GE Removing the Existing Trip Devices, AK-50 & AKS-50 Breakers with SST Trip Systems

Page 12

Removing the Existing Trip Devices

AK-50 & AKS-50 Breakers with EC or Power Sensor Trip Systems

1.Remove and discard the two screws at the base of each trip device, as shown in Figure 16. Dis- card the metal mounting brackets.

2.Remove and discard the small Philips-head screw at the top of each trip device.

3.Remove and discard the four 5￿16" Allen-head bolts securing each trip coil. The coil can then be lifted off and removed. Figure 17 shows one trip completely removed, one with the cover removed, and one still in place.

AK-50 & AKS-50 Breakers with SST Trip Systems

Remove the existing SST phase sensors in prepara- tion for installing the new sensors.

AK-75 & AK-100 Breakers with EC or Power Sensor Trip Systems

Remove the existing trip devices and harnesses and discard.

AK-75 & AK-100 Breakers with SST Trip Systems

The new ProTrip phase sensors are visually identical to the SST sensors. Remove the existing sensors and discard.

Coil Mounting

Bolts

Cover Screws

and Clamps

Figure 16. Existing EC trip devices before removal.

Figure 17. Removal of EC trip devices.

12

Image 12
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 OnlyInstalling the Trip Paddle Adjusting the Flux ShifterBreakers with ECS or SST Trip Systems Installing the Trip Unit Mounting Bracket EC or Power Sensor Trip SystemECS or SST Trip System Trip unit mounting bracket attached to the mounting Plate Back Frame Conversion Crossbar ModificationRemoving the Existing Trip Devices AK-50 & AKS-50 Breakers with SST Trip SystemsAK-75 & AK-100 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 UnitFOUR-WIRE Ground Fault Option Installing the Fourth-Wire DisconnectAK-50 & AKS-50 Stationary Breakers 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