CN104410048A - Motor overload and default phase protection circuit on cast tube production line - Google Patents
Motor overload and default phase protection circuit on cast tube production line Download PDFInfo
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- CN104410048A CN104410048A CN201410801908.2A CN201410801908A CN104410048A CN 104410048 A CN104410048 A CN 104410048A CN 201410801908 A CN201410801908 A CN 201410801908A CN 104410048 A CN104410048 A CN 104410048A
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Abstract
The invention discloses a motor overload and default phase protection circuit on a cast tube production line. The motor overload and default phase protection circuit comprises a PLC control system; a motor is a three-phase motor; a main circuit of the motor is controlled by a main contact of an alternating current contactor; a coil of the alternating current contactor is controlled by a contact of a relay; a coil of the relay is controlled by the PLC control system; and two alternating current transmitters are arranged on two-phase circuits of the main circuit of the motor and are connected with the PLC control system. With the adoption of the technical scheme, the motor overload and default phase protection functions are realized; the problem of protection failure brought by manual increase of a protection setting value is avoided, the safety operation of the motor is effectively protected, equipment failure is reduced, and the maintenance cost is greatly reduced; and moreover, after failure occurs, automatic reset is realized within the set time, the workload of manual reset is reduced, the operating state is restored, and the workload of manual reset needed by original protection is reduced.
Description
Technical field
The invention belongs to the technical field of plant equipment automatic control system, relate to the Protection control system of cast tube production line.More specifically, the present invention relates to a kind of cast tube production line motor overload and open-phase protection circuit.
Background technology
On nodular cast iron pipe production line, have and multiplely cut ring, chamfering, interior grinder position.Due to job specification, these stations require higher to the adjustment of plant equipment.When plant equipment adjustment is improper, or because of the reasons such as remodeling, vibrations need again to adjust time, the load variations of motor very greatly, causes motor overload.Due to machinery adjustment trouble, often post operation personnel will tune up the setting value of electric motor protecting, make electric motor protecting control lost efficacy and burnt out motor.
In the prior art, the protection of motor uses common thermal relay.The thermal element that common thermal relay uses is bimetallic sheet structure, and electric current makes it thermal deformation, and drived control mechanism action realizes.Like this, the control loop of long term frequent action is again that in the environment of overload, the sluggish of bimetal leaf, almost loses protective effect to motor.Also the motor protecter (as EOCR-SS-30N 440) using import is had; but because overload trip is frequent; operating personnel are reluctant again to adjust mechanical mechanism; but protector setting value is tuned up or overload time extend solve, so also greatly reduce the available protecting effect of protector to motor.Electric defencive function loses effect at above several station, and motor damage amount increases, and production cost remains high.
Summary of the invention
The invention provides a kind of cast tube production line motor overload and open-phase protection circuit, its objective is the protection realizing motor overload and phase shortage.
To achieve these goals, the technical scheme that the present invention takes is:
Cast tube production line motor overload of the present invention and open-phase protection circuit; be provided with PLC control system; described motor is three phase electric machine; the main circuit of described motor is controlled by the main contact of A.C. contactor; the coil of described A.C. contactor is controlled by the contact of relay; the coil of described relay is controlled by described PLC control system; on the quarter-phase circuit of the main circuit of described motor; respectively arrange an AC current transducer, described AC current transducer is connected with described PLC control system.
Described protective circuit is provided with human-computer interaction device.
Described protective circuit is provided with AC/DC transducer, and described relay is arranged in the DC circuit of AC/DC transducer.
In order to realize the goal of the invention identical with technique scheme, present invention also offers the guard method that above-described cast tube production line motor overload and open-phase protection circuit adopt, to be described guard method be its technical scheme:
A, by starting, the operation of stop button, operating element controls startup and the stopping of grinding head motor; When there is overload or phase shortage in running, protection act element, by deferred action, disconnects and runs circuit;
When B, bistrique start, after time delay, enter guard mode, escape the big current of start-up course;
In C, running, by AC/DC transducer, A phase, C phase are compared with Rated motor value; During as occurred that overload needs to protect, through time delay, driving protection component action, disconnecting and running circuit;
D, no current tripping operation is set: when after delayed startup, occur that detected loop does not have an electric current time, namely think open-phase fault, through time delay, protection component action, disconnects and runs circuit;
E, arrange tripping operation resetting time; After the time that tripping operation resets, protection component releases resets, ready for restarting.
In described B, the time of time delay is 5 seconds.
In described C, the time of time delay is 5 seconds.
In described D, the time of time delay is 1 second.
In described E, resetting time of tripping is 5 ~ 6 minutes.
The present invention adopts technique scheme, utilizes the analog module of PLC control system and AC current transducer to realize the defencive function of motor overload and phase shortage; When phase shortage or overload occur, PLC program will cut off motor power by Control, realize the protection to motor, and can prevent from artificially protection seting value being tuned up the shielding failure problem brought, effectively protect motor safety to run, decrease equipment fault, greatly reduce maintenance cost; After fault occurs, automatically reset in setting-up time, decrease the artificial workload resetted, recovery operation state, decreasing former protection needs the artificial workload resetted.
Accompanying drawing explanation
Here is the brief description of content shown in accompanying drawing:
Fig. 1 is basic control circuit schematic diagram of the present invention;
Fig. 2 is the program block ladder diagram of electric motor starting part;
Fig. 3 is the program block ladder diagram of motor overload part;
Fig. 4 is the program block ladder diagram of motor phase failure and reset part.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.
Structure of the present invention expressed by Fig. 1, be effectively applied in motor overload on cast tube production line and open-phase protection circuit for a kind of, mair motor is the grinding head motor of 22kW, is three phase electric machine, by ZK switch access three phase mains.
Described motor overload and open-phase protection circuit are provided with PLC control system; the main circuit of described motor is controlled by the main contact of A.C. contactor KM; the coil of described A.C. contactor is controlled by the contact of relay J 1, and the coil of described relay is controlled by described PLC control system.
In order to solve prior art Problems existing and overcome its defect, realize the goal of the invention of the protection of motor overload and phase shortage, the technical scheme that the present invention takes is:
As shown in Figure 1; cast tube production line motor overload of the present invention and open-phase protection circuit; on the quarter-phase circuit of the main circuit of described motor, respectively arrange an AC current transducer (BSQ1 and BSQ2), described AC current transducer is connected with described PLC control system.
Concrete method is: original electronic protector is controlled to remove, AC current transformer is pressed the circuit shown in Fig. 1 by connection.Utilize the analog quantity channel in PLC control system, and current transducer of increasing exchanges (its specifications and models are FZ20-I, AC0-100A); the alternating current of 0-100A is converted to the current signal of 4-20mA; according to the size of power of motor, processed by program, protected.
Technique scheme of the present invention, utilizes analog module and the AC current transducer of PLC control system, realizes the defencive function of motor overload and phase shortage.When phase shortage or overload occur, PLC program will cut off motor power by Control, realize the protection to motor; and can prevent from artificially protection seting value being tuned up the shielding failure problem brought; effectively protect motor safety to run, decrease equipment fault, greatly reduce maintenance cost.
QA is external start button, and TA is external stop button.
Described PLC accesses single phase poaer supply by ZK2.
Described protective circuit is provided with human-computer interaction device.
The present invention utilizes the PLC control system of equipment, accurately protection motor overload and phase shortage, and can by tripping operation information displaying in man-machine interface, and layman cannot arbitrarily adjust, thus effectively protects motor overload damage.
Described protective circuit is provided with AC/DC transducer, and described relay is arranged in the DC circuit of AC/DC transducer.AC/DC transducer accesses single phase poaer supply by ZK1.
In order to realize the goal of the invention identical with technique scheme, present invention also offers the guard method of above-described cast tube production line motor overload and open-phase protection circuit employing, its function is realized controlling by the program in Fig. 2 ~ Fig. 4, completes protection process.
Its technical scheme is described guard method:
As shown in Figure 2, its line number 1 (functional description), line number 2:
By the operation of startup, stop button, operating element controls startup and the stopping of grinding head motor; When there is overload or phase shortage in running, protection act element, by deferred action, disconnects and runs circuit.
Wherein, I00001 is bistrique start button, and I00002 is bistrique stop button, and M00001 is protection act button, and Q00001 is the executive component run, and can realize self-locking.
Line number 3 (functional description), line number 4:
When bistrique starts, after time delay, enter guard mode, escape the big current of start-up course.The time of time delay is 5 seconds.
Q00001 runs, and by timer (TMR TENTHS R00001) timing, after 5 seconds, M00002 time delay drops into and starts, to the line number 8 in Fig. 3 and line number 9.(the R00001 set point 50-PV in delay time and figure)
Within this 5 second time, Q00001 runs, and can not be subject to the impact of M00002, M00001, namely escape the big current of start-up course.
As shown in Figure 3, in running, by AC/DC transducer, A phase, C phase are compared with Rated motor value; During as occurred that overload needs to protect, through time delay, driving protection component M00001 action, disconnecting and run circuit (line number 2); The time of time delay is 5 seconds.
Its line number 5 to line number 7 is functional description.
M00002 start-up study in its line number 8, line number 9, makes comparator device (LT INT) be compared with motor set point by the current signal of the AI0002 of AI0001, B phase of A phase (after unsteady flow) respectively;
If reach rated value, through timer (being respectively TMR TENTHS R00004 and TMRTENTHS R00007) timing, after 5 seconds, M00001 protection act, makes the M00001 action in line number 2, cuts off Q00001, bistrique is stopped.(R00004 and the R00007 set point 50-PV in delay time and figure)
If do not reach rated value, then M00001 is failure to actuate, and bistrique normally works.
The determination of the set point 11744 in figure, its expression formula is:
11744＝44×160×1.1+4000
Wherein, 44 is the rated current of motor; 160 is every Ampere currents respective value; 1.1 represent amplification 10%; 4000 is the baseline values of comparator device.
As shown in Figure 4:
Line number 10 is functional description.
No current tripping operation is set: when after delayed startup, occur that detected loop does not have an electric current time, namely think open-phase fault, through time delay, protection component action, disconnects and runs circuit; The time of time delay is 5 seconds.
Line number 11, line number 12:
M00002 start-up study, the current signal of the AI0002 of AI0001, B phase of A phase (after unsteady flow) compares with motor set point by two comparator device (GT INT) respectively; The time of time delay is 1 second.
Once be less than 4400, by timer (TMR TENTHS R00010 and TMR TENTHSR00013) timing, M00001 protection act, makes the M00001 action in line number 2, cuts off Q00001, bistrique is stopped.(R00010 and the R00013 set point 10-PV in delay time and figure)
Line number 13 (functional description):
Resetting time of tripping is set; After the time that tripping operation resets, protection component releases resets, ready for restarting.Tripping operation resetting time be 5 ~ 6 minutes.(being 5 minutes in this example)
Line number 14:
After M00001 protection act, pass through by timer (TMR TENTHS R00016) timing 5 minutes (300 seconds), M00001 protection act resets, and the Q00001 in line number 1 is recovered, by start button, again resumes work.(the R00016 set point 3000-PV in delay time and figure)
When there is overload action, only need wait for 5 ~ 6 minutes (program inner setting), can automatically reset.This has just reminded post to need to adjust plant equipment, otherwise also can protection act.
When an error occurs, (be generally set as 5 ~ 6 minutes) and automatically reset, recovery operation state in setting-up time, decreasing former protection needs the artificial workload resetted.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (3)
1. cast tube production line motor overload and open-phase protection circuit, be provided with PLC control system, described motor is three phase electric machine, the main circuit of described motor is controlled by the main contact of A.C. contactor, the coil of described A.C. contactor is controlled by the contact of relay, and the coil of described relay is controlled by described PLC control system;
It is characterized in that:
On the quarter-phase circuit of the main circuit of described motor, respectively arrange an AC current transducer, described AC current transducer is connected with described PLC control system.
2. according to cast tube production line motor overload according to claim 1 and open-phase protection circuit, it is characterized in that: described protective circuit is provided with human-computer interaction device.
3. according to cast tube production line motor overload according to claim 1 and open-phase protection circuit, it is characterized in that: described protective circuit is provided with AC/DC transducer, described relay is arranged in the DC circuit of AC/DC transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410801908.2A CN104410048A (en) | 2014-12-19 | 2014-12-19 | Motor overload and default phase protection circuit on cast tube production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410801908.2A CN104410048A (en) | 2014-12-19 | 2014-12-19 | Motor overload and default phase protection circuit on cast tube production line |
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| Publication Number | Publication Date |
|---|---|
| CN104410048A true CN104410048A (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410801908.2A Pending CN104410048A (en) | 2014-12-19 | 2014-12-19 | Motor overload and default phase protection circuit on cast tube production line |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201860093U (en) * | 2010-11-14 | 2011-06-08 | 龙口矿业集团有限公司 | Overload early warning protecting device for conveying belt motor of conveyer |
| CN102324734A (en) * | 2011-09-14 | 2012-01-18 | 埃美圣龙(宁波)机械有限公司 | Default phase protecting method and device for three-phase motor |
| CN204407865U (en) * | 2014-12-19 | 2015-06-17 | 芜湖新兴铸管有限责任公司 | Cast tube production line motor overload and open-phase protection circuit |
-
2014
- 2014-12-19 CN CN201410801908.2A patent/CN104410048A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201860093U (en) * | 2010-11-14 | 2011-06-08 | 龙口矿业集团有限公司 | Overload early warning protecting device for conveying belt motor of conveyer |
| CN102324734A (en) * | 2011-09-14 | 2012-01-18 | 埃美圣龙(宁波)机械有限公司 | Default phase protecting method and device for three-phase motor |
| CN204407865U (en) * | 2014-12-19 | 2015-06-17 | 芜湖新兴铸管有限责任公司 | Cast tube production line motor overload and open-phase protection circuit |
Non-Patent Citations (1)
| Title |
|---|
| 代保川: "PLC单相电流取样在选煤厂自动控制系统中实现电机智能保护", 《电工技术》 * |
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Application publication date: 20150311 |
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