Drawout Mechanism Position; Slow Closi Ng The Breaker - GE AKR-30 Series Maintenance Manual

SECTION 7-Breaker Maintenance ( Cont.)
7.3 D RAWOUT MECHANISM POSITION
Maintenance or inspection should be cond ucted with the
breaker on a workbench. The d rawout mechanism m ust be
placed i n the CONN ECT position . This will deactivate the
various i nterlocks wh ich would otherwise prevent the
mechanism or contacts from closi ng. Engage the racki ng
handle with the racking shaft and turn clockwise until it
stops.
Remember, before i nstalling the breaker back i nto its
compartment, the drawout mechanism m ust be returned to
the D I SCONN ECT position.
7.4 S LOW CLOSING TH E B R EAKER
Closing the breaker slowly, while observing the action of
the mechanism and contacts, is a good way of judging the
correctness of mechanical and contact re lationships.
Some of the maintenance procedures described later will
i nvolve operating the breaker i n th is manner. The proce­
dure for slow closing is given below.
The c l o s i n g s p r i n g m u st be i s o l ated f ro m t h e
mechanism camshaft. This is done by discon necti ng the
lower spring assembly from the mating camshaft linkage.
Remove the hex-head bolt as shown i n Fig . 2 1 . Remove
this bolt only with the mechanism i n the D ISCHA R G E D
position and the spring at its m inimum exte nsion.
FIG. 21 - SLOW CLOSI NG-LOWER S PR ING ASM HARDWAR E
20
Remove the hex-head bolt only, do not remove or loosen
the slotted head screw shown in Fig . 2 1 . Removal of the
slotted head will cause the closi ng spring to become dis­
engaged from the camsh aft with considerable force. Verify
that this screw remains tightened during the slow close
operation.
After the bolt is removed, use the maintenance handle
to rotate the ratchet assembly rol ler onto the closing
p ro p (see Charg i ng Usi n g The Mai ntenance Handle, sec­
tion 5.4). At t h i s point, the c l os i ng prop m ust be removed
by either pushing the CLOSE button on Manual breakers,
or pushi ng the closing solenoid armatu re on electric
breakers (see Fig. 1 3). When the closing p ro p i s removed,
con t i n ue turn i ng the camshaft. When the ,contacts and
mechan ism are in the fully closed position, the cam will
support the cam rol ler (refer to Fig. 10 & section 5.3) and
the contacts w i l l develop max i m um depression.
Push the TRI P button to release the mechanism and
open the contacts.
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CAUTION The mechan ism and contacts w i l l o pen
with normal speed and force.
When replac i n g the hex-head bolt, t u rn the camshaft
with the mai ntenance handle to a l i g n the m at i n g holes i n
the lower spring assembly a n d camshaft l i n kage.