JPH03256092A - Testing device for lighting of pilot lamp - Google Patents

Abstract

PURPOSE:To easily test the lighting of the pilot lamp by providing a deficient current relay which holds a stepping relay, exciting with a switch for testing the lighting of the pilot lamp, excited by an auxiliary relay and detects a deficiency in the in-lighting current of the pilot lamp. CONSTITUTION:The stepping relay 16 is excited by the operation of the switch 14 for testing the lighting and its stepping relay contact 16a is switched at certain intervals of time. Further, the auxiliary relay 17 which is excited when the switch 14 for the lighting test is turned on is connected to the stepping relay 16 and a condition holding circuit 20 is formed of its auxiliary contact 17a, a step completion contact 18 which operates when the step of the stepping relay 16 is completed, and the deficient current contact 19b of a deficient current relay 19. Therefore, when pilot lamps 13 are turned on a time-division basis in order, the deficient current relay 19 operates while a current value is less than a normal current value; and the stop of the stepping relay 16 is stopped and a part where a pilot lamp blows out is indicated to an operator. Consequently, the lighting test can easily be conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a lighting test device for indicator lights that indicate the status or abnormality of equipment installed on a monitoring panel of a plant.

(Prior art) Plant monitoring panels are equipped with operation indicator lights that display the status of processes and equipment, and failure indicator lights that indicate abnormalities in processes and equipment, and these indicator lights generally include lamps. It has been adopted.

If a lamp bulb burns out, these indicator lights will not display the operating status or failure status, so it is necessary to check whether the lamp bulb is burnt out or not.

For this purpose, a lighting test device is provided to check for burnout of the indicator lamp, an example of which is shown in FIG. Current is supplied from the power source 12 to the indicator light 13, and the indicator light 13 lights up. The lighting test device is connected to the indicator light 13 of such an indicator light circuit, and is connected to the lighting test switch 14.
and a diode 15 for preventing wraparound.

That is, when checking whether the indicator lamp 13 is out of bulb, turn on the lighting test switch 14 to check if the indicator lamp 13 is out.
Connect the power supply 11 to 3. In this case, if the indicator light 13 is normal, it lights up. Therefore, if any indicator lamp 13 remains off, it is assumed that the lamp bulb is out, and the lamp bulb of the indicator lamp 13 is replaced.

Here, since the lighting test device is connected in parallel with the indicator lamp circuit, the diode 15 for preventing turning around prevents turning on other indicator lights 13 when a certain status contact 11 is operated. It is something.

Generally, about 10 to 100 such operation indicator lights and failure indicator lights are assembled and installed on a monitoring panel, and one lighting test switch 14 is used to check these indicator lights 13. All indicator lights are tested by lighting.

(Problem to be Solved by the Invention) However, in such a conventional device, when the lighting test of the indicator lamp 13 is completed, the entire current of the indicator lamp 13 is borne by the contact and the breaker capacity of the lighting test switch 14. The contact breaking capacity must be amplified using a relay or contactor that has contacts that can cut off all of that current.

In addition, it is necessary to prepare wires and power supplies used in the inspection circuit of the inspection test equipment with thick wires and large power supply capacity to match the load current when the indicator lights 13 are fully lit. Ta.

Furthermore, it was necessary to keep pressing the lighting test switch 14 until the visual confirmation of the lighting state of the indicator lamp 13 was completed.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an indicator light inspection and testing device that is inexpensive, compact, and capable of easily testing indicator lights.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a plurality of indicator lights for inputting and displaying the status and abnormality of process equipment via status contacts, each of which is connected in parallel with a status contact. In a lighting test device for indicator lights that supplies power to each indicator light via a diode and tests the lighting, a stepping relay is operated by operation of a lighting test switch and sequentially switches its contacts at certain time intervals; An inspection circuit connects each diode to the stepping relay contact in groups to supply power to the indicator light via the undercurrent relay, and maintains the operating state of the stepping relay until the stepping relay contact reaches the step completion position. It also includes a condition holding circuit for canceling the operation of the step relay when the undercurrent relay is activated.

(Function) As a result, the indicator lamps are sequentially turned on separately via the diodes grouped by the stepping relay.
When the current value at that time is less than the normal current value, the undercurrent relay operates, and its operating contacts stop the stepping relay from stepping, indicating to the operator the part of the indicator light where the bulb is burnt out.

Therefore, the stepping relay only needs to have a small contact breaking capacity, and the wire size and power capacity can also be made smaller, and if the lighting status of the indicator lamps is visually checked, if the lighting stops in sequence, the bulbs may be blown out. Occurrence can be determined.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIG.

FIG. 1 shows a lighting test device for an indicator light 13 according to an embodiment of the present invention. In the figure, the same parts and corresponding parts as in FIG. 2 are given the same reference numerals.

In the figure, the stepping relay 16 is excited by operating the lighting test switch 14, so that the stepping relay contact 16a is sequentially switched at a certain time interval, and the stepping relay contact 16a is energized by operating the lighting test switch 14. The indicator lights 13 are divided into groups and connected through the prevention diodes 15. In the figure, the wraparound prevention diodes 15 are grouped by two.

The stepping relay 16 includes a lighting test switch 14.
An auxiliary relay 17 that is energized when turned on is connected, and its auxiliary contact 17a and stepping relay 16
Step completion contact 1 that operates when the step is completed
8 and an undercurrent contact 19b of an undercurrent relay 19 connected to the stepping relay contact 16a.

Now, when the lighting test switch 14 is turned on, the auxiliary relay 17 operates and its auxiliary contact 17a closes.

As a result, stepping relay 16 maintains its operating state. Therefore, by operating the 1-lighting test switch 14 for a short time until the auxiliary contact 17a of the auxiliary relay 17 operates, the 1-condition holding circuit 20 forms a lighting circuit for the indicator lamp 13. As a result, the stepping relay 16 maintains its operating state, so the stepping relay contact 16
a is sequentially switched at a certain time interval, and the indicator light 13 divided into groups is connected to the stepping relay contact 16a, so the indicator light 13 is lit until the contact switching time. . When the indicator light 13 is normal, the step completion contact 18 is activated when the stepping relay contact 16a is switched to the step completion position, the condition holding circuit 20 is released, and the series of indicator light lighting tests is completed.

On the other hand, if the indicator light 13 is out of bulb, the load current value will be lower than the normal load current value of the indicator light 13, so the undercurrent relay 19 will detect the undercurrent, and the undercurrent contact 19 will detect the undercurrent.
b will be closed. As a result, the condition holding circuit 20 is released, the stepping relay 16 is de-energized, and the indicator lamp lighting test is stopped when the corresponding group of indicator lamps 13 have burnt out bulbs, and the operator is informed that the indicator lamps are burnt out. This can encourage the occurrence of Then, after confirming that the bulb is out or replacing the bulb, the lighting test switch 14 is operated again, and the test is continued until the series of indicator light lighting tests are completed.

Furthermore, by dividing the indicator lights 13 into groups, the power supply capacity can be reduced, and the lighting test device can also be made with small wires, so it can be provided at low cost.

[Effects of the Invention] As explained above, according to the present invention, a stepping relay is provided which is energized by the operation of a lighting test switch for one indicator light, and the energization of the stepping relay is maintained by an auxiliary relay, so that the indicator light is Since an undercurrent relay is provided to detect a shortage of lighting special current, when the lighting test switch is operated, the location where the bulb of the 1 indicator lamp is burnt out is indicated by the operation of the undercurrent relay. Furthermore, since the indicator lamps are divided into groups, it is possible to obtain the effect that the power supply capacity and electric wire size can be reduced.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an indicator lamp lighting test device showing one embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional example of an indicator lamp lighting test device. l... Status contact, 12... Power supply, 13... Indicator light, 14... Lighting test switch, 15... Diode, 16... Stepping relay, 17... Auxiliary relay, 18 ...Step completion contact, 19...Undercurrent relay, 20...Condition holding circuit.

Claims (1)

[Claims] Power is supplied to each of the indicator lights through each diode connected in parallel with the status contact to turn on the plurality of indicator lights that input and display the status and abnormalities of the process equipment through the status contacts. In the indicator light lighting test equipment to be tested, there is a stepping relay that is activated by the operation of a lighting test switch and switches its contacts sequentially at a certain time interval, and each of the diodes is grouped and connected to the stepping relay contact. an inspection circuit for supplying power to the indicator light via a current relay; and a check circuit for maintaining the operating state of the stepping relay until the stepping relay contact reaches the step completion position, and when the undercurrent relay is operated; A lighting test device for an indicator light, comprising a condition holding circuit for canceling the operation of a step relay.