Page 331 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 18.3: Connect, start and run an alternator and

buildup the voltage

Objectives

At the end of this exercise you shall be able to
• read and in terpret the name-platede tails of an alternator
• test and identify the terminals of an alternator
• connect,start,run,adjust the speed and frequency of the alternator
• adjust and settherated voltage of analternator
• determine the magneti sation character is ticofan alternator.
Requirements

Tools/Equipments Materials
• Insulatedcuttingpliers200mm - 1 No. • PVCinsulatedcoppercable
• Screwdriver150mm - 1 No. 2.5sqmm600Vgrade - 10m.
• Screwdriver100mm - 1 No. • Insulationtape - 30cm.
• VoltmeterAC0to500volts - 1 No. • Fusewire5A,15A - as reqd.
• AmmeterDC0to5amps - 1 No. • T.P.I.C.switch16amps500V - 1 No.
• Tachometer0to3000r.p.m. - 1 No. • D.P.I.C.switch32amps250V - 2 Nos.
• Singlephasefrequencymeter
250V-45to55Hz. - 1 No.

Procedure

Connect, start,run, adjust thespeed and frequency of an alternator
1 Read and interpret the name-platede tails inTable 1.
2 Test and identify the terminals of the alternator.
3 Test the alternator for insulation resistance between the windings,the winding and the ground,and record the
values separately.

The insulation resistance value should not be less than one megaohm.

4 Select a suitable range of rheostats, ammeters, voltmeters, switches and cables according to the specification
of the available alternator

You may have to change the ranges of the meters and rheostat according to the rating of the available
alternator with respect to Fig 1.
5 Make the connections as per the circuit diagram. (Fig1)

Fig 1

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