CN204203395U - Cable break on-line checkingi circuit - Google Patents
Cable break on-line checkingi circuit Download PDFInfo
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- CN204203395U CN204203395U CN201420632777.5U CN201420632777U CN204203395U CN 204203395 U CN204203395 U CN 204203395U CN 201420632777 U CN201420632777 U CN 201420632777U CN 204203395 U CN204203395 U CN 204203395U
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Abstract
The utility model provides cable break on-line checkingi circuit; comprise pressure switch; pressure switch arranges normally opened contact NO and normally closed contact NC; normally opened contact NO is connected with control system by circuit 1; normally closed contact NC is connected with control system by circuit 2; it is characterized in that: another detection line 3 is set between normally opened contact NO and control system, between normally opened contact NO with normally closed contact NC, is connected a protective resistance.Control system is by the signal condition situation between detection line 1-2,1-3,2-3; On-off signal signal cable broken string situation can be detected timely; guarantee reliability and the promptness of this signal, can effectively protection system and equipment and prevent the generation of major accident.
Description
Technical field
The utility model relates to cable break detection technique field, specifically, relates to a kind of cable break on-line checkingi circuit.
Background technology
Today of height industrial automation, the security requirement that people run equipment and system is more and more higher, and this just has higher requirement to the reliability of signal and real-time; In order to ensure reliability and the real-time of signal, first we need a kind of effective method by the integrality of control system on-line real time monitoring cable, once cable break we can find timely.
Particularly for the on-off model cable with normally opened contact NO and normally closed contact NC, each On-off signal signal cable of current general employing adopts two-line cable transmission signal, under normal circumstances for on-off model on the spot equipment there being NO/NC two kinds of contacts, the following problem of ubiquity in existing system:
If equipment meets normally opened contact NO on the spot, then, after any core cable breaks, control system cannot monitor;
If equipment meets normally closed contact NC on the spot, then after any cable breaks, control system can produce false alarm, by mistake chain etc.;
Therefore; current lack a kind of effective method always can on-line monitoring cable break; result is once cable break; there is no Timeliness coverage, so relevant parameter when reaching alarming value or need and miscellaneous equipment is chain, protection act time can not accomplish automatic alarm, chain, the object protected.
Utility model content
Can not the realistic problem of broken string accurately, in time in testing circuit in order to solve existing cable, the utility model proposes a kind of cable break on-line checkingi circuit, concrete technical scheme is as follows:
Cable break on-line checkingi circuit; comprise pressure switch; pressure switch arranges normally opened contact NO and normally closed contact NC; normally opened contact NO is connected with control system by circuit 1; normally closed contact NC is connected with control system by circuit 2; another detection line 3 is set between normally opened contact NO and control system, between normally opened contact NO with normally closed contact NC, is connected a protective resistance.
Preferably, described protective resistance resistance is 10 kilo-ohms ~ 50 kilo-ohms.
Cable break on-line checkingi circuit provided by the utility model, has the following advantages:
On-off signal signal cable broken string situation can be detected timely, guarantee reliability and the promptness of this signal, in some cases can effectively protection system and equipment and prevent the generation of major accident.
Accompanying drawing explanation
Fig. 1 is prior art breaker in middle amount signal transmission cable circuit diagram;
Fig. 2 is the utility model cable break on-line checkingi circuit diagram.
[critical piece symbol description]
1: circuit 1; 2: circuit 2; 3: circuit 3; 4: normally opened contact NO; 5: normally closed contact NC; 6: pressure switch; 7: resistance.
Embodiment
Below in conjunction with accompanying drawing and embodiment of the present utility model to the further detailed description of cable break on-line checkingi circuit of the present utility model.
Fig. 1 is prior art breaker in middle amount signal transmission cable circuit diagram, Fig. 2 is the utility model cable break on-line checkingi circuit diagram, as can be seen from the contrast of Fig. 1 and Fig. 2, the utility model on the basis of original two-wire system signal cable, increase by a cable and a resistance realizes adopting the method for three-wire system external resistor to judge cable break function.
Cable break on-line checkingi circuit of the present utility model; comprise pressure switch 6; pressure switch 6 arranges normally opened contact NO4 and normally closed contact NC5; normally opened contact NO4 is connected with control system by circuit 1; normally closed contact NC5 is connected with control system by circuit 2; it is characterized in that: another detection line 3 is set between normally opened contact NO and control system; a protective resistance 7 is connected between normally opened contact NO with normally closed contact NC; wherein resistance 7 resistance size calculates according to control system producer and determines, the resistance of usual protective resistance is between 10 kilo-ohms to 50 kilo-ohms.
The process of cable break on-line checkingi broken string of the present utility model is as follows:
A: setting in control system between 1-2 contact is state a is just so state b between 1-3; Because the weak current signal that has having resistance is state c between 2-3, be state d without weak current signal;
B: if normally reach setting value without broken string situation switch, contact NO connects equipment on the spot, then the state generation upset in control system between 1-2 becomes b, and between 1-3, state turnover becomes a, control system can detect state change in time;
C: if circuit 1 breaks, then the state generation upset in control system between 1-3 becomes a, and control system just produces the alerting signal that circuit 1 breaks;
D: if circuit 2 breaks, then the current signal in control system between 2-3 disappears, and overturns as state d, and control system can detect in time and send the alerting signal of circuit 2 broken string;
E: if circuit 3 breaks or any two lines break simultaneously, state generation upset then in control system between 1-3 becomes a, current signal simultaneously between 2-3 disappears, become state d, control system can detect in time and send the alerting signal that circuit 3 breaks or any two lines break simultaneously.
This circuit is suitable for and all On-off signal signal circuits; the control system be connected with this circuit can be DCS or PLC control system; circuit 1,2,3 is connected with the connection terminal in DCS or PLC cabinet respectively; by Signal transmissions to control system; this illustration method considers according to meeting normally opened contact NO during equipment normal condition on the spot; if meet normally closed contact NC during normal condition, determination methods is similar to the above, belongs to protection domain of the present utility model equally.
Claims (2)
1. cable break on-line checkingi circuit; comprise pressure switch; pressure switch arranges normally opened contact NO and normally closed contact NC; normally opened contact NO is connected with control system by circuit 1; normally closed contact NC is connected with control system by circuit 2; it is characterized in that: another detection line 3 is set between normally opened contact NO and control system, between normally opened contact NO with normally closed contact NC, is connected a protective resistance.
2. on-line checkingi circuit according to claim 1, is characterized in that: described protective resistance resistance is 10 kilo-ohms ~ 50 kilo-ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420632777.5U CN204203395U (en) | 2014-10-29 | 2014-10-29 | Cable break on-line checkingi circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420632777.5U CN204203395U (en) | 2014-10-29 | 2014-10-29 | Cable break on-line checkingi circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204203395U true CN204203395U (en) | 2015-03-11 |
Family
ID=52661340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420632777.5U Active CN204203395U (en) | 2014-10-29 | 2014-10-29 | Cable break on-line checkingi circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204203395U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316818A (en) * | 2014-10-29 | 2015-01-28 | 青岛鸿瑞电力工程咨询有限公司 | Circuit and method for detecting disconnection of cable online |
-
2014
- 2014-10-29 CN CN201420632777.5U patent/CN204203395U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316818A (en) * | 2014-10-29 | 2015-01-28 | 青岛鸿瑞电力工程咨询有限公司 | Circuit and method for detecting disconnection of cable online |
| CN104316818B (en) * | 2014-10-29 | 2017-06-16 | 青岛鸿瑞电力工程咨询有限公司 | Cable break online test method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |