CN203180767U - PLC-based control device for frequency-converter precharge circuit - Google Patents

PLC-based control device for frequency-converter precharge circuit Download PDF

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Publication number
CN203180767U
CN203180767U CN 201320202477 CN201320202477U CN203180767U CN 203180767 U CN203180767 U CN 203180767U CN 201320202477 CN201320202477 CN 201320202477 CN 201320202477 U CN201320202477 U CN 201320202477U CN 203180767 U CN203180767 U CN 203180767U
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CN
China
Prior art keywords
frequency converter
contactor
control
module
plc
Prior art date
Application number
CN 201320202477
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Chinese (zh)
Inventor
尹霖麒
郭建林
汪峰
贺钟咏
Original Assignee
上海赛德造纸机械电控技术有限公司
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Priority to CN 201320202477 priority Critical patent/CN203180767U/en
Application granted granted Critical
Publication of CN203180767U publication Critical patent/CN203180767U/en

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Abstract

The utility model relates to a PLC-based control device for a frequency-converter precharge circuit. The circuit control device includes a pre-contactor, a precharge resistor, a frequency converter and a controller; a normally closed contact and a normally open contact of the pre-contactor are connected with input interfaces of the frequency converter respectively; the precharge resistor is arranged between the normally open contact of the contactor and the pre-frequency-converter so that an input power source of the frequency converter is formed; the output end of the frequency converter is connected to the input end of the controller and is connected back to the other input end of the pre-contactor through the output end of the controller. The PLC-based control device is characterized in that the control device is composed of a PLC module electrically connected with the output end of the frequency converter and a DO module electrically connected with the pre-contactor so that a major control circuit is formed; and an LED indicating light is connected in parallel between the control device and the pre-contactor.

Description

A kind of frequency converter pre-charge circuit control device based on PLC

Technical field

The utility model relates to a kind of frequency converter pre-charge circuit control device based on PLC, is used for rectification unit and gives dashing in advance of inverter supply process, belongs to the technical field of electric equipment control device.

Background technology

Frequency converter is a kind of by changing the machine operation supply frequency, provides its required supply voltage according to the actual demand of motor, and then the control appliance of control alternating current machine, and along with the development of industrial automation, frequency converter has also obtained using very widely.Because when frequency converter moves in each startup, need set up DC bus-bar voltage, whole system is when initial power-up, need to suppress the impact of big input current, because in the process that rectification unit charges to frequency converter by dc bus, be actually by a big electric capacity, the moment of charging can be caused short circuit, damages rectification unit.So,, before charging to frequency converter, need to increase a pre-charge circuit electric current limited, the impulse current when reducing the frequency converter startup by charging resistor at rectification unit.General pre-charge circuit comprises circuits for triggering, relay and preliminary filling resistance, like this when rectification unit starts, give frequency converter a little electric current that slowly rises by preliminary filling resistance earlier, after charging is finished, thus charging process after relay control trigger closes is finished the preliminary filling resistive short.But relay is difficult to be applied to more powerful environment for use, therefore has certain limitation.

The utility model content

The purpose of this utility model provides a kind of frequency converter pre-charge circuit control device based on PLC.

In order to achieve the above object, the technical solution of the utility model has provided a kind of frequency converter pre-charge circuit control device based on PLC, comprise pre-contactor, preliminary filling resistance, frequency converter, control device, the normally-closed contact of described pre-contactor, normally opened contact are connected with the input interface of frequency converter respectively, between the normally opened contact of contactor and pre-frequency converter, be provided with the input power supply that preliminary filling resistance constitutes frequency converter, the input of the output access controller of described frequency converter, and the output tieback of via controller is to another incoming end of pre-contactor; It is characterized in that: described control device is made up of PLC module and DO module, and described PLC module is electrically connected with the output of frequency converter, and described DO module is electrically connected with pre-contactor, thereby constitutes main control loop; And in the middle of control device and pre-contactor and connect LED light.

The PLC module is selected Siemens PLC C S7-300 for use, and the DO module selects for use Siemens digital signal output module SM322, pre-contactor to select the AHN211Y2220VAC of Panasonic for use, and frequency converter is then selected the ACS800 of ABB for use.

Because traditional relay control mode adopts hardwire to realize, because poor contact of contacts breaks down easily.And adopt the PLC module as basic control-layer, with PLC module, DO module and pre-contactor as interlock/interlocked control layer and optimal control layer, thereby reach the purpose of automatic control.After having used the PLC module, can reduce a large amount of auxiliary relays and the time relay, only the remaining a small amount of hardware relevant with input and output not only reduced the failure rate that causes because of poor contact of contacts, but also dwindled the volume of control device.

In addition, want much less as the distribution of basic control-layer than relay control system with the PLC module, can save a large amount of wiring materials and the required human cost of distribution is installed, reduce manufacturing cost greatly.And the PLC module is as Programmable Logic Controller, no matter be on-the-spot installation, debugging, still failure in service is got rid of, only need update routine just can solve, maintenance cost is extremely low, and the PLC module also can realize very complicated control function, and these all are that traditional relay control mode is not available.

Description of drawings

Below in conjunction with drawings and Examples the present utility model is further specified.

Fig. 1 is the structure chart of precharge control device of the present utility model;

Among the figure: the pre-contactor 2-of 1-preliminary filling resistance 3-frequency converter 4-PLC module 5-DO module 6-LED indicator light 7-control device.

Embodiment

Below we come this frequency converter pre-charge circuit control device based on PLC is further described in detail with concrete example by reference to the accompanying drawings, in the hope of set forth its structure and occupation mode more clearly.

This frequency converter pre-charge circuit control device based on PLC, comprise pre-contactor 1, preliminary filling resistance 2, frequency converter 3, control device 7, the normally-closed contact of described pre-contactor 1, normally opened contact are connected with the input interface of frequency converter 3 respectively, between the normally opened contact of contactor 1 and pre-frequency converter 1, be provided with the input power supply that preliminary filling resistance 2 constitutes frequency converters, the input of the output access controller 7 of described frequency converter 3, and the output tieback of via controller is to another incoming end of pre-contactor; It is characterized in that: described control device 7 is made up of PLC module 4 and DO module 5, and described PLC module 4 is electrically connected with the output of frequency converter 3, and described DO module 5 is electrically connected with pre-contactor 1, thereby constitutes main control loop; And in the middle of control device 7 and pre-contactor 1 and connect LED light 6.

Pre-contactor 1 is subjected to 5 controls of DO module, pre-contactor 1 upwards adhesive when DO module 5 is sent " closure " signal, contactor 1 downward adhesive when DO module 5 is sent " disconnection " signal.

When rectification unit just started, DO module 5 was sent " disconnection " signal, pre-contactor 1 downward adhesive, and rectification unit gives frequency converter 3 power supplies by preliminary filling resistance 2.At this moment the voltage sensor of frequency converter 3 inside receives a voltage value of feedback that slowly rises, and is real-time transmitted to PLC module 4 by the DP communication network.The program that PLC module 4 inside have one section logic to judge, the program general contents is: when the voltage value of feedback arrives 450VDC greater than 400, make DO module 5 send " closure " signal; When the voltage value of feedback arrives 450VDC less than 400, make DO module 5 send " disconnection " signal.When the voltage value of feedback greater than 400 when the 450VDC, DO module 5 is sent " closure ", makes the contactor adhesive that makes progress, and makes LED light 6 bright, the expression rectification unit can normally close a floodgate.After closing a floodgate this moment, rectification unit just can be by 3 power supplies of dc bus bio-occlusion frequency converter.

Described control device 7 is with pre-contactor 1 centre and be equipped with LED light 6.

Particularly, in the present embodiment, the PLC module is selected Siemens PLC C S7-300 for use, and the DO module selects for use Siemens digital signal output module SM322, contactor to select the AHN211Y2220VAC of Panasonic for use, and frequency converter is then selected the ACS800 of ABB for use.

Pre-contactor has two circuits up and down 1 interior the branch, and last circuit is that rectification unit directly gives frequency converter 3 power supplies, and following circuit is that rectification unit passes through preliminary filling resistance 2 to frequency converter 3 power supplies.DO module 5 can control contactor 1 closing direction, when DO module 5 is sent " closure " signal, pre-contactor 1 upwards adhesive; When DO module 5 is sent " disconnection " signal, contactor 1 downward adhesive.DO module 5 can also be controlled the on off state of LED light 6 simultaneously, and when DO module 5 was sent " closure ", LED light 6 was opened and lighted; When DO module 5 was sent " disconnection " signal, LED light 6 was closed and is extinguished.Connect by the DP connection between frequency converter 3 and the PLC module 4, PLC module 4 can receive the voltage value of feedback of frequency converter 3 in real time.

The course of work of the present utility model is: when rectification unit just started, DO module 5 was " disconnection " state, and pre-contactor 1 is at downward attracting state, and LED light is dark.This moment, rectification unit gave frequency converter 3 power supplies by preliminary filling resistance 2.Because voltage passed through preliminary filling resistance, the electric current by frequency converter 3 is limited within the small range, and the voltage that the voltage sensor senses of frequency converter 3 inside arrives is also in slow rising, and is sent in real time on the PLC module 4.When frequency converter 3 inner detected voltages surpass 400 after 450VDC, through the program of PLC module 4 inside, PLC module 4 sends the order of " closure " for DO module 5.After DO module 5 " closure ", contactor 1 upwards adhesive, LED light is bright.Normally close a floodgate to this moment rectification unit, make rectification unit directly give frequency converter 3 power supplies.

Claims (2)

1. frequency converter pre-charge circuit control device based on PLC, comprise pre-contactor (1), preliminary filling resistance (2), frequency converter (3), control device (7), the normally-closed contact of described pre-contactor (1), normally opened contact are connected with the input interface of frequency converter (3) respectively, between the normally opened contact of contactor (1) and pre-frequency converter (1), be provided with the input power supply that preliminary filling resistance (2) constitutes frequency converter, the input of the output access controller (7) of described frequency converter (3), and the output tieback of via controller is to another incoming end of pre-contactor; It is characterized in that: described control device (7) is made up of PLC module (4) and DO module (5), described PLC module (4) is electrically connected with the output of frequency converter (3), described DO module (5) is electrically connected with pre-contactor (1), thereby constitutes main control loop; And in the middle of control device (7) and pre-contactor (1) and connect LED light (6).
2. a kind of frequency converter pre-charge circuit control device based on PLC as claimed in claim 1, it is characterized in that: the PLC module is selected Siemens PLC C S7-300 for use, the DO module selects for use Siemens digital signal output module SM322, pre-contactor to select the AHN211Y2220VAC of Panasonic for use, and frequency converter is then selected the ACS800 of ABB for use.
CN 201320202477 2013-04-18 2013-04-18 PLC-based control device for frequency-converter precharge circuit CN203180767U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320202477 CN203180767U (en) 2013-04-18 2013-04-18 PLC-based control device for frequency-converter precharge circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320202477 CN203180767U (en) 2013-04-18 2013-04-18 PLC-based control device for frequency-converter precharge circuit

Publications (1)

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CN203180767U true CN203180767U (en) 2013-09-04

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CN 201320202477 CN203180767U (en) 2013-04-18 2013-04-18 PLC-based control device for frequency-converter precharge circuit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104659837A (en) * 2013-11-18 2015-05-27 天津施德科技有限公司 Frequency converter activation experimental instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104659837A (en) * 2013-11-18 2015-05-27 天津施德科技有限公司 Frequency converter activation experimental instrument

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GR01 Patent grant
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: 20130904

Termination date: 20190418