Page 167 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

MODULE 12: Induction Motors and Special Motors

EXERCISE 70 : Analyse connection of various starters

Objectives

At the end of this exercise you shall be able to:
• explain and connect DOL control circuit and power circuit
• connect semi-automatic star delta control circuit and power circuit
• connect automatic star delta control circuit and power circuit
• connect manual star delta control circuit and power circuit
• connect rotor resistance starter control circuit and power circuit
• connect auto transformer starter and run motor.

Requirements

Tools/Instruments
• Combination pliers 150mm -1 No. • STARTER as in objective 5 HP/440V -1 No.
• Screw driver 100mm -1 No. • TP switch 32A/440V -1 No.
• Electrician knife 75mm -1 No.
• Test lamp 60W -1 No. Materials
• Ammeter 0 – 25A MI -1 No. • PVC Copper wire 2.5mm -1 No.
2
• Voltmeter 0 – 500V MI -1 No. • 4 core cable 650 – 1100V -1 No.
Equipments/Machines
• 3Ф Squirrel cage Induction
Motor HP,1440rpm -1 No.
Procedure

TASK 1: Draw the power circuit & control circuit of the given starter

1 Draw the diagram of the power circuit and control circuit of the starter as in Table 1
Starter 1 Fig 1 DOL starter, power and control circuit
Fig 2 Power circuit for semi-automatic and automatic star delta starter
Starter 2 Fig 3 Semi-automatic star delta starter control circuit

Starter 3 Fig 4 Automatic star delta starter control circuit
Starter 4 Fig 5 Manual star delta starter power and control circuit
Starter 5 Fig 6 Rotor resistance starter power and control circuit
Starter 6 Fig 7 Auto transformer starter power and control circuit

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