ABB AKR30S-800A Installation And Maintenance Manual page 53

Figure 55
Figure 56
2TSA451009P0000 Rev-B
Circuit Breaker, Fingers (Some Details)
jamnut
yf) _- adjusting nut
m e HHss —— flat washer
797 spring
i :
SF upper retainer
SU RESSE = h PP
"ins a s
_ i | ;
LE > SS .
fe SS PS eccentric stud spacer
fis
Circuit Breaker, Fingers (Some Details)
retainer, pressure plate
: 2S"
~~ bow tie spacer
retainer clip
11.
le.
13.
14.
15.
16.
17.
18.
Using proper safety procedures and wearing required Personal Protective Equipment
(PPE), remove breaker from compartment, and place it on a solid work surface in a well-
lit location.
To uninstall the primary disconnects, remove the two nuts from one of the long bolts
holding the primary disconnect assembly together.
Carefully slide out the bolt while removing the flat washer, spring, bushing, upper
retainer, bow-tie spacers, lower retainer, and fingers from the bottom of the assembly.
Do the same for the other assembly bolt and components.
Slide off the retainer clips.
Take off the main retainer from the stud.
Slide the main retainer over the stud.
Install eccentric spacer and position spring clips on the stud.
Set a pair of bow-tie spacers into a pair of fingers, place a pressure plate retainer over
the spacers to hold them in position, and then turn the subassembly over. Hook them
into the main retainer.
. Slide a long bolt through the hole in the retainer, between the fingers, and then through
the clip and eccentric stud spacer.
Hold the bottom finger subassembly in place.
Place two fingers around the bolt from the top, hooking the fingers into the main
retainer. Then place a bow-tie spacer in each finger and hold them in position with a
pressure plate retainer.
Place a spring, bushing, and flat washer over the bolt, then secure with the two nuts.
Repeat Steps 7 through 13 for each set of fingers.
Adjust the nut to get a spacing of 0.766 - 0.797 inch between the top of the upper
retainer and the bottom of the flat washer.
Tighten the jam nut to lock in the adjustment.
Clean finger assemblies, if necessary, with a clean, lint-free rag and isopropyl alcohol or
acetone.
Be sure to apply a thin film of Mobilgrease 28 (D50HD38) to the contact areas which slide
onto the switchgear stabs (See Figure 57, Step 2). This product is available in a 1-oz tube,
ABB Part #193A1751P1.
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