CN208444786U - It is a kind of to eliminate the circuit that dry contact signal circuit induced voltage influences by relay - Google Patents
It is a kind of to eliminate the circuit that dry contact signal circuit induced voltage influences by relay Download PDFInfo
- Publication number
- CN208444786U CN208444786U CN201720373994.0U CN201720373994U CN208444786U CN 208444786 U CN208444786 U CN 208444786U CN 201720373994 U CN201720373994 U CN 201720373994U CN 208444786 U CN208444786 U CN 208444786U
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- relay
- circuit
- dry contact
- induced voltage
- signal
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Abstract
The circuit that dry contact signal circuit induced voltage influences is eliminated by relay the utility model discloses a kind of, including live dry contact switch S1, relay KA1 and relay KA2, one end of the scene dry contact switch S1 connects firewire L, the other end is separately connected the non-moving end 1 of the contact of relay KA2 and relay KA2, the utility model is by way of increasing relay on control signal path, eliminate influence of the induced voltage to control room signal relay, its malfunction is avoided, the stability of circuit is increased.
Description
Technical field
It is specifically a kind of that the sense of dry contact signal circuit is eliminated by relay the utility model relates to a kind of relay circuit
Answer the circuit of voltage influence.
Background technique
Electric control loop is after putting into operation, the often interference by electromagnetic signal around, and shielded cable is not used
Or the interference of signal circuit and the public cable of electric power loop is more serious, some even causes electrical equipment normal
Operating.Even if this influence can not be completely eliminated in control room setting signal disconnecting relay.
For alternating current 220V dry contact circuit, the induced voltage in normal uncharged dry contact circuit can be high during operation
It up to 120V~170V, is malfunctioned so as to cause the signal isolation relay (KA1) of control room, and issues error signal to PLC.It removes
Other than replacement cable, there are also following common interfering signal removing methods: circuit string resistance partial pressure, spare core grounding, circuit
The methods of shunt capacitance, furthermore it is also conceivable to replacement relay.Cable is replaced, cost is high, and other methods also have one
Fixed deficiency, cannot be inherently eliminated the influence of induced voltage.This method is thoroughly to eliminate circuit by increasing a relay
Influence of the induced voltage to control room disconnecting relay.
Utility model content
The influence of dry contact signal circuit induced voltage is eliminated by relay the purpose of this utility model is to provide a kind of
Circuit to solve the problems mentioned in the above background technology.
To achieve the above object, the utility model provides the following technical solutions:
It is a kind of to eliminate the circuit that dry contact signal circuit induced voltage influences, including live dry contact switch by relay
S1, relay KA1 and relay KA2, one end connection firewire L of the scene dry contact switch S1, the other end be separately connected after
The non-moving end 2 of the non-moving end 1 of the contact of electric appliance KA2 and relay KA2, the contact of relay KA2 is grounded, the touching of relay KA2
The moved end of point connects relay KA1, and the other end of relay KA1 connects zero curve N, and the other end of relay KA2 connects zero curve N.
As a further solution of the present invention: the relay KA1 is signal isolation relay.
Compared with prior art, the utility model has the beneficial effects that the utility model passes through on control signal path
The mode for increasing relay, eliminates influence of the induced voltage to control room signal relay, avoids its malfunction, increase electricity
The stability on road.
Detailed description of the invention
Fig. 1 is the principles of the present invention figure.
Fig. 2 is the schematic diagram of the prior art.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
It is a kind of that dry contact signal circuit induced electricity is eliminated by relay referring to FIG. 1-2, in the utility model embodiment
The circuit influenced, including live dry contact switch S1, relay KA1 and relay KA2 are pressed, the scene dry contact switch S1's
One end connects firewire L, and the other end is separately connected the non-moving end 1 of the contact of relay KA2 and relay KA2, the touching of relay KA2
The non-moving end 2 of point is grounded, and the moved end of the contact of relay KA2 connects relay KA1, and the other end of relay KA1 connects zero curve
The other end of N, relay KA2 connect zero curve N.
Relay KA1 is signal isolation relay.
The working principle of the utility model is: Fig. 2 is the circuit diagram of the prior art, the technical solution adopted is that increasing at the scene
Add a relay KA1, pass through this relay and realize following functions: when dry contact is not operating, relay is by target loop
(line) ground connection；When dry contact movement, target loop (line) is connected alternating current 220V power supply by relay,
After process conditions meet, live dry contact point closure, No. 2 lines of alternating current 220V Voltage On state, and pass to control
The signal isolation relay (KA1) of room, the movement of disconnecting relay contact, PLC obtain corresponding input signal.
The influence of 1.3 interference signals
In the case where there is strong interference when production equipment operates normally, even if dry contact switch is not closed, 2
The induced voltage of number line also can reach that 120V or more is even higher, this voltage is enough to make signal isolation relay misoperation, and
PLC is caused to malfunction.
1.4 analyses of causes: original design cable does not use shielded cable or the public control cable of multiloop, mutually
Serious interference.
Fig. 1 is the circuit diagram of the design, at the scene before dry contact closure, towards the conducting wire (2 of control room signal relay
Number line) ground connection, and after live dry contact closure, No. 3 lines obtain electric, while KA2 is acted, and No. 2 lines, No. 3 lines are connected, and control room is led to
The conducting wire of signal relay connects 220V alternating current, KA1 movement.Induced voltage has thus been inherently eliminated to believe control room
The influence of number relay, avoids its malfunction.
Claims (2)
1. a kind of eliminate the circuit that dry contact signal circuit induced voltage influences by relay, which is characterized in that including scene
Dry contact switch S1, relay KA1 and relay KA2, one end of the scene dry contact switch S1 connect firewire L, the other end
It is separately connected the non-moving end 1 of the contact of relay KA2 and relay KA2, the non-moving end 2 of the contact of relay KA2 is grounded, relay
The moved end of the contact of device KA2 connects relay KA1, and the other end of relay KA1 connects zero curve N, and the other end of relay KA2 connects
Meet zero curve N；At the scene before dry contact closure, towards the wired earth of control room signal relay, and live dry contact is closed
Afterwards, 220V alternating current is connected towards the conducting wire of control room signal relay, to eliminate induced voltage to control room signal relay
Influence.
2. a kind of circuit that the influence of dry contact signal circuit induced voltage is eliminated by relay according to claim 1,
It is characterized in that, the relay KA1 is signal isolation relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720373994.0U CN208444786U (en) | 2017-04-11 | 2017-04-11 | It is a kind of to eliminate the circuit that dry contact signal circuit induced voltage influences by relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720373994.0U CN208444786U (en) | 2017-04-11 | 2017-04-11 | It is a kind of to eliminate the circuit that dry contact signal circuit induced voltage influences by relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208444786U true CN208444786U (en) | 2019-01-29 |
Family
ID=65094714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720373994.0U Expired - Fee Related CN208444786U (en) | 2017-04-11 | 2017-04-11 | It is a kind of to eliminate the circuit that dry contact signal circuit induced voltage influences by relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208444786U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051763A (en) * | 2020-08-06 | 2020-12-08 | 陕西榆林能源集团横山煤电有限公司 | Circuit for eliminating induced electricity of alternating current control loop and implementation method thereof |
-
2017
- 2017-04-11 CN CN201720373994.0U patent/CN208444786U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051763A (en) * | 2020-08-06 | 2020-12-08 | 陕西榆林能源集团横山煤电有限公司 | Circuit for eliminating induced electricity of alternating current control loop and implementation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190129 Termination date: 20200411 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |