TECO AEHB Instruction Manual
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TECO AEHB Instruction Manual

Squirrel cage induction motors
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TECO Instruction Manual
Squirrel Cage Induction Motors
Whilst Motors are installed awaiting commissioning they must be adequately
protected against the elements, all external components 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 the non drive end and drive end antifriction bearings
are fully purged with sufficient grease at first start up/commissioning
with the recommended grade and quantity of grease.

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  • Page 1 TECO Instruction Manual Squirrel Cage Induction Motors Whilst Motors are installed awaiting commissioning they must be adequately protected against the elements, all external components 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.

  • Page 2: Table Of Contents

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors TECO Electric & Machinery Co. Ltd. Table of Contents Table of Contents ....................2 Chapter 1: MOTOR DESCRIPTION ..............4 Chapter 2: TECHNICAL DATA ................5 Chapter 3: INSTALLATION AND COMMISSIONING .......... 6 3.1.
  • Page 3 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 6.3. VARNISH..................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 ..................

  • Page 4: Chapter 1: Motor Description

    MOTOR DESCRIPTION This manual applies to Teco model series types as follows: AEEB, AEVB, AEHB, AEMB, AEUB, AEHD, AEJE, AFJE, AEJU, AEJH and AFJH. The motors are of Cast Iron Construction, Totally Enclosed Fan Cooled, Squirrel Cage Induction type designed for operation on a 415/1000/3,300/6,600V/ 3 Phase 50Hz supply system equipped with grease lubricated anti friction type bearings.

  • Page 5: Chapter 2: Technical Data

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Chapter 2: TECHNICAL DATA This manual covers a power outputs ranging through to 1500kW with varying frame sizes and speeds etc. For motor technical data refer to appropriate motor data sheet.

  • Page 6: Chapter 3: Installation And Commissioning

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Chapter 3: INSTALLATION AND COMMISSIONING 3.1. INSPECTION UPON RECEIPT. Check the following points upon receipt: a. Is the nameplate rating identical to your order? b. Do dimensions and colour comply with your specification? c.
  • Page 7 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 3.2.3 Insulation resistance test should be performed before making high voltage test. Use 500VDC megger to measure insulation resistance. i. Stator: Over 50MΩ between windings. ii. Stator: Over 50MΩ between windings and earth.
  • Page 8 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors An accident could occur if the motor eyebolt/lifting hook is overloaded. They are suitable for the motor weights only. Do not lift motor and load combined with motor lifting hook.

  • Page 9: Transportation

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 3.3. TRANSPORTATION To keep the rotating parts of motor from moving, thus causing damage during Transportation, they should be held securely as follows: 3.3.1. Motors fitted with a retaining plate/bracket to secure the shaft must have it fitted during transportation.

  • Page 10: Installation

    Two pole motors and motors larger than Frame 315M must not be coupled to the driven equipment by means other than direct connection. Please refer to TECO if belt connection is to be used. Teco Electric and Machinery Company Manual Number: IOM ~ TEFC Rev.01...
  • Page 11 Under no circumstances may the motor shaft be modified as to configuration or diameter without the approval of Teco Australia. The motor shaft extension must not be subjected to either extreme heat or cold during coupling installation.
  • Page 12 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 3.6.4 It is desirable, in normal operation that the motor operates, so that no axial force is exerted on the coupling. The motor shaft and the driven shaft should be aligned within the following tolerances in both angular and parallel alignment (refer Table 1).

  • Page 13: 3.7. Installation For Belt Drive

    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 please inform TECO of the size of the sheaves and belt details for checking.
  • Page 14 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors performance characteristics that may differ from those at the rated conditions:  +/- 10% of rated voltage  +/- 5% of rated frequency  +/- 10% combined voltage and frequency variation so long as frequency variation is no more than +/- 5% of rated value.

  • Page 15: Auxiliary Devices

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 3.9. AUXILIARY DEVICES 3.9.1. Please refer to your specification and the motor nameplate to determine if the motor is fitted with thermal winding protection devices. The following are the most common: One set (one per phase –...
  • Page 16 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Thermistors and/or RTD’s should not be meggered or tested at a voltage above 2.5Volts. Should the motor thermal protection circuit trip indicating over temperature the cause/s should be thoroughly investigated before a restart is attempted.

  • Page 17: Chapter 4: Operating Instructions

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Chapter 4: OPERATING INSTRUCTIONS 4.1. EXAMINATION BEFORE START. 4.1.1. After motor is installed the following points should be noted:- a. Check all wiring is correct and in accordance with connections appropriate to the supply voltage as shown on motor nameplate.
  • Page 18 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors be electrical as opposed to fuelled (such as kerosene) where a malfunction of the fuel burner could result in carbon deposits entering the motor. Caution must be exercised, when heating the motor with any source...

  • Page 19: 4.2. Starting Operation

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 4.1.4. Bearing Lubrication Grease Lubricated Type. The bearings are initially lubricated with the correct grade of grease at the factory. After installation, long storage and at initial start up/commissioning the bearings must be fully purged with new grease.
  • Page 20 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Motor can be restarted if the initial start fails. Three attempts are permissible when the motor is at ambient (cold) temperature. Two starts in succession are permitted when motor is at normal running temperature.

  • Page 21: Cautionary Points To Note

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Voltage variation should be confined to within +/-10% of nameplate voltage, and the three phase voltages should be balanced. Check if the phase currents of the motor, without load, are within +/-5% of the average values.
  • Page 22 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 4.3.2. Vibration: The ideal values generally for motors are figures below 2.8mm/sec. If vibration exceeds this level, an examination of the motor, load, structure etc, should be made to determine the cause, the first check to undertake would be to run the motor un-coupled and check if the vibration is still evident, see section 5.4 Vibration.

  • Page 23: Chapter 5: Routine Maintenance

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Chapter 5: ROUTINE MAINTENANCE 5.1. IMPORTANCE OF DAILY INSPECTION. 5.1.1. Normally electric motors do not fail suddenly. It happens over time, and regular inspection will detect a problem before a serious situation develops.

  • Page 24: Vibration

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 5.3.2. Main causes of high temperature: Motor Conditions Voltage and frequency variation of power source is in excess of tolerance. Unbalanced three phase voltage, open circuit or poor contact. iii.

  • Page 25: Noise

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Deformation of shaft. iii. Loose parts or couplings. 5.5. NOISE. 5.5.1. Points to Note. Not all noise is the result of a fault or abnormality. For instance, wind and slight electromagnetic sounds are perfectly normal. They will remain at the same level no matter how long the motor is in operation.

  • Page 26: Odour

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 5.6. ODOUR. 5.6.1. Causes of motor odours: Short circuit or over current causing overheating of varnish. Poor lubrication due to insufficient or contaminated grease. 5.7. MEASUREMENT OF THREE PHASE CURRENT.

  • Page 27: Motor Appearance

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 5.8. MOTOR APPEARANCE. 5.8.1. Reasons for Cleaning Excessive dust or oil accumulation on the motor surface leading to the clogging of ventilation channels between cooling ribs will reduce the motors cooling efficiency.

  • Page 28: Chapter 6: Periodic Maintenance

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Chapter 6: PERIODIC MAINTENANCE 6.1. REGULAR INSPECTION & MAINTENANCE. For safety, properly trained personnel must only carry out maintenance and repairs. Some testing, such as insulation resistance, usually requires the motor to be fully stopped and isolated from any power supply/supplies.
  • Page 29 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Ambient conditions. Start and stop frequency. iii. Trouble with components affecting motor functions. Parts which wear (eg. bearings). The important position of a motor in operation of a factory, mine etc.
  • Page 30 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Vacuum – Recommended for wound rotor/slip ring type. Vacuum cleaning can be used, both before and after other methods of cleaning, to remove loose dirt and debris. It is a very effective way to remove loose surface contamination from the winding.

  • Page 31: Cleaning Of Coils, Drying & Varnishing Treatment

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Motors should never be cleaned or disturbed whilst the motor is in operation. Isolate motor from supply before cleaning. 6.1.6. Checking motor installation and coupling. Installation: Is foundation solid? Are all bolts and/or nuts tight and in good order?
  • Page 32 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors c. Steam temperature should be maintained between 50 C – 80 d. After cleaning, dry immediately. 6.2.3. Drying Method. Application: Drying after cleaning. ii. Motor has absorbed moisture. Hot air method (using heater and blower).

  • Page 33: Varnish

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 6.3. VARNISH. Kind of Varnish JIS-W-25 or W-28 are highly recommended. Method of Varnish Treatment Dipping method: Immerse windings completely into varnish until no air bubbles appear. Pouring Method: Pour varnish completely over windings Note: Let varnish drip to dry after dipping or pouring.
  • Page 34 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 6.4.3. Items to be examined prior to initial operation. a. Cleaning:  Outside of motor.  Motor interior. b. Measurement of insulation resistance: Measurement of insulation resistance and standards to determine quality if Insulation resistance, please refer to measures stated in Section 4.1.2.

  • Page 35: Records Of Operation And Maintenance

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 6.5. RECORDS OF OPERATION AND MAINTENANCE. 6.5.1. Objective: Fully understand the site conditions of the motor in operation and discover any abnormalities in advance. Prevent the neglect and act of maintenance.

  • Page 36: 6.6. Points To Note On Disassembly

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 6.6. POINTS TO NOTE ON DISASSEMBLY. a. Disassemble according to the pre-set steps. b. Necessary tools should be ready before disassembly. Mark the disassembled parts so as to facilitate re-assembly.

  • Page 37: Chapter 7: Bearings

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Chapter 7: BEARINGS 7.1. MAINTENANCE OF ROLLING BEARING. Whilst Motors are installed awaiting commissioning they must be adequately protected against the elements, all external components 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.
  • Page 38 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 7.1.4. Grease Lubricated Type. Keeping the bearing lubricant in top condition is extremely important in the maintenance of bearings. It is a prerequisite of extended bearing life to replenish grease using the correct grade, quantity and time interval, please do not mix different types of grease.
  • Page 39 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Speed(RPM) Bearing Number 1000 1200 1500 1800 3000 3600 62XX 10 19000 18000 17500 16500 15500 14500 12500 11000 6000 4500 63XX 12 18000 17000 16500 15000 14500 13000 11000...
  • Page 40 7.1.6. Type of grease: TECO motors can utilise different types of grease including Shell Gadus & Mobil Polyrex EM Grease which has been selected based on the proposed application.
  • Page 41 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Bearing No. Amount of Bearing No. Amount of replenishment replenishment 62XX 6210 63XX 6310 72XX 73XX 6212 6312 NU2XX NU3XX 6213 6313 222XX 223XX 6214 6314 6215 6315 6216 6316...

  • Page 42: Noise Of Bearing

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors 7.1.10. Selection of grease gun. There are two types of grease gun. High pressure lever type and hand press type. As the hand press type has a lower force, grease replacement will take more time.
  • Page 43 Motors on VVVF Drives. All TECO motors are suitable for running on VVVF drives, however, this does depend on the application, kilowatt demand and speed range. TECO recommend that when motors of 280/315 frame and above be fitted with at...

  • Page 44: Chapter 8: Troubleshooting

    Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Chapter 8: Troubleshooting. 8.1. FAULT FINDING & RECOGNITION Kind of Symptom Cause Remedy Fault Fail to Motionless Power-off Consult power start without And soundless company load Switch-off Switch-on No fuse...
  • Page 45 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Kind of Fault Symptom Cause Remedy Overload after start Overheating Overload or Lighten Load of Motor Intermittent Overload Under-voltage Check circuit capacity and power source Over-voltage Check power source Ventilation duct...
  • Page 46 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Kind of Fault Symptom Cause Remedy Overload after Bearing Overheat Misalignment Re-align start between motor and load Not enough Fully purge grease bearings with grease High bearing Replace damaged noise...
  • Page 47 Teco Installation and Maintenance Manual TEFC Squirrel Cage Induction Motors Kind of Fault Symptom Cause Remedy Noise Mechanical noise Rubbing as a result Clean motor caused by of ingress of interior and machinery foreign matter ventilation ducts Wind noise Noise induced by...

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