To study the part dismantling reassembling testing and repairing of ceiling fan.

By:- Surya Lal

TGT (WE) K.V.2,FCI GORAKHPUR

Object:-

Schematic Circuit Diagram of Schematic Circuit Diagram of Ceiling Fan & Regulator Connection Ceiling Fan & Regulator Connection

Working principle of Working principle of MotorMotor

If a current carrying conductor is If a current carrying conductor is placed in a magnetic field it placed in a magnetic field it experience a force and start to experience a force and start to rotate. The direction of rotation can rotate. The direction of rotation can be found bybe found by Fleming’s Left Hand Fleming’s Left Hand RuleRule..

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Working principle of Working principle of ceiling Fanceiling Fan

In a ceiling fan there is a single phase capacitor start motor. In a ceiling fan there is a single phase capacitor start motor. There are main or running winding and auxilary or There are main or running winding and auxilary or standard winding in the fan. Starting winding has standard winding in the fan. Starting winding has capacitor in its series. Due to this capacitor single phase is capacitor in its series. Due to this capacitor single phase is divided in two phase and a rotating magnetic field is divided in two phase and a rotating magnetic field is produced and due to internal reaction motor start to produced and due to internal reaction motor start to rotaterotate..

PARTS OF CEILING FAN:-

• Shackle• Shackle nut bolt &

locking pins• Down Rod• Top & Bottom

canopies• Condensor• Locking Screw 5mm• Coupling bolts

PARTS OF CEILING FAN

Terminal box Bearing Covers (Top &

Bottom) Bearings (Top &

Bottom) Body Covers (Top &

Bottom) Stator (in sided) Rotor Windings

POSSIBLE POSSIBLE FAULTS:-FAULTS:-

(A) Mechanical faults:-(A) Mechanical faults:-1.1. Bent shaftBent shaft

2.2. Wrong fitting of StatorWrong fitting of Stator

3.3. Defect in bearingDefect in bearing

Due to all above faults fan may not Due to all above faults fan may not run properly or run very slowlyrun properly or run very slowly..

After checking shaft and bearing After checking shaft and bearing should be change and stator can should be change and stator can be fit properly.be fit properly.

(B) Electrical Faults:-(B) Electrical Faults:-1.1. Open circuit, Short circuit Open circuit, Short circuit

in main winding.in main winding.2.2. Open circuit, Short circuit Open circuit, Short circuit

in main starting winding.in main starting winding.3.3. Open circuit, Short circuit Open circuit, Short circuit

in the condensor.in the condensor.4.4. Earth Fault.Earth Fault.5.5. Fan motor rotate in reverse Fan motor rotate in reverse

directiondirection..

TESTING & REPAIRING:-

1. Open circuit short circuit & closed circuit test in Main winding:-

Make the arrangement as per diagram-

Main Winding

(i) If bulb gives no light :There is disconnection in the Main winding.(ii) If bulb gives full light: There is short circuit in the Main winding.(iii) If bulb gives dim light: There is no fault in the Main Winding.

2. Open circuit short, short circuit and close circuit in starting winding.

(i) If bulb gives full light:-Then short circuit fault. Rewind it.

(ii) If bulb gives no light:-There is a disconnection in winding. Rewind it.

(iii) If bulb gives dim light: winding has no fault. (O.K.)

Starting windingMain winding

TESTING OF EARTH FAULTTESTING OF EARTH FAULT Make the arrangement as Make the arrangement as

per circuit diagram and per circuit diagram and see the light effect of bulb-see the light effect of bulb-

If bulb gives light: There is If bulb gives light: There is earth fault i.e. leakage of earth fault i.e. leakage of current in the metalic part current in the metalic part of fan’ body.of fan’ body.

Check and remove it Check and remove it before using.before using.

If bulb gives no light: No If bulb gives no light: No earth faultearth fault

i.e. no leakage of current i.e. no leakage of current in the body of fan.in the body of fan.

Testing of Condensor• Make arrangement as per

diagram.(i) If bulb gives full light:-Then short

circuit fault. Replace it. (ii) If bulb gives no light:-There is a

disconnection/open in the Condensor.

(iii) If bulb gives dim light: Condensor has no fault. (O.K.).

• Before removing or connecting the Condensor its both terminal should be short with screw driver to avoid electric shock .

REASSEMBLIGREASSEMBLIG

Close the bottom Close the bottom cover and screwed cover and screwed it.it.

Make the Make the connection as per connection as per diagram.diagram.

Hang the fan at Hang the fan at required place.required place.

Connect the fan Connect the fan connection to the connection to the supply wire. supply wire.

Precautions

• Before hanging fan all testing should be done properly.

• Fan’s body (metallic part) should be earthed .

• Nut bolt should be tighten correctly.

• Locking pin should be used.

• Connection should not be lose.