10 Application Information - Galco Industrial Electronics
Contents
1. ENCLOSURE EFFICIENCY VARIABLE TORQUE CONSTANT TORQUE ALL FRAMES 56 143 215 254 286 324 365 404 449 NEMA Motors ALL POLES ALL POLES 2 Pole 4 amp 6 Pole 2 Pole 4 amp 6 Pole 2 Pole 4 amp 6 Pole 2 Pole 4 amp 6 Pole Standard EPAct exempt 10 1 2 1 Ail 2il Contact Engineering ODP EPAct compliant 10 1 N A 2 1 2 1 2 1 2 1 Contact Engineering NEMA Premium XRI 10 1 N A 10 1 10 1 10 1 10 1 10 1 10 1 2 1 2 1 Standard EPAct exempt 10 1 2 1 2 1 2il Contact Engineering TEFC EPAct compliant 10 1 N A 2 1 10 1 2 1 10 1 2 1 2 1 2 1 2 1 NEMA Premium XRI 10 1 N A 2 1 20 1 2 1 20 1 2 1 20 1 1 2 1 20 1 1 TENV EPAct compliant 10 1 NWA 1000 1 1000 1 1000 1 1000 1 1000 1 1000 1 1000 1 1000 1 NEMA Premium XRI 10 1 1000 1 1000 1 1000 1 1000 1 1000 1 1000 1 1000 1 1000 1 1000 1 Washdown TEFC Standard EPAct exempt 10 1 10 1 2 10 1 2 10 1 2 N A N A N A N A N A N A EPAct compliant 10 1 N A 10 1 2 10 1 2 N A N A N A N A N A N A Washdown TENV Standard EPAct exempt 10 1 1000 1 1000 1 1000 1 N A N A N A N A N A N A EPAct compliant 10 1 N A 1000 1 1000 1 N A N A N A N A N A N A Se Explosion Proof motors must be properly nameplated with inverter duty information prior to use on VFD See Marathon catalog Explosion Broor Al eficiency levels pages for specific rating capabilities Motors with automatic overload protectors cannot be used on VFDs IEC Motors ALL FRAMES 63 90 100 225 All Enclosures A2. Vector Duty motors can be applied to Volts Hertz scalar drives as well Marathon Electric s MAX family consisting of Blue Max Black Max and microMAX motors have been specifically designed for optimal operation on vector or volts hertz controls These motors feature a wide constant torque up to 2000 1 and or constant horsepower up to 4 1 speed range and are performance matched to all current technology IGBT drives Vector Duty motors meet or exceed the requirements of NEMA MG1 Part 31 and are equipped with an enhanced insulation system MAX GUARD or CR to provide many years of trouble free service Consult the catalog page for each product s capabilities and features As these motors are specifically designed for operation through an inverter they are exempt from EPAct legislation Model numbers contain the letter H in the Electrical Type field VARIABLE TORQUE LOADS Applications include fans blowers and centrifugal pumps Torque varies as the square of the speed and horsepower as the cube of the speed Operation below base speed significantly lightens the load on the motor While most variable torque applications do not require the motor to operate below half speed the motor is fully capable of operation to zero speed Operation above base speed significantly adds to the load on the motor therefore a factory representative must review applications requiring variable torque above bas
3. except large scale stationary and industrial tools e Toys leisure and sports equipment e Automatic dispensers In addition to the exemption above the Directives do not currently apply to medical devices monitoring and control instruments spare parts for the repair or reuse of electrical and electronic equipment placed on the market before July 1 2006 and most military and state security equipment Regal Beloit Corporation worked closely with suppliers to assure that product falling within the scope of these directives meets the specified levels of these substances The directives took affect July 1st 2006 however many products were converted in May and June The products converted are motors in NEMA frame size 145 and below both AC and DC motors with the following exceptions e Sleeve bearing motors an exemption has been applied for A compliant ball bearing equivalent motor can be ordered e Brake motors in 56 145 frame will have to be ordered specifically as ROHS compliant e Some motors with specialty electro mechanical components BEARINGS FRAME SIZE STANDARD TYPE COMMENTS 48 Shield Ball Sleeve bearing as noted 56 145T Sealed Ball 182 444T Double Shield Ball 284 449TS Single Shield Ball 445T 6805 Double Shield Ball Direct coupled loads 445T 6805 Roller DE Ball Belted loads Belting data must be provided on all belted applications Standard horizontal motors can be mounted in a vertical shaft down or
4. Frequency Hz Number of Poles per phase Torque A turning force applied to a shaft tending to cause rotation Torque is normally measured in pound feet and is equal to the force applied times the radius through which it acts Torque to Inertia Ratio The rated motor torque divided by its rotor inertia Helps determine a motor s ability to accelerate loads and or respond to commands from a drive to change speed or direction SB300 Prices and Specifications are subject to change without notice Application Information FORMULAS amp CONVERSION FACTORS HP x 5250 Torque Ib ft RPM _ Torque Ib ft x_RPM we 5250 120 x Frequency Synchronous RPM 4 Poles Ohms Volts Amperes R E I Amperes Volts Ohms I E R Volts Amperes x Ohms E IR Newton meters torque 1 3558 x Ib ft Pound feet torque 7376 x Newton meters Horsepower 746 watts 746 KW Kilowatts KW 1 341 x Horsepower Temperature Celsius 5 9 x F 32 Temperature Fahrenheit 9 5 x C 32 C marathon electric zZ c Lla zZ l Q a lt 15 Variable Speed Operation Guidelines for Application of General Purpose Three Phase Single Speed Motors on Variable Frequency Drives Meets NEMA MG1 2003 Part 30 and Part 31 Section 4 4 2 Unless stated otherwise motor nameplates do NOT include listed speed range
5. gt a D 5 SQ f z Z pun Ez Eg z z Application Information AGENCY LISTINGS UL and CSA Where applicable Marathon Electric s motors are UL Listed for explosion proof enclosures UL Recognized construction for non explosion proof enclosures and UL Recognized as a motor protector combination Our motors are also CSA Certified for both explosion proof and non explosion proof enclosures AC Motors Non Explosion Proof UL File No CSA File No NEMA 48 449 Frame E49747 LR2025 NEMA 500 and 5000 Frame LR2025 IEC 63 90 Frame E49747 LR2025 IEC 100 280 Frame E49747 LR2025 Does not include coverage for use with VFD Domestic product only Explosion Proof UL File No CSA File No NEMA 56 326 Frame E12044 LR47504 NEMA 364 449 Frame E12044 LR21839 Fire Pump Motors UL File No CSA File No NEMA 143 510 EX5190 LR2025 PMDC Motors Non Explosion Proof _UL File No CSA File No NEMA 56 145 E57948 LR33543 CE Conformity Europeanne CE marking on the nameplates of Marathon Electric motors is available upon request Note that only the Low Voltage directive applies to electric motors Contact a factory representative for details Non explosion proof microMAX BlackMax and BlueMax TENV and TEFC standard catalog models have the CE Mark on the nameplate ATEX Directive Atmospheres Explosibles Mandatory by law the European Union EU Directive 94 9 EC requires that electric
6. motors in contact with a potential ignition source carry the CE mark notified body identifier Ex symbol equipment group and category plus the date code NEMA National Electrical Manufacturers Ass n All Marathon Electric motors are manufactured in accordance with all applicable NEMA standards in MG1 2003 When applied in accordance with the Guidelines for Application of Three Phase Motors on Variable Frequency Drives Marathon Electric motors are in full compliance with NEMA MG1 2003 Part 31 Section 4 4 2 as pertaining to voltage spikes 460 volt motors must withstand voltage spikes of up to 1426 volts 575 volt motors must withstand spikes up to 1788 volts See Insulation Systems for additional detail on this subject Commitment to RoHS and WEEE European Directives European Directive 2002 95 EC Restriction of Use of Certain Hazardous Substances ROHS and Directive 2002 96 EC Directives on Waste Electrical and Electronic Equipment WEEE were enacted to control the amount of certain hazardous substances contained in products shipped into the E U Restricted substances include lead mercury cadmium hexavalent chromium polybrominated biphenyls and polybrominated dipheynl ethers 10 marathon electric The scope of products covered affecting motors is e Large household appliances e Small household appliances IT and telecommunications equipment Consumer equipment e Electrical and electronic tools
7. mounted in a vertical shaft down orientation Horizontal motors should never be mounted in a vertical shaft up orientation without consulting your application engineer as this practice can cause damage to the motor which is not covered under warranty Brakemotors should not be mounted vertically up or down unless the brake has been specifically designed for such B300 Prices and Specifications are subject to change without notice Application Information NEMA SERVICE FACTOR RATINGS The table below lists the NEMA service factors for single phase dripproof motors Totally enclosed and explosion proof motors have 1 0 service factor except where noted Single Phase NEMA SERVICE FACTOR RPM LISTED HP 3600 1800 1200 900 1 12 1 4 1 4 1 4 1 4 1 8 1 4 1 4 1 4 1 4 1 6 1 35 1 35 1 35 1 35 1 4 1 35 1 35 1 35 1 35 1 3 1 35 1 35 1 35 1 35 1 2 1 25 1 25 1 25 1 15 3 4 1 25 1 25 1 15 1 15 1 1 25 1 15 1 15 1 15 1 5 amp Up 1 15 1 15 1 15 1 15 OVERLOAD PROTECTION There are four choices in protection manual inherent type automatic inherent type thermostats and none A manual overload must be physically reset to restart the motor An automatic thermal overload will stop the motor when it is overloaded or overheated and restart it after the motor has cooled down None means the motor has no protection Thermostats are embedded in the winding and connected to the motor starter control circuit Marathon Electric s standards are
8. speeds Desired speed range of the load and motor Acceleration and deceleration rate requirements of the process being controlled Starting requirements including the frequency of starting and a description of the load reflected inertia at the motor load torque during starting Whether the application is a continuous process or duty cycle of starts stops and speed changes A general description of the type of application including the environment in which the VFD system components must operate determines motor enclosure and or explosion proof classification Typical Temperature Rise Of Various Enclosures Temp Rise 36 15 30 45 60 Rated Torque SB300 Prices and Specifications are subject to change without notice Description of the available electrical power supply and wiring Special performance requirements if any Whether the drive will be configured with a by pass circuit In case of its deployment the motor will operate like its fixed speed counterpart and may require a NEMA B design which limits in rush current or selection of a larger motor starter or other protective circuitry Load sharing Mounting and other mechanical considerations Hz 90 120 Rated Power e marathon 19 electric zZ s Lu Q i Lu Lu Q N Lu co c lt gt
9. able Speed Operation CONSTANT TORQUE LOADS Cont d Applications requiring greater than 20 1 C T are ideal for microMAX Black Max or Blue Max motors These motors provide full rated torque within their listed speed range without exceeding a Class F temperature rating while under inverter power many operate at Class B Ratings in this catalog have been developed based on extensive testing on IGBT inverters set at a minimum 3 KHz or equivalent carrier frequency Vector Duty and Inverter Duty motors from Marathon Electric are designed for operation at 150 of rated load for one minute up to the base speed of the motor overload capability declines to 100 as the motor reaches maximum constant HP speed These motors accommodate constant horsepower operation to 1 1 2 to 2 times base speed subject to the motor s maximum safe mechanical speed limit Refer to the Maximum Safe Mechanical Speed Chart as well as the performance section for each motor s capability Motors rated for zero RPM continuous duty 1000 1 or 2000 1 must be powered by vector drives to produce rated torque without overheating Optimum zero speed and low speed full torque performance may require a closed loop vector drive with encoder feedback CONSTANT HORSEPOWER LOADS Applications include coil winders band saws grinders and turret lathes Operation requires the motor to deliver the same horsepower rating regardless of shaft speed Torqu
10. be grounded in accordance with the National Electric Code NEC Article 430 Refer to NEC Article 250 for 18 marathon electric general information on grounding Proper grounding of inverter driven motors is essential to protect personnel and livestock from inverter sourced common mode voltages which may reach hazardous levels on the frame of ungrounded or poorly grounded motors LOW INPUT VOLTAGE If due to lower utility supply voltage the input voltage from the VFD to the motor is lower than the motor s rated voltage de rating of the motor s base frequency horsepower full load RPM and constant HP RPM is required The revised values can be calculated by multiplying by the ratio of the voltage change For example to operate a 460 volt motor from an inverter fed by 50 or 60 HZ 400 volt utility power the multiplier is 400 460 or 0 87 The VFD can be reprogrammed to match the new base point values allowing the motor to provide rated torque at rated current from the new base speed down to its original minimum Constant torque speed The motor s CHP range will begin at the new base frequency and will be shortened by the same ratio as described above OVERSPEED CAPABILITY Maximum safe mechanical speed capability is a function of bearing size and type lubrication rotor balancing technique and specifications air gap enclosure frame construction and connection to the driven load In addition consideration must be given
11. ble Gases Vapors or Mists Combustible Dusts Europe ATEX Europe ATEX North America Category G Gases North America Category D Dusts Division 1 Division 2 Zonet Zoned Division 1 Zone 22 Explosion Flameproof Non Sparking Explosion piidsion2 Flameproof Non Sparking Proof Proof gt a uv 4 S zZ z pn Ex z Group is not applicable to that Division or Zone or is not defined Group is not available from Marathon Electric Marathon Electric Hazardous Duty Motor Temperature Code Chart Division 1 Explosion Proof Zone 1 Flameproof Division 2 Zone 2 Non Sparking TEMPERATURE Class I Area Classification Class Il Area Classification Class I Area Classification CODES Flammable Gases Vapors or Mists Combustible Dusts Flammable Gases Vapors or Mists Temp UL CSA ATEX Division 1 Zone 1 Division 1 Zone 21 Division 2 Zone 2 Explosion Proof Class Group D 7 XRI Severe Duty amp IEEE 841 1 15 S F 260 C T2B T2 260 Class Groups A B C D Sine wave power Available through Marathon s Mod Central o on Totally Enclosed EPAct XRI XRI Severe Duty ZIE 129 Han or IEEE 841 1 0 S F on PWM VFD Class I Groups A B C D Available through Marathon s Mod Central on Totally Enclosed EPAct XRI XRI Severe Duty 200 C T3 T3 or IEEE 841 1 0 S F Sine wave power Class I Groups A B C D Explosion Proof Class Group D Explosion Proof Class II ESZE T3B T3 165 Group C as
12. change without notice TERMINOLOGY Shock Load The load seen by a clutch brake or motor in a system that transmits high peak loads This type of load is present in crushers separators grinders conveyors winches and cranes Slip The difference between the speed of the rotating magnetic field synchronous speed and mechanical rotational speed rotor speed of AC induction motors Usually expressed as a percentage of synchronous speed Special Purpose Motor A motor with special operating characteristics special mechanical construction or both designed for a particular application and not falling within the definition of a general purpose or definite purpose motor NEMA Speed Range The minimum and maximum speeds at which a motor must operate under constant or variable torque load conditions A 50 1 speed range for a motor with top speed of 1800 RPM means the motor must operate as low as 36 RPM and still operate within specifications Starting Torque The torque exerted by the motor during the starting period Stator The stationary portion of the magnetic circuit and the associated windings and leads of a rotating machine Synchronous Speed The speed of an AC induction motor s rotating magnetic field It is determined by the frequency applied to the stator and the number of magnetic poles present in each phase of the stator windings Mathematically it is expressed as Sync Speed RPM 120 x Applied
13. closed non ventilated motors are NOT cooled by external means Totally enclosed fan cooled motors are cooled by external means that are part of the motor but not in the internal workings of the motor Totally enclosed air over motors are sufficiently cooled by external means provided by the customer HAZARDOUS DUTY Hazardous Duty motors are totally enclosed fan cooled or non ventilated motors designed for applications in hazardous atmospheres containing explosive gases and or combustible dusts SB300 Prices and Specifications are subject to change without notice Application Information North American installations North American standards for electric motors generally fall into one of two divisions Division 1 Explosion Proof motors are UL Listed in accordance with NFPA Class Flammable Gases or Class II Combustible Dusts and Groups gases or dusts depending upon the atmosphere Division 2 motors are CSA Certified and are marked similarly to Division 1 equipment Inverter Duty motors through 449T are CSA Certified for use in Division 2 locations European installations Motors for hazardous locations in Europe must meet a different set of standards and require different markings than those of North America CENELEC sets the standards for equipment in hazardous locations for Europe Motors for explosive atmospheres in Europe are often referred to as flameproof or non sparking motors These motors must comply with th
14. ctric when applying motors and drives into Hazardous Locations either Division Zone 1 or Division Zone 2 areas UL and CSA policies prohibit the installation of bearing protection devices such as shaft grounding brushes rings or insulated bearings on motors in Hazardous Locations Maximum Cable Lengths from the Motor to Drive PRODUCT 3 HKz CARRIER FREQUENCY PHASE TO PHASE DESCRIPTION 230 VOLT 460 VOLT 575 VOLT 56 326 NEMA 100 225 IEC Frames 600 ft i25 it 40 ft 364 5013 NEMA 250 315 IEC Frames 1000 ft 225 ft 60 ft Motors with CR Corona Resistant Magnet Wire 1500 ft 475 ft 140 ft Motors with MAX GUARD insulation system Unlimited Unlimited 650 ft Form wound low voltage motors Unlimited Unlimited 650 ft Higher carrier frequencies require shorter cable length to obtain normal 50Khrs insulation life Standard Motor Insulation Systems CR200 CORONA RESISTANT MAGNET W IRE Max Guard microMAx inverter duty Black Max Vector Duty 4 in 1 Three Phase C Face with Removable Base Standard Three Phase stock Brakemotors Blue Chip Severe Duty Explosion Proof EPACT Efficiency Blue Max Vector Duty Three Phase PowerWash XT and SXT washdown Blue Chip XRI Severe Duty Blue Chip XRI 841 IEEE841 compliant Automotive Duty T Frame Blue Chip Explosion Proof XRI Premium Efficiency Globetrotter IEC Metric motors 16 marathon electric SB300 Prices and Specifications are s
15. e ATEX Directive The ATEX Directive covers all electrical equipment used in explosive atmospheres To ensure compliance with the Directive equipment must meet the essential ATEX requirements and carry the CE mark on the nameplate Other information required on the nameplate is the Ex symbol group amp category date code EEx protection method gas group and temperature code Example EEx d IIB T4 CE0359 Ex II 2 G D 2004 The tables on page 12 describe Marathon Electrics capabilities by Area Classification and by Temperature Code IEC DEGREES OF PROTECTION vs MARATHON ELECTRIC S STANDARD CONSTRUCTION The enclosure terminology for an IEC motor is a combination of the IP Ingress Protection and IC Inherent Cooling codes Each number in the IP code stands for a different degree of protection IP12 Dripproof IP22 Dripproof with screens or die cast aluminum bracket IP43 Totally Enclosed IP54 Totally Enclosed Severe Duty IP55 Totally Enclosed Severe Duty with V Ring Shaft seals and or Smart Ring rotating shaft seal and Neoprene gaskets IP56 Totally Enclosed Severe Duty with rotating Shaft seals eg Inpro Seal VBX bearing isolator and Neoprene gaskets C marathon 1 om electric am o U l a a g Application Information Marathon Electric Hazardous Duty Motor Area Classification Chart Class I Area Classification Class Il Area Classification Flamma
16. e increases at low speed and decreases at higher speed Most general purpose motors can deliver constant horsepower up to 1 1 2 times base speed consult a factory representative to verify performance However many constant HP applications require operation to twice base speed and some such as coil winders up to 4 times base speed microMAX Black Max and Blue Max motors are designed for 1 1 2 to 2 times base speed and the Wide CHP motors found in Marathon s SB371 Catalog deliver up to 4 times constant horsepower performance BEARING CURRENTS As stated in NEMA MG1 31 4 4 3 to protect a motor from inverter sourced shaft voltages either both bearings must be insulated or the motor shaft must be effectively grounded Marathon Electric offers several effective means to protect the bearings from inverter sourced EDM electrical discharge machining A Shaft Grounding device is standard in Blue Max motors in frame sizes 444T and larger Insulating the motor bearings will not prevent damage to bearings of a connected load and insulated couplings should be employed to protect the load Adding a ground brush to a motor with insulated bearings will divert motor shaft currents and help protect the bearings of the connected load At this time UL policy prohibits the use of ground brushes or insulated bearings in Hazardous Locations Div 1 amp 2 Zones 1 2 21 amp 22 MOTOR GROUNDING Frames and accessories of all motors must
17. e speed Refer to the application chart found on page 14 for use of general purpose three phase motors on variable frequency drives Marathon s microMAX Black Max or Blue Max motors are not necessarily required for operation of variable torque loads A bypass circuit is often employed in Variable Torque applications If this device is intended to be used selection of a NEMA Design B motor is recommended to withstand the inrush current during across the line starting CONSTANT TORQUE LOADS Applications include conveyors elevators hoists extruders positive displacement pumps mixers and converting equipment Torque remains constant throughout the range of operation and extra care should be taken in the proper application of motors especially at very low speeds Most constant torque applications don t require operation below 10 1 i e 6 Hz operation on a 60 Hz motor but an increasing number of applications historically reserved for servo and or stepper systems are being served with motors capable of operation beyond 20 1 even up to 2000 1 zero speed constant torque Refer to the application chart found on page 14 for use of general purpose three phase motors on variable frequency drives Continued on next page C marathon 17 mm electric lt c lu A a Lu lu A N Lu _ co c lt gt lt gt a gt is m n a m m i ro a m 2 z Vari
18. ficiency levels by NEMA and the Consortium for Energy Efficiency CEE ELECTRICAL TYPE STARTING METHOD Motors in this catalog are capacitor start split phase permanent split capacitor or three phase Capacitor Start motors have high starting torque high breakdown torque and relatively low starting current Split phase motors have medium starting torque and medium starting current Permanent split capacitor motors have low starting torque and low starting current Three phase motors have high starting extra breakdown torque and typically very low starting current Single phase motors cannot be applied on variable frequency drives with three phase output ENCLOSURE AND METHOD OF COOLING Marathon Electric motors are available in various enclosures Dripproof DP Dripproof Force Ventilated DPFV Totally Enclosed Fan Cooled TEFC Totally Enclosed Non Ventilated TENV Totally Enclosed TEAO and Totally Enclosed Blower Cooled TEBC Application conditions will determine the type of motor enclosure required Dripproof motors have open enclosures and are suitable for indoor use and in relatively clean atmospheres Dripproof motors have ventilating openings constructed so that drops of liquid or solid particles falling on the machine at an angle of not greater than 15 degrees from the vertical cannot enter the machine Totally enclosed motors are suitable for use in humid environments or dusty contaminated atmospheres Totally en
19. ientation except brakemotors Contact a factory representative for shaft up mounting arrangements Marathon Electric motors employ the use of Mobil POLYREX EM grease a specially formulated bearing grease designed for electric motors POLYREX EM provides superior lubricity durability and resists corrosion rust and washout POLYREX EM is a registered trademark of Mobil Corporation Maximum safe mechanical speed capability is a function of bearing size type and grease selection as well as rotor balance specifications Consult the Maximum Safe Mechanical Speed Limits chart in the Overspeed Capability section Note that these values do not imply maximum constant horsepower RPM B300 Prices and Specifications are subject to change without notice EFFICIENCY The efficiency of a motor is the ratio of its useful power output to its total power input and is usually expressed in a percentage Marathon Electric offers standard high efficient EPAct and premium efficient XRI ratings Standard efficiency motors may only be used on applications that are exempt from EPAct The high efficient motor line is in compliance with the Energy Policy Act of 1992 EPAct and or Canadian efficiencies as set by NRCan The XRI line is a premium efficiency line which exceeds mandated efficiencies of EPAct and or NRCan Unless otherwise noted XRI premium efficient motors in this catalog meet NEMA Premium the newly promoted ef
20. ll efficiency levels 10 1 20 1 Up to 20 1 Notes 20 1 C T 60 minute duty at lowest RPM Application Notes 1 324 449T 4 amp 6 Pole XRI motors are rated for 20 1 C T with fan modification otherwise rated for 2 1 C T continuous duty or 2 Washdown TEFC motors are rated for 10 1 C T 60 minute duty or 2 1 C T continuous duty at lowest RPM Bearing currents lt gt zy gt is m n D m m i a m Fs So Z Marathon Electric recommends that any motors used with Variable Frequency Drives be equipped with suitable means to protect the motor bearings from shaft currents caused by common mode voltages inherent with operation on a non sinusoidal power supply Marathon Electric offers several options for motors in non classified non hazardous locations including ground brushes insulated bearings and non contact shaft grounding rings For more information on ground brushes and bearing currents see the VARIABLE SPEED OPERATION section For installation cost and available options see the MOD CENTRAL section Restricted use DO NOT APPLY THE FOLLOWING MOTORS ON VARIABLE FREQUENCY DRIVES Single Phase motors Motors with inherent overload protection Multi Speed motors Motors with 1 0 Service Factor on sine wave power Fire Pump motors should not be used with variable frequency power supplies due to the critical nature of these applications Hazardous Locations Consult with Marathon Ele
21. ng is achieved with higher slip NEMA Design B or C motors Locked Rotor Current LRA Steady state current taken from the line with the rotor at standstill at rated voltage and frequency This is the current when starting the motor and load across the line Locked Rotor Torque LRT The minimum torque that a motor will develop at rest for all angular positions of the rotor with rated voltage applied at rated frequency No Load Conditions The state of a machine rotating at normal speed under rated conditions but when no output is required from it Power Factor Power factor is the ratio of real power kW to total kVA or the ratio of actual power W to apparent power volt amperes Reactance The opposition to the flow of current made by an induction coil or a capacitor Performance data expresses stator reactance as X1 and rotor reactance as X2 Resistance The opposition to voltage or current in an electrical circuit Performance data expresses stator resistance as R1 and rotor resistance as R2 Rotor The rotating member of a machine with a shaft Service Factor SF When used on a motor nameplate a number which indicates how much above the nameplate rating a motor can be loaded intermittently without causing serious degradation i e a motor with 1 15 SF can produce 15 greater torque than one with 1 0 SF within temperature constraints SB300 Prices and Specifications are subject to
22. ng where the motor will develop rated HP at rated load and voltage With AC systems it is commonly the point where 60 Hz is applied to the induction motor Breakaway Torque The torque required to start a machine from standstill Breakdown Torque BDT The maximum torque that an AC motor will develop with rated voltage applied at rated frequency while rotating Cogging A condition in which a motor does not rotate smoothly but steps or jerks from one position to another during shaft revolution Cogging is most pronounced at low motor speeds and can cause objectionable vibrations in the driven machine Continuous Duty The continuous rating is the maximum constant load that can be carried continuously without exceeding established temperature rise limitations under prescribed conditions of load and within the limitations of established standards Definite Purpose Motor Any motor design listed and offered in standard ratings with standard operating characteristics and mechanical construction for use under service conditions other than usual or for use on a particular type of application NEMA Duty Cycle The relationship between the operating and resting times or repeatable operation at different loads and or speeds Efficiency Ratio of power output to power input indicated as a percentage In motors it is the effectiveness with which a motor converts electrical power into mechanical power Frequenc
23. normally closed thermostats one per phase A motor with an automatic reset protector must not be used where automatic restarting after motor cool down would endanger personnel or equipment Such applications should use a manual reset protector PHASE POWER SUPPLY Is the power supply three phase or single phase Most home and farm applications require single phase motors While most factories large commercial and industrial users require three phase motors Single phase motors can be used on three phase systems Three phase motors however cannot be operated from single phase systems Motor damage will result ROTATION Most motors in this catalog are reversible by electrical reconnection or by physical orientation Marathon Electrics standard rotation from the factory for single phase motors is counterclockwise when viewing the opposite shaft end of the motor SPEED RPM 3600 1800 and 1200 are the most common 60 HZ synchronous speeds with full load speed equivalents of 3450 1725 and 1150 e marathon om electric 13 c o U 2 l a a lt gt mz im 2 So zZ z T f Ez f z Application Information TERMINOLOGY Ambient Temperature Temperature of the medium such as air water or earth into which the heat of the equipment is dissipated Ampere AMP A measure of the rate of current through the motor Base Speed Nameplate rati
24. noted Sine wave Groups F amp G Sine wave or PWM power or PWM power Available through Marathons Mod Available through Marathons Mod Central on Explosion Proof Class Central on Explosion Proof Class Il le 160 C Ee TEO Group C amp D 1 0 S F Group F amp G 1 0 SF Contact Factory Contact Factory 1352 T4 ATEX compliant motors ATEX compliant motors Class Il Division 2 motors are not available from Marathon Electric Zone 22 groups are not defined by ATEX 12 e marathon B300 Prices and Specifications are subject to change without notice lt electric INSULATION SYSTEMS Class B General Purpose motors that employ Class B insulation systems have a total temperature rating of 130 C and maximum allowable temperature rise of 80 C at 1 0 S F Class F Motors with a Class F system have a total temperature rating of 155 C with a maximum temperature rise of 105 C at 1 0 S F Many Marathon Electric designs utilize a Class F system but limit temperature rise to no higher than B rise providing thermal headroom for longer insulation life Class H Class H insulated motors have a total temperature rating of 180 C and maximum allowable temperature rise of 125 C All Marathon Electric motors that employ a Class H system are designed to operate between B and F rise giving the user a generous thermal cushion CR200 Corona Resistant 200 rated magnet wire is utilized in numero
25. s are considered Inverter Duty and meet or exceed the requirements of NEMA MG1 Part 30 As required under Federal law these motors comply with EPAct efficiencies when operating from utility power Many of Marathon s motor product lines have been enhanced to facilitate reliable operation on today s variable speed drives including wider constant torque speed range up to 20 1 and improved insulation systems that withstand voltage spikes common with variable frequency operation Inverter Duty Rated motors are most often used in 10 1 speed range variable torque or constant torque applications A vector control is usually required for operation beyond 10 1 CT Refer to Guidelines for Application of General Purpose Single Speed Three Phase Motors on Variable Frequency Drives in this section of this catalog for the allowable speed range and cable length restrictions from VFD to motor Additional detail regarding a specific product s capabilities is available on its catalog page or by consulting your application engineer SB300 Prices and Specifications are subject to change without notice Variable Speed Operation VECTOR DUTY Vector Duty describes a class of motors that are used in conjunction with Open without encoder or Closed Loop with encoder Vector controls that provide enhanced performance under low speed operating conditions or in cases where torque rather than speed must be controlled
26. to ambient noise levels as operation above base speed will increase motor noise and vibration and reduce bearing life Under no circumstances should bearing hub temperature exceed 100 C Belted loads should not exceed 60 Hz operating RPM by more than 25 NEMA TS shafts are not suitable for belted loads Due to external cooling fans TEFC and Explosion Proof Fan Cooled motors are limited to 4000 RPM maximum speed Marathon Electric through extensive testing in our state of the art laboratory and in actual field experience has developed a number of high speed motors whose maximum safe mechanical speed exceeds the values in the table below The following table depicts maximum safe speed limits for continuous operation direct coupled non explosion proof motors and does not imply constant horsepower capability Please consult a factory representative for requirements beyond those listed or for intermittent duty limits Maximum Safe Mechanical Speed Limits ODP TENV DPFV OR TEBC ENCLOSURES 60 Hz base frequency Frame Size 2 Pole 4 6 or 8 Pole 56 184 7200 5400 213 256 5400 4200 284 286 5400 3600 324 326 4000 3600 364 365 4000 2800 404 449 3600 2800 5000 Fr N A CALL 6800 Fr N A CALL B300 Prices and Specifications are subject to change without notice Variable Speed Operation OTHER APPLICATION CONSIDERATIONS For proper selection the following should be considered Horsepower or torque requirements at various
27. ubject to change without notice VARIABLE SPEED INFORMATION Marathon Electric Vector Duty and Inverter Duty motors unless otherwise stated are rated for continuous operation in a 40 C ambient and for altitudes up to 3300 feet 1000 meters above sea level Special application considerations such as high or low ambient intermittent ratings high altitude duty cycle rated extended constant horsepower range special base speed voltage or frequency or any other special requirements should be reviewed by a factory representative It is the responsibility of the startup personnel during commissioning of the VFD motor system to properly tune the drive to the motor for the specific application The correct voltage boost and volts hertz settings are application dependent and unique to each motor design Procedures for these adjustments should be in your VFD user manual Many Vector Duty and Inverter Duty motors in this catalog are equipped with thermostats warranty coverage may be denied if they are not properly utilized AWARNING Power factor correction capacitors should never be installed between the drive and the motor INVERTER DUTY OR INVERTER RATED Inverter Duty often called Inverter Rated motors are suitable for use with Variable Frequency Drives as long as operation is within the application guidelines published in this catalog In general Marathon Electric s three phase general purpose NEMA Design B motor
28. us general purpose and inverter duty motor designs to extend insulation life under the rigors of steep fronted voltage spikes common with today s IGBT inverters Refer to page 14 for product lines that employ the use of CR200 magnet wire Motors with the CR2 insulation system can be operated at up to 475 feet from the drive on 460 volt systems at 3 KHz carrier frequency For other voltages and or carrier frequency combinations contact a factory representative MAX GUARD All Black Max Blue Max Blue Chip XRI Severe Duty and XRI 841 IEEE841 motors feature the MAX GUARD insulation system either in conjunction with Class F or Class H materials Combining corona resistant magnet wire CR2 with our patented low stress winding configuration and uncompromising quality standards MAX GUARD delivers long dependable motor life under the adverse thermal and dielectric stresses imposed by IGBT based variable frequency drives MAX GUARD surpasses the requirements of NEMA MG1 2003 Part 31 Section 4 4 2 460 Volt or lower motors equipped with MAX GUARD can be operated at any distance from the drive and at any carrier frequency 575 Volt motors can be operated at up to 650 feet cable length at 3 KHz MOUNTING Most Marathon Electric motors are designed for horizontal mounting shaft parallel with ground unless designed otherwise such as Vertical P Base motors As a general rule a horizontal motor can also be
29. y Number of cycles per second of alternating current 60HZ used primarily in the United States 50HZ normally used overseas Full Load Torque FLT The torque necessary to produce rated horsepower at full load speed General Purpose Motor This motor has a continuous duty rating and NEMAA or B design listed and offered in standard ratings with standard operating characteristics and mechanical construction for use under usual service conditions without restriction to a particular application or type of application NEMA 14 marathon electric Inertia A measure of a body s resistance to changes in velocity whether the body is at rest or moving at a constant velocity The velocity can be either linear or rotational The moment of inertia WK2 is the product of the weight W of an object and the square of the radius of gyration K2 The radius of gyration is a measure of how the mass of the object is distributed about the axis of rotation WK is usually expressed in units of lb ft Intermittent Duty A motor that never reaches equilibrium temperature but is permitted to cool down to ambient temperature between operations For example a crane hoist or machine tool motor is often rated for 15 30 or 60 minute duty Load Sharing An application condition in which two or more similar sized AC Induction motors are mechanically connected to each other and powered from the same inverter Optimum load shari
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