Westinghouse CA User Manual

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
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  




    
  
      
        
       
      
         
        


        
       
      


         

      
        
   
  
      
         
         
        
       
        

        
         
        
        

       
          
       

       
       
      
    
       
 
       
      
        
      
       
        
         
      
          
         
      
       
    

        
         
       
      
        
       
       
      
        
      
      
         
        
       
       
         
       

       
         
        

        
     
        
  
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Westinghouse CA Specifications

General

Type	Electromechanical Relay
Function	General Purpose
Operating Temperature Range	-40°C to +70°C
Mechanical Life	10, 000, 000 operations
Contact Rating	10A at 250VAC
Coil Voltage	12VDC
Electrical Life	100, 000 operations

Summary

CAUTION

APPLICATION

CONSTRUCTION

Percentage Differential Unit

Explains the induction disc unit, electromagnet, and flux principles.

Indicating Contactor Switch Unit (ICS)

Describes the d-c indicating contactor switch component.

OPERATION

CHARACTERISTICS

Trip Circuit Constant

Provides resistance values for the ICS unit's taps.

Indicating Contactor Switch (ICS) Settings

Details the ICS taps for pick-up settings and connection changes.

Energy Requirements

Specifies continuous and short-time current ratings for relay windings.

Settings

Mentions that only the time dial setting is required for the differential unit.

INSTALLATION

Contact

Describes the procedure for checking the relay's stationary and moving contacts.

Trip Circuit

Explains how to test the main and seal-in contacts for trip circuit integrity.

Differential Characteristics

Outlines tests to verify the relay's operating current limits.

Time Curve

Details how to test the relay's operating time against its time-current curves.

CALIBRATION

Calibration: Contact

Describes checking the relay's stationary contact position and gap.

Routine Maintenance

Recommends annual checks and periodic cleaning of all contacts.

ACCEPTANCE TESTS

Minimum Trip Current

Procedure to adjust and verify the minimum operating current.

Percentage Slope Characteristic

Verifies the relay's response curve against specified values.

Time Curve

Checks the relay's operating time against its characteristic curves.

RENEWAL PARTS