Work on the operating mechanism should be carried out only when the springs are in discharged condition and the circuit breaker is in open position.
Quarterly Maintenance :
| 20 E-01 Q |
Clean the operating mechanism, whenever required. |
| 20 E-02 Q |
Clean the auxiliary switch contacts. |
| 20 E-03 Q |
Clean the terminal blocks |
| 20 E-04 Q |
Tighten the electrical connections. |
| 20 E-05 Q |
Check gear wheels for any wear and tear, replace, if necessary. |
| 20 E-06 Q |
Check proper functioning of closing and tripping coil. |
| 20 E-07 Q |
If overhauling has been done then check by manual charging operation of closing spring to check that the limit switch contact of closing-coil circuit closes 1-2 mm before the contact in the motor circuit; opens.
|
| 20 E-08 Q |
Check the function of limit switch. |
| 20 E-09 Q |
Check whether heater is functioning properly. |
| 20 E-10 Q |
Check that the foundation bolts are properly tightened. |
Yearly Maintenance or After Approximately 500 Operations:
| 20 E-11 Y |
Check the earthing of operating mechanism cubicle. |
| 20 E-12 Y |
Replace the parts if wear and tear is more. |
| 20 E-13 Y |
Gear wheels should be lubricated ensuring that no grease comes into the friction clutch. Wipe off if it is there. Grease 784 is to be used. |
| 20 E-14 Y |
Apply rust preventing medium on untreated surfaces of iron and steel. |
| 20 E-15 Y |
Check operation of motor. |