Page 142 - Electrician - TT (Volume 2)

ELECTRICIAN - CITS

Maintenance of MG set

Objectives: At the end of this lesson you shall be able to:
• list out the points to be considered for maintenance of MG set.

The MG set must be maintained by inspecting electrically and mechanically. The following points to be considered
while carrying out maintenance.

Electrical inspection list
• General cleaning of all electrical components and control panels
• Check/rectify motor insulation resistance by megger
• Check/rectify earth wiring
• Check/rectify main switch fuses

• Check/rectify stator, brushes etc.
• Check/rectify bearings of motor, rotating parts and use oil grease for proper lubrication
• Check/rectify/check starting panel
• Check/rectify over load relays
• Check/rectify loose connections and tighten them

• Replace damaged flexible conductors and cables
• Check/rectify the control system
• Replace the carburized non operative contactor if necessary.
Carry out the maintenance work in MG set by referring the mechanical inspection list and lubrication instruction
given below
Mechanical inspection list
• Clean thoroughly and do visual inspection
• Check/rectify motor couplings and bearings

• Check for tightness of coupling, checking formulation both,
• Checking of pipeline flanger
• Check/rectify machine for functional operation and verify with the operator
• Lubrication, Maintenance prints

• Check/rectify the bearings for the lubrication
• Use oil gun/grease to lubricate the same.
A separate register is to be maintained by the maintenance authority to keep the records for each
maintenance on all working days.

Attend the breakdown maintenance of mechanical and electrical nature, during the operation of the MG set.

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CITS : Power - Electrician & Wireman - Lesson 76-85