SU888158A1 - Device for testing indicating circuits - Google Patents

Description

The invention relates to automation and telemechanics and can be used in the field of signaling.

Devices for testing signal circuits are known, which contain working and, control, power sources connected via contact elements to indicator lamps combined in groups 1.

The disadvantages of the known devices include the limited functionality due to the use for P1) of checking the signal circuits of the power sources of either AC or only DC.

Closest to the proposed device for signaling, containing sources of working and control power, signal indicators connected to the same bus connected to. one pole of the operating power source, through the contact elements - with the second bus and through r in conjunction; the elements - with the third bus of the device, and the operating mode switch, the second and third tires are connected respectively to the moving contact switch, the fixed contacts of the same position

 the switch is connected and connected to the second pole of the operating power source, the fixed contacts of the other position of the switch are connected to the poles of the source of control power, and the isolating elements are in the form of redundant signal indicators 2.

The parallel connection of the indicators in this device is converted into a serial connection of two groups of indicator lights and due to this it is possible to periodically monitor

15 serviceability of duplicated indicator lights at any position of contact elements.

The disadvantages of the prototype should include the impossibility of continuous

20 controls for the health of indicator lights, i.e. relatively low reliability.

The aim of the invention is to increase the reliability of the device.

25

The goal is achieved by the fact that the device for testing signal circuits, containing the sources of the working and control; power, signal indicators and contact

Claims (2)

30 elements, introduced the first and second diodes of the working circuit, the diodes of the control circuit, zener diodes and an alarm indicator. Each signal indicator through the first diode of the working circuit and the contact element is connected to the first bus of the operating power source, and through the second diode of the working circuit and the citron to the second bus; The first tire of the source of control power is connected through a circuit of alternately connected diodes of the control circuit and the signal indicators are connected to the first bus of the alarm indicator, the second with the bus connected to the second bus of the source of control power. The principal scheme of the device is shown in the drawing. The device for checking signal circuits contains a source of control power 1, a source of operating power 2, an alarm indicator 3, control circuit diodes 4, ... 4 ,, signal indicators 5. ... 5, first operating diodes 6 ... bu, , stable ron 7j ... .7p., Contact elements of memory,. . . 8th second working circuit diodes 9. . . 9". The device works as follows. The parameters of the source of operating voltage 2 and zener diodes 7f 7 are such that when the contact elements 8 ... 8 are closed, the signal. Indicators 5,,. 5. Light with sufficient brightness for visual observation. The control voltage is chosen such that the zener diodes 7. . . 1u) could provide the necessary. the brightness of the signal indicators 5 ,,, 5, as well as reliable separation of two power sources. The device can work with sources of both direct and alternating current. One of the important tasks is to monitor an unencrypted signal indicator. Consider the state of the circuit when the contact elements 8 and 8 are turned on, and 8 ... 8 are turned off. We assume that the power sources 1 and 2 are alternating current, and for a more reliable operation of the device as a whole between the control and operating voltages, the phase shift is 180 degrees. This means that in one of the half periods; the current flows in the circuit of the source of the control voltage, and in the other half-period in the circuit of the source of the working voltage. In the event of a malfunction of one of the signal indicators 5 ... 5 or contact failure in the holders of these current indicators in the circuit of the source of control voltage will not, and the alarm indicator 3 will give a command to activate the emergency light or sound alarm. The inclusion of contact elements 8 ... 8 y, the working circuit does not affect the operation of the control circuit. An apparatus for testing signal circuits containing operating and monitoring power sources, signal indicators and contact elements, characterized in that, in order to increase the reliability of the device, the first and second operating diodes, control diodes, zener diodes and the alarm indicator, each signal indicator through the first diode of the working circuit and the contact element is connected to the first bus of the working source, power supply, and through the diode of the working circuit and the zener diode; to the second bus, the first bus for controlling the source of supply through the circuit control circuit serially connected diodes and signal indicators coupled to the first indicator shinoy- accident, the second bus to which .pod oTyuchena. the second bus of the control power supply. Sources of information taken into account in the examination 1. US. Pat. No. 3952229, cl. G 08 B 21/00, published 1976. 2. USSR author's certificate number 423152, cl. G 08 B 21/00, 1971 (prototype). 4r- / fn-f 4 / r ffr 4 L --t bHghH i SM