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HomeMy WebLinkAboutVERTICAL TURBINE PUMP - 23-00006 - Hibbard Elemenatry - Fire Sprinkler SUBMITTAL DATA VERTICAL TURBINE ELECTRIC FIRE PUMP 500 GPM @ 95 PSI BOOST PHOENIX FIRE PROTECTION HIBBARD ELEMENTARY REXBURG, IDAHO Customer : NICKERSON COMPANY, INC. - UT (Aurora Project name : Hibbard Elementary Rexburg, Idaho Pump Performance Curve Encompass 2.0 - 22.4.1 0 15 30 45 60 Power - hpPower 0 20 40 60 80 100 120 140 160 180 200 Head - psi7.38 in 60 67 67 74 74 78 78 81 81 82 82 8.07 in 6.46 in Minimum Continuous Stable Flow Max allowable flow Preferred operating region 0 20 40 0 100 200 300 400 500 600 700 800 900 1,000 1,100 1,200 1,300NPSH3 - ftFlow - USgpm NPSH3 Item Number / Tags : Hibbard Elementary Rexburg, Idaho Service : Commercial Fire Quantity : 1 Quote number : PM120922, Phoenix Fire Hibbard Elementary Date last saved : 15 Dec 2022 10:45 AM Flow, rated : 500.0 USgpm Differential head/pressure, rated @ Bowl : 102.0 psi Suction lift : 17.25 ft Lift strategy : Min req'd water level Head/Pressure @ discharge flange : 95.00 psi 150% of rated flow : 750.0 USgpm 65% of rated head @ bowl : 66.60 psi Size : 11FGM Stages : 4 Driver type : Motor Frequency : 60 Speed, rated : 1770 rpm Based on curve number : 11_TURB_2320_1800_SS Rev 180719 Efficiency : 75.10 % Max Shutoff per NFPA : 143.5 psi Power driver, minimum : 50.00 hp General Arrangement BOWL ASSEMBLY, COLUMN & SHAFTING OAL NUMBER OF STAGES NOMINAL COLUMN DIA V W Y Z AG 240 4 6.00 44.81 9.00 11.50 34.00 33.06 DISCHARGE HEAD & BASEPLATE "BD" SIZE DISCH SIZE A B C F G H N S T U 16.50 6 LAD 23.00 10.25 10.00 1.50 1.00 0.88 1.06 24.00 21.00 17.13 Notes: 1. FLANGE RATINGS ARE EITHER 125# OR 250# AS DESIGNATED IN THE CERTIFICATION BLOCK BELOW FOR EACH ORDER SUBMITTAL. 2. NOT FOR CONSTRUCTION, INSTALLATION, OR APPLICATION PURPOSED UNLESS CERTIFIED. 3. DIMENSIONS SHOWN MAY VARY DUE TO NORMAL MANUFACTURING TOLERANCES. 4. BASES ARE DESIGNED TO HAVE FULL CONTACT WITH GROUT OR A SOLE PLATE GROUTED IN PLACE. Pump Information Quote Information Bowl Size:11FGM Stages:4 Listing:UL & FM Customer NICKERSON COMPANY, INC. - UT (Aurora Flow:500.00 Pressure:95.00 psi Max Lift:17.25 ft Quote Number 1836252 Motor:US Motors Power:50.00 hp Flange Rating:125 Lb.Job Name Hibbard Elementary Rexburg, Idaho Frame:326TP Phase:3 Phase Frequency:60 Hz -- Volts:460V V Enclosure:WP-1 Disch Size:6 LAD Item Number Hibbard Elementary Rexburg, Idaho Certified for:-Certified by:-Quote Date 12/09/2022 Encompass 2.0 - 22.4.1 © 2018 Pentair plc AURORA® FIRE PUMPS SELECTION TABLES 60 HERTZ ELECTRIC/DIESEL VERTICAL TURBINE UL LISTED / FM APPROVED STAINLESS STEEL IMPELLERS 500 GPM, 11FGM Section 914 Page 304 Date May 2018 TOTAL HEAD (FT. H20) PRESSURE (PSI)*NUMBER OF STAGES MAX. BHP REQUIRED REQUIRED MOTOR HP RATING FULL LOAD SPEED (RPM) FLANGE RATING (PSI) APPROXIMATE SHIPPING WEIGHT PUMP ONLY (LBS.) APPROXIMATE SHIPPING WEIGHT PER 5' SECTION COLUMN (LBS.)OVER TO (INCLUSIVE) OVER TO (INCLUSIVE) 231 240 100.0 103.9 4 51 50 1775 125 1327 180 5 46 40 1775 125 1413 190 240 250 103.9 108.2 4 54 50 1775 125 1327 180 5 49 50 1775 125 1413 190 250 264 108.2 114.3 4 57 50 1775 125 1327 180 5 52 50 1775 125 1413 190 264 282 114.3 122.1 4 64 60 1775 125 1327 180 5 57 50 1775 125 1413 190 282 298 122.1 129.0 5 63 60 1775 125 1413 190 6 57 50 1775 125 1499 190 298 310 129.0 134.2 5 66 60 1775 125 1413 190 6 61 60 1775 125 1499 190 7 57 50 1775 125 1585 190 310 320 134.2 138.5 5 69 60 1775 125 1413 190 6 64 60 1775 125 1499 190 7 60 60 1775 125 1585 190 320 340 138.5 147.2 5 75 75 1775 250 1413 190 6 69 60 1775 125 1499 190 7 65 60 1775 125 1585 190 340 352 147.2 152.4 5 79 75 1775 250 1413 190 6 74 75 1775 250 1499 190 7 69 60 1775 250 1585 190 352 367 152.4 158.9 6 78 75 1775 250 1499 190 7 73 75 1775 250 1585 190 8 69 60 1775 250 1671 190 367 383 158.9 165.8 6 82 75 1775 250 1499 190 7 77 75 1775 250 1585 190 8 73 75 1775 250 1671 190 383 396 165.8 171.4 6 86 75 1775 250 1499 190 7 81 75 1775 250 1585 190 8 76 75 1775 250 1671 190 396 410 171.4 177.5 6 92 100 1780 250 1499 190 7 86 75 1775 250 1585 190 8 81 75 1775 250 1671 190 410 422 177.5 182.7 6 97 100 1780 250 1499 190 7 90 100 1780 250 1585 190 8 84 75 1775 250 1671 190 422 430 182.7 186.1 7 92 100 1780 250 1585 190 8 86 75 1775 250 1671 190 430 450 186.1 194.8 7 97 100 1780 250 1585 190 8 91 100 1780 250 1671 190 9 86 75 1775 250 1671 205 450 460 194.8 199.1 7 100 100 1780 250 1585 190 8 94 100 1780 250 1671 190 9 90 100 1780 250 1671 205 10 86 75 1775 250 1843 205 460 475 199.1 205.6 7 106 100 1780 250 1585 190 8 99 100 1780 250 1671 190 9 94 100 1780 250 1671 205 10 90 100 1780 250 1843 205 *Pressure based on 1.0 specific gravity Technical Data Vertical Turbine Fire Pump Section 914 Page 106 Date May 1, 2004 Supersedes Section 914 Page 106 Dated June 1, 2001 500 GPM 11FGM NUMBER OF STAGES 4 5 6 7 8 9 10 11 12 Bowl O.D. (in.) 10.86 10.86 10.86 10.86 10.86 10.86 10.86 10.86 10.86 Bowl Kt/(lbs./Foot) 5.02 5.02 5.02 5.02 5.02 5.02 5.02 5.02 5.02 Bowl Ka/(lbs.) 88 110 132 154 176 198 220 242 264 Bowl Shaft Diameter 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 Lineshaft Diameter (1)` 1-1/4 1-1/4 1-1/4 1-1/4 1-1/2 1-1/2 1-1/2 1-1/2 1-1/2 Lineshaft Ks/Foot 4.2 4.2 4.2 4.2 6.0 6.0 6.0 6.0 6.0 “SDC” Discharge Head Size (2) (3) 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 N/A N/A N/A N/A “LAD” Discharge Head Size (2) 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 Column O.D. (in.) 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 Column Weight/Foot (lbs.) 18.97 18.97 18.97 18.97 18.97 18.97 18.97 18.97 18.97 Column Wall Thickness (in.) 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 250 - 300 GPM 10 FEM NUMBER OF STAGES 4 5 6 7 8 9 10 11 12 13 14 15 Bowl O.D. (in.) 9.63 9.63 9.63 9.63 9.63 9.63 9.63 9.63 9.63 9.63 9.63 9.63 Bowl Kt/(lbs./Foot) 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 Bowl Ka/(lbs.) 63.2 79 94.8 110.6 126.4 142.2 158 173.8 189.6 205.4 221.2 237 Bowl Shaft Diameter 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 Lineshaft Diameter (1)` 1 1 1 1 1 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4 1-1/4 Lineshaft Ks/Foot 2.8 2.8 2.8 2.8 2.8 4.2 4.2 4.2 4.2 4.2 4.2 4.2 “SDC” Discharge Head Size (2) 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 N/A N/A N/A N/A N/A N/A N/A N/A “LAD” Discharge Head Size (2) 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 16-1/2x6 Column O.D. (in.) 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 Column Weight/Foot (lbs.) 18.97 18.97 18.97 18.97 18.97 18.97 18.97 18.97 18.97 18.97 18.97 18.97 Column Wall Thickness (in.) 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 0.28 1. For setting using more than 50 feet of column and lineshafting, consult the Factory to ensure adequate lineshaft size. 2. Discharge heads are equipped with dual registers to accommodate drivers from 10” through 24” BD. 3. U.L. Listed Only. 400 GPM 10FEM NUMBER OF STAGES 4 5 6 7 8 9 10 Bowl O.D. (in.) 9.63 9.63 9.63 9.63 9.63 9.63 9.63 Bowl Kt/(lbs./Foot) 3.8 3.8 3.8 3.8 3.8 3.8 3.8 Bowl Ka/(lbs.) 63.2 79 94.8 110.6 126.4 142.2 158 Bowl Shaft Diameter 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 1-7/16 Lineshaft Diameter (1)` 1 1 1 1 1 1-1/4 1-1/4 Lineshaft Ks/Foot 2.8 2.8 2.8 2.8 2.8 4.2 4.2 “SDC” Discharge Head Size (2) 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 N/A N/A N/A “LAD” Discharge Head Size (2) 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 16-1/2 x6 Column O.D. (in.) 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 6-5/8 Column Weight/Foot (lbs.) 18.97 18.97 18.97 18.97 18.97 18.97 18.97 Column Wall Thickness (in.) 0.28 0.28 0.28 0.28 0.28 0.28 0.28 Construction Features Vertical Turbine Fire Pump Section 914 Page 111 Date June 1, 2001 Supersedes Section 913 Page 111 Dated November 1, 1999 Type Vertical Multi-Stage Turbine Rotation Counter-clockwise, Viewed from Driven End Bowls Diffuser Type, Suction Case and Intermediate Bowls with Wearing Rings, Suction Threaded, for Strainer or Flared for Clip On Strainer Impellers Enclosed Type, Single Suction Bearings, Bowl Sleeve Type, Water Lubricated Shaft, Bowl Water Lubricated Column Pipe Threaded Coupling, Column Pipe Threaded, Sleeve Type Shaft, Line Open, Water Lubricated (1) Coupling, Lineshaft Thread or Flanged connection, Surface Type (Refer to Factory) Sleeve, Lineshaft Straight Bearing, Lineshaft Straight, Water Lubricated (1) Retainer, Bearing One Piece Cast, Inter-Locked by Column Joints (For open water-lubricated) (1) Foundation Plate Suitable for Grouting, with Discharge Head Mounting Surface Discharge Head Flanged Connection, Surface Type Stuffing Box Packed, with Bushing and Seal Tap Gland One Piece Auxiliary Connections, Heat Exchanger and Packing Box Drain Discharge Head Coupling, Driver Gib Key with Locknut Strainer Threaded, Basket or Cornucopia; Clip-On Basket (1) Oil lubricated when static water level is 50 to 200 feet below datum. Water level datum greater than 200 feet is not approved for fire pump service. Material Specifications Vertical Turbine Fire Pump Section 914 Page 116 Date June 1, 2001 Supersedes Section 913 Page 116 Dated November 1, 199p ITEM DESCRIPTION MATERIAL SPECIFICATION 1 Adjusting Nut Steel A108GR12L14 6 Water Slinger Neoprene Commerical 7 Discharge Head Cast Iron A48-CL30 8 Packing Capscrew Steel Grade 2 Commercial 9 Gland Half Bronze B584 AL836 11 Gasket Packing Box Tag Board Commercial 12 Pre-Lube Plug (2) Cast Iron Commercial 13 Sleeve Top Shaft Stainless Steel AISI 304 14 Floor Plate Cast Iron A48-CL30 15 Packing Syn. Graphite Impreg. Commercial 16 Gasket Top Flange Tag Board Commercial 17 Packing Box Cast Iron A48-CL30 17A Bushing Packing Box Bronze B505 AL932 18 Flange Top Column Cast Iron A48-CL30 19 Top Shaft Steel AISI 1045 21 Top Column Pipe Steel A53 or A120 22 Coupling Lineshaft Steel A108 GR12L14 23 Lineshaft Steel AISI 1045 24 Coupling Column Steel A53 or A120 25 Bearing Retainer Bronze B584 AL836 26 Bearing Neorprene Commercial 28 Column Pipe, Intermediate Steel A53 or A120 29 Sleeve Intermediate Shaft Stainless Steel AISI 304 30 Column Pipe, Bottom Steel A53 or A120 31 Coupling Pump Shaft Steel A108 GR12L14 32 Pump Shaft Stainless Steel AISI 416 34 Bearing Top Bowl Bronze B505 AL932 35 Bearing Intermediate Bowl Bronze B505 AL932 36 Bowl Intermediate Cast Iron A48-CL30 38 Impeller Bronze (3) B584 AL836 39 Lock Collet Impeller Steel A108 GR12L14 40 Bell Suction Cast Iron A48-CL30 41 Bearing Suction Bell Bronze B505 AL932 42 Strainer Brass Commercial 42A Clip, Strainer Brass Commercial 54A Flange Adapter Cast Iron A48-CL30 55 Top Bowl Cast Iron A48-CL30 58 Sand Collar Steel A108 GR12L14 59 Plug Suction Bell Cast Iron Commercial 88 Set Screw, Sand Collar Steel SAE Bolt Steel 98 Bowl Wear Ring Bronze B505 AL932 NOTE: 1. All material specifications are ASTM except where specified and are for description of chemistry only. 2. When applied with diesel engine driver, remove plug and connect to engine heat exchanger for cooling water. 3. Manufacturer’s option to furnish bronze, per B548-AL875. Subject to change without notice. Sectional Drawing Vertical Turbine Fire Pump Section 914 Page 113 Date June 1, 2001 Supersedes Section 913 Page 113 Dated November 1, 1999 54A 42A 41 42 59 58 88 98 39 40 32 38 36 35 55 34 26 23 30 31 29 28 25 24 31 17A 16 21 19 13 12 11 22 9 8 17 15 6 7 1 18 14 ITEM DESCRIPTION MATERIAL 1 Adjusting Nut Steel 6 Water Slinger Neoprene 7 Discharge Head Cast Iron 8 Capscrew, Packing Box Steel Gr. 2 9 Gland Half Bronze 11 Gasket, Packing Box Tag Board 12 Pre Lube Plug (2) Cast Iron 13 Sleeve, Top Shaft Stainless Steel 14 Foundation Plate Cast Iron 15 Packing Syn. Graphite Impreg. 16 Gasket, Top Flange Tag Board 17 Packing Box Cast Iron 17A Bushing, Packing Box Bronze 18 Flange, Top Column Cast Iron 19 Top Shaft Steel 21 Column Pipe, Top Steel 22 Coupling, Lineshaft Steel 23 Lineshaft Steel 24 Coupling, Column Steel 25 Bearing Retainer Bronze 26 Bearing Neoprene 28 Column Pipe, Intermediate Steel 29 Sleeve, Intermediate Shaft Stainless Steel 30 Column Pipe, Bottom Steel 31 Coupling, Pump Shaft Steel 32 Pump Shaft Stainless Steel 34 Bearing, Top Bowl Bronze 35 Bearing, Intermediate Bowl Bronze 36 Bowl, Intermediate Cast Iron 38 Impeller Bronze 39 Lock Collet, Impeller Steel 40 Bell, Suction Cast Iron 41 Bearing, Suction Bell Bronze 42 Strainer Bronze 42A Clip, Strainer Bronze 54A Flange, Adapter Cast Iron 55 Bowl, Top Cast Iron 58 Sand Collar Steel 59 Plug, Suction Bell Cast Iron 88 Set Screw, Sand Collar Steel 98 Bowl, Wear Ring Bronze 10FEM, 11FGM, 12FCM, 13FGH, & 15FGH LAD Discharge Head – Water Lubrication Only EFFECTIVE: SUPERSEDES: PRINT: SHEET: 1 OF 1 ISSUED BY APPROVED BYNidec Motor Corporation St. Louis, Missouri INFORMATION DISCLOSED ON THIS DOCUMENT IS CONSIDERED PROPRIETARY AND SHALL NOT BE REPRODUCED OR DISCLOSED WITHOUT WRITTEN CONSENT OF NIDEC MOTOR CORPORATION IHP_DP_NMCA (MAR-2011) SOLIDEDGE06-NOV-19 NEW 09-3419DIMENSION PRINTWEATHER PROTECTED TYPE I FRAME: 320TP, TPH BASIC TYPE: RU K. FRIEDMAN T. KIRKLEY 09-3419/- TOLERANCES FACE RUNOUT .004 TIR .004 TIR TOLERANCE ON AK DIMENSION +.003 1 2 3 4 UPPER SUMP OIL FILL 5 UPPER SUMP OIL DRAIN 6 FEATURE LISTING MAIN CONDUIT BOX AIR EXHAUST, 360° AROUND AIR INTAKE UPPER SUMP SIGHT WINDOW NON-MACHINED DIMENSIONS MAY VARY BY ±.25 PERMISSIBLE ECCENTRICITY OF MOUNTING RABBET AA SIZE CONDUIT BF 4 HOLES 6 3 2 4 5 2 13 AJ BF 14.750 13.500 .25 .688 AB AC AF 470 15.88 11.88 4.25 BB MIN AK +.005 C/BOX VOLUME (CU. IN.) 374.65 342.9 17.48 4 403 302 108 UNITS IN MM AA 3.00 6 UNITS IN 16.50 BD MAX MM 419 IN 12.00 MM 305 FRAME 324, 326TP 324, 326TPH PUMP SHAFT, ADJUSTING NUT AND LOCKING SCREWS ARE NOT FURNISHED WITH MOTOR ALL DIMENSIONS ARE IN INCHES AND MILLIMETERS (TOLERANCES ARE IN INCHES) 1. CONDUIT OPENING MAY BE LOACTED IN STEPS OF 90 DEGREES. STANDARD AS SHOWN WITH CONDUIT OPENING DOWN. LARGEST MOTOR WIDTH.2 2 AF 11.06 281 28.22 717 33.31 846 AK BD BE BB 9.81 249 21.69 551 AC AB AJ 45° 20.75 527 9.125 8.250 .19 .438 231.78 209.55 11.135 BE .69 18 8.250 AK .007 TIR .007 TIR +.005 13.500 AK .69 18 4.69 119 NEMA Nominal and Guaranteed Efficiencies are up to 3,300 feet above sea level and 25 ° C ambient. Model Number:DI=25490 Status:PUB Motor Type:RUE Frame:326 MPI:46955 HP:50.00 POLES:4 VOLTS:460 HZ:60 SERVICE FACTOR:1.15 EFFICIENCY (%): S.F.93.1 FULL 93.6 3/4 94.2 1/2 93.9 1/4 91.0 POWER FACTOR (%): S.F.87.7 FULL 87.6 3/4 86.1 1/2 80.7 1/4 63.0 NO LOAD 6.5 LOCKED ROTOR 39.9 AMPS: S.F.66.0 FULL 57.0 3/4 43.0 1/2 31.0 1/4 20.4 NO LOAD 15.4 LOCKED ROTOR 341.0 NEMA CODE LETTER F NEMA DESIGN LETTER B FULL LOAD RPM 1780 NEMA NOMINAL / EFFICIENCY (%)93.6 GUARANTEED EFFICIENCY (%)92.4 MAX KVAR 10.4 AMBIENT (°C)40 ALTITUDE (FASL)3300 SOUND PRESSURE (DBA @ 1M)65.0 TORQUES: BREAKDOWN{% F.L.} 239 LOCKED ROTOR{% F.L.}183 FULL LOAD{LB-FT}147.6 SAFE STALL TIME-HOT (SEC)18 Page 1 of 2 6/12/2021 The Above Data Is Typical, Sinewave Power Unless Noted Otherwise NIDEC MOTOR CORPORATION ST. LOUIS, MO Nidec trademarks followed by the ® symbol are registered with the U.S. Patent and Trademark Office. Page 2 of 2 6/12/2021 EFFECTIVE: 2/27/96 SUPERCEDES: X736618, 96441, 179879, 284138 Connection Plate: 499495 Connection Decal: 912113 499495 Motor Wiring Diagram LEAD CONNECTION Line Each lead may consist of one or more cables having the same lead number. 499495 1 2 3 T1 T2T3DELTA Connection To reverse direction of rotation interchange connections L1 and L2. Each lead may be comprised of one or more cables. Each cable will be marked with the appropriate lead number. 80-29 NIDEC MOTOR CORPORATION ST. LOUIS, MISSOURI ',5(&7,212)527$7,21 vii www.usmotors.com Variable Frequency Drives (VFD) A VFD is a type of controller used to vary the speed of an electric motor. The VFD takes a fixed AC voltage and frequency and allows it to be adjusted in order to get different speeds from the motor. Motor speed can be varied by changing the frequency of the input power waveform. The equation below shows how the frequency affects the speed of a three phase induction motor. How does a VFD work? A VFD takes the fixed frequency and voltage sine wave from the power grid or power station and puts it through a few steps in order to allow the VFD user to vary the frequency and in turn control the motor speed. First it rectifies the AC power into DC Power. Because of this step, a term commonly used instead of VFD is inverter. This only describes one step of what the VFD does to the power waveform. Once rectified into a DC voltage the drive sends the power through a set of transistors or switches. These switches can take the DC waveform and by opening and closing at certain speeds and durations can create an output waveform that mimics the sine wave that is required to drive a three phase electric motor. The output wave form is known as a Pulse Width Modulation (PWM) waveform because the waveform is created by multiple pulses of the switches at short intervals. What variables should be considered when deciding whether to power a motor with a VFD? VFD compatibility with motors is complex. As a result, many variables must be considered when determining the suitability of a particular motor for use with a VFD. These variables include: • Torque requirements (Constant or Variable) • Speed Range • Line / System Voltage • Cable length between the VFD and the motor • Drive switching (carrier) frequency • Motor construction • VFD dv/dt - winding end turn differential in voltage versus differential in time • High temperatures or high humidity • Grouding system Wider speed ranges, higher voltages, higher switching frequencies, insufficient grounding and increased cable lengths all add to the severity of the application and, therefore, the potential for premature motor failure. How does a VFD affect the motor? There are many things to consider when a motor is powered using a VFD or PWM power. When a motor is powered by a PWM waveform the motor windings very often see a large differential voltage, either from phase to phase or turn to turn. When the voltage differential becomes large enough it creates a reaction at the molecular level that converts available oxygen into O3. This phenomenon is called partial discharge or corona. This reaction creates energy in the form of light and heat. This energy has a corrosive effect on the varnish used to protect the motor windings. PWM waveforms can also magnify shaft voltages which lead to arcing across the bearing and causing premature bearing failure. Corrective action must be taken to mitigate these issues that arise when using an electric motor with a VFD. How do I protect the motor? Nidec Motor Corporation (NMC) has developed specific motor designs to decrease the harmful affects that a VFD can have on a motor. NMC’s INVERTER GRADE® insulation system is the first line of defense against corona and phase to phase faults that can be common when a motor is powered using a PWM waveform. The INVERTER GRADE® insulation system is standard on all of NMC’s Inverter Duty products. Along with the INVERTER GRADE® insulation, thermostats are installed as a minimum protection against over heating the motor. Special consideration must also be given to bearings in motors powered by VFD’s. In order to create a low resistance path to ground for built up shaft voltages a shaft grounding device can be used. On larger horsepower motors an insulated bearing system should be used in conjunction with the shaft grounding device when installed, to force the stray shaft voltages to ground. The bearing failures are more prominent on motors with thrust handling bearings. NMC has created an Inverter Duty vertical motor line that not only uses the INVERTER GRADE® insulation system, but that also comes standard with a shaft grounding device. On motors that are 100 HP and greater the thrust bearing is also insulated for additional protection. What does "Inverter Duty" mean? An Inverter Duty motor should describe a motor that helps mitigate potential failure modes of a motor that is powered by a VFD. Inverter duty motor windings should be able to withstand the voltage spikes per NEMA MG1 Part 31.4.4.2 and protect against overheating when the motor is run at slow speeds. On thrust handling bearings it is apparent that the bearings require additional protection. Inverter Duty vertical motors should have a shaft grounding device to protect the motor bearings from fluting due to voltage discharge through the bearing. On larger motors (100HP and larger) the shaft should also be electrically isolated from the frame in order to aid the shaft grounding ring in discharging the shaft voltages to ground. *This information applies only to Integral Horsepower (IHP) motors as defined on the Agency Approval page, under UL®† & CSA®† listings where indicated. Figure 1 PWM Waveform PULSE WIDTH MODULATION WAVEFORM Speed = 120* Fundamental Input Frequency Number of Motor Poles Line to Neutral Voltage Line Current General Information for Integral Horsepower (IHP) Motors on Variable Frequency Drives (VFDs) www.usmotors.com viii Thermal Overloads and Single Phase Motors Motors with thermal overloads installed may not operate properly on a VFD. The current carrying thermal overload is designed for sine wave power. Operation on a VFD may cause nuisance tripping or potentially not protect the motor as would be expected on line power. Thermostats or thermistors installed in the motor and connected properly to the VFD may provide suitable thermal overload protection when operating on a VFD. (consult codes for installation requirements) Single phase motors and other fractional horsepower ratings are not designed to be operated on a VFD. Within Nidec Motor Corporation standard products, all motors NEMA®† 48 frame (5.5” diameter) and smaller are not suitable for VFD applications. Three phase 56 and 143/145 frame applications should be noted on the catalog price page; or if in doubt ask a Nidec Motor Corporation technical representative for recommendations on compatibility with a VFD. Slow Speed Motors Motors with a base design of slower than six poles require special consideration regarding VFD sizing and minimizing harmonic distortion created at the motor terminals due to cable installation characteristics. Additional external PWM waveform filters and shielded motor cables designed for PWM power may be required to provide acceptable motor life. Harmonic distortion on the output waveform should be kept to a minimum level (less than 10%) mismatch impedance. 690V Applications Motors that are rated for 690VAC and that will be powered by 690VAC PWM VFDs require the use of an external filter to limit peak voltage spikes and the use of an INVERTER GRADE® motor. Where available, an alternative to using an output filter is to upgrade to a 2300V insulation system. Low Voltage TITAN® Motors When using 449 frame and larger motors on PWM type VFDs consider the use of an external filter and shielded motor cables designed for PWM power to minimize harmonic distortion and peak voltages at the motor terminals. Harmonic distortion on the output waveform should be kept to a minimum level (less than 10%). Bearing Currents Related to PWM Waveforms Protection of the motor bearings from shaft currents caused by common mode voltages is becoming a standard feature on Inverter Duty motor products. Some installations may be prone to a voltage discharge condition through the motor bearings called Electrical Discharge Machining (EDM) or fluting. Vertical HOLLOSHAFT and HOSTILE DUTY World Motor come with grounding devices installed as standard. EDM damage is related to characteristics of the PWM waveform, and the VFD programming, and installations factors. Bearing Protection on Inverter Duty Vertical Motors All U.S. MOTORS® brand “Inverter Duty” vertical products have a shaft grounding system that allows damaging shaft currents a low resistance path to ground. Bearings on vertical motors fed by VFD power without this bearing protection are not covered under any warranty. All other bearing failure is covered per NMC’s standard warranty. An electric motor repair shop approved to service U.S. MOTORS® brand motors must verify that the cause of the bearing failure was not due to EDM damage. Guideline For Insulated Anti-Friction Bearings Bearing insulation is required to prevent circulating shaft currents which can damage bearings. Circulating shaft current can be caused by use of improper power and/or ground cables, improper grounding systems and higher switching frequencies. Finding and correcting the external condition(s) is the responsibility of the system designer or specifying engineer. To prevent circulating shaft current in motors with anti-friction bearings, Nidec Motor Corporation’s standard practice is to insulate the non-drive end bearing. Adjustable Speed Drives produce a common mode voltage condition. To interrupt common mode voltage on induction motors of all sizes, NEMA MG1-2018 Part 31 recommends insulating both bearings. In cases where both anti-friction bearings are insulated, the system designer or specifying engineer should determine whether to apply one or more of the following options to prevent or reduce shaft currents: sinewave filters, line reactors or mechanical devices, such as shaft grounding or an insulated half coupling. Motors with shaft grounding devices are not suitable for installation in hazardous locations unless housed in an enclosure suitable for the specified Division (or Zone), Class and Group(s). Multiple Motors on a Single VFD Special considerations are required when multiple motors are powered from a single VFD unit. Most VFD manufacturers can provide guidelines for proper motor thermal considerations and starting/stopping of motors. Cable runs from the VFD and each motor can create conditions that will cause extra stress on the motor winding. Filters may be required at the motor to provide maximum motor life. Grounding and Cable Installation Guidelines Proper output winding and grounding practices can be instrumental in minimizing motor related failures caused by PWM waveform characteristics and installation factors. VFD manufacturers typically provide detailed guidelines on the proper grounding of the motor to the VFD and output cable routing. Cabling manufacturers provide recommended cable types for PWM installations and critical information concerning output wiring impedance and capacitance to ground. Integrated Motor and Inverter By integrating the motor and inverter at NMC’s manufacturing facility, many of the motor compatibility problems are minimized or eliminated. During the manufacturing process, the motor is matched to the inverter characteristics which ensures the winding temperature and torque levels meet the design specification. Since the inverter output wiring to the motor is nearly eliminated, bearing currents are rarely experienced. When the unit is properly grounded, reducing the output cable lengths in conjunction with an inverter grade insulation system and low factory setting of the switching frequency of the inverter drive, results in low risk of voltage peaks produced by the PWM waveform. Vertical Motors on VFDs Vertical motors operated on VFD power present unique conditions that may require consideration by the user or installation engineer: • Locked rotor and drive tripping caused by non-reversing-ratchet operation at low motor speeds. It is not recommended to operate motors at less than 1/4 of synchronous speed. If slow speeds are required contact NMC engineering. • Unexpected / unacceptable system vibration and or noise levels caused by the torque pulsation characteristics of the PWM waveform, a system critical frequency falling inside the variable speed range of the process or the added harmonic content of the PWM waveform exciting a system component • Application related problems related to the controlled acceleration/deceleration and torque of the motor on VFD power and the building of system pressure/ load. • The impact the reduction of pump speed has on the down thrust reflected to the pump motor and any minimum thrust requirements of the motor bearings • Water hammer during shutdown damaging the non-reversing ratchet Humidity and Non-operational Conditions The possible build-up of condensation inside the motor due to storage in an uncontrolled environment or non-operational periods in an installation, can lead to an increased rate of premature winding or bearing failures when combined with the stresses associated with PWM waveform characteristics. Moisture and condensation in and on the motor winding over time can provide tracking paths to ground, lower the resistance of the motor winding to ground, and lower the Corona Inception Voltage (CIV) level of the winding. Proper storage and maintenance guidelines are important to minimize the potential of premature failures. Space heaters or trickle voltage heating methods are the common methods for drying out a winding that has low resistance readings. Damage caused by these factors are not covered by the limited warranty provided for the motor unless appropriate heating methods are properly utilized during non-operational periods and prior to motor start-up. NEMA®† Application Guide for AC Adjustable Speed Drive Systems: http://www. nema.org/stds/acadjustable.cfm#download Motor / Inverter Compatibility * This information applies only to Integral Horsepower (IHP) motors as defined on the Agency Approval page, under UL®† & CSA®† listings where indicated. ix www.usmotors.com • On TITAN® frame motors, inquiry required for suitability on constant torque loads. Cable distances are for reference only and can be further limited by hot and humid environments (refer to Table 1). Refer to specific VFD manufacturers cable limits. Refer to the Motor/ Inverter Compatibility page for special consideration of vertical motor bearings. Warranty Period Clarifications and Exceptions Standard Energy Efficient Exclusion Applying Standard & Energy Efficient Motors on Variable Frequency Drives is not recommended. VFD related failures on standard and energy efficient motors will not be covered under warranty. Vertical Motor Windings Premium efficient vertical motors without INVERTER GRADE® insulation that are installed using the criteria described in this document and applied in the correct applications shall have a warranty while powered by a VFD for 12 months from date of installation or 18 months from date of manufacturing whichever comes first. See limited warranty page for horizontal motor warranty periods. Bearing Exclusion for Thrust Handling Bearings Bearings used in premium efficienct vertical motors, and all thrust handling bearings, that are powered by VFDs without shaft grounding devices or insulated bearings (when required) will not be covered under any warranty for damages caused from being powered by a VFD. All other bearing failure is covered per NMC’s standard warranty. An electric motor repair shop approved to service U.S. MOTORS® brand motors must verify that the cause of the bearing failure was not due to Electrical Discharge Machining. Medium Voltage and Slow Speed Considerations Motors that are rated above 700 VAC or that are eight pole and slower require special consideration and installation and are not covered under the warranty guidelines in this document. Motors that are rated above 700VAC have special cable length and voltage differential issues that are specific to the VFD type and manufacture. The motor construction and cost may vary dramatically depending on the VFD topology and construction. Contact your NMC representative with VFD manufacturer name and model type for application and motor construction considerations. Motors that are designed eight pole and slower also require special installation and filters per the drive manufacturer. Warranty Guidelines for Integral Horsepower (IHP)* Motors on Variable Frequency Drives Warranty Guidelines The information in the following section refers to the motor and drive application guidelines and limitations for warranty. Hazardous Location Motors Use of a variable frequency drive with the motors in this catalog, intended for use in hazardous locations, is only approved for Division1, Class I, Group D hazardous location motors with a T2B temperature code, with a limitation of 2:1 constant torque or 10:1 variable torque output. No other stock hazardous location motors are inherently suitable for operation with a variable frequency drive. If other requirements are needed, including non-listed Division 2, please contact your Nidec Motor Corporation territory manager to conduct an engineering inquiry. 575 Volt Motors 575 volt motors can be applied on Inverters when output filters are used. Contact the drive manufacturer for filter selection and installation requirements. Applying INVERTER GRADE® Insulated Motors on Variable Frequency Drives (2, 4, 6 pole) The products within this catalog labeled “Inverter Duty” or “Vector Duty” are considered INVERTER GRADE® insulated motors. INVERTER GRADE® motors exceed the NEMA®† MG-1 Part 31 standard. Nidec Motor Corporation provides a three-year limited warranty on all NEMA®† frame INVERTER GRADE® insulated motors and allows long cable runs between the motor and the VFD (limited to 400 feet without output filters). Cable distance can be further limited by hot and humid environments and VFD manufacturers cable limits. These motors may be appropriate for certain severe inverter applications or when the factors relating to the end use application are undefined (such as spares). Nidec Motor Corporation’s U.S. Motors® brand is available in the following INVERTER GRADE® insulated motors: • Inverter Duty NEMA®† frame motors good for 20:1 Variable Torque & 5:1 Constant Torque, including Vertical Type RUSI (10:1 V.T.) • Inverter Duty motors rated for 20:1 Constant Torque • ACCU-Torq® and Vector Duty Motors with full torque to 0 Speed or 5000:1 • 841 Plus® NEMA®† Frame Motors Applying Premium Efficient motors (that do not have INVERTER GRADE® insulation) on Variable Frequency Drives (2, 4, 6 pole) Premium efficient motors without INVERTER GRADE insulation meet minimum NEMA®† MG-1, Section IV, Part 31.4.4.2. These motors can be used with Variable Frequency Drives (with a reduced warranty period) under the following parameters: • On NEMA®† frame 447 and smaller motors, 20:1 speed rating on variable torque loads & 4:1 speed range on constant torque loads. • On TITAN® 449 and larger frame motors, 10:1 speed rating on variable torque loads. Table 1 - Cable Distances Maximum Cable Distance VFD to Motor Switching Frequency 460 Volt 230 Volt 380 Volt 3 Khz 127 ft 400 ft 218 ft 6 Khz 90 ft 307 ft 154 ft 9 Khz 73 ft 251 ft 126 ft 12 Khz 64 ft 217 ft 109 ft 15 Khz 57 ft 194 ft 98 ft 20 Khz 49 ft 168 ft 85 ft * This information applies only to Integral Horsepower (IHP) motors as defined on the Agency Approval page, under UL®† & CSA®† listings where indicated .