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PowerVac
5kV Vertical Lift
®
Chapter 5. Operation
5-2 Close Spring Charging
Figure 13 shows a left side view of the closing
spring. The closing spring is charged and ready
to close. The closing spring charging system
consists of a closing spring mounted on the
left side of the breaker and the electrical charg-
ing system mounted on the right side of the
breaker. Both components are fastened to the
cam shaft (Figure 13, Item 2).
Figure 13. Charging & Trip system left side view
1 Closing spring
2 Cam shaft
3 Trip Solenoid
Courtesy of NationalSwitchgear.com
4 Trip return spring
5 Trip linkage
6 52 Chg & SM/LS switch
A manual charging system is provided to manu-
ally charge the breaker, or while under mainte-
nance so that the mechanism can be slow
closed and the closing spring can be charged.
(Figure 14, Item 1)
Figure 14. Manual Charging system
right side view
1 Manual charging crank
2 One way clutch
WARNING: DO NOT ATTEMPT TO MANU-
ALLY CHARGE A CHARGED BREAKER. TO
DO SO COULD DAMAGE THE CHARGING
CLUTCH AND MAKE THE MANUAL CHARG-
ING FEATURE INOPERABLE.
The manual charging system (Figure 14) works
directly on the cam shaft where a one-way
clutch (Figure 14, Item 2), driven by a manual
handle, provides rotation of the ratchet wheel.
Manual pumping of the handle advances the
ratchet wheel and the holding pawl prevents
counter-rotation while the handle is returning
for another stroke. Approximately eight com-
plete strokes of the manual handle are required
for one complete spring-charging operation.
When the spring charge indicator (Figure 1,
Item 5) shows "CHARGED", MANUAL CHARG-
ING MUST BE DISCONTINUED TO AVOID
MECHANISM DAMAGE.
19
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