CN201611381U - Motor over-average-load alarm in system with multiple motors driven by frequency converter - Google Patents
Motor over-average-load alarm in system with multiple motors driven by frequency converter Download PDFInfo
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- CN201611381U CN201611381U CN2010200328634U CN201020032863U CN201611381U CN 201611381 U CN201611381 U CN 201611381U CN 2010200328634 U CN2010200328634 U CN 2010200328634U CN 201020032863 U CN201020032863 U CN 201020032863U CN 201611381 U CN201611381 U CN 201611381U
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Abstract
The utility model relates to an alarm in a system with multiple motors driven by a frequency converter, in particular to a motor over-average-load alarm in a system with multiple motors driven by a frequency converter, which comprises a current signal taking circuit (11), a current signal rectifying circuit (12), a voltage signal integrating and comparing circuit (13), and an alarming, displaying and outputting circuit (14), wherein the current signal taking circuit (11) comprises a first current transformer (CT11) and a plurality of second current transformers (CT21...CTn1), the current signal rectifying circuit (12) comprises a bridge rectifying block, a capacitor and a current-limiting resistor, the voltage signal integrating and comparing circuit (13) comprises a comparator and a plurality of diodes, and the alarming, displaying and outputting circuit (14) comprises a triode, a resistor, a relay and a diode. The motor over-average-load alarm can effectively conduct real-time monitoring and alarming on the abnormal condition that in a multi-motor towing system, the load of a certain motor exceeds average load of motors of the same group and can not lead a breaker to trip.
Description
Technical field
The utility model relates to frequency converter and drives warning device in the multi-machine system, relates in particular to frequency converter and drives motor in the multi-machine system and cross and all carry alarm.
Background technology
In modern iron and steel hot rolling enterprise, all kinds of roller-ways on the equipment of hot rolling rolling line are to have the frequency converter of auxilliary gearing to drive mostly.For the ease of control roller table speed and saving cost of investment, frequency converter is not corresponding one by one driving with motor, but need drive one group of motor according to the every cover frequency converter of technological requirement, and every group has the 6-15 platform not wait, referring to Fig. 1.For current check and the maintenance need between frequency converter 1 and motor 2, be provided with the isolating switch dish.The mechanical load basically identical of every motor 2 in the production run process, if when the load of motor 2 is all excessive on the same group, frequency converter 1 can the newspaper overload fault and is tripped; If a certain motor overload operation on the same group in the motor 2 is owing to isolating switch 3 has short circuit, overload protection function trips.On supermatic tinuous production, in order to ensure product quality, above situation all can cause the machine halt trouble of rolling line.
Existing frequency converter lacks in above-mentioned transmission control and a kind of indivedual motor loads is surpassed motor average load on the same group and the abnormal conditions that do not reach circuit breaker trip can effectively be carried out the device of monitoring, alarming, causes machine halt trouble or quality accident after causing problem serious.Other has the roller jam and the roller-way that do not reach circuit breaker trip can produce velocity contrast with adjacent roller-way, also can cause scuffing to band steel lower surface.Shutdown inspection is handled owing to can not put into operation behind certain bench roller road motor overload in the production scene, the example of replacing roller-way takes place often; especially hot-rolled product is being influenced on the important thermal output roller-way; roller-way is stuck or jam is serious if there is one, all can cause scuffing and influence product quality band steel lower surface.
The utility model content
The purpose of this utility model is to provide the motor in a kind of frequency converter driving multi-machine system to cross and all carries alarm, this alarm can be to occurring in many motor driving systems that indivedual motor loads surpass motor average load on the same group and the abnormal conditions that do not reach circuit breaker trip can be monitored and report to the police effectively in real time.
The utility model is achieved in that a kind of frequency converter drives motor in the multi-machine system and crosses and all carry alarm, comprises and takes current signal circuit, current signal rectification circuit, the comprehensive comparator circuit of voltage signal and alarm indication and output circuit;
The described current signal circuit of taking is made up of one first current transformer and several second current transformers, first current transformer is installed on the frequency converter output three-phase alternating source circuit, and several second current transformers are installed in respectively on the incoming line that the three-phase alternating source inputs to some motors;
Described current signal rectification circuit is made up of bridge rectifier block, electric capacity and current-limiting resistance, first current transformer output termination, the first current signal rectification circuit, several second current transformer output terminals connect several second current signal rectification circuits respectively, bridge rectifier block input termination current signal, output terminal serial connection current-limiting resistance and electric capacity;
The comprehensive comparator circuit of described voltage signal is made up of comparer and several diodes, electric capacity two terminating resistors at the first current signal rectification circuit, electric capacity two ends at several second current signal rectification circuits connect several variable resistors respectively, several several diodes of variable resistor slip knee-joint, several diode outputs connect and connecting terminal, and connecting terminal output connects the comparer positive terminal, and the comparer negative phase end directly connects the electric capacity output terminal of the first current signal rectification circuit;
Described alarm indication and output circuit comprise triode, resistance, relay and diode, comparer output connects the base stage of triode, the collector of triode is also succeeded electrical equipment and diode, connecting resistance after relay and the diode parallel connection, another termination transistor base of resistance, transistor emitter ground connection.
Described alarm indication and output circuit also comprise light emitting diode, and light emitting diode string is succeeded behind the electrical equipment auxiliary contact one and terminated at diode and resistance tie point place, other end ground connection.
The turn ratio of described first current transformer is turn ratio n a times of second current transformer, and n is several second current transformer numbers.
The utility model is according to certain root roller-way jam in motor on the same group the electric current of drive motor is increased, and the load current of a motor is little to the average current influence of whole group motor after increasing, so the load current during certain root roller-way jam can surpass the characteristics of the average current of whole group motor, detects the situation that there is the misoperation of jam (not stuck) in roller-way.
The utility model can be to occurring in many motor driving systems that indivedual motor loads surpass motor average load on the same group and the abnormal conditions that do not reach circuit breaker trip can be monitored and report to the police effectively in real time.
Description of drawings
Fig. 1 drives the Circuits System synoptic diagram of many motors for existing frequency converter;
Fig. 2 is the Circuits System synoptic diagram that frequency converter that current transformer is housed drives many motors;
Fig. 3 crosses for the motor in the utility model frequency converter driving multi-machine system and all carries the alarm block scheme;
Fig. 4 is a voltage comparator input and output signal graph of a relation of the present utility model.
Fig. 5 crosses for the motor in the utility model frequency converter driving multi-machine system and all carries alarm circuit figure.
Among the figure: 1 frequency converter, 2 motors, 3 isolating switchs, 4 current transformers, 5 and connecting terminal, 11 take the current signal circuit, 12 current signal rectification circuits, the comprehensive comparator circuit of 13 voltage signals, 14 alarm indications and output circuit.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the motor in a kind of frequency converter driving multi-machine system is crossed and is all carried alarm, comprises and takes current signal circuit 11, current signal rectification circuit 12, the comprehensive comparator circuit 13 of voltage signal and alarm indication and output circuit 14;
The described current signal circuit 11 of taking is by one first current transformer CT11 and several second current transformers CT21 ... CTn1 forms, the first current transformer CT11 is installed on the frequency converter 1 output three-phase alternating source circuit, several second current transformers CT21 ... CTn1 is installed in respectively on the incoming line that the three-phase alternating source inputs to some motors 2.
Taking current signal mainly is that the input current signal of with the current transformer 4 of different turn ratios frequency converter 1 being exported total current and every motor 2 in the isolating switch dish takes out, referring to Fig. 2, the current transformer 4 of different turn ratios is decided on the platform number of one group of motor 2.There are 10 as one group of motor 2, the first current transformer CT11 turn ratio of frequency converter 1 total current is 100/1A, the second current transformer CT21 of every motor 2 then ... CTn1 is more consistent than the current signal size of the frequency converter 1 output total current signal that is 10/1A, makes to take out and every motor 2.
Described current signal rectification circuit 12 is made up of bridge rectifier block, electric capacity and current-limiting resistance, first current transformer CT11 output termination, the first current signal rectification circuit, several second current transformers CT21 ... the CTn1 output terminal connects several second current signal rectification circuits respectively, bridge rectifier block input termination current signal, output terminal serial connection current-limiting resistance and electric capacity.
Referring to Fig. 5, current signal rectification circuit 12 is to convert the total current signal of frequency converter 1 output and the ac current signal rectification of every motor 2 to voltage signal.Bridge rectifier block ZLQ11 ... ZLQn finishes alternating current and transfers DC voltage to; Capacitor C 11 ... Cn1 is the stable DC voltage signal in addition, for preventing to export excessive electric current; Adopt current-limiting resistance R11 ... Rn1 carries out current limliting.
The comprehensive comparator circuit 13 of described voltage signal is by comparer BJQ and several diodes D21 ... Dn1 forms, 11 liang of terminating resistor R12 of capacitor C at the first current signal rectification circuit, capacitor C 21 at several second current signal rectification circuits ... the Cn1 two ends meet several variable resistors R22 respectively ... Rn2, several variable resistors R22 ... several diodes of Rn2 slip knee-joint D21 ... Dn1, several diodes D21 ... Dn1 output connects and connecting terminal 5, and connecting terminal 5 is as logic sum gate, and connecting terminal 5 output connects comparer BJQ positive terminal, and comparer BJQ negative phase end directly connects capacitor C 11 output terminals of the first current signal rectification circuit.
The voltage signal of frequency converter 1 total current conversion is got the total head signal, and the voltage signal of every motor 2 current conversion is got voltage division signal after adopting the variable resistor dividing potential drop; The total head signal of frequency converter 1 output directly is added to the negative phase end of comparer BJQ amplifier, and the voltage division signal of every motor 2 carries out being added to after overall treatment becomes integrated signal the positive terminal of comparer BJQ amplifier through logic sum gate.
Described alarm indication and output circuit 14 comprise by triode BG1, resistance R 1, relay J and diode D1, comparer BJQ output connects the base stage of triode BG1, the collector of triode BG1 is also succeeded electrical equipment J and diode D1, connecting resistance R1 after relay J and the diode D1 parallel connection, resistance R 1 another termination triode BG1 base stage, triode BG1 grounded emitter.
Triode BG1, resistance R 1, relay J and diode D1 form monostable circuit.
Described alarm indication and output circuit 14 also comprise LED, and one terminates at diode D1 and resistance R 1 tie point place, other end ground connection behind the LED serial connection relay J auxiliary contact.
Relay J gets electricly when the monostable circuit state turnover, and simultaneously its auxiliary contact are that LED sends warning light.The supervisory circuit that other auxiliary contact of relay J can be delivered to the operator on duty realizes control warning far away.
Motor in the utility model frequency converter driving multi-machine system is crossed the principle of work of all carrying alarm and is:
Be installed on the three-phase alternating source circuit of frequency converter 1 output and be installed on the current transformer 3 that the three-phase alternating source inputs on the incoming line of some motors 2 and obtain frequency converter 1 output total current and every motor 2 input currents; Current signal converts the total current signal of frequency converter 1 output and the ac current signal rectification of every motor 2 to voltage signal behind the current signal rectification circuit; Voltage signal comprehensively relatively is with after the current commutates signal dividing potential drop of every motor on the same group and together in addition comprehensive, be about to the current value sum of every motor, referring to Fig. 4, commutating voltage full signal by voltage comparator B JQ and frequency converter total current compares, when integrated signal voltage comparer output negative level during less than the total current signal voltage; When integrated signal voltage comparer output positive level during greater than the total current signal voltage.
Can make the electric current integrated voltage rising of motor on the same group when certain root roller-way jam occurring, the monostable circuit state turnover sends and reports to the police and demonstration when the electric current integrated voltage of motor surpasses frequency converter total current signal voltage on the same group; The monostable circuit state keeps when the electric current integrated signal voltage of motor is no more than frequency converter total current signal voltage on the same group, does not send and reports to the police and demonstration.
Generally speaking, because the mechanical load that every motor drove is inconsistent, make integrated signal be greater than frequency converter total current signal voltage.So the current commutates signal voltage of every motor is carried out dividing potential drop by adjustable resistance, makes the current sampling signal voltage of every motor be slightly less than actual rectified signal voltage.In addition can adjust the amount that load current when jam occurring surpasses average load current by adjustable resistance.
The effect of alarm indication and output is the output voltage control monostable circuit with voltage comparator B JQ, and when voltage comparator output negative voltage, triode BG1 does not work; When voltage comparator output positive voltage, triode BG1 work, monostable circuit upset.Make relay J get electric, LED is luminous, sends the abnormal alarm signal, relay J auxiliary contact signal can be passed to operator on duty's supervisory system.
The utility model is frequency converter to be driven occur in the multi-machine system that indivedual motor loads surpass motor average load on the same group and the abnormal conditions that do not reach circuit breaker trip can be monitored and report to the police effectively in real time.
Claims (3)
1. a frequency converter drives motor in the multi-machine system and crosses and all carry alarm, and it is characterized in that: described alarm comprises takes current signal circuit (11), current signal rectification circuit (12), the comprehensive comparator circuit of voltage signal (13) and alarm indication and output circuit (14);
The described current signal circuit (11) of taking is made up of one first current transformer (CT11) and several second current transformers (CT21...CTn1), first current transformer (CT11) is installed on frequency converter (1) the output three-phase alternating source circuit, and several second current transformers (CT21...CTn1) are installed in respectively on the incoming line that the three-phase alternating source inputs to some motors (2);
Described current signal rectification circuit (12) is made up of bridge rectifier block, electric capacity and current-limiting resistance, first current transformer (CT11) output termination, the first current signal rectification circuit, several second current transformer (CT21...CTn1) output terminals connect several second current signal rectification circuits respectively, bridge rectifier block input termination current signal, output terminal serial connection current-limiting resistance and electric capacity;
The comprehensive comparator circuit of described voltage signal (13) is made up of comparer and several diodes, electric capacity (C11) two terminating resistors (R12) at the first current signal rectification circuit, electric capacity (C21...Cn1) two ends at several second current signal rectification circuits connect several variable resistors (R22...Rn2) respectively, several variable resistors (R22...Rn2) slip several diodes of knee-joint (D21...Dn1), several diodes (D21...Dn1) output connects and connecting terminal (5), and connecting terminal (5) output connects comparer (BJQ) positive terminal, and comparer (BJQ) negative phase end directly connects electric capacity (C11) output terminal of the first current signal rectification circuit;
Described alarm indication and output circuit (14) comprise triode, resistance, relay and diode, comparer (BJQ) output connects the base stage of triode (BG1), the collector of triode (BG1) is also succeeded electrical equipment (J) and diode (D1), relay (J) and diode (D1) back in parallel connecting resistance (R1), another termination triode (BG1) base stage of resistance (R1), triode (BG1) grounded emitter.
2. motor is crossed and is all carried alarm in the frequency converter driving multi-machine system according to claim 1, it is characterized in that: described alarm indication and output circuit (14) also comprise light emitting diode (LED), one terminates at diode (D1) and resistance (R1) tie point place, other end ground connection behind light emitting diode (LED) serial connection relay (J) auxiliary contact.
3. motor is crossed and is all carried alarm in the frequency converter driving multi-machine system according to claim 1 and 2, it is characterized in that: the turn ratio of described first current transformer (CT11) is turn ratio n a times of second current transformer, and n is several second current transformer numbers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200328634U CN201611381U (en) | 2010-01-08 | 2010-01-08 | Motor over-average-load alarm in system with multiple motors driven by frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200328634U CN201611381U (en) | 2010-01-08 | 2010-01-08 | Motor over-average-load alarm in system with multiple motors driven by frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201611381U true CN201611381U (en) | 2010-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010200328634U Expired - Fee Related CN201611381U (en) | 2010-01-08 | 2010-01-08 | Motor over-average-load alarm in system with multiple motors driven by frequency converter |
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| Country | Link |
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| CN (1) | CN201611381U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324731A (en) * | 2011-09-20 | 2012-01-18 | 广东天富电气集团有限公司 | A kind of motor protection pattern |
| CN106249147A (en) * | 2016-08-31 | 2016-12-21 | 枣庄矿业(集团)有限责任公司田陈煤矿 | Monitoring of running motors device |
| CN114755576A (en) * | 2022-04-15 | 2022-07-15 | 重庆钢铁股份有限公司 | Device and method for monitoring trip of roller way motor |
-
2010
- 2010-01-08 CN CN2010200328634U patent/CN201611381U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324731A (en) * | 2011-09-20 | 2012-01-18 | 广东天富电气集团有限公司 | A kind of motor protection pattern |
| CN106249147A (en) * | 2016-08-31 | 2016-12-21 | 枣庄矿业(集团)有限责任公司田陈煤矿 | Monitoring of running motors device |
| CN114755576A (en) * | 2022-04-15 | 2022-07-15 | 重庆钢铁股份有限公司 | Device and method for monitoring trip of roller way motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101020 Termination date: 20140108 |