S.C.R. WAGON WORK SHOP, GUNTUPALLI

     MOUNTING AND DE-MOUNTING MACHINE FOR CTRB

Electrical

     Repair Procedure for Replacement of Motor: -

          1. Turn off the Power Supply.
          2. Remove the incoming supply connections from motor.
          3. Test the motor with “drop test “and record the values in Amps obtained in each phase i.e R,Y,B. If the
             obtained values in each phase have huge difference, then the motor winding is defective.
          4. Then test the motor with “insulation merger instrument” for measuring IR values of Phase to body of
             values. If the obtained value between phases to body is low then winding of the motor is defective.
          5. Once the motor winding is found defective then remove the bed bolts of the motor and then send              the motor for re-winding.
          6. After completion of re-winding, check the motor for drop test and IR value and record the
             values. Record the no load current values and RPM of the motor.
          7. Check the over load relay (OLR) with “Relay testing kit” before fitting the motor.
          8. Motor should be assembled at same pre-position & then tightened the motor bed bolts with proper tools.
          9. Once the motor is assembled then give Power supply connections properly.
         10. Now check the direction of rotation of the motor. If required inter change the required terminals of the connections.
         11. Once the motor is assembled then test the motor in full load current and record the values.
         12. Now the machine is ready for operation.

     Repair procedure for replacement of DOL Starter

          1. Switch off the Power Supply.
          2. Remove the incoming and outgoing connections from starter and provide insulation tape to
             incoming terminals.
          3. Checks the over load relay working condition on relay testing kit. If not working,
             replace the over load relay.
          4. Check the condition of “No Volt Coil”. If not working/burnt, replace “No volt Coil”.
          5. Check the condition of contact kits, if rusted clean the contacts with emery paper or
             contact rust cleaner (CRC). If damaged, replace the contacts.
          6. Check incoming / outgoing terminal stud at over load relay and contactor gets burnt or jammed then
             replace the DOL starter with new one.
          7. Bring the new starter and provide connections.