Siemens-Allis FC-10008, Instructions Manual

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STORED ENERGY
OPERATOR DESCRIPTION OF OPERATION
SPRING CHARGING CYCLE
Energizatlon of the Breaker Control Circuit
will
cause the spring charging motor (1, Figure 7) to start
charging the closing springs (6, Figure 3). The spring charg·
ing motor (1) will drive the driving pawl (2, Figure 3)
through an eccentric drive shaft (3, Figure 3). The driving
pawl (2) will tum the ratchet wheel (
4,
Figure 3) counter·
clockwise one tooth at a time. The holding pawl (5,
Figure 3) will hold the ratchet in position between driving
strokes of driving pawl (2). This
charging
operation will
continue turning the ratchet wheel
(4)
counterclockwise
a tooth at a time until the closing springs (6)
are
fully
charged (dead center). The motor will drive the ratchet
wheel paat this dead center position and the closing springs
(6) will aid rotation driving the ratchet wheel and
cams
counterclockwise until spring release rollers
(8,
Figure
8)
on the inside surfaces of cams (7, Figure 7) engage the
close latch (9, Figure 7). This arrests the motion of the
ratchet wheel (4) and the cams (7) and holds the operator
in a Cully charged position.
As
the
cams
and ratchet wheel
go over center, the motor cutoff switch (10, Figure 3) is
actuated to de-energize the spring charging motor (1).
The spring charging motor then coasts to
a
stop, driving
pawl (2) oscillating freely in the smooth toothless section
of the ratchet wheel.
The motor cutoff switch (10) has four functions:
1. It de-energizes the spring charging motor (1);
2. It opens
a
contact in the anti-pump relay circuit;
3. It sets up the closing coil circuit;
4. It
can
be used to energize an indicating light to
Indicate that the closing springs (6)
are
fully charged.
NOTE
The
close
latch check switch
116,
Figure
3)
is
in the motor
circuit.
The close latch
check
sw
i
tch monitors the position of the
close latch
(9)
and will prevent charging of the cl
o
s
in
g
springs
(6)
electrically unless the close latch (9)
is in the correct position.
As energy is stored in the closing springs, the
four bar linkage
(
1
2
,
Figure 7)will
be
positioned
by the linkage reset spring (11, Figure 7) which
acts to cause cam follower rollers (14, Figure 7)
to follow the surface of cam (7, Figure 7)
until the links are in
a
reset position, and allow·
-11·
ing latch rollers
(20,
Figure 7) to be positioned
in
fr
o
nt of trip latch (18, Figure 7).
See Figure 4 for sequence of operation.
RECLOSING CONTROL (Optional
•
For Reclosing Appli·
cations Only )
The electronic solid state time delay module works in
concert with the trip latch sensor system. The time delay
module consists of
U1
electronic timer and an electro·
magnetic relay. The diagram (Figure 9), shows the timer
module receiving power between terminals 1 and 3. Tar
·
minal 3 is connected to the common side of the closing
control source. Terminal 1 is connected to the hiCh side of
the closing control source through auxiliary contact (528)
and the closing source contact "CSC". The trip latch sensor
system consists of the magnetic actuator and the Hall effect
switch.
The time delay module Is not energized until the
breaker is charged, open and the closing source switch
"CSC" is closed. With the latch reset at the instant "CSC"
closes, the timer modules internal relay with normally
open contact operates with no intentional delay (40ms
electro-mechUlical delay) to connect the spring release
solenoid through timer module terminal 2 to the high side
of the closing source initiating the breakers closing sequence.
If at the time the closing source is applied, the trip
latch is not reset, the timer module will assume a delaying
mode of operation. Upon latch reset a predetermined delay
will be imposed before the timer's relay closes energizing
the spring release solenoid. The complete trip latch check
system is not affected by broad variation of closing source
voltage.
The time delay error caused by temperature
extremes of -40° to 65°C is a minus 3% to plus 5%.
BREAKER CLOSING CYCLE
Energizing the spring release solenoid (13, Figure 7)
will drive the close latch (9, Figure 7) away from the spring
release rollers
(8,
Figure
8)
on the cams (7, Figure 7) re·
leasing the stored energy in the closing springs (6, Figure 7).
The closing springs (6) will drive the ratchet wheel (4,
Figure 3) and the cams (7, Figure 7) counter-clockwise at a
high rate of speed. The cams (7} will engage the cam
follower rollers (14, Figure 7) of the four bar linkage
(12, Figure 7) and drive them forward causing the four bar
linkage to become straight.
As
the four bar linkage (12)
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