GE AKR-30 Series Maintenance Manual page 212

SECTION 8-Contact Maintenance (Cont.)
8.2 CONTACT ADJUSTM ENT ­
AKR 30/30H & AKRU 30
The contact structure of the AKR 30 and the AKRU 30
breakers is slightly different from the AKR 30H. Referring to
44
Fig. A & B, both structures use one moveable contact
arm, and two stationary arcing contacts.
AKRJAKRU 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 rol ler 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 inch by turning the wipe adjustment nut shown in
Fig. 45 & 46.
4. Once the gap dimension is set, verify that the torque
requ i red to j ust turn the adjustment nut is greater than 40
in-lbs. If less torq ue is req uired, carefully add LOCTITE
220 or 290 to the adjustment nut threads.
excess LOCTITE. Once t he LOCTITE is set, recheck the
torque (value u p to 40 in.-l bs.) but do not break loose.
5. Repeat above procedure on the other pole units.
6. Trip the breaker.
FIG. 46 - WIPE ADJUSTMENT N UT-800 AMP CO NTACT STR UCTU R E
34
However, the
ADJUST GAP AT
MEASUREMENT
±
PO I N T TO
.060
PIVOT
STUD
Wipe off any
.020 "
0.250 "
-
FIG. 45 WIPE ADJUSTMENT
CONTACT STRUCTU RE
UPPER CONTACT
M EASU R E M E NT POI N T
800 AMP