Page 175 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

TASK 2: Run the motor and measure starting and running current
1 Connect the motor as per diagram.
2 Switch on the ICTP.
3 Start the motor by pressing the start button and observe the direction of rotation.
4 Measure the starting current and running current and record in Table 1

5 Switch OFF the motor by pressing the stop button.
Table 1
Sl.No Starting current (A) No load running current (A)

TASK 3: Reverse the direction of rotation

1 Interchange any two connections to the motor to reverse the direction of rotation.
2 Start the motor by pressing the start button.
3 Observe the direction of rotation. It should be of reverse direction.
4 Stop the motor by pressing the stop push button

5 Switch off the supply and disconnect.

TASK 4: To construct a forward switch control circuit and run 3Ф Induction Motor
1 Draw the circuit diagram as in Fig 2a
2 Make the connections as per the circuit diagram.
3 Trace control circuit as per Fig 2b
3 Set the over load relay current.

4 Switch on the supply and run the motor in forward direction by the first contactor.
5 Stop the motor by switching off the stop switch.
6 Switch on the second contactor and run the motor in the reverse direction.
7 Stop the motor by pressing STOP push button.

8 Switch OFF the supply and remove the connections.

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CITS : Power - Electrician & Wireman - Exercise 72