GE AK-50 installation instructions Back Frame Conversion, Crossbar Modification

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SECTION 4. BACK FRAME

CONVERSION

The back frame conversion consists of the following operations:

1.Modification of the crossbar assembly for the flux shifter installation.

2.Removal of the existing trip devices.

3.Installation of the phase sensors.

4.Installation of the back frame harness.

Crossbar Modification

The flux shifter reset linkage is driven by the actuator bracket, as shown in Figure 3. The actuator bracket must be assembled to the left side link of the left pole, as shown in Figure 14.

If the actuator bracket mounting holes are not in the left side link, the holes must be added. Drill and tap two 5/16-18 holes using the pattern in Figure 15. A full-size template is provided in the Appendix.

Left Pole

Link

Actuator

Bracket

Figure 14. Actuator bracket attached to the left pole link.

Figure 15. Drill pattern for actuator bracket mounting holes.

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Contents Introduction Table of Contents List of Figures General Information Before InstallationRelocating and Remounting the W and X Relays Front Frame Breaker ConversionBreakers with EC or Power Sensor Trip Systems Installing the Flux Shifter AssemblyAKU-50 Breakers Only Breakers with a Side BracketBreakers 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 Crossbar Modification Back Frame ConversionAK-75 & AK-100 Breakers with SST Trip Systems Removing the Existing Trip DevicesAK-50 & AKS-50 Breakers with SST Trip Systems AK-50 & AKS-50 Breakers Installing the Phase SensorsAK-75 & AK-100 Breakers Phase sensor installation on AK-75 & AK-100 breakersConfiguring the Trip Unit Installing the Trip UnitAK-50 & AKS-50 Stationary Breakers FOUR-WIRE Ground Fault OptionInstalling the Fourth-Wire Disconnect AK-75 & AK-100 Draw-Out Breakers AK-50 & AKS-50 Draw-Out BreakersAK-75 & AK-100 back frame conversion Outline of the neutral sensor for AK-50 breakers Installing the Neutral SensorOutline of the neutral sensor for AK-75 and AK-100 breakers Equipment Conversion Installing Mounting BracketsFourth-wire disconnect for AKD-5 & AKD-6 Nuisance Tripping on Ground Fault-Equipped Breakers Testing and TROUBLE- ShootingTesting Trouble-ShootingAK-50 Page Page Appendix 1. Drill Template for Flux Shifter Mounting Appendix Drill TemplatesPage Page Page Page GE Industrial Systems