Page 252 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 96 : Demonstrate maintenance of AC/DC

machines, voltage stabilizer, UPS, Inverter
& Drives

Objectives

At the end of this exercise you shall be able to
• list out the trouble shooting procedure
• assess the symptoms
• test the parts
• service and maintain the appliances.
Requirements

Tools/Instruments
• Electrician tool kit - 1 Set • AC / DC machines - A/r
• Insulated cutting pliers 200mm - 1 No. • AC Drive, 2HP - 1 No.
• Soldering iron 25W, 125W, 240 V - 1 No. Materials
• Tray 200 mm x 200 mm x 50 mm - 1 No. Collect the circuits already constructed in experiment
• Tweezer 100mm - 1 No. 93 - as reqd.
• Spare components
Equipments/Machines • Solder 60/40 - as reqd.
• Voltage Stabiliser – 1kva - 1 No. • Soldering flux - as reqd.
• Meggar 500V - 1 No. • Connecting wires - as reqd.

Procedure

AC/DC machines

1 Record the name plate data.
Sl.No Description Value Remark
1 Name of the machine
2 Make
3 Model
4 Rated Voltage
5 Rated capacity
6 Rated current

2 Draw scheme of the equipment

3 Inspect the terminals for rust and replace rusted parts
4 Measure the winding resistance
5 Measure the insulation resistance between winding
6 Assess the insulation resistance value with manufacturer specified value
7 Inspect the bearings for noise and wear out.
8 Lubricate the bearings

voltage stabilizer
1 Record the name plate data
2 Draw scheme of the equipment

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