GE Industrial Solutions Power-Vac ML-20 Mechanism User Manual

Page 10

Figure 5 Gag plate installation

1 Closing spring gag plate

2 Manual charging lever

7.3—Closing Spring Gag

Insert the closing spring gag plate (1, Figure 5) by opening the

closing spring gag hole cover and inserting the tip of the gag

plate between the end of the spring and the spring guide and

engaging the détentes on the gag plate into the slots in the
closing spring guide. Note that when the closing spring guide

is exposed for gagging, an interference angle is exposed on

the left side of the breaker (1, Figure 17). With the closing

spring in the gagged position, this angle will provide

interference preventing use of the lift truck and racking of the

breaker element. No attempt should be

made to alter, modify or otherwise make inoperative this

safety feature. With the gag plate in position, depress the
manual close button. This action will partially discharge the

closing spring and also partially close the vacuum interrupter

contacts. Do not energize the secondary control circuit at this

time.

7.4—Slow Closing

To manually slow close the breaker contacts, install the

closing spring gag, as described above, and push the manual

close button (11, Figure 3). Then put the manual charge

handle on the manual charge lever and move the handle up
and down. The breaker will be fully closed when the spring

charge indicator shows “CHARGED”.

CAUTION: WITH THE GAG PLATE INSTALLED, THE

BREAKER CLOSED, AND OPENING SPRINGS CHARGED, THE
BREAKER CAN BE TRIPPED AT FULL SPEED.

7.5—Gag Plate Removal

To remove the gag plate, the closing spring must be fully
charged. If the spring charge indicator does not show

“CHARGED” in the window, manually charge the spring until

it does. Lift up and push in on the gag plate to clear the

détentes on the gag plate from the slots in the closing spring

guide. While holding the gag plate up, remove it from the

opening. Close the gag hole cover. For safety, first close the
breaker by depressing the manual “CLOSE” button and then

depress the manual “TRIP” button. All stored energy is now

removed from the breaker.

Figure 6 Operating rod assembly

1. Erosion Marker

4. Hexagon projection

7. Clamp screws

2. Lock nut

5. Operating rod insulator

8. Interrupter movable contact rod

3. Lock washer

6. Coupling clamp