Contact Adjustment; Akr 30/30H & Akru - GE AKR-30 Series Maintenance Manual

SECTION 8-Contact Maintenance (Cont.)
8.2 CONTACT ADJUSTM ENT -
AKR 30/30H & AKRU
The contact structure of the AKR 30 and the AKRU 30
breakers is s lightly different from the AKR 30H. Referring to
Fig. 44 A & B, both structures use one moveable contact
arm, and two stationary arcing contacts.
AKR/AKRU 30 uses three stationary main contacts and the
AKR 30H uses four.
The following wipe adjustment procedure is appl icable
to all AKR-30/30H & AKRU-30.
1 . Open the breaker, remove arc quenchers.
2. Slow-close the breaker. The cam roller must be sup-
ported by the cam and not the prop. Refer to section 5.3.
3. Select one pole and, using a flat or wire feeler gage,
measure the gap between the top contact and its pivot stud
45.
as shown in Fig. As necessary, adjust the gap to 0.060
±
0.020 i nch by turning the wipe adjustment nut shown i n
Fig. 45 & 4 6 .
4 . Once the gap dimension is set, verify that the torque
required to j ust turn the adjustment nut is greater than 40
If less torque is req u i red, carefu lly add LOCTITE
in-lbs.
220 or 290 to the adjustment nut threads.
excess LOCTITE. Once the LOCTITE is set, recheck the
torque (value u p to 40 in.-l bs.) but d o not break loose.
5. Repeat above procedure on the other pole units.
6. Trip the breaker.
FIG. 46
-
34
30
However, the
Wipe off any
WIPE ADJUSTMENT N UT-800 A M P CONTACT STR UCTU R E
ADJUST GAP AT
MEASU R E M ENT
±
POINT TO
.060 .020 "
t
PIVOT
STUD
FIG. 45 - WIPE ADJUSTMENT 800A EXCEPT
AKR 30L AMP CONTACT STRUCTURE
0.250 " M EASU R E M E N T POI NT