted to the Engineer for approval. Single copies of witnessed test raw data shall be submitted to the Engineer immediately upon completion of such tests. TALL OAKS STP

6 1.07 DELIVERY, STORAGE AND HANDLING A. Delivery, storage and handling shall be in accordance with Section 01666, Product Handling. B. Based on the motor size and weight, motors shall be packed in a secure carton and/or securely fastened to a hardwood skid or pallet for fork truck handling and shall be covered for protection against dirt and moisture during transit and outdoor storage. The motor container shall be clearly identified with permanent ink WARRANTY A. Premium efficient motors shall be warranted for a period of no less than 36 months from date of regulatory agency approval. PART 2 - PRODUCTS 2.01 GENERAL A. Materials and equipment shall be standard products of established manufacturers who have produced continuously the type of equipment specified. All equipment and materials shall be new and of high quality insuring long life and reliable operation. B. Electric motors shall be designed and manufactured to operate satisfactorily under the following conditions, except for specific deviations stated in other Sections of these specifications: i. Continuous severe duty service ii. Altitude below 3,300 feet above sea level iii. Ambient temperature 0 to 40 degrees C maximum iv. Voltage variation plus or minus 10 percent v. Frequency variation plus or minus 10 percent vi. Combined voltage and frequency variation plus or minus 10 percent, frequency variation not to exceed plus or minus 5 percent vii. Premium efficiency for motors rated 20 Hp and above. viii. Inverter rated duty for motors controlled by variable frequency drives. TALL OAKS STP

7 2.02 RATING AND APPLICATIONS A. Unless indicated otherwise in Divisions 11, 13, 14 and 15 in which the design equipment is specified or on the motor data sheets, motor enclosures shall be of the following type(s) approved for its intended purpose: 1. Motors installed indoors and outdoors shall be totally enclosed fan cooled (TEFC) with a service factor of Motors to be installed in classified areas shall conform to the requirements of NEC Article 500. B. Motors shall be rated in accordance with the following, unless otherwise specified. 1. Motors below 0.5 hp shall be rated 115 volts, single phase, 60 Hertz and shall be of the capacitor-start, induction-run type. 2. Motors 0.5 hp through 200 hp inclusive shall be 208 volts, three phase, 60 Hertz. 3. Motors 250 hp and above shall be three phase, 60 Hertz and voltage as specified. C. Motor mechanical design shall be in accordance with this Specification and the detailed requirements indicated on the individual motor data sheets. D. The design and construction of all motors shall be coordinated with the driven equipment requirements. E. Motors shall be designed for full-voltage starting and rated for continuous operation as shown on the Contract Drawings. F. Motors shall operate successfully under running conditions at rated load at plus or minus 10 percent of rated voltage or plus or minus 5 percent of rated frequency or a combination of the two. G. In sizing motors, the horsepower rating of the motor, as stamped on the nameplate, shall not be exceeded during any operating condition of the driven equipment. H. Starting current at full voltage shall not exceed 650 percent of the motor full load current for all integral horsepower alternating current motors. I. All motors shall have a safe stall (locked rotor) time equal to or greater than that maximum accelerating time under the worst voltage condition. J. All motors shall be NEMA Design B unless otherwise specified on the motor data sheet, or required by the application. K. Totally enclosed motors shall be Severe Duty Chemical Service type including shaft seals, internal surfaces coated with corrosion resistant paint or epoxy varnish, external surfaces coated with alkyd paint or epoxy enamel. TALL OAKS STP

8 L. All motors shall be premium-efficiency design, capable of operating at a higher normal efficiency than the standard industry design. 1. Motors built in NEMA Frames 143T through 445T shall have the guaranteed efficiency stamped on the nameplate. The basis for motor efficiency evaluation shall be IEEE test procedure 112, Method B, using accuracy improvements y segregated loss determination including stray load loss measurements. 2. Motors built in frames larger than 445T shall have the guaranteed efficiency stamped on the nameplate. The test method used in determining efficiency (e.g. Method B Dynamometer, Method E Input or Method F Equivalent Circuit) shall be designated by the Contractor ENCLOSURES A. Enclosures shall be rolled steel band or cast iron construction depending on horsepower. End brackets shall be die cast aluminum with steel bearing inserts or cast iron construction. Conduit box shall be die cast aluminum or cast iron construction. B. Motors shall have drain openings suitably located for the type assembly being provided. C. For frames 215 and above, shouldered lifting eyebolts or cast provisions within the frame shall be furnished for handling convenience. D. Motor enclosures shall have a bi-directional, spark-proof, abrasion and corrosive resistant fan made of a material that is strong and durable. Fan will be keyed to shaft on frames 254 and above. Fans shall be accurately balanced before assembly on the motor. E. Motor nameplate shall be mounted on enclosure with stainless steel fastening pins. Nameplate shall have, as a minimum, all information as described in NEMA Standard MG F. Motor bearing numbers shall be included on nameplate. Motor connection diagram shall be attached to motor and easily readable TERMINAL BOXES A. Motor terminal boxes shall be sized larger than required by UL standards; pipe drilled for conduit and shall be attached motor frame with cadmium-plated hex head cap screws. Cover shall be installed with cadmium plated hex head cap screws. The box shall come completely assembled to the motor. B. Motor leads in the conduit box shall be sized in accordance NEC suggested minimum ampacity values using a minimum 125 C insulated lead wire. The wiring shall be clearly identified every inch or the lead shall have a metal band in accordance ANSI C6.1, latest revision. TALL OAKS STP

9 C. Terminal boxes of the split type shall be furnished for each motor unless the base or housing of the motor is of a design which incorporates provisions for incoming cables. D. Terminal boxes for medium-voltage motors shall have sufficient interior space to permit stress cones to be formed on the incoming cables and to permit the cable shields to be properly terminated and grounded. In addition, boxes shall be sized to contain surge protection equipment. E. Separated terminal boxes shall be furnished for each accessory device, such as space eaters, temperature detectors, and other items. F. All boxes shall be heavy-duty class, weather tight and thoroughly coated internally and externally with a corrosion-resistant paint. G. Motors shall be provided with a compression-type grounding mounted in the conduit box by drilling and tapping into the motor frame or by a double-ended cap screw of silicon bronze INSULATION A. The insulation systems shall be Class F with temperature rise (based on maximum ambient temperature of 40 degrees C) of 80 degree C measured by the resistance method. B. Motors constructed in NEMA Frame 365 and larger, except totally enclosed motor, shall be vacuum pressure impregnated with 100 percent solids epoxy resins. The completed insulation shall have a minimum resistance of 10 megohms after 168 hours of testing in a humidity chamber maintained at 100 percent humidity and 40 degree C ambient. In addition, motors with form wound coils shall also meet NEMA MG Qualification Test. C. Totally enclosed motors shall be dipped and baked in epoxy resin. The completed insulation shall have a minimum resistance of 1.5 megohoms after testing as in 2.5B above BEARING AND LUBRICATION HORIZONTAL MOTOR A. All horizontal motors rated 200 hp and below shall have anti-friction bearings, selected to provide a L10 minimum life of 100,000 hours for direct connected motors and 17,500 hours for belt or chain drive motors when belted or chain driven in accordance with the information contained on the data sheets. Further, bearings shall be regreaseable while running via installed grease fittings. B. Bearings on horizontal motors rated 250 hp and larger shall be anti-friction or sleeve-type as indicated on the individual Motor Data sheet(s). Bearings shall be constructed and provided with seals so that dirt, moisture, or lubricant leakage around the seals will not enter the motor. C. Motors which have split capsule type sleeve bearings and split bearing brackets shall be designed to permit bearing replacement without removing the bottom bearing bracket. Reservoirs shall be provided with drains, tapped fill openings and separate level gage glasses. Oil throwers and catchers and close running shaft seals shall be designed to prevent oil escape TALL OAKS STP

10 from the bearings and creepage along the shaft. Vents for equalizing bearing oil pressure shall be provided with screens and caps to prevent the entrance of rodents and the like. D. Motors with sleeve bearings shall have a minimum motor rotor end float and a maximum coupling end float in accordance with NEMA MG1. E. The requirement for bearing temperature protection will be specified on the individual motor data sheets. When specified, protection shall be resistance type bearing temperature detectors 120 ohms at 0 degrees C tip sensitive with leads brought out to the head of the device where suitable connection can be made. The detector holder and head assembly shall be suitable for the area classification in which the motors will be installed. The detectors shall sense the temperature at the outer shell of sleeve type bearings. F. Motors shall be greased type and lubricated with Chevron SRI grease NLGI-2 or equal BEARING AND LUBRICATION VERTICAL MOTORS A. Vertical motors shall be solid shaft or hollow shaft and bearing shall be anti-friction type grease. B. Motors for Process or In-Line service shall be In-Line, Solid Shaft type construction with a clamped and locked bearing arrangement. Mounting and shaft extension dimensions and tolerances shall be in accordance with NEMA MG or The bearings shall be rated for a L10 minimum life of 2 years or 17,500 hours at the maximum expected up or down thrust the drive equipment may impose during startup or operation at any capacity including shutoff SPACE HEATER A. Space heaters shall be supplied to maintain the interior of the motor enclosure above the dew point on all motors 30 hp and larger installed outdoors and on all motors 50 hp and larger installed indoors. B. Heaters shall be unaffected by the accumulation of moisture and shall have terminals adequately protected against moisture under severe weather conditions. Heaters shall be mounted on noncombustible material and shall operate without thermal damage to the motor or themselves. Heaters shall be rated 120 volts single phase. They shall have a maximum sheath temperature of 200 degrees C. C. Leads for the heaters shall be brought out into a terminal box separate from the main power leads terminal box or in a separate cabinet, if required. D. Where motors are provided with space heaters, warning nameplate shall be red background with white letters and shall read: "CAUTION - CONTAINS AN EXTERNAL VOLTAGE SOURCE." TALL OAKS STP

11 2.09 WINDINGS AND WINDING PROTECTION A. Stator windings shall be copper. B. Leads shall be brought out to a terminal box separate from the main power leads terminal box. C. Motors 250 hp and larger or as indicated shall be furnished with surge capacitors and lightning arrestors mounted in the main power leads terminal box or in a separate cabinet, if required. D. Motors controlled by variable frequency shall be supplied with thermostats in two phases as a minimum. Any overload condition shall cause all phases to open GROUNDING A. Each motor shall have a threaded hole in the motor frame with either a bronze bolt and lock washer or a bronze post-type connector for connection to an external ground conductor. The hole shall be for a 1/2 inch bolt or post-type connector except for motors of 100 hp or less where the size of the bolt or post-type connector may be 3/8 inch. The hole in the motor frame shall be threaded to a depth not less than 1 1/2 times the diameter of the hole to ensure a firm connection. If necessary, a metal pad shall be bonded to the motor frame to provide this depth for the threaded hole. The grounding means shall be located on the same side of the motor as the main lead terminal box BALANCE AND VIBRATION A. Motors shall be dynamically balanced. Method of measuring dynamic balance shall be when measured in accordance with NEMA MG or MG and with the maximum amplitude values as shown in NEMA MG B. Motors shall have a maximum peak-to peak amplitude of vibration in accordance with MG when measured in accordance with MG B or MG NOISE A. Maximum sound pressure levels 3 feet from any motor shall not exceed 85dbA. B. All motors shall be "quiet line" type and shall be so indicated on the submittals, Quiet Line type motors shall be capable of operating at a lower noise level than the standard industry design. C. Measurement procedures shall in general be guided by the provisions of IEEE Publication No. 85. TALL OAKS STP

12 2.13 NAMEPLATES A. Each motor shall have a stainless steel resistant nameplate containing information in accordance with NEMA MG1 and as specified below. For motors of 250 hp and larger, the nameplate shall also state any limitations on the number of starts per day, and conditions of restarting. Information to be contained on the nameplate include: 1. Manufacturers type designation 2. Frame number 3. Voltage 4. Full load amperage 5. Output horsepower rating 6. Duty (time ratings) 7. Rated load speed (rpm) 8. Temperature rise in degrees centigrade at rated load 9. Stator voltage testing 10. Rotor open circuit voltage (wound rotor) 11. Stator full load amperes (wound rotors) 12. Service factor (marked for operation at 40 C ambient) 13. Frequency 14. Number of phases 15. Inrush or locked rotor kva 16. Code letter designation 17. Efficiency 18. Bearing type, size, lubricant 2.14 ACCEPTABLE MANUFACTURERS A. Acceptable manufacturers for motors provided under this Section, unless otherwise noted, shall be: TALL OAKS STP

13 1. Teco-Westinghouse Electric Company 5100North IH-35 Round Rock, TX Toll-Free: Telephone: Fax: General Electric Company 3. U.S. Electric Motor Company Division of Emerson Electric Company Toll-Free: Reliance Electric Company 6040 Ponders Court Greenville, SC Telephone: Fax: Baldor Electric Company 5711 R.S. Boreham, Jr. St. P.O. Box 2400 Fort Smith, AR Phone: (479) Fax: (479) Or approved equal 2.15 SPARE PARTS AND TOOLS A. The Contractor shall furnish the following spare parts for each motor or group of motors in the same application. 1. One (1) complete set of all bearings. 2. One (1) complete set of brushes for each group of wound rotor motors. 3. Other manufacturer recommended spare parts. B. Spare parts shall be plainly tagged and marked for identification and reordering. C. Furnish all special tools necessary to disassemble, service, repair and adjust the equipment. TALL OAKS STP

14 PART 3 - EXECUTION AND INSTALLATION 3.01 INSTALLATION A. Motors shall be installed in accordance with the applicable division (i.e. Division 11, 13, 14, or 15), Division 16 electrical and in accordance with the motor manufacturer s drawings and instructions. Field installation of the unit shall include final alignment. B. Contractors shall make provisions to protect motors from moisture by connecting the space heaters. The space heaters shall be connected while in storage and/or before Commissioning. C. Installation shall also include furnishing necessary oil and grease for initial operation and making final adjustments to place the equipment in operable condition FIELD TESTS A. The motors and their driven equipment shall be tested together after installation as described in the applicable Section of Division PAINTING A. Motors shall be shipped to the site with manufacturer s standard finish. After installation and before being placed in final operation, the motors shall be painted in accordance with the requirements of the painting Section of Division 9. END OF SECTION TALL OAKS STP