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Патент USA US2409011

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Oct. 8, 1946.
H. BANY
2,409,010
AUTOMATIC CONTROL EQUIPMENT
Filed Ma'rch 27, 1943
Inventor‘:
Herman Bang,’
”
a.‘
' b9 j/mtm
2,409,010
Patented Oct. 8, 1946
UNITED STATES PATENT OFFICE.
2,409,010
AUTOMATIC CONTROL EQUIPMENT
Herman Bany, Lansdowne, Pa., assignor to Gen
eral Electric Company, a corporation of New
York
Application March 27, 1943, Serial No. 480,776
10 Claims. (01. 17’1_119')
1
2
My invention relates to automatic control
its position corresponding to the minimum volt
.- equipments and particularly to equipments for
age of the generator 2 so that the rheostat con
tacts I4 are closed. As soon as the circuit breaker
controlling the voltage of a load circuit in differ
3 closes, a circuit is completed for a master relay
ent predetermined manners during di?erent por
I6 and a signal lamp I1, which, when lighted, in
tions of a predetermined time interval.
dicates that the processing cycle is in operation.
During certain processing cycles, such for ex
The energization of the master relay I6 effects
ample as the anodizing process in which the re
the closing of the ?eld switch I0 and initiates the
sistance of the load circuit increases with the
operation of suitable control devices to cause the
length of time the circuit is energized, .it is es
sential that the voltage supplied to the load cir 10 rheostat II to be adjusted gradually in such a
manner as to increase the generator voltage at a
cuit shall vary in a predetermined manner during
predetermined rate from its minimum value to a
a predetermined portion of the processing cycle
predetermined maximum value. This result is ac
and in a different manner during another portion
complished by periodically completing, by means
of the cycle, and one object of my invention is to
provide an improved arrangement of apparatus 15 of a suitable interrupter I8, an energizing circuit
for the driving motor N3 of the rheostat l I so that
for accomplishing such a result.
the motor I9 is intermittently rotated a predeter
In the particular embodiment of my invention
mined amount in a direction to effect an increase
shown in they drawing, I have illustrated an im
in the voltage of generator 2. When the gen
proved arrangement of apparatus for gradually
increasing the voltage across a load circuit from 20 erator voltage has been increased to the desired
maximum value, a voltage relay 20 which is con
a predetermined minimum to a predetermined
nected across the load circuitI operates and
maximum value at a predetermined rate and for
effects the operation of a control relay 2| which
maintaining the voltage at said maximum value
in turn removes the control of the rheostat II
for a predetermined time after the voltage
reaches the predetermined maximum value.
25 from the interrupter I8 and places it under the
control of the voltage relay 20 so that thereafter
My invention will be better understood from
the rheostat II is adjusted in such a manner as
the following description when taken in connec
to maintain the voltage of the generator 2 at the
tion with the accompanying drawing, the single
desired maximum value. When the load circuit
?gure of which diagrammatically illustrates a di
rect current generator voltage control equipment 30 voltage is above the desired maximum value after
the relay 2| has been picked up, the relay 2c
embodying my invention, and its scope will be
completes an energizing circuit for a, control re
pointed out in the appended claims.
Referring to the accompanying drawing, l rep
resents a direct current load circuit which is ar
lay 22 which in turn completes an energizing cir
cuit for the motor I9 so as to cause it to rotate
ranged to be supplied with current from a direct 35 in a direction to decrease the generator voltage,
whereas when‘ the load circuit voltage decreases
current generator 2. A circuit breaker 3 is pro
below the desired maximum value, the voltage
vided for connecting the generator 2 across the
relay 20 completes an energizing circuit for a
load circuit I. As shown in the drawing, the
control relay 23 which in turn completes an ener
circuit breaker 3 is of the latched closed type
having a closing coil 4 which, when energized, 40 gizing circuit for the motor I9 so as to cause it
to rotate in a direction to increase the voltage of
closes the circuit breaker and a trip coil 5 which,
the generator 2. After the voltage of the ‘gen
when energized, releases a holding latch 6 to
erator 2 has been maintained at the desired
effect the opening of the circuit breaker. The
maximum value for a predetermined time, a time
generator 2 is provided with a ?eld winding 8
which is arranged to be connected to a suitable 45 relay 26, which is set into operation by the con
trol relay 2| picking up, completes its timing op
source of excitation 9 by means of a ?eldswitch
eration and closes a circuit for a control relay
ID. A motor operated rheostat II is provided in
25 which in turn effects the lighting of a signal
series with the ?eld winding 8 so that the volt
lamp 25 to notify the attendant that the process
age of the generator 2 may be varied over a pre
determined range by adjusting the rheostat II. 60 ing cycle has been completed. ‘Also, the control
relay 25 is arranged to effect the opening of the
The circuit breaker 3 is arranged to be closed in
circuit breaker 3 and to prevent its reclosure
response to the closing of the contacts I2 of a
until after the control switch 13 has been man
suitable control device ‘I3, shown as a manually
ually operated so as to open its contacts I2. ,
controlled switch, it at'the time the contacts I2
In order to protect the generator 2 against
are closed the motor operated rheostat II is in 55
3
2,409,010
overload, a suitable overcurrent relay 28 is con
nected in series with the generator 2 and is ar
ranged to e?ect the opening of the circuit breaker
3 and the energization of a control relay 29 in
response to the generator current exceeding a
predetermined value. The control relay 29, when
4
deenergized in response to a subsequent opening
of the contacts 48 of the control relay 22.
The closing of the contacts 53 of the relay 2|
completes a circuit for the rheostat motor l9
through the contacts 39 of the relay IS, the con
tacts 5| of the relay 22, the contacts 52 of the
in its operated position, e?ects the lighting of
rheostat H, the ?eld winding 53, and the arma~
an indicating lamp 30 and the completion of a
ture winding 45 of the motor If? so that the rheo
locking circuit for the relay 29 which can be
stat motor is rotated in a direction to decrease
interrupted only by the operation of an asso 10 the generator voltage. When the voltage of the
ciated manually controlled switch 3|. Also, when
load circuit | decreases so that the contacts 54
it is in its operated position, the control relay 29
of the voltage relay 23 are closed, an energizing
is arranged to prevent the control switch I3 from
circuit is completed for the control relay 23
completing the energizing circuit for the closing
through the contacts 39 of the relay l6. The
coil 4 of the circuit breaker 3.
closing of the contacts 55 of the control relay 23
The operation of the control arrangement
completes through the contacts 55 of relay 2|
shown in the drawing is as follows. The various
control devices are shown in the positions which
they occupy when the generator 2 is not in op
eration. When it is desired to start the proces
sing cycle, the generator 2 is brought up to its
operating speed in any suitable manner, not
shown in the drawing, and then the control
a shunt circuit around the contacts 43 of the
relay 2| and the interrupter l8 so that the rheo
stat motor I9 is operated continuously in a di
rection to increase the voltage of the generator
2. Therefore, while the control relay 2| remains
in its energized position, the rheostat Ii is con
trolled so as to maintain the generator voltage
switch I3 is operated so that its contacts |2 are
at the desired maximum value.
closed to complete an energizing circuit for the
The closing of the contacts 55 of control relay
closing coil 4 of the circuit breaker 3 through the
2| completes an energizing circuit for the time
contacts 33 of the relay 29, the contacts I4 of the
relay 24 through the contacts 39 of the relay
rheostat II which are closed when the rheostat
It so that after the desired maximum voltage
is in its minimum voltage position, the contacts
has been maintained for a predetermined time,
34 of the relay 25, and the contacts 35 of the 30 the time relay 24 closes its contacts 57 and corn
relay IS. The closing of the main contacts of
pletes an energizing circuit for the control relay
the circuit breaker 3 connects the unexcited gen‘
25 through the contacts 56 of the relay 2! and
erator 2 across the load circuit |, and the closing
the contacts 39 of the relay It‘. The closing of
of the auxiliary contacts 33 of the circuit breaker
the contacts 58 of the relay 25 completes an en
3 completes circuits for the master relay I6 and
ergizing circuit for the trip coil 5 of the circuit
the signal lamp |'| through the contacts 33 of the
breaker 3 through the auxiliary contacts 59 of
relay 29, the contacts l2‘ of the control switch
the circuit breaker so that the circuit breaker
I3, and the contacts 31 of the rheostat II. By
3 opens to terminate the processing cycle. The
closing its contacts 38, the relay l6 completes a
closing of the contacts 55 of the control relay 25
shunt circuit around the contacts 3? so that the 40 completes a circuit for the indicating lamp 25,
relay l5 remains energized and the lamp l1 re
the lighting of which informs the operator that
mains lighted when the rheostat H is subse
the processing cycle has been completed. The
quently moved out of its minimum voltage posi
tion. ‘By closing its contacts '39','the relay l6
completes an energizing circuit for the closing
coil 43 of the ?eld switch In so that the generator
?eld winding 8 ‘and the adjustable rheostat H
are connected in series across the source of exci
tation 9. The closing of the contacts 33 of the
relay l3 also completes through the contacts 4|
of the relay 2| an operating circuit for the motor
42 which drives the interrupter l3 and also com
pletes an operating circuit for the motor I9 of
the rhecstat H which is periodically completed
through the contacts 43 of the relay 2 I, the inter
rupter l8, the auxiliary contacts 43’ of the rheo
stat H, the ?eld winding 44, and the armature
winding 45 of the motor l9. This operating'cir
closing of the contacts 6| of the relay 25 com
plctes a locking circuit for the relay 25 through
the contacts i2 of the control switch i3 and the
contacts 33 of the relay 29. Therefore, the con
trol relay 25 remains energized and the indicat
ing lamp 26 remains lighted until the operator
manually operates the control switch I3 so as to
open its contacts |
.
rI‘he opening of the auxiliary contacts 36 of the
circuit breaker 3 interrupts the heretofore de
scribed energizing circuit of the master relay l6
which in turn, by opening its. contacts 39, inter
rupts the energizing circuits of the relays 2| to
'24, inclusive, so that all of these relays ‘are de
energized. The closing of the contacts '62 of the
master relay |5 completes an energizing circuit
for the rheostat motor l9 through the contacts
cult for the motor | 9 causes the rheostat I I to
be operated periodically in such a manner as to 60 52 of the rheostat H, the field winding 53, and
increase the generator voltage at a predeter
the armature winding $5 of the motor |9 so that
the motor operates continuously in a direction
mined rate until the generator voltage reaches a
to restore the rheostat | | to its minimum voltage
predetermined value when the voltage relay 20
picks up and closes its contacts 41 thereby com 65 position, in which position the contacts 52 are
open and the contacts i4 and 37 are closed. The
pleting an ‘energizing circuit for the control re
closing of the contacts 24 of the rheostat ||,
lay 22 through the contacts 39 of the relay |6.
before the control switch i3 is operated by the
By closing its contacts 48, the relay 22 completes
operator
to open the contacts l2, does not re
an energizing circuit for the control relay 2|
through the contacts 39 of the relay IS. By 70 establish an energizing circuit for the closing coil
4 of the circuit breaker 3 because this circuit is
opening its contacts Al and 43, the control relay
open at the contacts 34 cf the energized control
2| renders the interrupter l8 inoperative to cone
relay 25 until the contacts ii.’ are opened. Be
trol the operation of the rheostat | l, and by clos
fore the operator can initiate another processing
ing its contacts 49, the relay 2| completes a look
cycle, it is evident that he must ?rst move the
ing circuit for itself so that it does not become ' control switch l3 so as to open the contacts l2
v5
minimum source voltage for effecting the inter
mittent operation of said rheostat to gradually
and thereby effect the deenergization oi the con
trol relay 25.
>
‘
The operator can stop the processing cycle at
any time merely by operating the control switch
increase. said source voltage so that it reaches a
cuit breaker
voltage at said predetermined value, signalling
predetermined value at the expiration of a pre
i3 so as to open its contacts l2 and close its con CL determined interval after the operation of said
device, means responsive to said source voltage
tacts 53 thereby completing an energizing circuit
reaching said predetermined value for thereafter
for the trip coil 5 through the contacts 330i the
controlling said rheostat to maintain said source
relay 29 and the auxiliary contacts 59 of the cir
3. . The opening ~of the circuit
breaker 3 then effects the deenergization of the 10 means, and timing means responsive to ‘said
source voltage reaching said predetermined value
master relay I6 and of the controlrelays 2| to
for effecting the operation 01"; said signalling
24, inclusive, and the restoration ofthe rheostat
means after said source voltage has been main
l I to its minimum voltage positionin the manner
tained at said predetermined value for a prede
termined time.
‘
In case the generator 2 becomes overloaded
3. In combination, a source of current having
while it is supplying current to the load circuit I,
a ?eld winding, an adjustable ?eld rheostat con
the overcurrent relay 28 closes its contacts 64 and
heretofore
described.
.
‘
-
>
completes an energizing circuit for the‘trip coil
5 to effect the opening of the circuit breaker 3.
The opening of the circuit breaker 3 then effects
the deenergization of the relays l6 and 20 to 24, -
trolling the excitation of said ?eld winding to
control the voltage of said source, a control de
vice, means responsive to said control device be
ing in a predetermined position while said rheo
stat is in a position to e?ect a predetermined
minimum source voltage for effecting the inter
mittent operation of said rheostat to gradually
inclusive, and the restoration of the‘rheostat II
to its minimum voltage position in ‘the manner
heretofore described. The closing of the con
tacts 65 of the overcurrent relay 28 completes an 25 increase said source voltage so that it reaches a
predetermined value at the expiration of a pre
energizing circuit for the control relay 29 which,
determined interval after the operation of said
by closing its contacts 66, completes a locking cir
device, means responsive to said source voltage
cuit for itself through the contacts 61 of the
reaching said predetermined value for rendering
manually controlled switch 3|. The closing of
the contacts 68 of the relay 29 completes a circuit 30 inoperative said'intermittent varying means for
said rheostat and thereafter controlling said
for the indicating lamp 3!], the lighting of ‘which
rheostat to maintain said source voltage at said
informs the operator that the circuit breaker 3
predetermined value, signalling means, and tim
has ‘been opened and the processing cycle has
ing means responsive to said source voltage reach
been terminated by an overload on the generator
2. The opening of the contacts 33 of the relay 35 ing said predetermined Value for effecting the
operation or said signalling means after said
29 prevents the circuit of the closing coil 4 from
source voltage has been maintained at said pre
being re-established until after the operator has
determined value for a predetermined time.
operated the control switch 3| in such a manner
4. In combination, a source of current having
as to open the contacts 61.
While I have,- in accordance with the patent 40 a ?eld winding, an adjustable ?eld rheostat for
cont-rolling‘the excitation of said ?eld winding
statutes, shown and described my invention as
applied to a particular system and as embodying
to control the voltage of said source over a pre
various
devices
diagrammatically
indicated,
changes andv modi?cations will be obvious to
those skilled in the art, and I therefore aim in e
the appended claims to cover all such changes
and modi?cations as fall within the true spirit
and scope of my invention.
What I claim as new and desire to secure by
Letters Patent of the United States is:
determined range, a control device, means re
sponsive to said control device being in a prede
termined position while said rheostat is in its
position corresponding to the minimum voltage
in said range for e?ecting the operation of said
rheostat to effect an increase in said source volt
age over said range at a predetermined rate, and
means responsive to said source voltage being
raised to the maximum voltage in said range for
1. In combination, a source of current having
rendering said ?rst mentioned means inoperative
a ?eld winding, an adjustable ?eld rheostat con
trolling the excitation of said ?eld winding to con
and for thereafter controlling said rheostat to
maintain said source voltage at said maximum
trol the voltage of said source, a control device,
means responsive to said control device being in a 55 voltage.
predetermined position while said rheostat is in
5. In combination, a source of current having
a position to effect a predetermined minimum
a ?eld winding, a load circuit, switching means
source voltage for effecting the operation of said
for connecting said source to said circuit, an ad
justable ?eld rheostat for controlling the excita
rheostat so as to effect an increase in said source
voltage at a predetermined rate, means responsive 60 tion of said ?eld winding to control the voltage
of said source over a predetermined range, means
to said source voltage being raised to a prede
controlled by said rheostat for permitting said
termined value by said ?rst mentioned means for
switching means to connect said source to said
thereafter controlling said rheostat to maintain
circuit only when said rheostat is in its position
said source voltage at said predetermined value,
timing means responsive to said source voltage 65 corresponding to the minimum voltage in said
range, a control device, means jointly controlled
reaching said predetermined value, and signal
by said device and said switching means and said
ling means controlled by said timing means after
rheostat for e?ecting the operation of said rheo
it has been in operation for a predetermined time.
stat to effect an increase in said source voltage
2. In combination, a source of current having
a ?eld winding, an adjustable ?eld rheostat con
over said range at a predetermined rate in re
sponse to said control device being in a predeter
trolling the excitation of said ?eld winding to
mined position while said switching means is
control the voltage of said source, a control de
‘connecting said source to said circuit and said
vice, means responsive to said control device be
rheostat is in its position corresponding to the
ing in a predetermined position while said rheo
stat is in a position to effect a predetermined 75 minimum voltage in said range, and means re
7
2,409,010
sponsive to said source voltage being raised to the
maximum voltage in said range for removing the
control of said rheostat from said jointly con
trolled means and for thereafter controlling said
rheostat to maintain said source voltage at said
maximum voltage.
8
said source, means for causing said voltage ad
justing means to gradually raise said voltage up
to a predetermined value, relay means respon
sive to the voltage value of the source to stop the
‘ raising of the voltage and thereupon to regulate
the voltage within predetermined limits.
6. In combination, a source of current having
a ?eld winding, a load circuit, switching means
for connecting said source to said circuit, an ad
8. In combination, a source of current having
a ?eld winding, means for controlling the excita
tion of said ?eld winding to adjust the voltage of
.iustable ?eld rheostat for controlling the excita 10 said source, means for causing said voltage ad
tion of said ?eld winding to control the voltage
justing means to gradually raise said voltage up
of said source over a predetermined range, means
to a predetermined value within a predetermined
controlled by said rheostat for permitting said
time, relay means responsive to the voltage value
of the source to stop the raising of the voltage
circuit only when said rheostat is in its position 15 and thereupon to regulate the voltage within
corresponding to the minimum voltage in said
predetermined limits.
range, a control device, means jointly controlled
9. In combination, a source of current having
by said device and said switching means and said
a field winding, a load circuit. means for con
rheostat for effecting the operation of said rheo
necting the source to the load, means for con
stat to effect an increase in said source voltage 20 trolling the excitation of said ?eld winding to ad
over said range at a predetermined rate in re
just the voltage of said source, means for causing
sponse to said control device being in a predeter~
said voltage adjusting means to gradually raise
mined position while said switching means is com
said voltage up to a predetermined value, relay
necting said source to said circuit and said rheo
means responsive to this voltage drop to stop the
stat is in its position correspondng to the mini 25 raising of the voltage and to thereupon regulate
mum voltage in said range, means responsive to
the voltage within predetermined limits, and time
said source voltage being raised to the maximum
delay responsive means to disconnect the source
voltage in said range for removing the control of
from the load circuit after a predetermined time.
said rheostat from said jointly controlled means
10. In combination, a source of current having
and for thereafter controlling said rheostat to 30 a ?eld winding, a load circuit of varying resist
maintain said source voltage at said maximum
ance dependent upon the length of time it has
voltage, means for effecting the operation of said
been energized, means for connecting the source
switching means to disconnect said source from
to the load, means for controlling the excitation
said circuit, and means controlled by said switch
of said ?eld winding to adjust the source voltage
ing means when it is in a position to disconnect 35 in a manner to hold the current below a pre
said source from said circuit for effecting the op
determined value, relay means responsive to a
eration of said rheostat to its position corre
predetermined value of the source voltage to stop
sponding to the minimum voltage in said range.
the raising of the source voltage and to maintain
7. In combination, a source of current having
such voltage thereafter within predetermined
a ?eld winding, means for controlling the excita 40 limits.
tion of said ?eld winding to adjust the voltage of
HERMAN BANY.
switching means to connect said source to said
Certi?cate of Correction
‘out No. 2,409,010.
October 8, 1946.
HERMAN BANY
It is hereby certi?ed that error appears in the printed speci?cation of the above
numbered patent requiring correction as follows: Column 8, line 24, claim 9, for the
word “drop” read value; and that the said Letters Patent should be read with this
correction therein that the same may conform to the record of the case in the Patent
O?ice.
Signed and sealed this 8th day of April, A. D. 1947.
[w]
LESLIE FRAZER,
First Assistant ?om/mz'ssioner of Patents.
Certi?cate of Correction
‘ int N0. 2,409,010.
October 8, 1946.
HERMAN BAN Y
It is hereby certi?ed that error appears in the printed speci?cation of the above
numbered patent requiring correction as follows: Column 8, line 24, claim 9, for the
word “drop” read value; and that the said Letters Patent should be read with this
cofl?rection therein that the same may conform to the record of the case in the Patent
0 ce.
Signed and sealed this 8th day of April, A. D. 1947.
[m]
LESLIE FRAZER,
First Assistant G'onvmz'ssz'oner of Patents.
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