CN207149483U - A kind of PLC protection circuits for improving unattended control cabinet - Google Patents
A kind of PLC protection circuits for improving unattended control cabinet Download PDFInfo
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- CN207149483U CN207149483U CN201720681004.XU CN201720681004U CN207149483U CN 207149483 U CN207149483 U CN 207149483U CN 201720681004 U CN201720681004 U CN 201720681004U CN 207149483 U CN207149483 U CN 207149483U
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- plc
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- auxiliary reclay
- power supply
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Abstract
A kind of PLC protection circuits for improving unattended control cabinet, including PLC, the L poles with power supply, N poles are connected respectively for L poles, the N poles of PLC, it is characterised in that：An auxiliary reclay is set up between the output end of the PLC and load, the output end of PLC is connected with coil one end of auxiliary reclay, then the N poles of the coil other end connection power supply of auxiliary reclay, normal open switch and load in auxiliary reclay are serially connected between the L poles of power supply, N poles, and the normal open switch in auxiliary reclay is controlled by the coil of auxiliary reclay.The utility model is simple and reasonable; the mode of connection is safe and reliable; transferred by setting up auxiliary reclay between the output end of PLC and load; so as to realize the protection to PLC output ends; effectively improve the route protection performance of unattended control cabinet; the normal work of PLC is ensure that, extends service life.
Description
Technical field
It the utility model is related to a kind of PLC protection circuits for improving unattended control cabinet.
Background technology
As with the very fast development of economic level and science and technology, unattended control cabinet is applied to many fields,
Especially in field of traffic, because traffic accident takes place frequently, unattended traffic lights control system is mounted at the crossing in city etc.
The purpose that system is monitored in real time with reaching.But PLC output ends occur during indivedual unattended control cabinet uses at this stage
It is breakdown, cause control cabinet can not normal use the problem of, this phenomenon producing cause is generally PLC load excessives.At nobody
Then high induction equipment, frequent starting stopping or surge, the phenomenon of excessively stream are easy to burn PLC output point in control cabinet on duty
Ruin PLC output dot circuits, it is therefore desirable to Additional Protection.
Through looking into, existing Patent No. CN201120196927.9 Chinese patent《A kind of servo control box》, its feature exists
In：Its structure mainly includes, and switching power circuit, control loop, over under-voltage protection circuit, miniature relay and electron servo become
Depressor；The over under-voltage protection circuit connecting valve power circuit, switching power circuit connection miniature relay, miniature relay
Connect control loop, control loop connection electronic servo transformer.It is provided with over under-voltage protection circuit and protecting against shock in circuit
Circuit, play a protective role, but it is the control cabinet for servomotor, is not to be directed to unattended control cabinet, therefore
Need to design a kind of PLC protection circuits for improving unattended control cabinet to meet the use needs of unattended control cabinet.
The content of the invention
Technical problem to be solved in the utility model is to provide a kind of structure design for the above-mentioned state of the art and close
Reason, the safe and reliable PLC protection circuits for easily improving unattended control cabinet.
Technical scheme is used by the utility model solves above-mentioned technical problem：A kind of unattended control cabinet of improvement
PLC protection circuits, including PLC, the L poles with power supply, N poles are connected respectively for L poles, the N poles of PLC, its feature
It is：An auxiliary reclay, output end and the centre of PLC are set up between the output end of the PLC and load
Coil one end of relay is connected, then the N poles of the coil other end connection power supply of auxiliary reclay, in auxiliary reclay
Normal open switch and load are serially connected between the L poles of power supply, N poles, line of the normal open switch in auxiliary reclay by auxiliary reclay
Circle control.
Further, the auxiliary reclay uses AC intermediate relay, two ports of the output end of PLC
It is connected respectively with the 13rd tip node of the coil of auxiliary reclay, the 14th tip node of the coil of auxiliary reclay and power supply
N poles are connected.
Further, the 5th tip node of the normal open switch on the auxiliary reclay is connected with the L poles of power supply, normally opened to open
The 9th tip node closed is connected with load, and the other end of load is connected with the N poles of power supply.
Finally, the power supply is AC220V.
Compared with prior art, the utility model has the advantage of：Set up between the output end of PLC and load
Auxiliary reclay is transferred, so as to realize the protection to PLC output ends.The utility model is simple and reasonable, mode of connection safety
Reliably, the route protection performance of unattended control cabinet is improved, it is ensured that the normal work of PLC, extend use
Life-span.
Brief description of the drawings
Fig. 1 is the structured flowchart of the PLC protection circuits of the utility model embodiment.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in figure 1, a kind of PLC protection circuits for improving unattended control cabinet, including PLC 1, PLC controls
The L poles with power supply, N poles are connected respectively for L poles, the N poles of device 1, power supply AC220V, output end 11 and the centre of PLC 1
Coil one end of relay 2 is connected, then the N poles of the coil other end connection power supply of auxiliary reclay 2, auxiliary reclay 2
In normal open switch 3 and load 4 be serially connected between the L poles of power supply, N poles, the normal open switch 3 in auxiliary reclay 2 by centre after
The coil control of electrical equipment 2, so transfers between the output end 11 of PLC 1 and load 4 by auxiliary reclay 2, so as to
Realize the protection to the output end 11 of PLC 1.
The auxiliary reclay 2 of the present embodiment uses Omron relay, is exactly AC intermediate relay one kind, and load 4 is
Traffic light signal lamp, the circuit before improvement are：Two ports of the output end 11 of PLC 1 it is directly external be traffic lights
Signal lamp；
Now be improved to the output end 11 of PLC 1 two ports switching auxiliary reclay 2 after reconnect it is red green
Signal lamp, specific connection are such：Two ports of the output end of PLC 1 line with auxiliary reclay 2 respectively
13rd tip node 13 of circle is connected, and the 14th tip node 14 of the coil of auxiliary reclay 2 is connected with the N poles of power supply, middle
5th tip node 5 of the normal open switch 3 on relay 2 is connected with the L poles of power supply, the 9th tip node 9 of normal open switch 3 with it is red green
Modulating signal lamp is connected, and the other end of traffic light signal lamp is connected with the N poles of power supply.
The principle design of auxiliary reclay 2 is such：The coil of auxiliary reclay 2 is on the magnetic conductor of u shapes, magnetic conduction
There is an armature above body, magnetic conductor both sides are equipped with two bank contact monolithics, armature are held up upwards under non-dynamic state, make armature
Certain gap is kept between magnetic conductor, when the electromagnetic torque between air gap exceedes the moment of reaction, armature is attracted to magnetic conduction
Body, while armature presses contact shell fragment, normally-closed contact is disconnected normally opened contact closure, so as to complete the transmission of signal, and in fact
Now to PLC circuit protection.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model technical principle is not departed from, some improvements and modifications can also be made, these change
Enter and retouch and also should be regarded as the scope of protection of the utility model.
Claims (4)
1. a kind of PLC protection circuits for improving unattended control cabinet, including PLC, L poles, the N poles point of PLC
L poles, N poles not with power supply are connected, it is characterised in that：Set up between the output end of the PLC and load among one
Relay, the output end of PLC are connected with coil one end of auxiliary reclay, and then the coil of auxiliary reclay is another
The N poles of end connection power supply, normal open switch and load in auxiliary reclay are serially connected between the L poles of power supply, N poles, middle relay
Normal open switch in device is controlled by the coil of auxiliary reclay.
2. PLC protection circuits according to claim 1, it is characterised in that：The auxiliary reclay using among exchange after
Electrical equipment, two ports of the output end of PLC are connected with the 13rd tip node of the coil of auxiliary reclay respectively, middle
14th tip node of the coil of relay is connected with the N poles of power supply.
3. PLC protection circuits according to claim 2, it is characterised in that：Normal open switch on the auxiliary reclay
5th tip node is connected with the L poles of power supply, and the 9th tip node of normal open switch is connected with load, the other end and power supply of load
N poles be connected.
4. according to the PLC protection circuits described in claim 1 or 2 or 3, it is characterised in that：The power supply is AC220V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720681004.XU CN207149483U (en) | 2017-06-13 | 2017-06-13 | A kind of PLC protection circuits for improving unattended control cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720681004.XU CN207149483U (en) | 2017-06-13 | 2017-06-13 | A kind of PLC protection circuits for improving unattended control cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207149483U true CN207149483U (en) | 2018-03-27 |
Family
ID=61671272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720681004.XU Active CN207149483U (en) | 2017-06-13 | 2017-06-13 | A kind of PLC protection circuits for improving unattended control cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207149483U (en) |
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2017
- 2017-06-13 CN CN201720681004.XU patent/CN207149483U/en active Active
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