GE Industrial Solutions PowerVac with ML-18 or ML-18H Mechanism - Manual (Page 10)

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1 -- Closing spring gag plate
2 -- Manual charging lever
7.3—Closing Spring Gag
Insert the closing spring gag plate (item1, 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
charged for gagging, an interference angle is exposed on the
left side of the breaker (item 3, Figure 19). 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 (item 11, Figure 3).
CAUTION: FAILURE TO PUSH THE CLOSE BUTTON BEFORE
CONTINUING THE SLOW CLOSE PROCEDURE WILL CAUSE
DAMAGE TO THE MECHANISM.
After pushing the manual closing button, 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. Wipe spring 5. Lock washer 9. Clamp screws
2. Wipe indicator (ML 18 only) 6. Hexagon projection 10. Interrupter movable contact rod
3. Erosion disk 7. Operating rod insulator 11. Reference arm
4. Lock nut 8. Coupling clamp
Figure 5 Gag plate
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