Siemens-Allis FC-10008, Инструкция по эксплуатации

Страница: 33 / 80

Closing Circuit
The standard control circuit for a stored energy
operator is shown in Figure 9. When the close control
switch is closed, the circuit from terminal 7 through 88·2
and 52Y1 to 52B through trip latch timer, Figure 14 (when
furnished), to terminal 6 energizes the closing coil, closing
the breaker. N. soon as the closing springs are discharged,
and 88·3 switch contact closes to energize the 52Y relay.
If the close control switch remains closed, the 52Y relay
remains picked up through contact 52Y2. Control switch
has to be released
to
reset control for another closing opera·
tion.
This Corms the anti-pumping relay circuit which
prevents the circuit breaker from reclosing immediately
after a trip free operation. It control power is momentarily
lost during closing, upon re�mergization,
the
52Y relay
picks up Instantaneously through contact 88·3 maintaining
the anti-pumping relay circuit prior to complete spring
charging.
Close Latch- Mechanical and Electrical lnterlockl
The close latch (9, Figure 3) must be fully reset to
receive the cam mounted spring release rollers at the end of
the charging cycle. To insure the close
latch
is in this Cully
reset position, an electrical and mechanical interlock is
provided.
·
The close latch check switch (16, Figures 3 and 17)
consists of snap-action type switch mounted in close prox·
imlty
to the close latch. A striker plate at the tail of the
close latch engages the switch's acuator sllgbtly before tbe
fully reset position is achieved and actuates the switch prior
to
the latches reaching the fully reset position. At the time
of actuation, a contact closes initiating the charging se­
quence. The switch operates with very small differential,
and this sensitivity coupled with the close latch biased
engagement of the spring release rollers provides a positive
sensitive interlock.
The mechanical interlock (Figures 19) preventS manual
charging of the breaker if the close latch is not adequately
reset. A linkage attached by a clevis to the close latch,
extends down the side of the breaker frame to the driving
pawl mechanism.
An extension of the interlock linkage
passes above the driving pawl constant force return spring.
If the close latch fails to return to a fully reset position, the
linkage extension thrusts the driving pawl's return spring
downward preventing the driving pawl's engagement of the
ratchet wheel, thus mechanically inhibiting either manual
or electrical spring charging.
ADJUSTMENTS
Adjustments are factory set and checked before and
after numerous mechanical operations on every breaker to
insure correctness. No adjustment checking should be neces·
sary on new breakers. If a malfunction occurs, check for
hidden
shipping damage.
The following will help you make the correct ad·
justments when replacing a broken or worn part.
CIRCU I T BREAKE R TIM ING
A comparison of circuit breaker timing at any period
of maintenance with that taken when the breaker was new
will indicate the operational condition of the breaker
mechanism. A time variance of more than 1/2 cycle (8.3
ms)
on opening and 2 cycles (33.3 ms) on closing indicates
a maladjustment or friction buildup. A speed analyzer may
be connected to the movable contact
arm
by removing one
button head socket screw in the movable contact arm (Item
29, Figure llA).
·15·
PHASE BAR R I E R ASSEMBLY
Barriers of high dielectric flame retardant material
isolate each phase (Figure 10). To remove interphase
barriers (1) and flux shunts (2), remove screws (6), lateral
supports (5), front barrier (7), rear barrier (4) and outer
barrier (3). Flux shunts (2) should be pulled out first
towards the rear of the breaker before Interphase barriers
(1) can be removed.
CAUTION
Each flux shu nt (21 weighs about 90 pounds
and should be handled accordi ngly.
Hand holes
are
provided in the flux shunt packages
(2) for lifting advantage when sliding them in and out of the
breaker.
www
. ElectricalPartManuals
. com