Installation, Operation, and Maintenance Instructions
Contents
1. 3 On VFD driven loads program skip frequencies to bypass resonant points 4 Increase carrier frequency to obtain lt 3 THD current 5 On variable torque loads reduce volts hertz below base speed E VFD torque pulsations 1 Adjust VFD to obtain lt 3 THD current rated motor current 2 Adjust VFD j que p stability for smooth operation Vector drives may be unstable at light load Motor miswired at terminal box Match motor lead wiring to nameplate connection diagram Uneven weak or loose mounting support Shim strengthen or tighten where required Test motor by itself If bearings are bad you will hear noise or feel roughness Roller bearings are normally noisy when operated without load If sleeve bearing H Motor bearings defective add oil per nameplate instructions For motors with regreasing provisions add grease per relubricating instructions see section 4 2 3 If noise persists contact warranty service Disconnect from load Set motor on rubber pads on solid floor Secure a height key in shaft keyway and energize from balanced power supply rated voltage Record vibration levels and compare with appropriate standards If excessive vibration persists contact motor manufacturer I Motor out of balance earings repeatedly fail a 1 If belt drive check system per section 3 3 4 2 Other than belting check A Load to motor may be excessive or unbalanced loading on motor shaft An unbalanced load will also2. 4 2 5 EXAMPLE LUBRICATION Assume NEMA 286T IEC 180 1750 RPM Vertical motor driving an exhaust fan in an ambient temperature of 43 C and the atmosphere is moderately corrosive 1 Table 4 1 list 10 000 hours for standard conditions 2 Table 4 2 classifies severity of service as Severe with a multiplier of 0 5 3 Table 4 3 lists a multiplier value of 0 5 for Vertical 4 Eq 4 2 Interval 10 000 hrs x 0 5 x 0 5 2500 hrs Table 4 4 shows that 1 5 in of grease is to be added Relubricate every 2 500 hrs of service with 1 5 in of recommended grease 4 3 TROUBLE SHOOTING A WARNING READ INSTRUCTIONS Before trouble shooting a motor carefully read and fully understand the warnings cautions amp safety notice statements in this manual WARNING Hazardous Locations Motor Repair Motors nameplated for use in Division 1 Hazardous Locations can only be disassembled modified or repaired by the plant of manufacturer or a facility that is Listed under UL s category Motors and Generators Rebuilt for use in Hazardous Locations Failure to follow these instructions could result in serious personal injury death and or property damage CAUTION DISASSEMBLY APPROVAL REQUIRED Motor disassembly must be performed by a party approved by the motor manufacturer To disassemble the motor without approval voids the warranty 4 3 1 GENERAL TROUBLE SHOOTING WARNINGS 1 DISCONNECT POWER TO THE MOTOR BEFORE PERFORMING SE
3. Failure to follow this warning could result in serious personal injury death and or property damage 3 4 ELECTRICAL CONNECTIONS WARNING ELECTRICAL HAZARDS Before proceeding read Section 1 1 on Electrical Safety Failure to follow the instructions in Section 1 1 could result in serious personal injury death and or property damage 3 4 1 POWER SUPPLY BRANCH CIRCUIT A WARNING POWER SUPPLY INCOMPATIBILITY HAZARD Check power supply to make certain that voltage frequency and current carrying capacity are in accordance with the motor nameplate Failure to match motor nameplate values could result in serious personal injury death and or property damage WARNING BRANCH CIRCUIT SUPPLY HAZARD Motor and control wiring fusing overload protection disconnects accessories and grounding must always conform to the applicable electrical codes as well as local codes and sound practices 3 4 1 1 Branch Circuit Supply to a motor should include a disconnect switch short circuit current fuse or breaker protection motor starter controller and correctly sized thermal elements or overload relay protection 3 4 1 2 Fuses Breakers Overload Relays Short Circuit Current Fuses or Breakers are for the protection of the branch circuit Starter or motor controller overload relays are for the protection of the motor Each of these should be properly sized and installed per the applicable electrical codes as well as local codes and practices WARNIN
4. and various Power Transmission Manufacturers catalogs 5 These selections are for Narrow V belt sections only Consult manufacturer for details on conventional V belt sections A B C D and E or other belt types 6 Average Deflected Force is per section 3 3 4 4 of this document and is the force required to deflect the center of a belt 1 64 of the belt span distance Tolerance on this force is 1 Ibf for forces lt 10 Ibs and 2 Ibs for forces gt 10 lbs as measured utilizing a belt tension gage 7 When more than one belt is required the belts must be a matched set matched for length 8 If possible the lower side of the belt should be the driving side to increase the length of wrap on the sheave 9 For belted loads do not exceed 125 of 60 Hz operating RPM 3 3 5 1 Overspeed Capability Belted loads Do not exceed 125 of 60 Hz operating RPM Table 3 4 Maximum Safe Continuous Speed RPM For Coupled and Direct Connected Loads NEMA IEC 2 Pole 4 6 or 8 Frame Size Pole 56 180 80 110 7200 5400 210 250 130 160 5400 4200 280 180 5400 3600 320 200 4500 3600 360 225 4500 2700 400 440 250 280 3600 2700 gt 440 gt 280 3600 1800 Fan cooled motors Totally Enclosed amp Hazardous Locations Motors are limited to a maximum safe continuous speed of 4000 RPM For higher speeds or shortened duty cycle contact motor manufacturer 3 3 5 2 Cable Lengths For optimum ins
5. cause the bearings to fail 3 Check runouts of mating components such as a C face and pump flange B Bearings contaminated Motor enclosure not suitable for environment Replace with correct enclosure g construction Incorrect grease or bearings for ambient extremes See section 4 2 1 D VED bearing damage Ground brush common mode filter or insulated bearings must be added Contact ing g motor manufacturer otor at start up makes a loud rubbing grinding or squealing noise Belt squeal during across the line starting is normal 1 Verify that supply voltage is within limits see section 3 4 1 3 2 Ensure that motor lead wiring matches A Contact between rotating and stationary components nameplate connection diagram 3 Isolate motor from load 4 To locate point of contact turn motor shaft by hand 5 If point of contact is not located contact motor service shop 9 tart capacitors repeatedly fail Motor may be too small for load Record acceleration time Start capacitors may he motor acceleration time is too lon Pat A 9 fail if acceleration time exceeds 3 seconds Excessive starting will damage motor capacitors Contact motor manufacturer if B Motor is being started too frequently motor is started more than 20 times hour or if acceleration time exceeds 3 seconds el D Defective start switch inside motor Motor voltage low Verify that voltage at the motor terminals is within l
6. location Avoid locations with large temperature swings that will result in condensation Motors must be covered to eliminate airborne dust and dirt If the storage location exhibits high vibration place isolation pads under motor to minimize damage to motor bearings 2 3 1 BEARING LUBRICATION Bearings are grease packed at the factory relubrication upon receipt of motor or while in storage is not necessary If stored more than one year add grease per lubrication instructions Table 4 4 before start up 2 3 2 SHAFT ROTATION It is recommended that the motor shaft be rotated 5 to 10 rotations every three months to distribute the grease in the bearings This will reduce the chance for corrosion to form on the bearing rolling elements and raceways Note Shaft seals and bearing seals may add drag 2 3 3 DAMP OR HUMID STORAGE LOCATIONS Treat unpainted flanges shafts and fittings with a rust inhibitor Apply appropriate power to the motor s space heaters if so equipped 3 0 INSTALLATION AND OPERATION A WARNING Only qualified personnel who are familiar with the appropriate national code local codes and sound practices should install or repair electrical motors and their accessories Installation should conform to the appropriate national code as well as local codes and sound practices Failure to follow these instructions could result in serious personal injury death and or property damage WARNING ELECTRICAL LIVE CIRCUIT HAZARD D
7. motor surface temperatures may exceed 90 C 194 F Touching the motor frame may cause discomfort or injury Surface temperatures should only be measured with suitable instruments and not estimated by hand touch 3 4 5 1 Start Up No Load Procedure 1 Check Instructions Before startup carefully read and fully understand these instructions including all warnings cautions and safety notice statements 2 Motor out of storage after more than three months Check winding insulation integrity with a Megger If winding resistance to ground is less than 1 5 Meg ohms consult the local authorized service shop before energizing the motor 3 Check Installation Mechanical Check tightness of all bolts and nuts Manually rotate the motor shaft to ensure motor shaft rotates freely Note Shaft amp bearing seals will add drag Electrical Inspect all electrical connections for proper terminations clearance mechanical tightness and electrical continuity Be sure to verify connections are made per the nameplate connection diagram or separate connection plate Replace all panels and covers that were removed during installation before energizing the motor 4 Energize Motor Check Rotation If practical check motor rotation before coupling to the load Unlock the electrical system Momentarily provide power to motor to verify direction of rotation If opposite rotation is required lock out power before reconnecting motor If motor has a rotatio
8. the terminal housing and must be used as the primary grounding connection Secondary External Ground Some motors are provided with a supplemental grounding terminal located on the external surface of the motor frame or feet This external terminal is for supplemental bonding connections where local codes permit or require such connection 3 4 5 START UP A WARNING ELECTRICAL SHOCK HAZARD Be certain that all connections are secure and the conduit box cover is fastened in place before electrical power is connected Failure to follow these instructions could result in serious personal injury death and or property damage WARNING LOOSE amp ROTATING PARTS HAZARD Before proceeding read Section 1 2 on Mechanical Safety Failure to follow the instructions in Section 1 2 could result in serious personal injury death and or property damage WARNING EXCESSIVE SURFACE TEMPERATURE HAZARD Motors with the temperature code stated on the nameplate are designed to operate within this limit Improper application or operation can cause the maximum surface temperature to be exceeded A motor operated in a Hazardous Location that exceeds this surface temperature limit increases the potential of igniting hazardous materials For conditions that increase surface temperature see motor manufacturer s web sit Failure to follow these instructions could result in serious personal injury death and or property damage CAUTION HOT SURFACE Normal
9. 000 Hrs 4000 Hrs 10000 Hrs 14000 Hrs 320 200 2000 Hrs 3000 Hrs 9000 Hrs 12000 Hrs 360 225 1500 Hrs 2000 Hrs 8000 Hrs 10000 Hrs 400 440 250 280 1500 Hrs 4000 Hrs 7000 Hrs gt 440 gt 280 Seasonal Service If motor remains idle for more than six months Lubricate at the beginning of the season then follow lubrication interval Do not exceed maximum safe operating speed Table 3 4 without manufacturer s approval 1000 Hrs 3000 Hrs 5000 Hrs Table 4 2 Service Conditions Use highest level Multiplier Maximum Ambient Temperature and Contamination are independent factors Severity of Maximum Ambient 5 ere ae Atmospheric Contamination Multiplier Service Temperature p p Standard Less than 40 C 104 F Clean Slight Corrosion indoors less than 16 hrs per day 1 0 Above 40 C 104 F to 50 Moderate dirt or Corrosion or outdoors or more than 16 hrs Severe C per day 0 5 Extreme Greater tat e a Severe dirt or Abrasive dust or Corrosion 0 2 Class H Insulation Table 4 3 Construction Multiplier Construction Multiplier Angular Contact or Roller Bearing 0 5 Vertical Motor 0 5 All others 1 0 Table 4 4 Relubrication Amounts Frame Size Volume NEMA IEC Cu In Fluid oz ml 140 90 0 25 0 14 4 0 180 110 0 50 0 28 8 0 210 130 0 75 0 42 12 5 250 1
10. 60 1 00 0 55 16 0 280 180 1 50 0 83 25 0 320 200 2 00 1 11 33 0 360 225 3 00 1 66 50 0 400 250 3 80 2 11 62 0 440 280 4 10 2 27 67 0 gt 440 gt 280 4 50 2 50 74 0 For regreasing while operating multiply volume by 125 4 2 4 LUBRICATION PROCEDURE For Motors with Regreasing Provisions Added grease must be compatible with the original equipment s grease If a grease other than those stated in 4 2 1 is to be utilized contact the motor manufacturer Nameplate information supersedes section 4 2 1 GREASE TYPE New grease must be free of dirt Failure to follow these instructions and procedure below may result in bearing and or motor damage For an extremely dirty environment contact the motor manufacturer for additional information LUBRICATION PROCEDURE 1 Clean the grease inlet plug or zerk fittings prior to regreasing 2 If present Remove grease drain plug and clear outlet hole blockage CAUTION GREASE DRAIN PLUGGED Old grease may completely block the drain opening and must be mechanically removed prior to regreasing Forcing a blocked drain open by increased greasing pressure may collapse bearing shields and or force excess grease through the bearings and into the motor 3 Add grease per Table 4 4 4 Re install grease inlet and drain plugs if removed A WARNING EXPLOSION HAZARD Do NOT energize a Hazardous Locations motor without all grease fittings properly installed
11. Boxes mounted to motor with a pipe nipple If a pipe nipple mounted terminal box is removed or rotated it must be reassembled with a minimum of five full threads of engagement 2 Component Removal Do not set a terminal box component on its machined surfaces Prior to component reassembly wipe clean all machined surfaces 3 Machined Surface Gap Hazardous Locations Terminal Boxes The gap between mating surfaces with the machined terminal box MUST BE LESS THAN 0 002 inches This gap must be checked with a feeler gage along the entire perimeter If there is visible damage to the mating surfaces or if the gap between these surfaces exceeds 0 002 inches DO NOT complete the installation and contact the motor manufacturer Failure to follow these instructions could result in serious personal injury death and or property damage 3 4 3 LEAD CONNECTIONS Electrical connections to be made per nameplate connection diagram or separate connection plate In making connections follow the applicable electrical code as well as local codes and practices WARNING ELECTRICAL CONNECTION HAZARD Failure to correctly connect the motor leads and grounding conductor can result in injury or death Motor lead connections can short and cause damage or injury if not well secured and insulated 3 4 3 1 Wire Size Single Phase Requirements The minimum wire size for Single Phase 115 amp 230 Volt Circuits must meet table 3 8 for a given distance between motor and e
12. DOUS LOCATIONS AMBIENT LIMIT Division 1 Hazardous Locations motors shall NOT be operated below 25 C 13 F ambient Low temperatures reduce the component mechanical properties 3 1 3 CONSTRUCTION SELECTION per LOCATION 3 1 3 1 DRIPPROOF OPEN MOTORS are intended for use indoors where the atmosphere is relatively clean dry and non corrosive Recommended a minimum clearance of the shaft height between vent openings and the nearest obstruction 3 1 3 2 TOTALLY ENCLOSED MOTORS are suitable for indoor or outdoor standard service applications TEAO or AOM Totally Enclosed Air Over motors must be mounted in the air stream When the motor nameplate states a minimum airflow the motor must be mounted in an air stream meeting this minimum value TEFC Totally Enclosed Fan Cooled motors must meet a minimum distance of 72 the shaft height between the fan guard grill openings and the nearest obstruction 3 1 3 3 HAZARDOUS LOCATIONS MOTORS Hazardous Locations motors are intended for installations in accordance with NEC Article 500 For all installations involving Hazardous Locations motors consult the applicable national codes local codes and the authority having jurisdiction Division 1 Installations includes Class amp ll Use only motors that are UL Listed and CSA Certified or UL Listed and UL Certified for Canada These motors bear a separate nameplate that includes the UL Listing Mark and CSA Certification Mark or include
13. G PROTECTIVE DEVICE DISABLED HAZARD DO NOT bypass or disable protective devices Protection removal could result in serious personal injury death and or property damage 3 4 1 3 AC Power Supply Limits Motors are designed to operate within the following limits at the motor terminals 1 AC power is within 10 of rated voltage with rated frequency applied Verify with nameplate ratings OR 2 AC power is within 5 of rated frequency with rated voltage OR 3 A combined variation in voltage and frequency of 10 sum of absolute values of rated values provided the frequency variation does not exceed 5 of rated frequency 4 For 3 phase motors the line to line full load voltage must be balanced within 1 5 Ifthe motor is rated 208 230V the voltage deviations must be calculated from 230V CAUTION Reduced Motor Performance Operation outside of these limits will degrade motor performance and increase operating temperature 3 4 2 TERMINAL BOX 3 4 2 1 Conduit Opening For ease of connections motors are typically provided with large terminal boxes Most motors have conduit access in 90 degree increments the terminal box conduit opening is typically provided via knockouts holes with covers or the terminal box is rotate able Fabricated conduit boxes may have a removable plate for the installer to provide correctly sized hole s 3 4 2 2 Hazardous Locations Motors WARNING EXPLOSION HAZARDS 1 Terminal
14. Installation Operation and Maintenance Instructions for Industrial AC Induction Motors 140 6800 Frames NEMA 90 280 Frames IEC Regal Beloit AC Motors LEESON ELECTRIC Contact Motor Customer Service at LEESON ELECTRIC 262 377 8810 Parts Dept 262 377 8810 Warranty Service 800 558 5490 GERO OES ARD DR JES LEESON CANADA 905 670 4770 www Leeson com LINCOLN MOTORS Contact Motor Customer Service at T m LINCOLN MOTORS 800 668 6748 MCO I Parts Dept 216 731 4790 MOTORS Warranty Service 800 254 4207 www Lincolnmotors com MARATHON ELECTRIC Contact Motor Customer Service at MARATHON ELECTRIC 800 284 6362 Parts Dept 800 284 6362 6 MARATHON Warranty Service 800 254 4207 port leer tl ae www marathonelectric com INSTALLER PLEASE LEAVE THIS MANUAL FOR THE OWNER S USE OWNER READ AND SAVE THESE INSTRUCTIONS SAFETY INSTRUCTIONS A This is the safety alert symbol It is used to alert you to potential personal injury hazards Obey all safety messages that follow this symbol to avoid possible injury or death A WARNING Before installing using or servicing this product carefully read and fully understand the instructions including all warnings cautions amp safety notice statements To reduce risk of personal injury death and or property damage follow all instructions for proper motor installation operation and maintenance These instructions are not intended
15. RVICE OR MAINTENANCE 2 Discharge all capacitors before servicing motor 3 Always keep hands and clothing away from moving parts 4 Be sure required safety guards are in place before starting equipment 5 If the problem persists contact the manufacturer Table 4 5 Motor Trouble shooting Chart Issue Likely Cause Corrective Action Motor fails to start upon initial installation A Supply voltage is too low or is severely unbalanced one 1 Check power supply fuses 2 Match motor lead wiring to nameplate connection phase is low or missing diagram and supply voltage 3 Ensure that steady state supply voltage at motor terminals is within limits see section 3 4 1 3 Correct as needed 4 Obtain correct 1 Verify that motor amp load turn freely 2 Disconnect motor from load amp ensure C Driven load exceeds motor capacity motor turns freely Note Roller bearings make noise when motor is uncoupled and shaft is rotated 3 Verify that motor starts when disconnected from load 4 Load is jammed Remove excessive binding load if present VFD with power factor capacitors installed Remove power factor correction capacitors if equipped VFD with motor neutral lead grounded Ensure that motor neutral lead is ungrounded 1 Repeat checks listed above 2 Verify that VFD current limit and starting boost are set correctly 5 Double check motor and feedback parameter settings and VFD permissives 6 Repeat autotune for vect
16. as a complete listing of all details for installation operation and maintenance If you have any questions concerning any of the procedures STOP and call the appropriate Regal Beloit motor company Table of Contents 1 0 INSTALLER OWNER OPERATOR RESPONSIBILITY 1 1 Electrical Safety 1 2 Mechanical Safety 1 3 Environmental Safety 2 0 RECEIVING amp INSPECTION 2 1 Initial Inspection 2 1 1 Packing List amp Inspect 2 1 2 Turn Motor Shaft 2 1 3 Check Nameplate 2 2 Handling 2 2 1 Correct Lifting Angles 2 3 Storage 2 3 1 Bearing Lubrication 2 3 2 Shaft Rotation 2 3 3 Damp or Humid Storage Locations 3 0 INSTALLATION AND OPERATION 3 1 Location 3 1 1 Selecting a Location 3 1 2 Ambient Temperature Limits 3 1 3 Construction Selection per Location 3 1 3 1 Dripproof 3 1 3 2 Totally Enclosed 3 1 3 3 Hazardous Locations Motors 3 2 Mounting Motor 3 2 1 Rigid Base Footed 3 2 2 Rigid Base Hole Selection 6 or 8 Hole Bases 3 2 3 Vertical 3 3 Application Assembly to Motor 3 3 1 General Proper Alignment 3 3 2 Direct Coupling 3 3 3 Direct Connected 3 3 4 Belted 3 3 5 VFD Operation 3 3 6 Accessories 3 3 6 1 General 3 3 6 2 Brake Motors 3 3 6 3 Space Heaters 3 3 6 4 Thermal Protection General Thermostats Thermisters amp RTDs 3 3 6 5 RTD Alarm amp Trip Settings 3 3 7 Guards 3 4 Electrical Connections 3 4 1 Power Supply Branch Circuit 3 4 1 1 Branch Circuit Supply 3 4 1 2 Fuses Breakers Overload Relays 3 4 1 3 AC Power Sup
17. be flat within 0 01 inches for 210 frame amp smaller 0 015 inches for 250 frame amp larger IEC 0 25 mm for 130 frame amp smaller 0 38 mm for 160 frame amp larger This may be accomplished by shims under the motor feet For special isolation mounting contact manufacturer for assistance 3 2 2 RIGID BASE HOLE SELECTION 6 OR 8 HOLES Location 1 and 3 holes for short frames NEMA 162 213 254 284 324 T K 364 404 444 447 IEC 112S 1325 160M 180M 200M 2258 2508 2808 Bottom View Of Motor Location 2 holes are for F1 F2 Conversions if provided O Location 1 and 4 holes for long frames NEMA 184 215 256 286 326 365 405 445 449 IEC 112M 132M 160L 180L 200L 225M 250M 280M 3 2 3 VERTICAL MOUNTING CAUTION ENCLOSURE PROTECTION CAUTION Most Dripproof rigid base footed motors do NOT meet Dripproof requirements when mounted vertically If the motor is located in unprotected environments the addition of a drip cover may be available Drip covers not available for cast iron rigid base motors WARNING FALLING OBJECT HAZARD The lifting provision on standard horizontal footed motors is not designed for lifting the motor in a vertical shaft up or shaft down position see 2 2 1 lifting angles Lifting method provisions for mounting a rigid base footed motor vertically is the responsibility of the installer VERTICAL SHAFT DOWN Most standard horiz
18. cturer for additional information 3 3 6 2 Brake Motors CAUTION Vertical Motor Premature Brake Failure Motors with brakes that are designed for vertical applications are equipped with springs to support the brake pressure plate Mounting a horizontal brake motor vertically shaft up or down may require a pressure plate spring modification Failure to modify the brake for the vertical application may result in premature brake failure If in question consult brake literature or brake manufacturer Brake Solenoid Wiring Do NOT connect the brake solenoid to the output of a VFD The brake solenoids must be wired to 50 60 Hz line power 3 3 6 3 Space Heaters Motors provided with space heaters have two leads that are brought into the conduit box or into an auxiliary box These leads are marked H1 H2 H3 H4 if a second space heater is supplied See the space heater nameplate on motor for heater rating A WARNING DIVISION 2 EXPLOSION HAZARD The space heater temperature rating when used in Class Division 2 motors shall NOT exceed 80 of the auto ignition temperature of the hazardous gas or vapor See the space heater nameplate on motor for heater Temperature Code and heater rating Failure to follow this instruction could result in serious personal injury death and or property damage 3 3 6 4 Thermal Protection General Information When thermal protection is provided one of the following will be stamped on
19. d by measuring the force required to deflect the center of the belt a given distance The proper deflection in inches is determined by dividing the belt span in inches by 64 See figure 3 Calculate the proper deflection and then see Table 3 3 for the required Deflected Force to achieve that deflection After tensioning the belt rotate the sheaves for several rotations or operate the system for a few minutes to seat belts into the grooves then re tension the belts New belts will stretch during use and should be retensioned after the first eight hours of use Figure 3 Belt Span Center Deflected Force Table 3 3 3 3 5 VFD Variable Frequency Drives OPERATION WARNING VFD Motors with Reset Thermal Protectors UL Recognition UL Listing or CSA certification does not apply to motors that are equipped with a manual or automatic reset thermal protector when the motor is operated on VFD power WARNING Power Factor Correction Capacitors Power factor correction capacitors should never be installed between the drive and the motor A CAUTION VFD Motor Setup It is the responsibility of the startup personnel during set up of the VFD motor system to properly tune the drive to the motor for the specific application per the VFD user manual The correct voltage boost and volts per hertz settings are application dependent and unique to each motor design Failure to connect over temperature devices when provided w
20. e winding insulation has been maintained Record the Megger readings If winding resistance to ground is less than 1 5 Meg ohms consult the local authorized service shop before re energizing the motor 4 1 3 ELECTRICAL CONNECTIONS Check all electrical connectors to be sure that they are tight 4 2 LUBRICATION amp BEARINGS The lubricating ability of grease over time depends primarily on the type of grease the size of the bearing the speed at which the bearing operates and the severity of the operating conditions Longer bearing life can be obtained if the listed recommendations are followed NOTE If lubrication instructions are provided on the motor nameplate the nameplate instructions will supersede these instructions Motors marked Permanently Lubricated do not require additional service CAUTION BEARING MOTOR DAMAGE WARNING Lubricant should be added at a steady moderate pressure If added under heavy pressure bearing shield s may collapse Over greasing bearings greatly increases bearing friction and can cause premature bearing and or motor failure 4 2 1 GREASE TYPE unless nameplate states otherwise Nameplate Ambient Temperature between 30 C 22 F to 65 C 150 F inclusive Recommended grease for standard service conditions is Polyrex EM Exxon Mobil Equivalent and compatible greases include Texaco Polystar RB Rykon Premium 2 Pennzoil Pen 2 Lube Chevron SRI amp Mobil SHC 100 Nameplate Ambie
21. ewelry and clothing away from moving parts Failure to follow these instructions could result in serious personal injury death and or property damage 1 3 ENVIRONMENTAL SAFETY A WARNING HAZARDOUS LOCATIONS 1 The NEC and the local authority having jurisdiction must be consulted concerning the installation and suitability of motors for use in Hazardous Locations The local authority having jurisdiction must make the final determination of what type of motor is required The application and operation is beyond the control of the motor manufacturer Division 1 Hazardous Locations motors can only be modified or reworked by the manufacturer or a facility that is Listed under UL s category Motors and Generators Rebuilt for use in Hazardous Locations Failure to follow these instructions could result in serious personal injury death and or property damage Do not use a Hazardous Locations motor with a Variable Frequency Drive VFD unless the motor nameplate specifically states that the motor is suitable for use on Pulse Width Modulated PWM type VFD power In addition the nameplate must be marked with the inverter rating for example 2 1 CT 2 to 1 Constant Torque etc 2 YS 3 lt 2 0 RECEIVING AND INSPECTION 2 1 INITIAL INSPECTIONS 2 1 1 CHECK PACKING LIST AND INSPECT the packaging to make certain no damage has occurred in shipment If there is visible damage to the packaging unpack and inspect the
22. ill void the warranty Table 3 3 Recommended Minimum Sheave Diameters Belt Type Number of Belts and Deflected Force Min Sheave Type Belts Ibs 7E 3VX ba o 3VX 29 1 Zeo ea 68 8 2 16 5 17 5 18 1 1 5 2 3 5 7 5 10 15 20 25 30 40 50 8 2 10 0 _ 200 250 300 350 400 450 N Rolo Sal ahah olla DO ESS aaan ww Oo Go jj ZISIZSISISISISISISISIS SiSis bedbeabedbedbedbedbed xfj S colcolcolcolenten fen aeea wlll SISISISISISIS SISISISISIS oO oO 100 100 125 12 0 150 13 2 WIN NO on 15 0 _ oa oO Max Avg Min Deflected Sheave Dia in Belt of Force Dia in 1800 rpm 3600 rpm Max Avg Min Max Avg Deflected Sheave Deflected of Force Dia in Belt of Force Belts Ibs Type Belts an a e own o ee eo e O OEY wle e wo wo a w A w wo 60 13 3 13 25 7 7 7 4 4 7 1 1 1 7 200 250 300 11 7 350 16 5 400 17 5 29 1 13 8 257 450 18 8v 8V 600 aaa o Notes 1 Horsepower is the nameplate motor horsepower and RPM is the motor driver speed 2 Minimum sheave diameters are from NEMA standards where applicable 3 For variable speed applications or values outside these recommendations consult motor manufacturer 4 Selections are based on a 1 4 service factor 5 to 1 speed ratio
23. imits see section 3 4 1 3 Motor internal switch failure overheats start capacitor Contact service shop or motor manufacturer n capacitor fails High ambient temperature Verify that the ambient does not exceed motor s nameplate value Input voltage exceeds limit Verify that voltage to the motor terminals is within limits see section 3 4 1 3 Power surge to motor caused by lightning strike or other O high transient voltage If a common problem install surge protector EENE ee
24. ither Fuse or Meter Box 3 4 3 2 Extension Cords Single Phase Motors Where an extension cord s is utilized to provide power to the motor the extension cord s must be 1 the proper gauge size per table 3 8 2 in good working condition 3 properly grounded Table 3 8 Minimum Wire Size Single Phase 115 amp 230 Volt Circuits Distance Feet Motor to Fuse or Meter Box L115 230 115 230 8 10 6 8 4 8 6 8 4 6 10 2 6 8 4 6 4 0 0 8 6 4 2 e we a4 2 3 lef J 4 2 ee ee 3 4 4 GROUND CONNECTION S A WARNING ELECTRICAL GROUNDING HAZARD For general information on grounding USA refer to NEC Article 250 Improper grounding of an inverter fed motor may result in frame voltages in excess of 500 Volts In making the ground connection the installer must make certain that a good electrical connection is obtained between motor and grounding lead Failure to properly ground motors per the applicable national code such as NEC Article 430 and local codes may cause serious injury or death to personnel Primary Internal Ground A grounding conductor must be connected to the grounding terminal provided in the terminal housing This grounding terminal is either a ground screw ground lug or a tapped hole to be used with a separately provided ground screw The internal grounding feature is accessible inside
25. motor immediately Claims for any damage done in shipment must be made by the purchaser against the transportation company 2 1 2 TURN MOTOR SHAFT by hand to be certain that it rotates freely Note Shaft seals and bearing seals may add drag 2 1 3 CHECK NAMEPLATE for conformance with purchase order requirements and compliance with power supply and control equipment requirements 2 2 HANDLING WARNING FALLING OBJECT HAZARD Eyebolts or lifting lugs where provided are intended for lifting only the motor and accessories mounted by the motor manufacturer unless specifically stated otherwise on the motor Utilizing the motor lifting provision to lift other components such as pumps and gear boxes could result in serious personal injury death and or property damage A WARNING FALLING OBJECT HAZARD Before using the lifting provision check the eyebolts and or other lifting means to assure they are not bent or damaged and are completely threaded seated amp secured to the motor Equipment to lift motor must have adequate lifting capacity While lifting the motor DO NOT stand under or in the vicinity of the motor Failure to follow these instructions could result in serious personal injury death and or property damage 2 2 1 LIFTING ANGLE LIMITATIONS 30 DEGREE MAX ANGLE SINGLE LIFTING DEVICE TYPICAL MULTIPLE LIFTING DEVICES TYPICAL 2 3 STORAGE Motors not put into service immediately must be stored indoors in a clean dry
26. nal arrow only operate the motor in the rotation identified Reapply power to ensure proper operation 5 Record No Load Amps Watts amp Voltage Recommend To establish a baseline value check and record the no load amps watts and voltage 3 4 5 2 Start Up Load Connected Procedure 1 Check Instructions Before startup carefully read and fully understand these instructions including all warnings cautions amp safety notice statements 2 Coupling Installation Check that the connected equipment is properly aligned and not binding Check that all guards and protective devices are properly installed 3 Energize Motor When all personnel are clear of the machine apply power and verify that the load is not transmitting excessive vibration back to the motor though the shaft or the foundation Verify that motor amps are within nameplate rating For repeated starts see 3 4 5 3 The equipment can now be fully loaded and operated within specified limits as stated on the nameplate 3 4 5 3 Jogging and or Repeated Starts Do not start more than twice in succession under full load Repeated starts and or jogs of induction motors can cause overheating and immediate failure Contact the motor manufacturer if it is necessary to repeatedly start or jog the motor 4 0 MAINTENANCE A WARNING Hazardous Locations Motor Repair HAZARD Division 1 Hazardous Locations motors can only be modified or repaired by the manufacturer or a facility that i
27. nt Temperature below 30 C 22 F Special low temperature grease is recommended such as Aeroshell 7 or Beacon 325 for ball bearings and Mobil SHC 100 for roller bearings Nameplate Ambient Temperature above 65 C 150 F Dow Corning DC44 or equivalent a special high temperature grease is required Note that Dow Corning DC44 grease does not mix with other grease types 4 2 2 BEARING OPERATING TEMPERATURE A CAUTION HOT SURFACE The external surface temperature of the end shield bracket bearing hub may reach 100 C 212 F during normal operation Touching this surface may cause discomfort or injury Surface temperatures should only be measured with suitable instruments and not estimated by hand touch For RTD settings see Table 3 7 4 2 3 LUBRICATION INTERVALS For motors with regreasing provisions Eq 4 2 Lubrication Interval Table 4 1 hrs x Interval Multiplier Table 4 2 x Construction Multiplier Table 4 3 Recommended lubrication intervals are shown in Table 4 1 These values are based on average use NEMA IEC Frame Size Table 4 1 Lubrication Intervals Operating Speed RPM See Table 3 4 for Maximum Operating Speed lt 7200 lt 5400 lt 4500 lt 3600 lt 1800 lt 1200 56 180 80 110 2500 Hrs 4000 Hrs 5000 Hrs 6000 Hrs 17000 Hrs 20000 Hrs 210 250 130 160 2500 Hrs 4000 Hrs 5000 Hrs 12000 Hrs 16000 Hrs 280 180 2000 Hrs 3
28. nto the control portion of a manual reset start circuit Failure to follow this instruction could result in serious personal injury death and or property damage Resistance Temperature Detectors RTD When winding and or bearing RTDs are provided the RTD lead markings are defined on the nameplate Normally R1 R2 R3 etc 3 3 6 5 RTD Alarm amp Trip Settings Tables 3 6 amp 3 7 are suggested initial RTD alarm and trip settings For motors found to operate significantly below these values the settings may be reduced accordingly Table 3 6 Winding RTD Temperature Limit C 40 C Max Ambient Class B Tem Class F Tem Motor Load Rise lt 80 C Rise lt 105 C Trip Up to 1 0 SF 165 gt 1 0 to 1 15 SF 165 Table 3 7 Bearing RTD Temperature Limit C 40 C Max Ambient Ambient Up to 40 C gt 40 C Bearings that are Heat Stabilized to 130 135 150 C 3 3 7 GUARDS WARNING ROTATING PARTS HAZARD When devices are assembled to the motor shaft be sure to install protective devices such as belt guards chain guards and shaft covers These devices must protect against accidental contact with extremities hair and clothing Consider the application and provide guarding to protect personnel Remove all unused shaft keys and loose rotating parts to prevent them from flying off and causing bodily injury
29. o not touch electrically live parts Disconnect Lockout and Tag input power supply before installing or servicing motor includes accessory devices Use a voltmeter to verify that power is off before contacting conductors 3 1 LOCATION 3 1 1 SELECTING A LOCATION Consideration should be given to environment and ventilation Motors should be installed in an area that is protected from direct sunlight corrosives harmful gases or liquids dust metallic particles and vibration A motor with the proper enclosure for the expected operating condition should be selected Provide accessible clearance for cleaning repair service and inspections See section 3 1 3 for construction clearances The location should be considered for possible future motor removal handling The free flow of air around the motor should not be obstructed 3 1 2 AMBIENT TEMPERATURE LIMITS The ambient temperatures of the air inlet to the motor should not exceed 40 C 104 F or be less than 30 C 22 F unless the motor nameplate specifically states an ambient temperature outside of these limits The ambient inside an enclosure built around the motor shall not exceed the nameplate ambient For ambient temperatures outside of these limits consult the motor manufacturer A CAUTION INSULATION DEGRADATION WARNING Insulation at high temperatures ages at an accelerated rate Each 10 C increase in temperature reduces the insulation life by one half WARNING HAZAR
30. ontal motors thru 449 Fr excluding brake motors can be mounted in a vertical shaft down orientation For vertical brake motors see section 3 3 6 2 VERTICAL SHAFT UP WARNING HAZARDOUS LOCATIONS VERTICAL MOUNT Hazardous locations motors must NOT be mounted vertically shaft up without approval by the motor manufacturer Without proper retaining provisions the rotor may move axially and contact components creating a spark hazard Belted or Radial Load when mounted vertically For acceptable loads per frame size see Table 3 1 on motor manufacturer s web site listed on page 2 3 3 APPLICATION ASSEMBLY TO MOTOR A CAUTION EQUIPMENT DAMAGE Do not connect or couple motor to load until correct rotational direction is established 3 3 1 GENERAL PROPER ALIGNMENT of the motor and driven equipment minimizes vibration levels maximizes bearing life and extends the overall life of the machinery Consult the drive or equipment manufacturer for more information CAUTION BEARING FAILURE During assembly do NOT force components onto the shaft Striking or hammering the component may result in bearing damage 3 3 2 DIRECT COUPLING Use flexible couplings if possible For applications that apply radial axial or moment loading on the motor shaft see section 3 3 3 A CAUTION BEARING FAILURE Unless approved by the motor manufacturer do NOT direct couple a vertical shaft up or roller bearing motor Direct coupling a vertical shaft up mo
31. or drives procedure 7 Consult VFD supplier otor has been running then slow down stalls or fails to restart Q VFD programmed incorrectly 1 Replace fuse or reset circuit breaker Allow motor to cool down before resetting manual protector on motor Warnings See section 1 1 for automatic and manual reset protector warnings 2 Verify that rated and balanced supply voltage has been restored before restarting motor Measure voltage during restart Ensure that steady state supply voltage at motor terminals is within limits see section 3 4 1 3 Motor is overoaded 1 Verify that motor amp load turn freely Repair binding components as needed 2 Motor bearings are seized Reduce driven load to match motor capacity or increase motor size to match load requirements Load Is jammed 1 Check fault codes on VFD and follow VFD troubleshooting procedures 2 VFD will not restart motor after tripping Verify that VFD input voltage is balanced and within limits 3 Remove excessive mechanical load if present Supply voltage has drooped or has become severely unbalanced g z Capacitor failure on single phase motor if equipped Warning Potential Shock Hazard Contact service shop to check capacitor EJE F cell eo E mi fe mpr e iy t A Motor leads are not connected correctly Match motor lead wiring to nameplate diagram kes too long to accelerate 1 Ensure that steady
32. ply Limits 3 4 2 Terminal Box 3 4 2 1 Conduit opening 3 4 2 2 Hazardous Locations 3 4 3 Lead Connections 3 4 3 1 Wire Size Requirements Single Phase 3 4 3 2 Extension Cords Single Phase 3 4 4 Ground Connections 3 4 5 Start Up 3 4 5 1 Start Up No Load Procedure 3 4 5 2 Start Up Load Connected Procedure 3 4 5 3 Jogging and or repeated starts 4 0 MAINTENANCE 4 1 General Inspection 4 1 1 Ventilation 4 1 2 Insulation 4 1 3 Electrical Connections 4 2 Lubrication and Bearings 4 2 1 Grease Type 4 2 2 Bearing Operating Temperature 4 2 3 Lubrication Interval 4 2 4 Lubrication Procedure 4 2 5 Lubrication Example 4 3 Trouble Shooting 4 3 1 General Trouble Shooting Warnings 1 0 INSTALLER OWNER OPERATOR RESPONSIBILITY 1 1 ELECTRICAL SAFETY A WARNING ELECTRICAL SHOCK HAZARD Electrical connections shall be made by a qualified electrician in accordance with all applicable codes ordinances and sound practices Failure to follow these instructions could result in serious personal injury death and or property damage Only qualified personnel who are familiar with the applicable National Code USA NEC and local codes should install or repair electrical motors and their accessories A WARNING ELECTRICAL LIVE CIRCUIT HAZARD Do not touch electrically live parts Disconnect lockout and tag input power supply before installing or servicing motor includes accessory devices Use a voltmeter to verify that power is off before contac
33. reign materials clear vent openings fan guard air inlets and frame fins TEFC motors TEAO Totally Enclosed Air Over motors Measure airflow next to motor surface and obtain minimum requirements from motor manufacturer E Motor is started too frequently See section 3 4 5 3 Driven Load is excessive o Ejeje Z Insufficient Air Flow xw 1 Ensure that steady state supply voltage at motor terminals is within limits see F Supply voltage too low too high or unbalanced section 3 4 1 3 Correct as needed 2 Reconnect motor per input voltage 3 Obtain correct motor to match power supply Motor Vibrates OE a 1 Ensure that load is dynamically balanced 2 Remove motor from load and B Load out of balance Direct drive application inspect motor by itself Verify that motor shaft is not bent Rule of thumb is 0 002 runout for shafts extension lengths up to 3 00 Add 0 0005 per every additional inch of shaft length beyond 3 00 c Uneven tension on multiple belts Mixing new with used belts Replace multiple belt applications with a complete set P of matched belts 1 De energize motor and record vibration as load coasts from 100 speed to 0 RPM If vibration drops immediately vibration source is electrical If levels do not D Driven load operating at resonant point natural drop immediately source is mechanical 2 Redesign system to operate below the 7 Tfrequency resonant point
34. s Listed under UL s category Motors and Generators Rebuilt for use in Hazardous Locations Failure to follow these instructions could result in serious personal injury death and or property damage WARNING ELECTRICAL SHOCK HAZARD Electrical connections are to be made by a qualified electrician in accordance with all applicable codes ordinances and sound practices Failure to follow these instructions could result in serious personal injury death and or property damage Only qualified personnel who are familiar with the applicable national codes local codes and sound practices should install or repair electric motors and their accessories WARNING ELECTRICAL LIVE CIRCUIT HAZARD Do not touch electrically live parts Disconnect lockout and tag input power supply before installing or servicing motor includes accessory devices 4 1 GENERAL INSPECTION Inspect the motor approximately every 500 hours of operation or every three months whichever occurs first Keep the motor clean and the ventilation and fin openings clear The following steps should be performed at each inspection 4 1 1 VENTILATION Check that the ventilation openings and or exterior of the motor is free of dirt oil grease water etc which can accumulate and block motor ventilation If the motor is not properly ventilated overheating can occur and cause early motor failure 4 1 2 INSULATION Use a Megger periodically to ensure that the integrity of th
35. s the UL Listing Mark and the UL Mark for Canada This plate also bears the phrase Electric motor for Hazardous Locations and is marked with the Class Group and Operating Temperature Code Division 2 Installations Class only Use only motors that are CSA Certified and bear the CSA Certification Mark These motors include a phrase on the main motor nameplate that indicates the motor is CSA Certified for Class I Division 2 Zone 2 locations Division 2 Installation Class Il only Use only Class II motors as described above under Division Installations WARNING EXPLOSION HAZARD A motor should never be placed in an area with a hazardous process or where flammable gases or combustible materials may be present unless it is specifically designed and nameplated for this type of service Hazardous Locations motors are intended for installations in accordance with NEC Article 500 For all installations involving Hazardous Locations motors consult the NEC local codes and the authority having jurisdiction Failure to follow these instructions could result in serious personal injury death and or property damage For other limitations see section 1 3 3 2 MOUNTING MOTOR 3 2 1 RIGID BASE FOOTED The motor must be securely installed to a rigid foundation or a mounting surface to minimize vibration and maintain alignment between the motor shaft and the load s shaft The mounting surfaces of the four mounting pads must
36. state supply voltage at motor terminals is within limits see section 3 4 1 3 Correct as needed 2 Obtain correct motor to match actual supply voltage Determine correct motor size and contact motor representative to obtain replacement motor Supply voltage has drooped or become severely 7 Junbalanced xw Load exceeds motor capability Motor may be too small for load Record acceleration time Start capacitors may Faulty start capacitor Single Phase fail if acceleration time exceeds 3 seconds 2 1 Check to make sure motor amp load turn freely 2 Disconnect motor from load amp E Mechanical Failure ensure motor turns freely Motor rotates in the wrong direction a Single Phase Reconnect motor according to wiring schematic provided Note A Incorrect wiring connection at motor Some motors are non reversible Three Phase Interchange any two power supply phase leads Motor overheats or overload protector repeatedly trips 1 If motor current exceeds nameplate value ensure that driven load has not increased Correct as needed 2 If new motor is a replacement verify that the rating is the same as the old motor If previous motor was a special design a general purpose motor may not have the correct performance Ambient temperature too high Most motors are designed to operate in an ambient up to 40 C See section 4 2 2 Hot Surface Caution Motor cooling fins and or vent openings blocked Remove fo
37. the nameplate 1 THERMALLY PROTECTED This motor has built in thermal protection Thermal protectors open the motor circuit electrically when the motor overheats or is overloaded The protector cannot be reset until the motor cools If the protector is automatic it will reset itself If the protector is manual disconnect motor from power supply After protector cools five minutes or more press the reset button and reapply power to the motor In some cases a motor is marked Auto and the connection diagram on the motor will identify T Stat leads see 2 below See warnings on Manual and Automatic reset protectors section 1 1 2 WITH OVERHEAT PROTECTIVE DEVICE This motor is provided with an overheat protective device that does not directly open the motor circuit Motors nameplated with this phrase have either thermostats thermisters or RTD s The leads to these devices are routed into the motor conduit box or into an auxiliary box The lead markings are defined on the nameplate normally P1 P2 The circuit controlled by the overheat protection device must be limited to a maximum of 600 volts and 360 volt amps See connection decal provided inside the terminal box cover Failure to connect these over temperature devices when provided will void the warranty WARNING EXPLOSION HAZARD For Hazardous Locations motors provided with thermostats UL and the NEC require connection of thermostat leads i
38. ting conductors WARNING ELECTRICAL GROUNDING HAZARD Failure to properly ground motors per the appropriate national code such as the National Electrical Code NEC Article 430 and local codes may cause serious injury or death to personnel For general information on grounding refer to NEC Article 250 Also see Ground Connections section 3 4 4 WARNING AUTOMATIC RESET PROTECTOR HAZARD Do not use automatic reset protectors if automatically restarting the motor will place personnel or equipment at risk Failure to follow this instruction could result in serious personal injury death and or property damage A WARNING MANUAL RESET PROTECTOR HAZARD If a tripped manual reset thermal protector is exposed to a temperature less than 7 C 20 F it may reset and restart the motor automatically If an application requires a motor with a manual reset thermal protector that will be operated at temperatures less than 7 C 20 F contact the manufacturer to review the application motor requirements Failure to follow this instruction could result in serious personal injury death and or property damage 1 2 MECHANICAL SAFETY A WARNING LOOSE PARTS HAZARD Before starting the motor remove all unused shaft keys and loose rotating parts to prevent them from flying off Failure to follow these instructions could result in serious personal injury death and or property damage A WARNING ROTATING PARTS HAZARD Keep extremities hair j
39. tor or a motor with a roller bearing may result in bearing damage 3 3 3 DIRECT CONNECTED Radial loading for direct connected equipment gears fans etc must be approved by the motor manufacturer unless within the maximum overhung load limits For radial overhung load limits see Table 3 2 on motor manufacturer s web site listed on page 2 Combined loading axial radial and or moments must be approved by motor manufacturer For belted loads see section 3 3 4 3 3 4 BELTED The goal of any belted system is to efficiently transmit the required torque while minimizing the loads on the bearings and shafts of the motor and driven equipment This can be accomplished by following four basic guidelines 1 Use the largest practical sheave diameter 2 Use the fewest number of belts possible 3 Keep sheaves as close as possible to support bearings 4 Tension the belts to the lowest tension that will still transmit the required torque without slipping It is normal for V belts to squeal initially when line starting a motor 3 3 4 1 Sheave Diameter Guidelines In general smaller sheaves produce greater shaft stress and shaft deflection due to increased belt tension See Table 3 3 for recommended minimum sheave diameters Using larger sheaves increases the contact with belts which reduces the number of belts required It also increases the belt speed resulting in higher system efficiencies See figure 1 When selecting sheaves do not e
40. ulation life limit VFD to motor cable lengths of general purpose motors to Table 3 5 values Definite purpose VFD motors may accommodate longer cable lengths For additional information contact motor manufacturer Table 3 5 Max Cable Lengths General Purpose Motors These values are based on 3 kHz carrier frequency Add suitable VFD output side filters when exceeding the listed values nema 6 220 coon 125r aon 3 3 5 3 VFD Grounding Equipment grounding conductors may be run in the same conduit as the AC motor power leads This wire must be used as the equipment ground for the motor and not as the fourth current carrying wire of a WYE motor circuit The grounded metal conduit carrying the output power conductors can provide EMI shielding but the conduit does not provide an adequate ground for the motor a separate grounding conductor must be used Grounding the motor neutral WYE of a VFD powered motor may result in a VFD ground fault trip Improper grounding of an inverter fed motor may result in frame voltages in excess of 500 Volts See Grounding section 3 4 4 3 3 5 4 VFD Single Phase CAUTION SINGLE PHASE MOTOR FAILURE Single Phase motors are NOT suitable for use on VFD power Connecting a Single Phase Motor to a VFD voids the warrantee 3 3 6 ACCESSORIES PROVISIONS 3 3 6 1 General Carefully read and understand the accessory manufacturer s instructions supplied with motor Contact the accessory manufa
41. xceed the manufacturer s recommended maximum belt speed typically 6 500 feet per minute for cast iron sheaves Determine belt speed by the following formula Figure 1 Avoid Desired Shaft RPM x 3 14 x Sheave Dia inches BELT SPEED Ft min 12 3 3 4 2 Number of Belts In general use the fewest number of belts that will transmit the required torque without slipping See Table 3 3 for recommended maximum number of belts Each belt adds to the tension in the system which increases load on the shafts and bearings Belts are most efficient when operated at or near their rated horsepower If the sheaves have more grooves than the number of belts required use the grooves closest to the motor 3 3 4 3 Sheave Location Install sheaves as close to the housing as possible to increase the bearing life of the motor and driven equipment See figure 2 3 3 4 4 Belt Tension A CAUTION Equipment Failure Caution Belt tensioning by feel is NOT acceptable Tensioning by feel can be very misleading and can damage motor and equipment It is normal for V belts to squeal initially when line starting a motor In general belt tensions should be kept as loose as possible while still transmitting the required torque without slipping Belt tensions must be measured with a belt tension gage These inexpensive gages may be obtained through belt manufacturers or distributors Figure 2 Avoid Desired Proper belt tension is determine
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