CN2701166Y

CN2701166Y - Multi-motor centralized variable-frequency soft starting intelligent controller

Info

Publication number: CN2701166Y
Application number: CN 200420016185
Authority: CN
Inventors: 尚广来
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-11
Filing date: 2004-05-11
Publication date: 2005-05-18
Anticipated expiration: 2014-05-11

Abstract

The utility model is a multi-motor centralized variable-frequency soft starting intelligent controller, comprising a casing and a control circuit in the interior of the casing. The control circuit includes a programmable logic controller PLC, a frequency converter, two contactors of the KM<J1> and the KM<J2>which are corresponded to the j-th motor, the j-th controller KM<ji> which is included the contactors of the KM<J1> and the KM<J2> and is provided between the output end of the programmable logic controller PLC and the control line end of the frequency converter. One ends of the contact points of the two contactors of the KM<J1> and the KM<J2> are mutually connected, and are led to the outside of the casing. The other ends of the contact points of the two contactors of the KM<J1> and the KM<J2> are respectively connected with the output end of the frequency converter and the power supply source. A signal input end composed of the programmable logic controller PLC is led to the outside of the casing. The utility model has the advantages of novel design concept, advanced technique, low investment expenses and the daily maintenance expenses, realizes that one frequency converter can finish the frequency-conversion soft start of a plurality of motors, and opens a now road for the popularization of the converter technique in the motor control field.

Description

Many motors are concentrated the variable frequency soft start intelligence controlling device

Technical field

The utility model relates to the motor frequency conversion start-control device, is specially a kind of many motors and concentrates the variable frequency soft start intelligence controlling device.

Background technology

In electric machines control technology, motor variable-frequency speed-regulating and variable frequency soft start technology are energy-conservation and prevent the major measure that equipment operation damages, widely popularize at present, but because the frequency converter price is very expensive, special again high to the requirement of running environment, so played very big inhibition to promoting the use of this technology, especially at coal mine work area, motor uses very concentrated, the operational environment very severe, as all mix complicated huge frequency-converter device for every motor, almost be impossible from considering economically.

Summary of the invention

The utility model costs an arm and a leg at frequency converter, use the occasion of concentrating all to be equipped with the problem of a frequency converter for every motor at motor, provide a kind of many motors to concentrate the variable frequency soft start intelligence controlling device, and be purpose only with the hardware configuration that this control device is provided.

The utility model is to adopt following technical scheme to realize: many motors are concentrated the variable frequency soft start intelligence controlling device, the control circuit that comprises housing and enclosure interior, control circuit comprise programmable logic controller PLC, frequency converter, two contactor KMs corresponding with j platform motor _J1And KM _J2, be connected between the control line end of the output of programmable logic controller (PLC) PLC and frequency converter and contain contactor KM _J1And KM _J2The j platform controller KM of coil _Ji, two contactor KM _J1And KM _J2An end of contact interconnect and cause outside the housing, two contactor KM _J1And KM _J2The other end of contact be connected with power supply with the output of frequency converter respectively, programmable logic controller PLC signal input part in groups causes outside the housing.During use, two contactor KM _J1And KM _J2The contact lead-out wire link to each other with the power supply line end of motor, every group of signal input part of programmable logic controller PLC links to each other with the starting button of each motor, the two ends and the central point of stop button series arm; Its course of work is as follows: when pressing the starting button of j platform motor, programmable logic controller (PLC) PLC gives the j platform controller KM of its output according to the request address of this motor _JiSend instruction it is started working, controller KM _JiAt first make contactor KM _J1The closing of contact, and send control signal to frequency converter, frequency converter is started working, this moment, this motor just started with the out-put supply after the frequency converter frequency conversion; Behind electric motor starting (output frequency of frequency converter reaches power frequency), controller KM _JiMake contactor KM _J2The closing of contact, contactor KM _J1The contact open, realizing that power supply switches to common frequency power network behind the electric motor starting remains in operation, this moment controller KM _JiSend halt instruction to frequency converter, frequency converter is quit work, so far just finished the Soft Start-up Process of this motor; In the starting process of this motor, Programmable Logic Controller PLC refuses the start request of other motor, and send the signal of waiting for starting to the operator, after this electric motor starting is finished, Programmable Logic Controller PLC handles follow-up start request, repeat the above-mentioned course of work, thereby reach the purpose of control multiple electric motors soft start.When the stop button of this motor was pressed, Programmable Logic Controller PLC was according to its address, to controller KM _JiSend control command, make contactor KM _J2The contact disconnect, this motor shuts down.

From the above-mentioned course of work as can be seen, controller KM _JiFunction be control contactor KM _J1And KM _J2The contact in good time switching and frequency converter work, stop; Under the triggering of the output end signal of Programmable Logic Controller PLC, by controller KM _JiInterior contactor KM _J1And KM _J2The control of charged and dead electricity of coil, can easily realize the in good time switching of its contact; While controller KM _JiProvide conducting and cut-off signal by control line end in good time, can realize the work of frequency converter and stop to frequency converter.To the electricity field those of ordinary skill of electric control field particularly, finish the controller KM of above-mentioned functions _JiCircuit structure be to realize very easily, and multiple different circuit structure can be arranged.The utility model provides controller KM in embodiment _JiA kind of particular circuit configurations.

The utlity model has advantages such as mentality of designing novelty, advanced technology, investment and regular maintenance expense are low, can realize finishing the multiple electric motors variable frequency soft start, for converter technique has been opened up a new road wideling popularize of Motor Control Field with a frequency converter.

Description of drawings

Fig. 1 is an external structure schematic diagram of the present utility model;

Fig. 2 is the circuit theory schematic diagram of the utility model control circuit;

Fig. 3 is controller KM _JiA kind of physical circuit schematic diagram;

Embodiment

Many motors are concentrated the variable frequency soft start intelligence controlling device, comprise the control circuit of housing 2 and enclosure interior, and control circuit comprises programmable logic controller PLC, frequency converter B PQ, two contactor KMs corresponding with j platform motor _J1And KM _J2, be connected between the control line end of the output of programmable logic controller (PLC) PLC and frequency converter and contain contactor KM _J1And KM _J2The j platform controller KM of coil _Ji, two contactor KM _J1And KM _J2An end 3 of contact interconnect and cause outside the housing, two contactor KM _J1And KM _J2The other end of contact be connected with power supply with the output of frequency converter respectively, programmable logic controller PLC signal input part 4 in groups causes outside the housing.

Control circuit also comprises DC power supply circuit DC-POWER, is frequency converter, controller KM _Ji, programmable logic controller (PLC) PLC provides working power; Frequency converter B PQ and programmable logic controller (PLC) PLC are known existing product, can select multiple different model for use.

During use, two contactor KM _J1And KM _J2Contact lead-out wire 3 link to each other with the power supply line end of motor, every group of signal input part 4 of programmable logic controller PLC links to each other with the two ends and the central point of the starting button of each motor, stop button series arm; Power frequency supply is introduced in the controller from lead-out wire 1.

Controller KM _JiInternal circuit comprise with the output of programmable logic controller (PLC) PLC link to each other, respectively by the trigger end of solid-state relay SSR3 and trigger end, the contactor KM of solid-state relay SSR1 _J2The control loop that constitutes of normally closed auxiliary contact serial connection, by relay K ₂Normally closed auxiliary contact, contactor KM _J1Coil, solid-state relay SSR1 the normally opened contact serial connection control loop, by the control loop of the coil tandem of the normally opened contact of solid-state relay SSR3, relay K 1, by the normally-closed contact of relay K 1, the contactor KM that is in parallel _J2Coil and the control loop of often opening time-delay closed contact serial connection of the coil of time relay T1, time relay T, link to each other with the FEEDBACK CONTROL end of frequency converter, by the control loop of the normally-closed contact serial connection of the trigger end of solid-state relay SSR2 and relay K 1, the loop that relay K 2 and time relay T parallel connection are connected with the output of SSR2 and formed, link to each other with the control end of frequency converter respectively by contactor KM _J1often open auxiliary contact, contactor KM _J2Normally closed auxiliary contact and contactor KM _J2The normally closed time-delay of often opening auxiliary contact, time relay T1 open the control loop that contact serial connection forms.After the model of programmable logic controller (PLC) PLC and frequency converter was selected, the concrete line end of the output control terminal of PLC and the control end of frequency converter, FEEDBACK CONTROL end was known, therefore, and controller KM _JiIt is obvious being connected with concrete line end between PLC and frequency converter.

After solid-state relay SSR1 obtains triggering signal from PLC (promptly pressing the electric motor starting button), make contactor KM _J1Coil charged, its contact adhesive is connected j platform motor and inverter output terminal uvw, simultaneously contactor KM _J1often open the auxiliary contact closure, connect the start loop of frequency converter, frequency converter is started working, at this moment, motor is with the output frequency power supply entry into service of frequency converter; When the output frequency of frequency converter reached power frequency, frequency converter provided a voltage signal, triggered fixed relay SSR2, made the coil of the coil of time relay T and relay K 2 charged, and the normally-closed contact of relay K 2 disconnects, contactor KM _J1Coil losing electricity, its contact disconnects, time relay T's often opens the adhesive subsequently of time-delay closed contact, contactor KM simultaneously _J2The contact adhesive, make motor switch to power frequency supply abc and remain in operation contactor KM _J2often open the auxiliary contact closure, connect the stop loop of frequency converter, the output of motor and frequency converter cut off and make frequency converter quit work (the normally-closed contact time-delay disconnection of time relay T1).After solid-state relay SSR3 obtains triggering signal from PLC (promptly pressing the motor stop button), the coil of relay K 1 is charged, and two normally-closed contact cuts off contactor KM simultaneously _J2The loop of coil and solid-state relay SSR2, contactor KM _J2Coil losing electricity, its contact disconnects, and motor and power supply abc are disconnected, and reaches the purpose of shutdown.

Claims

1, a kind of many motors are concentrated the variable frequency soft start intelligence controlling device, comprise the control circuit of housing (2) and enclosure interior, it is characterized by: control circuit comprises programmable logic controller PLC, frequency converter B PQ, two contactor KMs corresponding with j platform motor _J1And KM _J2, be connected between the control line end of the output of programmable logic controller (PLC) PLC and frequency converter and contain contactor KM _J1And KM _J2The j platform controller KM of coil _Ji, two contactor KM _J1And KM _J2The end (3) of contact interconnect and cause outside the housing, two contactor KM _J1And KM _J2The other end of contact be connected with power supply with the output of frequency converter respectively, programmable logic controller PLC signal input part (4) in groups causes outside the housing.

2, many motors as claimed in claim 1 are concentrated the variable frequency soft start intelligence controlling device, it is characterized by: controller KM _JiInternal circuit comprise with the output of programmable logic controller (PLC) PLC link to each other, respectively by the trigger end of solid-state relay SSR3 and trigger end, the contactor KM of solid-state relay SSR1 _J2The control loop that constitutes of normally closed auxiliary contact serial connection, by relay K ₂Normally closed auxiliary contact, contactor KM _J1Coil, solid-state relay SSR1 the normally opened contact serial connection control loop, by the control loop of the coil tandem of the normally opened contact of solid-state relay SSR3, relay K 1, by the normally-closed contact of relay K 1, the contactor KM that is in parallel _J2Coil and the control loop of often opening time-delay closed contact serial connection of the coil of time relay T1, time relay T, link to each other with the FEEDBACK CONTROL end of frequency converter, by the control loop of the normally-closed contact serial connection of the trigger end of solid-state relay SSR2 and relay K 1, the loop that relay K 2 and time relay T parallel connection are connected with the output of SSR2 and formed, link to each other with the control end of frequency converter respectively by contactor KM _J1often open auxiliary contact, contactor KM _J2Normally closed auxiliary contact and contactor KM _J2The normally closed time-delay of often opening auxiliary contact, time relay T1 open the control loop that contact serial connection forms.