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Teco Installation and Maintenance Manual 
TEFC Squirrel Cage Induction Motors 

Teco Electric and Machinery Company 

Manual Number: IOM ~ TEFC Rev.01 

47 

 

Kind of Fault 

Symptom 

Cause 

Remedy 

Noise 

Mechanical noise 
caused by 
machinery 

Rubbing as a result 
of ingress of 
foreign matter 

Clean motor 
interior and 
ventilation ducts 

Wind noise 

Noise induced by 
air flowing through 
ventilation ducts 

Induced by 
conveyance 
machine 

Repair machine 

Vibration 

Electro-magnetic 
vibration 

Short circuit of 
windings 

Repair 

Open circuit of 
rotor 

Repair 

Vibration 

Unbalanced rotor 

Repair 

Unbalanced fan 

Repair 

Mechanical 
vibration 

Broken fan blade 

Replace fan 

Un-symmetrical 
centres between 
belt sheaf 

Align central points 

Central points of 
couplings do not lie 
on the same level 

Adjust the central 
points of couplings 
on the same level 

Improper mounting 
installation 

Lock the mounting 
screw 

Motor mounting 
bed is not strong  

Reinforce mounting 
bed 

 

Remarks: 
i.

 

Circuit switches: This includes knife switch, electromagnetic switch, fuse and 
other connection switches etc. 

ii.

 

Starting switches: This includes Delta-Star starter, compensate starter, 
reactance starter, resistor starter, starting controllers etc. 

Содержание AEEB

Страница 1: ...mponents in particular the shaft extension and external labyrinth seals at the drive end must be fully covered to avoid water ingress entering the motor body whilst stationery Please ensure that both...

Страница 2: ...10 3 6 COUPLING ALIGNMENT 10 3 7 INSTALLATION FOR BELT DRIVE 13 3 8 ELECTRICAL CONNECTIONS 13 3 9 AUXILIARY DEVICES 15 Chapter 4 OPERATING INSTRUCTIONS 17 4 1 EXAMINATION BEFORE START 17 4 2 STARTING...

Страница 3: ...33 6 4 KEY POINTS FOR MAINTENANCE INITIAL OPERATION INSPECTION AFTER LONG STORAGE 33 6 5 RECORDS OF OPERATION AND MAINTENANCE 35 6 6 POINTS TO NOTE ON DISASSEMBLY 36 Chapter 7 BEARINGS 37 7 1 MAINTEN...

Страница 4: ...these instructions and must not be altered or modified in any unauthorized manner During the installation operation of motors in heavy industrial applications there is a danger of live electrical part...

Страница 5: ...on Motors Teco Electric and Machinery Company Manual Number IOM TEFC Rev 01 5 Chapter 2 TECHNICAL DATA This manual covers a power outputs ranging through to 1500kW with varying frame sizes and speeds...

Страница 6: ...your specification 3 2 STORAGE When storing motor the following procedures should be undertaken 3 2 1 Place a It should be dry well ventilated and not subject to direct sunlight dust or corrosive gas...

Страница 7: ...as the fitting surface key shaft extension and axial centre hole free of any foreign matter Grease should also be generously applied to stop rust 3 2 5 The shaft should also be rotated by hand a few r...

Страница 8: ...ed in c Keep the sling vertical when moving lifting motor Fig 1 Please keep the sling vertical when lifting moving the motor Fig 2 An accident could occur if the motor eyebolt lifting hook is overload...

Страница 9: ...it fitted during transportation Please retain this device for future transportation of the motor 3 3 2 After receiving motor remove all securing studs nuts etc before putting motor into operation Fig...

Страница 10: ...bration 3 4 2 Ventilation and Space a Installation should be well ventilated b The area should be large enough to facilitate heat dissipation and maintenance 3 4 3 Foundation Use rigid and solid sole...

Страница 11: ...o prevent bearing damage 3 6 2 After the motor has been properly aligned with the driven equipment and the hold down bolts have been installed and tightened at least two dowel pins should be installed...

Страница 12: ...RPM 0 03 0 04 High speed over 2500 RPM 0 03 0 03 Table 1 3 6 5 Angular misalignment is the amount by which the centre lines of the driver and driven shaft are skewed It can be measured using a dial in...

Страница 13: ...ation The smaller the outer diameter of the V belt sheave the greater the shaft bending stress will be If bending stress is in excess of the shaft fatigue stress the shaft may break If concerned pleas...

Страница 14: ...ameplate and should be undertaken by suitably qualified personnel 3 8 3 The main lead box furnished with the motor has been sized to provide adequate space for the make up of the connections between t...

Страница 15: ...Detectors RTD s 3 9 2 Where specified motors may also be equipped with PT100 bearing Resistance Temperature Detectors RTD s 3 9 3 Thermistors are positive temperature coefficient type 1000 ohm trippin...

Страница 16: ...details contained on the heater nameplate The heater circuit should be inter locked with the motor starter so as to de energise heaters when the motor is running Thermistors and or RTD s should not be...

Страница 17: ...grade of grease 4 1 2 Measurement of insulation resistance a Rated voltage below 1000V measure with 500VDC megger b In accordance with IEEE 43 clause 9 3 standards refer to following formula R M Rated...

Страница 18: ...rature above the dew point temperature d Should the resistance fail to attain the specified value even after drying careful examination should be undertaken to eliminate all other possible causes if a...

Страница 19: ...ng d Make sure the items above are examined Test the motor with or without load Record and check according to Maintenance at 15 minute intervals during the first three hours of operation Then conduct...

Страница 20: ...r rotor fails to start turning after two seconds shut off power supply immediately This can result from i Too low a voltage at the motor terminals ii The load is too large for motor rating iii The loa...

Страница 21: ...a The motor is fitted with grease lubricated bearings Following initial start up the bearing temperatures should be closely monitored A rapid rate of rise in bearing temperature is more indicative of...

Страница 22: ...time for this application shut off the power immediately Investigate thoroughly and take corrective action before attempting to restart b It should be recognised that each start of an induction motor...

Страница 23: ...gether with the operator 5 2 POINTS TO NOTE WHEN STARTING a Check power supply to see if voltage and frequency are normal b Is starter set at starting position c Are there sparks during start d Is the...

Страница 24: ...entilation ducts viii Motors cooling vents blocked b Due to load or mechanical conditions i Overload ii Defective transmission coupling iii Poor installation causing overload iv High ambient temperatu...

Страница 25: ...Normal bearing sound in general is continuous not intermittent The sound may tend to increase with the age of the bearings but its increase is gradual and hardly noticeable by the ear iii Abnormal be...

Страница 26: ...ed by poor coupling installation transmission structure excessive high or low voltage etc a Causes of unbalanced three phase current i Unbalanced three phase voltage ii Open circuit in power distribut...

Страница 27: ...EARANCE 5 8 1 Reasons for Cleaning a Excessive dust or oil accumulation on the motor surface leading to the clogging of ventilation channels between cooling ribs will reduce the motors cooling efficie...

Страница 28: ...ection and maintenance is important in preventing breakdown and lengthening service life c Owing to the varied uses and environments motors are placed in it is difficult to set periods for regular ins...

Страница 29: ...accumulated on coil may cause insulation deterioration and a reduction in cooling efficiency ii Moisture iii Discolouring from original colour Overheating mainly causes this c Stator wedges is there a...

Страница 30: ...and proper health and safety precautions should be followed while using it 6 1 5 Clean the exterior of the motor a The inlet air openings should not be allowed to accumulate any dirt dust slurry lint...

Страница 31: ...if the motor has been flooded or showing deterioration from age 6 2 1 Cleaning a If the coils are slightly contaminated compressed air cloth or a nylon brush can be used to do the cleaning However whe...

Страница 32: ...king area surrounded with steel plate with openings at the bottom ii This method can cause partial overheating So attention must be paid to the parts heated and the temperature must be kept below 1000...

Страница 33: ...ii Ensure ventilation is adequate during curing Combustible gases are present To ensure adequate insulation the above procedure should be repeated 6 4 KEY POINTS FOR MAINTENANCE INITIAL OPERATION INSP...

Страница 34: ...e motor shaft by hand if practical to see if it rotates smoothly and if there is any unusual noise 6 4 6 Replenishment of grease Refer to bearing maintenance Section 7 6 4 7 Switches and starters Clea...

Страница 35: ...e plans after fully understanding the operation of motor d Assess the life of parts to determine the quantity of spare parts to be kept e To plan the number of spare motors and replace or repair the m...

Страница 36: ...o facilitate re assembly d Place parts bolts and nuts etc in a box to avoid misplacing e Avoid damage to heavy parts during transportation f Dust accumulation on coil end ducts etc should be cleaned d...

Страница 37: ...uipped with through flush greasing facilities Grease replenishment is required if the motor has been out of service for 3 months or more and should also be carried out on initial start and at regular...

Страница 38: ...ntact surface has no metal to metal contact b Form a lubrication membrane on the rolling contact surface to reduce noise c Purge the motor of old and contaminated grease please ensure that the grease...

Страница 39: ...500 2500 2500 1000 1000 500 Table 3 Remarks a Please refer to lubrication nameplate fitted and follow the recommended schedule stated Bearing Number Speed RPM 600 720 750 900 1000 1200 1500 1800 3000...

Страница 40: ...ition physical properties and thickeners 7 1 7 Amount of grease replenishment Amount of grease replenishment depends on the type size and construction and the bearings For the maximum quantity used in...

Страница 41: ...38 350 6338 800 6240 400 6340 900 6244 450 6344 900 6248 500 6348 900 Table 4 Fill new grease until it displaces the old grease completely Do not grease the motor whilst it is at standstill If there i...

Страница 42: ...hat has a continuous rhythm with no sudden change is normal b Abnormal noise It is difficult to detect the early stages of bearing failure with the human ear It takes a lot of experience and a sharp e...

Страница 43: ...epend on the application kilowatt demand and speed range TECO recommend that when motors of 280 315 frame and above be fitted with at least an insulated bearing at the non drive end and rotor groundin...

Страница 44: ...k leads and repair Faulty winding Check winding and repair Fuse blowing Circuit Breaker trips off slow start with electromagneti c noise Short circuit Check circuit Incorrect wiring Check wiring Poor...

Страница 45: ...he foreign matter in the duct Ambient temperature exceeds 450 C Lower ambient temperature Friction between rotor and stator Repair Fuse blowing Single phase rotating Install the specified fuse Poor co...

Страница 46: ...ged bearing Noise Electro magnetic noise induced by electricity Occurrence from first operation Check noise not normal Sudden sharp noise and smoking Short circuit of windings Repair Bearing noise Not...

Страница 47: ...dings Repair Open circuit of rotor Repair Vibration Unbalanced rotor Repair Unbalanced fan Repair Mechanical vibration Broken fan blade Replace fan Un symmetrical centres between belt sheaf Align cent...

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