Eaton Cutler-Hammer W-VAC Instructions For Installation, Operation And Maintenance

I.B. 3A74791H04Page 14Effective 7/974-8.2 OPERATION CHECK PERFORMANCEMove the circuit breaker to the TEST position andengage the secondary contacts following the proceduredescribed in Paragraph 4-8.1. As soon as control powerbecomes available, the motor will charge the closingsprings with this condition indicated by a SpringCharged/Discharged Indicator on the front of the circuitbreaker (Figure 3-7). In addition, the status of the maincontacts, open or closed, is indicated on the front of thecircuit breaker.Using the close and trip buttons on the front of the cir-cuit breaker, close and trip the circuit breaker severaltimes to verify the closing and tripping operations.Conclude the check by closing the circuit breaker.4-9 BREAKER/STRUCTURE INTERFACINGType W-VAC Vacuum Circuit Breakers are supplied witha series of interlocks to insure safe and proper interfac-ing between the circuit breaker and a compatible struc-ture compartment. The specific interlocks are describedin the next paragraph to provide the proper familiariza-tion. Once the interlocks are reviewed, an interfacingcheck can be performed as described in Paragraph4-9.2.4-9.1 INTERFACE INTERLOCKSEach circuit breaker is supplied with the following inter-locks to insure safe and proper operation (Figure 4-2):Close and Trip Floor TrippersMounted on the bottom of the circuit breaker, theseinterlocks interface with compatible structure interlocksto render the circuit breaker mechanism mechanicallyand electrically trip free during the levering process.Anti-Close InterlockThis interlock prevents releasing the closing springselectrically or manually if the circuit breaker is alreadyclosed (Figure 5-5). On a closed circuit breaker, theinterlock lever moves toward the rear. In this position,the movement of the spring release clapper does not liftthe lever and thus the spring release latch cannot bemoved.4-9.2 INTERFACING CHECKKeep in mind that an interfacing check will be made witha compatible structure. As such, the instructions provid-ed with the assembly will suggest other interfacing con-ditions that should be observed and/or checked, such asprimary shutter operation, MOC/TOC operation and lev-ering handle insertion. A complete, coordinated inter-face check, therefore, will be a blend of the circuitbreaker instructions and those provided with the struc-tural assembly. Together all required standards are metand the ultimate in safety is achieved.Insert the circuit breaker into the structure and lever itinto and out of each different position by following theprocedures described in Paragraph 4-8.1.When the secondary contacts are manually engaged inthe TEST position, the motor will charge the closingsprings. Close the circuit breaker. Attempt to engage thelevering crank to begin moving the circuit breaker to theCONNECTED position. It will first be noticed that thelevering crank cannot be engaged with the breakerclosed. In addition, charged springs will be dischargedas the circuit breaker starts to move.Once in the CONNECTED position, remove the leveringhandle, close the circuit breaker and the motor will begincharging the closing springs if control power is available.Once again engage the levering handle which can onlybe accomplished with the circuit breaker open.Lever the circuit breaker toward the TEST position. Thecircuit breaker will be in a trip-free condition. Continue tolever the circuit breaker all the way to the TEST positionand the secondary contacts will be disengaged, nowmaking it the DISCONNECT position.Manually engage the secondary contacts and the motorwill charge the closing springs. Close the circuit breakerand begin to remove the circuit breaker to the WITH-DRAWN position by lifting and pulling on the Lift/Pullhandle. The circuit breaker will trip, close and trip as itmoves from the TEST position.The suggested combination of interface checks outlinedin the circuit breaker manual and structural assemblymanual are intended to verify safe and proper operation.If observed conditions are not as described, contactCutler-Hammer for assistance.