Page 174 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 72 : Check the change of direction of rotation

Objectives

At the end of this exercise you shall be able to:
• draw the circuit diagram to run the motor by DOL starter
• run the motor and measure starting and running current
• reverse the direction of rotation
• construct forward reverse control logic for motor.
Requirements

Tools/Instruments

• Combination pliers 150mm -1 No. • DOL starter 5 HP/440V -1 No.
• Screw driver 100mm -1 No. • ICTP 32A/440V -1 No.
• Electrician knife 75mm -1 No. Materials
• Test lamp 60W -1 No. • PVC Copper wire 2.5mm - 18 m.
2
• Ammeter 0 – 25A MI -1 No. • 4 core cable 650 – 1100V - 6 m.
• Voltmeter 0 – 500V MI -1 No. • Contactor 440V, 16A -1 No.
Equipments/Machines • Overload relay set 0 – 10A -1 No.
• 3Ф Squirrel cage Induction • Push button switch NO 16A -2 Nos.
Motor 5 HP,1440rpm -1 No. • Push button switch NC 16A -1 No.

Procedure

TASK 1: Draw the circuit diagram to run the motor by DOL starter
1 Draw the circuit diagram as in Fig 1

2 Note down the name plate details of the 3Ф Squirrel Cage Induction Motor.
Fig 1

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CITS : Power - Electrician & Wireman - Exercise 71