CN103904984B - A kind of voltage shock avoiding motor intelligent manager and method - Google Patents
A kind of voltage shock avoiding motor intelligent manager and method Download PDFInfo
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- CN103904984B CN103904984B CN201410127896.XA CN201410127896A CN103904984B CN 103904984 B CN103904984 B CN 103904984B CN 201410127896 A CN201410127896 A CN 201410127896A CN 103904984 B CN103904984 B CN 103904984B
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Abstract
The present invention provides a kind of voltage shock avoiding motor intelligent manager; including the processor CPU being located within intelligent supervisor and be located at the start and stop loop outside intelligent supervisor; this start and stop loop includes terminals DO1, DO2 and COM1, the DC source converting unit AD that also includes being arranged in intelligent supervisor, energy-storage units DE, electric current output control unit DC, loop permutator CW.The present invention also provides for a kind of voltage shock avoiding motor intelligent management method, including step 1) voltage detecting；2) electrical equipment working method；3) breakdown judge；4) process is controlled.The present invention can when abnormity of power supply according to change in voltage situation, automatically electrical equipment duty is adjusted, keep A.C. contactor KM not out of service to ensure the normal operation of the technological process of production to greatest extent, A.C. contactor out of service can be made again automatically to rework when voltage recovers, can also distinguish between fault type, excise fault in time.
Description
Technical field
The present invention relates to a kind of voltage shock avoiding motor intelligent manager and method.
Background technology
Using motor in process control loops in a large number, startup and the stopping of motor are generally controlled by motor intelligent manager (also referred to as motor controller), when abnormity of power supply, A.C. contactor can be caused to thread off, and impact controls the properly functioning of loop.
Current voltage shock avoiding method, motor intelligent manager or voltage shock avoiding auxiliary power module all can not meet the voltage shock avoiding requirement of technological process because of the limitation of its control method.The voltage shock avoiding function of motor intelligent manager is simply when abnormity of power supply, control loop is remained up, although controlling loop to connect, but A.C. contactor is because of abnormity of power supply, still can discharge, cause the electrical equipments such as motor out of service, this voltage shock avoiding function is simply when voltage recovers normal, A.C. contactor can be made to rerun, A.C. contactor can not be kept at abnormity of power supply normal operation, this control mode also only considered the working condition of individual A.C. contactor, do not account for the A.C. contactor impact on whole electric power system, also without considering how to ensure to greatest extent the normal operation of production process from production technology aspect.
Voltage shock avoiding auxiliary power module only considered voltage, without distinguishing rolling electricity Producing reason, as caused power-supply fluctuation because of electricity consumption side (motor) fault, at this moment voltage shock avoiding auxiliary power module still makes A.C. contactor maintenance work, fault is made not excise in time, cause fault to continue to occur, make loss expand and have influence on the normal operation of whole electric power system.
Summary of the invention
The invention aims to overcome the voltage shock avoiding function of existing motor intelligent manager only to keep controlling loop connect, A.C. contactor can not be kept properly functioning, automatically the shortcoming that can not adjust according to voltage pulsation degree, and the shortcoming that voltage shock avoiding auxiliary power module cannot distinguish between fault type, provide a kind of voltage shock avoiding motor intelligent manager, the solution abnormity of power supply impact on production technology of system.
For this; the invention provides a kind of voltage shock avoiding motor intelligent manager; including the processor CPU being arranged within intelligent supervisor and be located at the start and stop loop outside intelligent supervisor; this start and stop loop includes opening SF, stop SS controls switch and terminals DO1, DO2 and COM1, the DC source converting unit AD that also includes being arranged in intelligent supervisor, energy-storage units DE, electric current output control unit DC, loop permutator CW；
Loop permutator CW is single-pole double-throw switch (SPDT), and including CW-1 end and two ports of CW-2 end, CW-1 end and CW-2 end form two electricity consumption loops with terminals COM1, DO2 and the outfan of electric current output control unit DC, terminals DO2 respectively；The input of DC source converting unit AD electrically connects with alternating current power supply L end, and this DC source converting unit AD outfan electrically connects with the input of electric current output control unit DC, energy-storage units DE charging end simultaneously.
Meanwhile, present invention also offers a kind of voltage shock avoiding motor intelligent management method, comprise the following steps: 1) voltage detecting: voltage is measured by processor CPU；
2) electrical equipment working method: when electrical equipment is run, have two kinds of working methods: A alternate current operation mode, circuit switching CW-1 termination is logical, and CW-2 end disconnects, and provides alternating current to electrical equipment；B DC operation mode, circuit switching CW-1 end disconnects, and CW-2 termination is logical, provides unidirectional current to electrical equipment；
3) breakdown judge: according to voltage and current sample value, processor CPU judges whether power failure occurs and reason, if source-side fault causes voltage pulsation, it is necessary to electrical equipment continues to run with when power-supply fluctuation, then be controlled by step 4)；Electricity consumption side fault causes voltage pulsation in this way, it is not necessary to electrical equipment continues to run with when power-supply fluctuation, then be controlled or directly disconnect current supply circuit according to step 5), uses equipment out of service, or step 5) and disconnection current supply circuit perform simultaneously；If the electric current of motor intelligent manager judges that speed is slow, even if or when step 4) works, the current supply circuit of electrical equipment can also be disconnected or have other reason, this step only can judge whether power supply breaks down, as long as fault occurs just to be controlled by step 4), need not distinguish fault is source-side fault or electricity consumption side fault；
4) judgement according to step 3), electrical equipment is needed to continue to run with when power-supply fluctuation, when being alternate current operation mode such as working method, CPU controls the CW-2 end conducting of loop permutator CW, CW-1 end is not turned on, supplied electric current output control unit DC by energy-storage units DE, electric current output control unit DC provide unidirectional current to A.C. contactor KM；When being DC operation mode such as working method, step 4) is skipped；
5) when meeting following condition for the moment, A electricity consumption side fault causes voltage pulsation, B voltage pulsation exceedes voltage and the time range of setting, C detects signal out of service, CPU controls loop permutator CW-1 end conducting, CW-2 end is not turned on, and CPU also can control switching off between CW and terminals DO2 simultaneously, makes A.C. contactor KM out of service, above-mentioned condition can select according to practical situation, and what select in A, B, C is one or more.
Described step 2) electrical equipment working method: when electrical equipment normal operation; A.C. contactor KM adhesive; there are two kinds of working methods: A alternate current operation mode; CPU controls the CW-1 end conducting of loop permutator CW; CW-2 end is not turned on; low-voltage AC passes through the DO2 of start and stop loop, terminals COM1, the CW-1 end of loop permutator CW, voltage shock avoiding motor intelligent manager, provides alternating current to A.C. contactor KM；B DC operation mode, CPU controls the CW-1 end of loop permutator CW and is not turned on, and CW-2 end turns on, and converts alternating current to unidirectional current by DC source converting unit AD, supply electric current output control unit DC, is provided unidirectional current by electric current output control unit DC to A.C. contactor KM；Simultaneously low-voltage AC converts alternating current to unidirectional current through DC source converting unit AD and charges to energy-storage units DE；Both working methods can be fixed and be selected one of which, or allow user set according to field condition.
Described step 4) is for alternate current operation mode, when power-supply fluctuation needs A.C. contactor KM to continue to run with, CPU controls the CW-1 end of circuit switching and disconnects, CW-2 end turns on, continued to provide unidirectional current to A.C. contactor KM by electric current output control unit DC by energy-storage units DE, maintain the operation of A.C. contactor KM.
The invention have the advantage that can when abnormity of power supply according to change in voltage situation, automatically electrical equipment duty is adjusted, keep A.C. contactor KM normal operation to ensure the technological process of production not out of service to greatest extent and to the impact of system in allowed band, A.C. contactor out of service can be made again automatically to rework when voltage recovers, can also distinguish between fault type, excise fault in time.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is the voltage shock avoiding motor intelligent manager schematic diagram of the present invention；
Fig. 2 is current conversion unit AD circuit diagram；
Fig. 3 is that processor CPU controls schematic diagram.
Description of reference numerals: 1, start and stop loop；L, N: alternating current power supply；SS: stop button；SF: start button；AD: DC source converting unit；DE: energy-storage units；DC: electric current output control unit；CW: loop permutator；CW-1 end, CW-2 end: the two ends of loop permutator CW；KM: A.C. contactor；DO1, DO2, COM1: terminals；R64, R65, R66, R67, R68, R78: resistance；D12, D13, D21, D33, D34, D35: diode；E5, E6, E7, E9: electrochemical capacitor；L2: inductance；VCC: out-put supply；VDD: out-put supply；V1: integration module；Vin:V1 input；Vout:V1 outfan；GND: earth terminal；U4: integrated circuit；C3: electric capacity.
Detailed description of the invention
In order to solve the shortcoming that existing voltage shock avoiding motor intelligent manager can not adjust automatically according to voltage pulsation degree; present embodiments provide a kind of voltage shock avoiding motor intelligent manager as shown in Figure 1; including the processor CPU being arranged within intelligent supervisor and be located at the start and stop loop 1 outside intelligent supervisor; this start and stop loop 1 includes opening SF, stop SS controls switch and terminals DO1, DO2 and COM1, the DC source converting unit AD that also includes being arranged in intelligent supervisor, energy-storage units DE, electric current output control unit DC, loop permutator CW；
Loop permutator CW is single-pole double-throw switch (SPDT), and including CW-1 end and two ports of CW-2 end, CW-1 end and CW-2 end form two electricity consumption loops with terminals COM1, DO2 and the outfan of electric current output control unit DC, terminals DO2 respectively；Loop permutator CW and electric current output control unit DC outfan electrically connect, current conversion unit AD and processor CPU electrically connects, processor CPU outputs signal to loop permutator according to voltage, current sampling data and time sampled value, controls the connecting and disconnecting of loop permutator CW-1 end and CW-2 end；
The input of DC source converting unit AD electrically connects with alternating current power supply L end, and this DC source converting unit AD outfan electrically connects with the input of electric current output control unit DC, energy-storage units DE charging end simultaneously.
As shown in Figure 2, alternating current power supply L end is serially connected in the pin 1 of U4 successively by R78 with D21, R64, R66, the outfan of D21 is connected with the pin 7 of U4, pin 8 respectively by R65, the other end of alternating current power supply is connected with the pin 5 of U4, pin 6 respectively by D33, E7 is connected between the outfan of D21 and the input of D33, the outfan of D33 concatenates with the Vin end of R67, L2 and V1 successively, and the pin 2 of U4 is connected by the outfan of D34, D35 and L2, wherein D35 reversal connection；Vin and VDD connects, E6 and R68 is attempted by between VDD and earth terminal, and the input of D33 is connected with earth terminal, the Vout end of V1 concatenates with D13, VCC successively, the GND end of V1 and D12 are serially connected in earth terminal, and C3 is connected between the input of D13 and earth terminal, and E9 is serially connected between VCC and earth terminal.
E7 capacitance in energy-storage units DE available current converting unit AD strengthens and replaces, also the 560 μ/400V electrochemical capacitor that can be used alone is attempted by E7 two ends, or 4700 μ/25V electrochemical capacitor is attempted by the two ends of E6, VCC out-put supply is 5V, VDD outfan is 12 ~ 15V.
In the present embodiment, U4 is the intelligent switch controller integrated circuit of a high-performance electric die pressing type, model is CP8030, the model of V1 is 78L05, it it is a kind of three-terminal voltage-stabilizing feed regulator isolator, electric current output control unit DC is 3W adjustable resistance or fixed value resistance (5 ~ 100 Europe), loop permutator CW uses the relay with one group of changeover contact, such as the HF33-Z type relay of grand.
When power supply is normal, start button SF Guan Bi, alternating current power supply enters into A.C. contactor KM, KM adhesive by SS, SF, COM1, CW-1 end, terminals DO2, and electrical equipment is started working, at this moment loop permutator CW-1 termination is logical, CW-2 end disconnects, it is provided that to A.C. contactor KM alternating current, simultaneously, low-voltage alternating-current passes through L through DC source converting unit AD and electrically connects, and converts alternating current to unidirectional current and powers to energy-storage units DE and electric current output control unit DC.During A.C. contactor KM normal operation, the CW-2 end loop conducting of loop permutator CW can also be controlled by voltage shock avoiding motor intelligent manager, CW-1 end loop disconnects, low-voltage alternating-current converts alternating current to unidirectional current by DC source converting unit AD, supply electric current output control unit DC, by electric current output control unit DC to A.C. contactor KM for unidirectional current.
As shown in Figure 3, by processor CPU, voltage, electric current and time are set, and voltage, electric current are detected in real time, processor CPU outputs signal to loop permutator according to real-time testing result, controls loop permutator CW-1 end and the connecting and disconnecting of CW-2 end (following voltage definite value V1, V2, V3 and time definite value T1, T2, T3 are setting value):
A, voltage L are more than the first voltage set point V1; power supply is normal working voltage; during A.C. contactor KM normal operation; it is connected between start and stop circuit connection end COM1 and terminals DO2 by a road CW-1 end of loop permutator CW; low-voltage ac voltage is made to be carried in the two ends of A.C. contactor KM; A.C. contactor KM adhesive, keeps duty constant；
B, voltage less than the first voltage set point V1 more than the second voltage set point V2, electric voltage exception.If electric voltage exception is to be caused by source-side fault; control loop permutator CW-2 termination logical (disconnection of CW-1 end); CW-2 end one end is connected between electric current output control unit DC and start and stop circuit connection end DO2, makes energy-storage units DE provide unidirectional current by electric current output control unit DC to A.C. contactor KM；
C, voltage are less than the second voltage set point V2, or although voltage does not exceed setting time T1 less than V2 but time, or receive signal out of service, the CW-1 termination of loop permutator CW is logical, CW-2 end disconnects, also can simultaneously switch off the switch between permutator CW and the DO2 of loop, make A.C. contactor out of service；
D, A.C. contactor are out of service more than T1 less than V2 or time because of voltage, as, when voltage recovers normal in setting time T2 (more than V3), after delay adjustments time T3, the switch between Guan Bi DO1 and COM1, startup A.C. contactor reruns.
Survey fault when power supply to cause in voltage pulsation and the voltage that can bear in electric power system and time range, energy-storage units DE continue power supply；If fault is caused by electricity consumption side (motor), or voltage pulsation exceeds system and can bear voltage and time range, or when receiving signal out of service, direct current power supply loop CW-2 end (connecting CW-1 end) is disconnected by loop permutator CW, also can simultaneously switch off the switch between CW and terminals DO2, make A.C. contactor out of service；If after A.C. contactor is out of service because of source-side fault voltage pulsation, within the time set, voltage recovers again normal, voltage shock avoiding motor intelligent manager, according to the switch Guan Bi controlled after the delay time set between DO1 and COM1, starts A.C. contactor work.
In sum, this voltage shock avoiding motor intelligent manager provided by the invention, can when abnormity of power supply according to change in voltage situation, automatically electrical equipment duty is adjusted, keep A.C. contactor KM normal operation to ensure the technological process of production not out of service to greatest extent and to the impact of system in allowed band, A.C. contactor out of service can be made again automatically to rework when voltage recovers, it is also possible to distinguish fault type, excise fault in time.
Exemplified as above is only illustration to the present invention, is not intended that the restriction to protection scope of the present invention, every belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (3)
1. a voltage shock avoiding motor intelligent management method, it is characterised in that: comprise the following steps:
1) voltage detecting: voltage is measured by processor CPU；
2) electrical equipment working method: when electrical equipment is run, have two kinds of working methods: A alternate current operation mode, circuit switching CW-1 termination is logical, and CW-2 end disconnects, and provides alternating current to electrical equipment；B DC operation mode, circuit switching CW-1 end disconnects, and CW-2 termination is logical, provides unidirectional current to electrical equipment；
3) breakdown judge: according to voltage and current sample value, processor CPU judges whether power failure occurs and reason, if source-side fault causes voltage pulsation, it is necessary to electrical equipment continues to run with when power-supply fluctuation, then be controlled by step 4)；Electricity consumption side fault causes voltage pulsation in this way, it is not necessary to electrical equipment continues to run with when power-supply fluctuation, then be controlled or directly disconnect current supply circuit according to step 5), uses equipment out of service, or step 5) and disconnection current supply circuit perform simultaneously；If the electric current of motor intelligent manager judges that speed is slow, even if or when step 4) works, the current supply circuit of electrical equipment can also be disconnected or have other reason, this step only can judge whether power supply breaks down, as long as fault occurs just to be controlled by step 4), need not distinguish fault is source-side fault or electricity consumption side fault；
4) judgement according to step 3), electrical equipment is needed to continue to run with when power-supply fluctuation, when being alternate current operation mode such as working method, CPU controls the CW-2 end conducting of loop permutator CW, CW-1 end is not turned on, supplied electric current output control unit DC by energy-storage units DE, electric current output control unit DC provide unidirectional current to A.C. contactor KM；When being DC operation mode such as working method, step 4) is skipped；
5) when meeting following condition for the moment, A electricity consumption side fault causes voltage pulsation, B voltage pulsation exceedes voltage and the time range of setting, C detects signal out of service, CPU controls loop permutator CW-1 end conducting, CW-2 end is not turned on, and CPU also can control switching off between CW and terminals DO2 simultaneously, makes A.C. contactor KM out of service, above-mentioned condition can select according to practical situation, and what select in A, B, C is one or more.
2. a kind of voltage shock avoiding motor intelligent management method according to claim 1; it is characterized in that: described step 2) electrical equipment working method: when electrical equipment normal operation; A.C. contactor KM adhesive; there are two kinds of working methods: A alternate current operation mode; CPU controls the CW-1 end conducting of loop permutator CW; CW-2 end is not turned on; low-voltage AC passes through the DO2 of start and stop loop, terminals COM1, the CW-1 end of loop permutator CW, voltage shock avoiding motor intelligent manager, provides alternating current to A.C. contactor KM；B DC operation mode, CPU controls the CW-1 end of loop permutator CW and is not turned on, and CW-2 end turns on, and converts alternating current to unidirectional current by DC source converting unit AD, supply electric current output control unit DC, is provided unidirectional current by electric current output control unit DC to A.C. contactor KM；Simultaneously low-voltage AC converts alternating current to unidirectional current through DC source converting unit AD and charges to energy-storage units DE；Both working methods can be fixed and be selected one of which, or allow user set according to field condition.
3. a kind of voltage shock avoiding motor intelligent management method according to claim 1, it is characterized in that: described step 4) is for alternate current operation mode, when power-supply fluctuation needs A.C. contactor KM to continue to run with, CPU controls the CW-1 end of circuit switching and disconnects, CW-2 end turns on, continued to provide unidirectional current to A.C. contactor KM by electric current output control unit DC by energy-storage units DE, maintain the operation of A.C. contactor KM.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201402967Y (en) * | 2009-04-23 | 2010-02-10 | 东营华泰热力有限责任公司 | Anti-electricity dazzling device |
| CN102122839A (en) * | 2011-01-18 | 2011-07-13 | 西安润辉科技发展有限公司 | Electric-dazzling prevention auxiliary power supply in low-voltage alternating current control loop and power supply method thereof |
| CN102709116A (en) * | 2012-06-28 | 2012-10-03 | 西安润辉科技发展有限公司 | Alternating-current contactor in low-voltage alternating-current control circuit and control method of alternating-current contactor |
| CN204031039U (en) * | 2014-04-01 | 2014-12-17 | 西安润辉科技发展有限公司 | A kind of voltage shock avoiding motor intelligent manager |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02155437A (en) * | 1988-11-07 | 1990-06-14 | Toshiba Corp | Controlling method for operation of system interlocking inverter device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201402967Y (en) * | 2009-04-23 | 2010-02-10 | 东营华泰热力有限责任公司 | Anti-electricity dazzling device |
| CN102122839A (en) * | 2011-01-18 | 2011-07-13 | 西安润辉科技发展有限公司 | Electric-dazzling prevention auxiliary power supply in low-voltage alternating current control loop and power supply method thereof |
| CN102709116A (en) * | 2012-06-28 | 2012-10-03 | 西安润辉科技发展有限公司 | Alternating-current contactor in low-voltage alternating-current control circuit and control method of alternating-current contactor |
| CN204031039U (en) * | 2014-04-01 | 2014-12-17 | 西安润辉科技发展有限公司 | A kind of voltage shock avoiding motor intelligent manager |
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