US3500394A - Control apparatus - Google Patents

Control apparatus Download PDF

Info

Publication number
US3500394A
US3500394A US604382A US3500394DA US3500394A US 3500394 A US3500394 A US 3500394A US 604382 A US604382 A US 604382A US 3500394D A US3500394D A US 3500394DA US 3500394 A US3500394 A US 3500394A
Authority
US
United States
Prior art keywords
line
scr
current
zener diode
diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US604382A
Other languages
English (en)
Inventor
Sanford E Egesdal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell Inc
Original Assignee
Honeywell Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honeywell Inc filed Critical Honeywell Inc
Application granted granted Critical
Publication of US3500394A publication Critical patent/US3500394A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B23/00—Alarms responsive to unspecified undesired or abnormal conditions

Definitions

  • An alarm device having a central station, a remote station, adapted to be interconnected by a supervised line in which the line is terminated at the remote station by a Zener diode connected across the line.
  • a supervisory current normally flows through the line and a change in this current from a normal value is effective to actuate an alarm at the central station.
  • a multizone alarm system having at a central or supervisory station individual zone responsive circuits 10, 11 and 12 and a common circuit 13.
  • a source of AC is converted to DC by rectifier 14 and smoothed by filter 15 to provide a filtered positive DC potential on conductors 16 and 17 with respect to common negative conductor 20.
  • the output of rectifier 14 is connected by way of a normally closed reset switch, a junction 19, and a rectifier 18, which rectifier normally is bypassed by a jumper, to the filter 15 and conductor 16.
  • Conductor 17 is connected at junction 19.
  • the conductor 16 is connected through a Silence switch and a resistor 21 to the anode of a current switching SCR the cathode of which is connected to negative conductor 20.
  • resistor 21 In parallel with resistor 21 is a serially connected diode 22 and Buzzer.
  • the Buzzer In parallel with the Buzzer is connected the winding of a relay K Triggering the SCR to conduction energizes the Buzzer and relay K
  • the conductor 17 is connected to the anode of an SCR
  • a load circuit for the SCR is connected in the cathode circuit and comprises in parallel a resistor 23 and an indicator light 24.
  • diode 25 and relay winding K This load circuit is connected between negative lead 20 and the cathode of SCR
  • the cathode of SCR is also connected through a pulse circuit comprising a diode 26, a capacitor 27, a junction and a resistor 31 to the gate electrode of SCR Further filtering of the DC voltage by capacitor 32, resistor 33 and Zener diode 34 provides a Well regulated voltage (15 volts for example) on conductors 35 and 20 for a pair of terminals, 36 and 36'.
  • the terminals 36 is connected by a resistor to the negative line 20.
  • a transmission line or remote line 37, 37' which is to be supervised, interconnects these terminals 36, 36'
  • the remote station 40 which terminates the line 37, 37 may include elements such as a normally open condition responsive switch 41, a normally closed condition operated switch 42, a break-before-make transfer switch 43 and does include as an important element of the invention, an endof-line Zener diode 44.
  • This Zener diode has a Zener breakdown voltage which is less than the regulated voltage at terminal 36. In the present example it may be a 10-volt Zener diode.
  • the elements 41, 42 and 43 may be fire responsive, burglar responsive or the like.
  • One further current path may be traced from the regulated potential at conductor 35 through a voltage dropping resistor 50, and a junction 51 to the collector of an NPN transistor 52.
  • the emitter of transistor 52 is directly connected to line 20.
  • a resistor 53 connects the terminal 36' to the base or control electrode of transistor 52.
  • the terminal 36' is further connected through a forward diode 54, a junction 55 and a Zener diode 56 to the gate of SCR
  • Another diode 57 connects the junction 51 to the junction 55.
  • the apparatus is designed so that a quiescent supervisory current normally flows from the central station through the remote line to the remote station end-of-line Zener diode and back, and that a change in this current due to an open in the line or a short across the line operates the alarm for the zone.
  • the regulated 15 volts on line 35 causes a current to flow from terminal 36 at the central station, through remote line 37, through the normally closed condition responsive switches 42 and 43 in series with the line, through the end-ot-line Zener diode 44, back through line 37' to terminal 36'.
  • the current path divides with a portion flowing through resistor 45 to conductor 20 and a second portion flowing through the parallel path comprising resistor 53 and the base-to-emitter control or input circuit of transistor 52.
  • the 10-volt end-of-line Zener diode 44 tends to maintain a 10 volt differential between lines 37 and 37' so that terminal 36' is normally approximately 5 volts positive with respect to conductor 20.
  • a 5-volt potential at terminal 36' is thus normal and is effective to maintain transistor 52 conductive so that no triggering of SCR will occur.
  • a triggering pulse flows through diode 26, capacitor 27, and resistor 31 to trigger SCR
  • the conduction of SCR energizes the audible Buzzer and energizes relay K Since both SCR and SCR are energized from a filtered DC source they remain conductive until the voltage is removed.
  • the Buzzer can be turned oil? by the Silence switch which can be operated to remove the potential from SCR and allow it to extinguish. SCR, can be extinguished by operating the Reset switch which removes the anode potential from it. If the short has been corrected the SCR will remain off when reset.
  • an electrical supervisory device for supervising a line having a supervisory station and a remote station adapted to be interconnected by the line, the combination comprising:
  • a remote station comprising a terminating Zener diode, said remote station being adapted to be connected to said supervisory station by a pair of conductors;
  • a source of potential at said supervisory station having a potential magnitude in excess of said Zener diode breakdown potential, said source being adapted to be connected to said conductors to provide a normal current level through said Zener diode;
  • said current responsive means connected to be responsive to an abnormal current from said source whereby upon the event of an abnormal current flowing toward said remote station said current responsive means is operated, said current responsive means comprising:
  • current switching means comprising a triggering circuit and an output circuit; transistor means connected to receive a bias current which is a function of said current level; impedance means energizing said transistor means output circuit from said source; first diode means including further Zener diode means connecting said transistor means output circuit to said triggering circuit; second diode means including said further Zener diode means connecting said first Zener diode to said triggering circuit, so that upon the occurrence of said abnormal current at least one of said first and second diode means is rendered conductive to apply a signal to said trigger circuit of said current switching means.
  • said current responsive means is connected in a series loop with said source and said Zener diode.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Fire Alarms (AREA)
  • Alarm Systems (AREA)
  • Selective Calling Equipment (AREA)
US604382A 1966-12-23 1966-12-23 Control apparatus Expired - Lifetime US3500394A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US60438266A 1966-12-23 1966-12-23

Publications (1)

Publication Number Publication Date
US3500394A true US3500394A (en) 1970-03-10

Family

ID=24419377

Family Applications (1)

Application Number Title Priority Date Filing Date
US604382A Expired - Lifetime US3500394A (en) 1966-12-23 1966-12-23 Control apparatus

Country Status (4)

Country Link
US (1) US3500394A (cg-RX-API-DMAC7.html)
BE (1) BE708467A (cg-RX-API-DMAC7.html)
DE (1) DE1566708A1 (cg-RX-API-DMAC7.html)
GB (1) GB1182700A (cg-RX-API-DMAC7.html)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3550120A (en) * 1968-12-09 1970-12-22 Honeywell Inc Control apparatus
US3599206A (en) * 1969-11-17 1971-08-10 Gulf & Western Systems Co N Alarm circuit supervisory means
US3623050A (en) * 1967-11-25 1971-11-23 Nittan Co Ltd Electric source devices for fire alarm systems
US3641570A (en) * 1969-04-02 1972-02-08 Francis T Thompson Alarm system
US3641547A (en) * 1970-05-25 1972-02-08 Alarmtronics Eng Inc Line security system
US3653041A (en) * 1969-12-02 1972-03-28 Gulf & Western Syst Co Annunciator system
US3699569A (en) * 1972-01-28 1972-10-17 Minnesota Mining & Mfg Security system for indicating fire, intrusion or the like
US3813662A (en) * 1971-02-04 1974-05-28 N Lewis Electrical alarm systems
US3978476A (en) * 1973-12-17 1976-08-31 Hochiki Corporation Circuit conduction test arrangement for emergency alarm systems
US3997833A (en) * 1974-06-24 1976-12-14 Kokusan Denki Co., Ltd. Voltage regulator for a magneto AC generator
US4191954A (en) * 1978-07-03 1980-03-04 Swiss Aluminium Ltd. Interrupted circuit test with memory and display device
US4199029A (en) * 1978-04-10 1980-04-22 Fike Metal Products Corporation Multiple, independently actuatable fire suppression devices each having individual actuating power source
US4506254A (en) * 1982-11-10 1985-03-19 General Signal Corporation Alarm system with detectors and signaling devices on the same cable pair
US4529970A (en) * 1982-10-18 1985-07-16 Baker Industries Inc. Supervision system for monitoring the integrity of a transmission line
US4716401A (en) * 1985-09-19 1987-12-29 Deere & Company Tamper-resistant supervisory system
US20070085694A1 (en) * 2005-10-19 2007-04-19 Honeywell International, Inc. Monitoring of alarm system wiring
EP2169644A1 (de) * 2008-09-25 2010-03-31 Novar GmbH Prüfung der Meldelinien einer Gefahrenmeldeanlage
CN104658203B (zh) * 2013-11-22 2017-08-25 西门子瑞士有限公司 用于报警系统的线末端模块、控制器及控制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT307931B (de) * 1970-08-08 1973-06-12 Danfoss As Alarmschaltung
RU2319213C1 (ru) * 2006-08-21 2008-03-10 Закрытое Акционерное Общество Электротехнический Завод "Гэксар" Многоблочный источник питания

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3195043A (en) * 1961-05-19 1965-07-13 Westinghouse Electric Corp Hall effect proximity transducer
US3230440A (en) * 1962-04-02 1966-01-18 North American Aviation Inc Power supply with short circuit protection
US3254334A (en) * 1963-12-19 1966-05-31 American District Telegraph Co Electrical protection system utilizing reverse polarity line testing with unidirectional current devices having reverse breakdown characteristic
US3304547A (en) * 1964-12-30 1967-02-14 Iii Benedict Bristol Alarm system
US3311907A (en) * 1964-06-08 1967-03-28 Hugh E Teal Solid state over-voltage and under-voltage detector
US3382409A (en) * 1965-04-20 1968-05-07 Ericsson Telefon Ab L M Overcurrent-and overvoltage-protection arrangement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3195043A (en) * 1961-05-19 1965-07-13 Westinghouse Electric Corp Hall effect proximity transducer
US3230440A (en) * 1962-04-02 1966-01-18 North American Aviation Inc Power supply with short circuit protection
US3254334A (en) * 1963-12-19 1966-05-31 American District Telegraph Co Electrical protection system utilizing reverse polarity line testing with unidirectional current devices having reverse breakdown characteristic
US3311907A (en) * 1964-06-08 1967-03-28 Hugh E Teal Solid state over-voltage and under-voltage detector
US3304547A (en) * 1964-12-30 1967-02-14 Iii Benedict Bristol Alarm system
US3382409A (en) * 1965-04-20 1968-05-07 Ericsson Telefon Ab L M Overcurrent-and overvoltage-protection arrangement

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3623050A (en) * 1967-11-25 1971-11-23 Nittan Co Ltd Electric source devices for fire alarm systems
US3550120A (en) * 1968-12-09 1970-12-22 Honeywell Inc Control apparatus
US3641570A (en) * 1969-04-02 1972-02-08 Francis T Thompson Alarm system
US3599206A (en) * 1969-11-17 1971-08-10 Gulf & Western Systems Co N Alarm circuit supervisory means
US3653041A (en) * 1969-12-02 1972-03-28 Gulf & Western Syst Co Annunciator system
US3641547A (en) * 1970-05-25 1972-02-08 Alarmtronics Eng Inc Line security system
US3813662A (en) * 1971-02-04 1974-05-28 N Lewis Electrical alarm systems
US3699569A (en) * 1972-01-28 1972-10-17 Minnesota Mining & Mfg Security system for indicating fire, intrusion or the like
US3978476A (en) * 1973-12-17 1976-08-31 Hochiki Corporation Circuit conduction test arrangement for emergency alarm systems
US3997833A (en) * 1974-06-24 1976-12-14 Kokusan Denki Co., Ltd. Voltage regulator for a magneto AC generator
US4199029A (en) * 1978-04-10 1980-04-22 Fike Metal Products Corporation Multiple, independently actuatable fire suppression devices each having individual actuating power source
US4191954A (en) * 1978-07-03 1980-03-04 Swiss Aluminium Ltd. Interrupted circuit test with memory and display device
US4529970A (en) * 1982-10-18 1985-07-16 Baker Industries Inc. Supervision system for monitoring the integrity of a transmission line
US4506254A (en) * 1982-11-10 1985-03-19 General Signal Corporation Alarm system with detectors and signaling devices on the same cable pair
US4716401A (en) * 1985-09-19 1987-12-29 Deere & Company Tamper-resistant supervisory system
US20070085694A1 (en) * 2005-10-19 2007-04-19 Honeywell International, Inc. Monitoring of alarm system wiring
EP1777671A1 (en) * 2005-10-19 2007-04-25 Honeywell International, Inc. Monitoring of alarm system wiring
US7372369B2 (en) 2005-10-19 2008-05-13 Honeywell International, Inc. Monitoring of alarm system wiring
EP2169644A1 (de) * 2008-09-25 2010-03-31 Novar GmbH Prüfung der Meldelinien einer Gefahrenmeldeanlage
CN104658203B (zh) * 2013-11-22 2017-08-25 西门子瑞士有限公司 用于报警系统的线末端模块、控制器及控制方法

Also Published As

Publication number Publication date
GB1182700A (en) 1970-03-04
DE1566708A1 (de) 1970-10-22
BE708467A (cg-RX-API-DMAC7.html) 1968-05-02

Similar Documents

Publication Publication Date Title
US3500394A (en) Control apparatus
US3665461A (en) Apparatus for monitoring the conductors or lines of fire alarm installations
US5054023A (en) "Smart" watchdog safety switch
US3656158A (en) Integrated fully supervised fire alarm system
JPH0518159B2 (cg-RX-API-DMAC7.html)
US3909813A (en) Ionization-type fire sensor
CA2298744C (en) Multi-station dangerous condition alarm system incorporating alarm and chirp origination feature
US3448447A (en) Polarized d.c. signaling system and means for supervising same
US3392379A (en) Static logic annunciator
JPH0430699B2 (cg-RX-API-DMAC7.html)
US4510549A (en) Power supply voltage monitor and control system
US3010100A (en) Direct current operated burglar alarm system with alternating current supervision
US4356476A (en) Multiple alarm detector monitoring and command system
US3618081A (en) Condition detection and alarm system
US3676877A (en) Fire alarm system with fire zone locator using zener diode voltage monitoring
US2695994A (en) Supervised signaling system
US3176284A (en) System responsive to plural conditions with false indication prevention
US3653041A (en) Annunciator system
US5446443A (en) Fire-alarm system
US3252156A (en) Alarm annunciator including detection of breaks, grounds, and a break followed by a ground on a monitored line
JPS6017156B2 (ja) 火災警報装置
US3480938A (en) Annunciator system
US4957828A (en) Emergency battery monitor
US3683362A (en) Protective relay using an indicator and alarm circuit
US2832068A (en) Annunciator system