ML20024B788

Procedure IB-8307, Instructions for Installation of Close Latch Anti-Shock Spring in Hk Mechanism (Used in Breakers Less than 1,000 Mva).

ML20024B788
Person / Time
Site:	LaSalle, 05000000
Issue date:	04/28/1983
From:	BBC BROWN BOVERI, INC. (FORMERLY BROWN BOVERI CORP.
To:
Shared Package
ML20024B778	List: ML20024B777 ML20024B784 ML20024B788
References
IB-8307, NUDOCS 8307110381
Download: ML20024B788 (3)

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INSTRUCTIONS FOR INSTALLATIO!1 0F CLOSE LATCH A.*iTI-SHOCK SPRI"G IN HK MECHA:ilSM (USED IN BREAKERS LESS THAN 1CCO M','A)

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BBC sa.w e INSTRUCTIONS FOR INSTALLATION .

OF CLOSE LATCH ANTI-SHOCK SPRING IN HK ME MANISM (USED IN BREAKERS LESS THAN 1000 MVA)

1. GENE RAL 1.1 For general circuit breaker instructions refer to the appropriate 3r:wn Boveri Instruction Bulletin.

.. 1.2 The breaker must be removed from the switchbeard.

1.3 Since the spring is to be installed en the underside of the breaker, the breaker must either:

1.3.1 Be lifted off the floor a sufficie.: distance, and supported for safety, so there is access to tr.e ur.derside.

1.3.2 Recove the barriers and ar chutes so the breaker can be turned on its side or back for ac: ass :: the underside.

(See par. 3.3 before positioning the breaker en its back) 1.4 The breaker closing springs can be charged electri; ally or mechanicaily, but if charged electrically, the toggle swi :" sh:ald be turned off after each charge operation.

2. PARTS RECU: RED .

Cne (1) spring 15237t-A One (1) cetter pin 53113-F5 -

3. INSTALLATION 3.1 Position the breaker for access to the un:erside ;er 1.3.1 en 1.3.2 above.

• 3. 2 Charge the closing springs and install the sica ciese bracket per the appropriate breaker instruction bulletin. Full the manual ciese lever to discharge the springs to partially close the breaker.

3. 3 Manually trip the breaker. Check at the undersice of the mechanism that the closing springs are "UP" so that the 1" cia. pin X a 7/5" long with cotter pins at each end can te coved cut : clear the close spring. With the breaker in some positions, particularly on i s back, the crank at the hex. shaft will sometimes rotate too far when the manual tri; is cade after the slow close which prevents the 1" dia. pin frc: clearing the close sprir.g~.

If this condition exists, see 3.4 3.4 Do this operation only if the 1" dia, pin will not clear the close spring as described in 3.3. Repeat the . slow close 0:erati:n but before pushin; the manual trip an approximate'iy 3/a X 1 X 9 in. long wood bicck should be temporarily installed to prevent evertravel cf the closin; springs. This block is placed vertically, between the truck and the closing spring crank, :

the motor side of the breaker, and taped tempcrarily to hold in place. The springs will now hold in the "UP" position when the breaker is manually tri;:

Make sure to recove the wood block after installing the close latch anti-shock spring.

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BBC na> c.w 3.5 Viewing the mechanism fr a the rear, re=cve the right (actor side) side cotter pin in the 1" dia. X 4 7/8" long pin. Tap the pin lightly tooard the left approximately 1 1/2" until the 13/15 long X 1 1/8~ dia. bushing on the pin can be remcved.

3.6 Install the close latch anti-shock spring with the s: ring hcok tooard the rear of the breaker, the "L" shaped end of the spring en the top of the 3/a dia. X a 7/8 long pin with the 15/5 lone spring end toward the mctor side and the.ccil' spring over the 13/8 dia. hub of the cicse latch. The final step is-to push the hook end of the spring up and toward the left to hook over the 1/4" wide close latch.

3.7 While holding the 13/16 long bushing in place, tap the 1" dia, pin.back to its original pcsition. Install a new cetter pin.

3.5 Remove the wood block if it was installed per par. 3.4 3.9 Ccmplete the slow close operation by c:mpleting the manual charge cperation.

Remove the slow close bracket.

3.10 Close and trip the breaker seve'ral times :: cne:k its Operation.

3.11 Repcsition the breaker en the fic~or in its nor al ::siticn.

3.12 If recoved, reinstall the ar: chutes and barriers ;er tne appropriate breaker instruction bulletin. -

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