CN203707753U - Operation protection circuit for inverter - Google Patents
Operation protection circuit for inverter Download PDFInfo
- Publication number
- CN203707753U CN203707753U CN201320848827.9U CN201320848827U CN203707753U CN 203707753 U CN203707753 U CN 203707753U CN 201320848827 U CN201320848827 U CN 201320848827U CN 203707753 U CN203707753 U CN 203707753U
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- CN
- China
- Prior art keywords
- frequency converter
- contactor
- protection circuit
- stop button
- auxiliary relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides an operation protection circuit for an inverter, which comprises a contactor, a start button, a stop button and an intermediate relay, wherein the normally open contact of the intermediate relay is in parallel connection with the stop button; and the coil of the intermediate relay is in serial connection with an operation switch of the inverter. Therefore, when the operation switch of the inverter is closed, the coil of the intermediate relay is energized, the normally open contact of the intermediate relay is closed, and the stop button is short-circuited. When the inverter needs to stop operation, the stop button is directly operated. As the normally open contact of the intermediate relay is short-circuited, the stop button does not work, and the inverter stops working only in a normal operation mode that the switch button of the inverter is closed firstly and the stop button is then closed. Thus, damage to the inverter as the stop button is directly operated by working staff can be effectively avoided, and the service life of the inverter is prolonged.
Description
Technical field
The utility model relates to converter technology field, more particularly, relates to a kind of running protection circuit of frequency converter.
Background technology
Frequency converter (Variable-frequency Drive, VFD) is a kind of application converter technique and microelectric technique, controls the electric control appliance of alternating current motor by changing the working power frequency mode of motor.The electricity of frequency converter output at present to the start/stop control procedure of motor is: when startup, first operation start button is switched on to frequency converter, then starts frequency converter shift knob, thereby frequency converter output electricity is to motor, makes motor obtain electric operation; While stopping, first close frequency converter shift knob, make frequency converter stop output electricity to motor, then operate stop button to frequency converter power-off, a work period completes.
But in actual mechanical process, a lot of staff's direct control stop buttons, to the unexpected power-off of frequency converter, now, the coasting of motor makes motor be transformed into generator, and because frequency converter power-off quits work, thereby frequency converter has not had discharge loop, make motor cause damage to the electricity of frequency converter output to frequency converter, cause the frequency converter life-span to reduce.
Utility model content
In view of this, the utility model provides a kind of running protection circuit of frequency converter, with the damage of avoiding because of staff's direct control stop button, frequency converter being caused, thus the useful life of prolongation frequency converter.
A kind of running protection circuit of frequency converter, be applied to frequency converter, described frequency converter comprises frequency converter main body, motor, frequency converter run switch, Frequency Converter Control coil and frequency converter shift knob, and described running protection circuit comprises: contactor, start button, stop button and auxiliary relay;
The main contact of described contactor and described frequency converter main body are connected between the first AC power and described motor;
Described stop button and described start button are connected between the second AC power and the coil of described contactor, the normally opened contact of described auxiliary relay and described stop button are connected in parallel, described contactor often drive auxiliary contact and described start button is connected in parallel;
Described frequency converter shift knob is connected between DC power supply and described Frequency Converter Control coil, described frequency converter run switch is connected between described DC power supply and the coil of described auxiliary relay, the coil of described auxiliary relay obtains electric after described frequency converter run switch closure, makes the normally opened contact closure of described auxiliary relay.
Preferably, the output voltage of described the first AC power is 380V.
Preferably, the output voltage of described the second AC power is 220V.
Preferably, the output voltage of described DC power supply is 24V.
Preferably, described auxiliary relay is NY series auxiliary relay.
Preferably, described auxiliary relay is MY series auxiliary relay.
Preferably, described contactor is A.C. contactor.
Preferably, described A.C. contactor is CJ Series AC Contactor.
Preferably, described A.C. contactor is B Series AC Contactor.
Preferably, between described the first AC power and described DC power supply, be connected in series with power transformer and rectification circuit.
Can find out from above-mentioned technical scheme; the utility model provides a kind of running protection circuit of frequency converter; comprise contactor, start button, stop button and auxiliary relay; wherein; normally opened contact and the stop button of auxiliary relay are connected in parallel, and the coil of auxiliary relay and frequency converter run switch are connected in series.Therefore, when after frequency converter run switch closure, the coil of auxiliary relay obtains electric, and the normally opened contact closure of auxiliary relay, makes stop button short circuit.In the time that needs quit work frequency converter, direct control stop button, due to the short circuit of the normally opened contact of auxiliary relay, make stop button inoperative, and can only be according to first closing frequency converter shift knob, then close the normal mode of operation of stop button, frequency converter is quit work, thereby effectively avoid damage frequency converter being caused because of staff's direct control stop button, extended the useful life of frequency converter.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram of the running protection circuit of the disclosed a kind of frequency converter of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Referring to Fig. 1, the utility model embodiment discloses a kind of circuit diagram of running protection circuit of frequency converter, described running protection circuit application is in frequency converter, described frequency converter comprises frequency converter main body 11, motor 12, frequency converter run switch S4, Frequency Converter Control coil KM2 and frequency converter shift knob S3, and described running protection circuit comprises: contactor KM1, start button S2, stop button S1 and auxiliary relay KA;
Wherein:
The main contact of contactor KM1 and frequency converter main body 11 are connected between the first AC power Vcc and motor 12;
Stop button S1 and start button S2 are connected on the second AC power (wherein, in Fig. 1, L1 represents the phase line of the second AC power, N represents the zero line of the second AC power) and the coil of contactor KM1 between, the normally opened contact of auxiliary relay KA and stop button S1 are connected in parallel, contactor KM1 often drive auxiliary contact and start button S2 is connected in parallel;
Frequency converter shift knob S3 is connected between DC power supply and Frequency Converter Control coil KM2, frequency converter run switch S4 is connected between described DC power supply and the coil of auxiliary relay KA, the coil of auxiliary relay KA obtains electric after frequency converter run switch S4 closure, makes the normally opened contact closure of auxiliary relay KA.
Concrete, frequency converter output electricity to the start/stop control procedure of motor 12 is:
When frequency converter starts, first operation start button S2, the coil of contactor KM1 obtains electric, and contactor KM1 often leaves the closed self-locking of auxiliary contact, the main contact closure of contactor KM1, frequency converter energising; Then start frequency converter shift knob S3, Frequency Converter Control coil KM2 obtains electric work, and frequency converter main body 11 output electricity are to motor 12, and motor 12 obtains electric operation.
When frequency converter stops, first closing frequency converter shift knob S3, Frequency Converter Control coil KM2 power-off, frequency converter main body 11 stops output electricity to motor 12, then operate stop button S1, frequency converter power-off, thus frequency converter output electricity completed to the start/stop work period of motor 12.
In the utility model, the normally opened contact of auxiliary relay KA and stop button S1 are connected in parallel, and the coil of auxiliary relay KA and frequency converter run switch S4 are connected in series.Therefore, when after frequency converter run switch S4 closure, the coil of auxiliary relay KA obtains electric, and the normally opened contact closure of auxiliary relay KA makes stop button S1 short circuit.In the time that needs quit work frequency converter; direct control stop button S1; due to the short circuit of the normally opened contact of auxiliary relay KA; make stop button S1 inoperative, and can only be according to first closing frequency converter shift knob S3, then close the normal mode of operation of stop button S1; frequency converter is quit work; thereby effectively avoid damage frequency converter being caused because of staff's direct control stop button S1, reduced frequency converter fault-free and shut down number of times, extended the useful life of frequency converter.
In the present embodiment, the output voltage of the first AC power Vcc is 380V.
The output voltage of the second AC power is 220V.
The output voltage of DC power supply is 24V.
It should be noted is that, between the first AC power Vcc and DC power supply, be connected in series with power transformer and rectification circuit (not shown in figure 1), power transformer is for carrying out step-down by the voltage of the first AC power Vcc output, obtain the alternating voltage after step-down, rectification circuit is for carrying out rectification by the alternating voltage after step-down, obtain direct voltage, this direct voltage is the voltage of DC power supply output.
Wherein, auxiliary relay KA can be NY series auxiliary relay, or is MY series auxiliary relay.
Contactor KM1 in the present embodiment is A.C. contactor.
A.C. contactor can be CJ Series AC Contactor, or is B series contactor.
It should be noted is that, as long as adopt the technological means of stop button S1 short circuit, reach the object of avoiding because of staff's direct control stop button S1, frequency converter being caused damage, is all protection ranges of the present utility model.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the running protection circuit of a frequency converter, it is characterized in that, be applied to frequency converter, described frequency converter comprises frequency converter main body, motor, frequency converter run switch, Frequency Converter Control coil and frequency converter shift knob, and described running protection circuit comprises: contactor, start button, stop button and auxiliary relay;
The main contact of described contactor and described frequency converter main body are connected between the first AC power and described motor;
Described stop button and described start button are connected between the second AC power and the coil of described contactor, the normally opened contact of described auxiliary relay and described stop button are connected in parallel, described contactor often drive auxiliary contact and described start button is connected in parallel;
Described frequency converter shift knob is connected between DC power supply and described Frequency Converter Control coil, described frequency converter run switch is connected between described DC power supply and the coil of described auxiliary relay, the coil of described auxiliary relay obtains electric after described frequency converter run switch closure, makes the normally opened contact closure of described auxiliary relay.
2. running protection circuit according to claim 1, is characterized in that, the output voltage of described the first AC power is 380V.
3. running protection circuit according to claim 1, is characterized in that, the output voltage of described the second AC power is 220V.
4. running protection circuit according to claim 1, is characterized in that, the output voltage of described DC power supply is 24V.
5. running protection circuit according to claim 1, is characterized in that, described auxiliary relay is NY series auxiliary relay.
6. running protection circuit according to claim 1, is characterized in that, described auxiliary relay is MY series auxiliary relay.
7. running protection circuit according to claim 1, is characterized in that, described contactor is A.C. contactor.
8. running protection circuit according to claim 7, is characterized in that, described A.C. contactor is CJ Series AC Contactor.
9. running protection circuit according to claim 7, is characterized in that, described A.C. contactor is B Series AC Contactor.
10. running protection circuit according to claim 1, is characterized in that, between described the first AC power and described DC power supply, is connected in series with power transformer and rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320848827.9U CN203707753U (en) | 2013-12-20 | 2013-12-20 | Operation protection circuit for inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320848827.9U CN203707753U (en) | 2013-12-20 | 2013-12-20 | Operation protection circuit for inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203707753U true CN203707753U (en) | 2014-07-09 |
Family
ID=51058135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320848827.9U Expired - Fee Related CN203707753U (en) | 2013-12-20 | 2013-12-20 | Operation protection circuit for inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203707753U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300273A (en) * | 2016-08-31 | 2017-01-04 | 苏州迈力电器有限公司 | Converter running protection circuit |
| CN106300274A (en) * | 2016-08-31 | 2017-01-04 | 苏州迈力电器有限公司 | Converter running protection circuit |
| CN106329485A (en) * | 2016-08-31 | 2017-01-11 | 苏州迈力电器有限公司 | Protection circuit based on frequency converter operation |
-
2013
- 2013-12-20 CN CN201320848827.9U patent/CN203707753U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300273A (en) * | 2016-08-31 | 2017-01-04 | 苏州迈力电器有限公司 | Converter running protection circuit |
| CN106300274A (en) * | 2016-08-31 | 2017-01-04 | 苏州迈力电器有限公司 | Converter running protection circuit |
| CN106329485A (en) * | 2016-08-31 | 2017-01-11 | 苏州迈力电器有限公司 | Protection circuit based on frequency converter operation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170321 Address after: 201500 Jinshan District Jinshan Town, the town of the second industrial zone, Shanghai Patentee after: SHANGHAI GOLD LION CHEMICAL CO., LTD. Address before: 610000 Xinjin, Sichuan Province, North Road, Tianjin, five Patentee before: Sichuan Dowell Technology Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20171220 |