GE AK-50 installation instructions Installing the Trip Paddle, Adjusting the Flux Shifter

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Breakers with ECS or SST Trip Systems

1.Remove the ECS or SST trip unit.

2.Remove the existing flux shifter device and the trip unit control harness.

3.Install the new flux shifter assembly as described above and shown in Figure 5.

Installing the Trip Paddle

For breakers equipped with an ECS or SST trip sys- tem, the existing trip paddle is used with the new flux shifter.

For all other breakers, the existing trip paddles must be removed and the new trip paddle installed as follows:

1.Remove and discard the three trip paddles on the trip actuator bar, as shown in Figure 8.

2.Assemble the trip paddle and the threaded back plate by inserting two of the 10-32 x 3￿4" screws and lock washers provided along the top edge.

3.Slip the trip paddle over the trip actuator bar approximately one inch from the side frame, as shown in Figure 9. Insert the remaining 10-32 x 3￿4" screw and tighten the other screws to secure the trip paddle in place.

Adjusting the Flux Shifter

After the flux shifter and trip paddle are installed and the breaker frames are reassembled, the following adjustments must be made.

1.With the breaker OPEN and the mechanism charged, set the gap between the trip paddle and the end of the flux shifter rod at 0.10 inch, as shown in Figure 10. Use a 0.10-inch diameter rod. Set the adjuster end of the trip rod and lock it in place with the jam nut. Note that removal of the buffer stud will make the trip paddle easier to install and adjust.

2.As the crossbar travels between the breaker CLOSED and OPEN positions, the tang of the actuator bracket must clear the buffer stud. If there is insufficient clearance, loosen the two mounting screws and rotate the bracket clock- wise to take up mounting hole slack. Retighten the screws.

3.Optional Test – The flux shifter may be tested by closing the breaker and applying a 9 Vdc power source to the flux shifter leads (the red wire is positive). The breaker should trip.

Trip Paddles

Figure 8. Existing trip paddles to be removed.

1”

Trip

Paddle

Figure 9. Installing the new trip paddle.

Figure 10. Adjusting the flux shifter.

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Contents Introduction Table of Contents List of Figures Before Installation General InformationFront Frame Breaker Conversion Relocating and Remounting the W and X RelaysInstalling the Flux Shifter Assembly Breakers with EC or Power Sensor Trip SystemsBreakers with a Side Bracket AKU-50 Breakers OnlyBreakers with ECS or SST Trip Systems Installing the Trip PaddleAdjusting the Flux Shifter ECS or SST Trip System Installing the Trip Unit Mounting BracketEC or Power Sensor Trip System Trip unit mounting bracket attached to the mounting Plate Back Frame Conversion Crossbar ModificationAK-75 & AK-100 Breakers with SST Trip Systems Removing the Existing Trip DevicesAK-50 & AKS-50 Breakers with SST Trip Systems Installing the Phase Sensors AK-50 & AKS-50 BreakersPhase sensor installation on AK-75 & AK-100 breakers AK-75 & AK-100 BreakersInstalling the Trip Unit Configuring the Trip UnitAK-50 & AKS-50 Stationary Breakers FOUR-WIRE Ground Fault OptionInstalling the Fourth-Wire Disconnect AK-50 & AKS-50 Draw-Out Breakers AK-75 & AK-100 Draw-Out BreakersAK-75 & AK-100 back frame conversion Installing the Neutral Sensor Outline of the neutral sensor for AK-50 breakersOutline of the neutral sensor for AK-75 and AK-100 breakers Installing Mounting Brackets Equipment ConversionFourth-wire disconnect for AKD-5 & AKD-6 Testing and TROUBLE- Shooting TestingTrouble-Shooting Nuisance Tripping on Ground Fault-Equipped BreakersAK-50 Page Page Appendix Drill Templates Appendix 1. Drill Template for Flux Shifter MountingPage Page Page Page GE Industrial Systems