Page 180 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

The centrifugal switch will be in a closed condition when the motor is not running
7 Measure the resistance of each winding.
8 Identify the starting and running windings.
9 Check for non-continuity between both windings.
10 Check both the winding whether it is short.
The starting winding is having comparatively higher resistance.
11 Make the connections as per the circuit diagram
Get permission from instructor before switching ON the supply.
12 Switch ON the ICDP and run the motor.
13 verify that Centrifugal switch is open when motor attaining 75% of its rated speed.
14 Measure speed, starting and running current.
If any undue noise or vibration is noticed, stop the motor and inform the instructor
15 switch OFF the ICDP.

TASK 2: Reverse the DOR of capacitor- start,capacitor - run motor
1 Interchange terminals of running winding
2 Start and run the motor
3 Verify the change in direction of rotation of motor

TASK 3: Connect 2 run capacitor - start capacitor run motor after reversing DOR
1 Note down the name plate details of the induction motor and explain.
2 Test the capacitor.

3 Identify the terminals of centrifugal switch by multimeter.
4 Identify the starting and running windings using multimeter by resistance method.
5 Connect the motor as per diagram in Fig 2
6 Switch on the supply and start the motor.

Fig 2

7 Verify that CFS (Centifugal switch) is open when the motor attains 75% of its rated speed

8 Measure the starting and running currents.
9 Check the direction of rotation of motor.

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CITS : Power - Electrician & Wireman - Exercise 74