Page 179 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 74 : Demonstrate starting and running
of Single-phase motors & change DOR

(direction of rotation)

Objectives

At the end of this exercise you shall be able to:
• connect and run capacitor- start capacitor -run motor
• reverse the DOR of capacitor- start capacitor-run motor
• connect and run capacitor-start capacitor-run motor after reversing DOR
Requirements

Tools/Instruments Equipments/Machines
• Combination pliers 150mm -1 No. • Capacitor start capacitor run
• Side cutter 150mm -1 No. motor 1ɸ,1HP, 230V -1 No.
• Electrician’s knife 75mm -1 No. • ICDP 16A, 230V -1 No.
• Neon tester 0-500V -1 No. Materials
• Ammeter 0-25A, MI -1 No.
2
• Series Test lamp 60W -1 No. • PVC insulated copper wire 1.5mm - 4m.
• Screw driver 100mm -1 No. • Capacitor 150mfd, 275V -1 No.
• Tachometer Digital -1 No. • Capacitor 30mfd, 440V -1 No.
• Multimeter Digital -1 No.
Procedure

TASK 1: Connect & run Capacitor - start,capacitor - run motor
1 Draw the circuit diagram as in Fig 1
2 Record the name plate details.
3 Identify the starting and running capacitor.
4 Test the capacitor using test lamp.
5 Identify the terminals of centrifugal switch by multimeter.
6 Check the centrifugal switch.

Fig 1

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