Quantcast Table 3.1 Troubleshooting Chart for Circuit Breaker Operation

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TABLE 3-1 ... (continued)
TROUBLESHOOTING CHART FOR CIRCUIT BREAKER OPERATION





Trouble
Probable Cause
Course of Action


 o Blown fuse in control  Replace blown fuse.


  circuit.



 o Loose or broken wire  Repair faulty wiring.


  in trip circuit.
 See that all binding



 screws are torqued to



 manufacturer's or U.L.



 specifications.


 o Dirty contacts on
 Clean dirty contacts.


  tripping device



  (Control switch,



  protective relays,



  or auxiliary switch).  


 o Failure of control
 Investigate.


  power.






 Failure to close.   o Blown fuse in control  Replace blown fuse.


  circuit.



 o Loose or broken wire  Repair faulty wiring.


  in trip circuit.
 See that all connections  


 torqued to



 manufacturer's or U.L.



 specifications.






 o Dirty contacts on
 Clean dirty contacts.


  tripping device



  (Control switch or



  auxiliary switch).






 Failure to close.   o Failure of control
 Investigate.


  power.







 o Insufficient air
 Investigate.


  pressure.






 Unnecessary
 o Setting of relays or
 Set relay or device for

 tripping (that
  calibration setting
 proper value according

 is tripping when    of direct tripping
 to ampere load of

 tripping should    device too low.
 circuit.

 not occur).



    





 


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