CN209313422U - A kind of variable-frequency motor cooling control system - Google Patents
A kind of variable-frequency motor cooling control system Download PDFInfo
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- CN209313422U CN209313422U CN201920364623.5U CN201920364623U CN209313422U CN 209313422 U CN209313422 U CN 209313422U CN 201920364623 U CN201920364623 U CN 201920364623U CN 209313422 U CN209313422 U CN 209313422U
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Abstract
The utility model discloses a kind of variable-frequency motor cooling control system, variable-frequency motor circuit and cooling blower circuit and secondary circuit including the parallel connection of three-phase four-wire power downstream；Variable-frequency motor circuit includes the external frequency converter start-up circuit of frequency converter VVVF, and the frequency converter start-up circuit includes the auxiliary normal open switch of the auxiliary normal open switch and electric current inductive switch KI1 of concatenated A.C. contactor KM1；The cooling blower circuit includes primary concatenated second circuit breaker Q F12, the main normal open switch of the A.C. contactor KM1, electrothermal relay KH1 coil, electric current inductive switch KI1 coil and cooling blower；Secondary circuit includes cooling blower control circuit；Cooling blower control circuit includes the second downstream circuit breaker Q F12 branch line, the normally closed switch of electrothermal relay KH1 and the coil of A.C. contactor KM1 and connects N line.The utility model provides automatic monitoring, automatic protection, the functions such as automatic instruction.
Description
Technical field
The utility model relates to variable-frequency motor field more particularly to a kind of variable-frequency motor cooling control systems.
Background technique
Currently, existing variable-frequency motor cooling control system can be completed to variable-frequency motor overheating protection.Pass through variable-frequency motor
Cooling system, operation of the cooling control system independently of variable-frequency motor are opened after starting.
This control method is able to satisfy the cooling demand for control of general variable-frequency motor, but there is also some shortcomingss:
Interlock is insufficient: automatically controlled due to using autonomous control system, or with confession for the overheating protection of variable-frequency motor
Element processed is interlocked.Since cooling blower fault-free itself is fed back, if cooling blower itself breaks down, stop becoming not in time
Frequency motor operation may cause variable-frequency motor injury after long-play.
Utility model content
The purpose of the utility model is to provide a kind of variable-frequency motor cooling control system, realizes and monitor automatically, automatic protection,
The functions such as automatic instruction.
To achieve the above object, the utility model provides a kind of variable-frequency motor cooling control system, comprising:
Primary circuit, the primary circuit include the frequency conversion of three-phase four-wire power and the parallel connection of three-phase four-wire power downstream
Motor circuit and cooling blower circuit；
The variable-frequency motor circuit includes the first circuit breaker Q F11 and frequency converter VVVF being sequentially connected in series, wherein the change
The output end of frequency device VVVF accesses variable-frequency motor, the external frequency converter start-up circuit of frequency converter VVVF, the frequency converter start-up circuit
The auxiliary normal open switch of auxiliary normal open switch and electric current inductive switch KI1 including concatenated A.C. contactor KM1；
The cooling blower circuit includes primary concatenated second circuit breaker Q F12, the A.C. contactor KM1
Main normal open switch, electrothermal relay KH1 coil, electric current inductive switch KI1 coil and cooling blower；
Secondary circuit, the secondary circuit include cooling blower control circuit；
The cooling blower control circuit includes the normally closed switch of the second downstream circuit breaker Q F12 branch line, electrothermal relay KH1
And A.C. contactor KM1 coil and connect N line.
The utility model provides variable-frequency motor circuit, cooling blower circuit and the secondary circuit for control in parallel,
Frequency conversion is realized by the start-up circuit of A.C. contactor, electric current inductive switch KI1, electrothermal relay KH1 and frequency converter VVVF
The interconnection of motor circuit and cooling blower circuit in the case where at least ensure that cooling blower fault, cuts off variable-frequency motor
Circuit, so that variable-frequency motor circuit, which will not continue to running, leads to overheating fault in cooling blower failure.Specifically, work as cooling
In blower when the second circuit breaker Q F12 failure, the supply lines no current of cooling blower control circuit, the coil of A.C. contactor KM1
It powers off, the switch of the A.C. contactor KM1 in the starting route of frequency converter will not be closed, therefore frequency converter not will start variable-frequency electric
Machine.When the switch fault of A.C. contactor KM1, electric current inductive switch KI1 coil must not be electric, therefore in frequency converter start-up circuit
The normal open switch of electric current inductive switch KI1 disconnect, therefore frequency converter not will start variable-frequency motor.When electrothermal relay KH1 failure
When, it usually overheats, then the normally closed switch of the electrothermal relay KH1 in cooling blower control circuit disconnects, A.C. contactor KM1 line
Must not enclose electricity, therefore the switch of the A.C. contactor KM1 in frequency converter start-up circuit is not closed, therefore frequency conversion starter will not open
Dynamic variable-frequency motor.When electric current inductive switch KI1 failure, the switch of electric current inductive switch KI1 is not closed, therefore frequency converter opens
Dynamic circuit will not be closed, therefore not will start variable-frequency motor.By above-mentioned setting, so that control and the variable-frequency motor of cooling blower
Control interconnection.When solving cooling blower failure, variable-frequency motor continues the problem of starting is to overheating fault.
In one embodiment, the secondary circuit further includes electrifying control circuit,
The electrifying control circuit includes power supply L3 line and fuse FU1, and fuse FU1 downstream connection has switch and centre
Then the coil of relay connects N line,
The normal open switch of the intermediate relay is in series in the cooling blower control circuit,
The auxiliary normal open switch of the intermediate relay is in series in the start-up circuit of the frequency converter VVVF.
Electrifying control circuit for being powered on for circuit, wherein electrifying control circuit, frequency converter VVVF start-up circuit and
In cooling blower control circuit be arranged intermediate relay can be realized reversed interconnection, when the failure of frequency converter can also disconnect it is cold
But the starting of blower.
Preferably, the secondary circuit further includes frequency converter failure and indicating circuit,
The frequency converter failure and indicating circuit includes power supply L3 line and fuse FU1, the downstream fuse FU1 frequency converter
The failure input port of VVVF is simultaneously picked out from failure output terminal mouth, connects N after connecting the 4th intermediate relay KA4 coil after picking out
Line,
The electrifying control circuit is in series with the normally closed switch of the 4th intermediate relay KA4.
When frequency converter failure, the 4th intermediate relay KA4 coil obtain it is electric, obtain it is electric after electrifying control circuit the 4th among
Relay KA4 normally closed switch disconnects, then intermediate relay coil blackout, causes cooling blower not run.
In another embodiment, frequency conversion failure and indicating circuit also include the event in parallel with the 4th intermediate relay KA4
Hinder indicator light HL3.
In another embodiment, after the secondary circuit further includes control selections circuit, including power supply line accesses fuse
Access selection switch SA, after selecting an output terminal of switch SA to concatenate external terminal and the first intermediate relay KA1 coil
N line is accessed, another terminal of switch SA is selected to access cut-off push button SB2, cut-off push button SB2 output end access starting in parallel is pressed
The normal open switch of the normal open switch of button SB1 and the second intermediate relay KA2, start button SB1 and the second intermediate relay KA2 are defeated
N line is accessed after accessing the coil of the second intermediate relay KA2 behind outlet interflow；
Cooling blower control circuit access accesses the normal open switch and the of the first intermediate relay KA1 in parallel in circuit
The normal open switch of two intermediate relay KA2；
The auxiliary normal open switch and second of the first intermediate relay KA1 in parallel is accessed in the start-up circuit of frequency converter VVVF
The auxiliary normal open switch of intermediate relay KA2.
Control selections circuit is another form on upper electric control line road, has accessed two kinds of control models, i.e., long-range control
It controls on the spot.Wherein the circuit of external terminal and the first intermediate relay KA1 coil is long-range control, and external terminal is for remote
Journey order transmission, and starting with the circuit of cut-off push button is to control on the spot, those skilled in the art should know that start button is
Normal open switch and cut-off push button are normally closed switch.
Preferably, the secondary circuit further includes frequency converter failure and indicating circuit,
The frequency converter failure and indicating circuit includes power supply L3 line and fuse FU1, the downstream fuse FU1 frequency converter
The failure input port of VVVF is simultaneously picked out from failure output terminal mouth, connects N after connecting the 4th intermediate relay KA4 coil after picking out
Line,
In the control selections circuit, in the selection upstream switch SA or the first intermediate relay KA1 coil and centre
The downstream tandem at the interflow relay coil KA2 has the normally closed switch of the 4th intermediate relay KA4.
When frequency converter failure, the 4th intermediate relay KA4 coil obtain it is electric, obtain it is electric after electrifying control circuit the 4th among
Relay KA4 normally closed switch disconnects, then at least one coil blackout of the first intermediate relay KA1 or KA2, leads to cooling blower
It will not run.
In another embodiment, frequency conversion failure and indicating circuit also include the event in parallel with the 4th intermediate relay KA4
Hinder indicator light HL3.
The frequency converter of the application can be but be not limited to ACS510, in the case where ACS510, the input port of frequency conversion failure
It is port 19, the output interface of frequency conversion failure is port 21.
Meanwhile in the case where ACS510, the start-up circuit of frequency converter VVVF includes port 10 (24V), port 13, end
Mouth 15, port 18.More specifically in the auxiliary normal open switch and electric current inductive switch of 10 downstream of port access A.C. contactor KM1
The auxiliary normal open switch of KI1, port 15 and 18 connector of port access the auxiliary normal open switch of the first intermediate relay KA1, connect
Mouth 13 accesses the auxiliary normal open switch of the second intermediate relay KA2, the auxiliary normal open switch and second of the first intermediate relay KA1
It is connect behind the auxiliary normal open switch interflow of intermediate relay KA2 with port 10.
And port 11 and port 12 are inscribed.
It should be understood that above-mentioned connection type can change as needed, such as may when being not provided with two kinds of external control
The connection for omitting the first intermediate relay KA1 or the second intermediate relay KA2, when the variation of the model of frequency converter VVVF, port
It may change, but the application includes various modifications.
Preferably, the secondary circuit further includes failure alarm circuit, and the failure alarm circuit includes power supply L3 line
With fuse FU1, fuse FU1 leading-out terminal is connected with the normal open switch end of incoming cables of the 4th intermediate relay KA4, among the 4th after
The normal open switch output end of electric appliance KA4 is connected with the one end alarm lamp HL5.
Preferably, the secondary circuit further includes power supply instruction circuit, and the power supply instruction circuit includes power supply L3
Line and fuse FU1 connect power supply indicator HL1 between fuse FU1 leading-out terminal and neutral conductor N.
Power supply indicator HL1 is for determining on/off.
Preferably, the model ACS510 of the frequency converter VVVF.
Preferably, the secondary circuit further includes cooling fan control circuit, and the cooling fan control circuit includes
Power supply L3 line and fusing FU1, fuse FU1 leading-out terminal respectively with the KA1 of intermediate relay, the second intermediate relay KA2 it is normal
The input terminal of switch is connected, the first intermediate relay KA1, the second intermediate relay KA2 normal open switch output end interflow after
It is connected with cooling fan M input terminal.
The utility model provides automatic monitoring, automatic protection, the functions such as automatic instruction.
The utility model has an advantage that
(a) achievable that variable-frequency motor major loop overcurrent, short circuit etc. are protected, to variable-frequency motor cooling protection function.
(b) it can judge whether cooling blower runs, by controlling back by the control circuit current detecting to cooling blower
The electrothermal relay of road detects whether cooling blower overloads, and comprehensive coverage cooling blower works normally, once in improper
Working condition stops variable-frequency motor immediately, guarantees that equipment is in best standby mode.
(c) restart variable-frequency electric due to first starting cooling system after cooling system works normally before starting variable-frequency motor
Machine improves safety and reliability, while simplifying control cabinet component and wiring, saves cost.
Detailed description of the invention
Fig. 1 is the schematic diagram of primary circuit in the utility model；
Fig. 2 is the schematic diagram of secondary circuit in the utility model.
QF11 the first circuit breaker Q the second breaker of F12
KM1 A.C. contactor KH1 electrothermal relay KI1 galvanic contact switch
KA1 the first intermediate relay KA2 the second intermediate relay KA3 third intermediate relay
The 4th intermediate relay of KA4
SA selects switch FU1 fuse
HL1 power supply indicator HL2 run indicator HL3 malfunction indicator lamp HL5 alarm lamp
M2 cooling blower M cooling fan
Specific embodiment
The preferred embodiment of the utility model is described in detail below with reference to attached drawing, to be clearer to understand this reality
With novel objects, features and advantages.It should be understood that embodiment shown in the drawings is not the limit to the scope of the utility model
System, and simply to illustrate that the connotation of technical solutions of the utility model.
A kind of variable-frequency motor cooling system as shown in Figure 1, 2, including primary circuit and secondary circuit.
Primary circuit includes three-phase four-wire power, the first circuit breaker Q F11, the second circuit breaker Q F12, frequency converter VVVF, becomes
Frequency motor, A.C. contactor KM1, electrothermal relay KH1, electric current inductive switch KI1, cooling blower.Three-phase four-wire power is 380V/
The power supply of 50Hz, and there is L1 phase, L2 phase, L3 phase and neutral conductor N.The model ACS510 of frequency converter VVVF.
Two variable-frequency motor routes and cooling blower route in parallel are formed by said elements.
Specifically, in variable-frequency motor route, three-phase four-wire power L1, L2, L3 access the suitable for reading of the first circuit breaker Q F11,
The lower mouth of QF11 accesses frequency converter VVVF power end U1, V1, W1, and output U2, V2, W2 of frequency converter VVVF connects motor.The change
The starting public terminal 10 of frequency device VVVF is connected with auxiliary contact one end of A.C. contactor KM1, and A.C. contactor KM1's is auxiliary
The contact other end is helped to be connected with mono- contact electric current inductive switch KI1, the other end of the contact electric current inductive switch KI1 is respectively with
One intermediate relay KA1, the second intermediate relay KA2 auxiliary contact be connected, the first intermediate relay KA1 auxiliary contact are another
End point is connected with frequency converter VVVF terminal 15,18 respectively, another endpoint of the second intermediate relay KA2 auxiliary contact and frequency conversion
Device VVVF terminal 13 is connected, and starts frequency converter.The external cabling of frequency converter VVVF includes that from joining, frequency converter is opened for port 11,12
Moving-wire road utilizes port 10,13,15,18.Port 10 provides 24V power supply, and the auxiliary of series AC contactor KM1 is normal behind port 10
It is connect after the auxiliary normal open switch of switch and electric current inductive switch KI1 with port 13 and/or port 15,18.On port 13
The auxiliary normal open switch for accessing the second intermediate relay KA2 accesses the auxiliary of the first intermediate relay KA1 after 15,18 doubling
Normal open switch.First intermediate relay KA1 switch and the second intermediate relay KA2 switch are related to different state of a controls, hereinafter can
It proposes, both usual first intermediate relay KA1 and the second intermediate relay KA2 one are connected.As A.C. contactor KM1 and electricity
When influenza inductive switch KI1 coil obtains electric closure, starting route is connected, and motor incites somebody to action to obtain electric operation.
In cooling blower route, three-phase four-wire power L1, L2, L3 access the suitable for reading of the second circuit breaker Q F12, and second is disconnected
Road device QF12 leading-out terminal (descending mouth) is connected with the normally opened main switch input terminal of A.C. contactor KM1；A.C. contactor KM1's is normal
It opens main switch output end to be connected with electrothermal relay KH1 coil, electrothermal relay KH1 coil outlet connects electric current inductive switch KI1 coil
End of incoming cables, electric current inductive switch KI1 finish lead is connected with cooling blower Me.
Due to the first intermediate relay KA1, the second intermediate relay KA2, its KM1 of ac contactor switch in primary circuit
Setting, no control route auxiliary in the case where, will not directly initiate, but primary circuit realizes circuit connection.
Secondary circuit is control circuit, is related to three-phase four-wire power one phase line L3, L3 phase and the end of incoming cables fuse FU1 phase
Even.Secondary circuit includes power supply instruction, long-range control, on the spot control, frequency converter operation and instruction, fault alarm, cooling fan
Control, circuit of cooling blower control etc..
Power indicating circuit: power supply indicator HL1, power supply indicator are connected between fuse FU1 leading-out terminal and neutral conductor N
HL1 is for determining on/off.
Control selections circuit, control circuit includes long-range control and controls on the spot, in fuse FU1 leading-out terminal and selection
Switch SA input terminal is connected, and mouth under switch SA is selected to execute the connection line remotely controlled and the connecting line controlled on the spot respectively
Road, after selecting one, the route of one of them will will do it subsequent judgement.Select the output port access of switch SA
External terminal, external terminal are used for remote control signal, and external terminal connects the coil of the first intermediate relay KA1, reconnect
N line is connected after the normally closed switch of 4th intermediate relay KA4, the long-range control of route expression is selected when by selection switch SA
After receiving remote control signal after circuit for remotely controlling, in the case where the 4th intermediate relay KA4 is not turned off, route is connected
And the coil of the first intermediate relay KA1 obtains electric.The another output mouth of switch SA is selected to access the defeated of cut-off push button SB2
Enter end, accesses the second intermediate relay after then connecting the normal open switch of start button SB1 and the second intermediate relay KA2 in parallel
The coil of device KA2 connects N line after reconnecting the normally closed switch of the 4th intermediate relay KA4, and route expression is controlled on the spot, needed
The mode of manual switch is wanted to be started, cut-off push button SB2 is normally closed switch, and start button SB1 is normal open switch, when needs open
When dynamic, start button SB2 switch is pressed, due to the normally closed switch of cut-off push button SB2 and the 4th intermediate relay KA4, in second
Between relay KA2 coil obtain it is electric, obtain it is electric after the normal open switch of the second intermediate relay KA2 close, circuit communication presses in starting
Button SB1 still keeps circuit closed after resetting, and when it is required to be disconnected, presses cut-off push button SB2, cut-off push button SB2 is disconnected, in second
Between relay KA2 coil blackout, after the switch of the second intermediate relay KA2 is opened, route is disconnected.
Frequency converter operation and indicating circuit: fuse FU1 leading-out terminal is connected with the operation output terminal 22 of frequency converter, frequency conversion
The operation output terminal 24 of device is parallel with after the coil and frequency converter run indicator HL2 of third intermediate relay KA3 and neutrality
Line N is connected.In other words, the operation output terminal 24 of frequency converter is connected with the end of incoming cables third intermediate relay KA3, among third after
The output end of electric appliance KA3 coil is connected with three-phase four-wire power neutral conductor N；The operation output terminal 24 and frequency converter of frequency converter are transported
The row end of incoming cables indicator light HL2 is connected, and frequency converter run indicator HL2 output terminal is connected with three-phase four-wire power neutral conductor N.It should
Route is provided out operating status by the detection of frequency converter itself and reminds.
Frequency converter failure and indicating circuit: fuse FU1 leading-out terminal is connected with the failure output terminal of frequency converter 19, frequency conversion
Failure output terminal 24 of device is parallel with after the coil and frequency converter failure indicator light HL3 of the 4th intermediate relay KA4 and neutrality
Line N is connected.In other words, failure output terminal 21 of frequency converter is connected with the 4th intermediate relay KA4 coil end of incoming cables, in the 4th
Between relay KA4 coil output be connected with three-phase four-wire power neutral conductor N；Failure output terminal 21 and frequency converter of frequency converter
The end of incoming cables malfunction indicator lamp HL3 is connected, and frequency converter failure indicator light HL3 output terminal is connected with three-phase four-wire power neutral conductor N.
Failure alarm circuit: fuse FU1 leading-out terminal is connected with the normal open switch end of incoming cables of the 4th intermediate relay KA4,
The normal open switch output end of 4th intermediate relay KA4 is connected with alarm lamp one end；Fuse FU1 leading-out terminal and hot relay
The normally opened auxiliary contact one end device KH1 is connected, the normally opened auxiliary contact other end of electrothermal relay KH1 and the one end alarm lamp HL5 phase
Even, the alarm lamp HL5 other end is connected with three-phase four-wire power neutral conductor N.
Cooling blower control circuit: fuse FU1 leading-out terminal respectively with the KA1 of intermediate relay, the second intermediate relay
The input terminal of the normal open switch of KA2 is connected, the normal open switch output end of the first intermediate relay KA1, the second intermediate relay KA2
It is connected behind interflow with cooling fan M input terminal.That is, the first intermediate relay KA1, the second intermediate relay KA2 are normally opened
The one end that powers Switch output terminal and frequency converter cooling fan M is connected, and frequency converter cooling fan M powers the other end and three-phase and four-line
Mains neutral line N is connected.
Cooling blower control circuit: the mono- leading-out terminal W12 of circuit breaker Q F12 respectively with the first intermediate relay KA1,
Auxiliary normal open switch contact one end of two intermediate relay KA2 is connected, the first intermediate relay KA1, the second intermediate relay KA2
The auxiliary normal open switch contact other end be connected with electrothermal relay KH1 normally closed switch contact one end, another termination A.C. contactor
KM1 coil one end, the neutral conductor N of another termination power of A.C. contactor KM1 coil.
The 4th intermediate relay KA4 in the application is fed back for frequency converter failure, when frequency converter fault-free, after upper point
At least one of the first intermediate relay KA1 coil and the second intermediate relay KA2 coil can be at least made to obtain electric, so that the
At least one normal open switch closure in one intermediate relay KA1 and KA2, the coil of A.C. contactor KM1 obtain it is electric after be closed and open
It closes so that cooling blower closing of circuit, cooling blower starting.When the second circuit breaker Q F12 failure in cooling blower, cooling blower
The supply lines W12 no current of control circuit, the coil blackout of A.C. contactor KM1, the exchange in the starting route of frequency converter connect
The switch of tentaculum KM1 will not be closed, therefore frequency converter not will start variable-frequency motor.When the switch fault of A.C. contactor KM1,
Electric current inductive switch KI1 coil must not be electric, therefore the normal open switch of the electric current inductive switch KI1 in frequency converter start-up circuit is disconnected
It opens, therefore frequency converter not will start variable-frequency motor.It when electrothermal relay KH1 failure, usually overheats, then cooling blower control electricity
The normally closed switch of electrothermal relay KH1 in road disconnects, and A.C. contactor KM1 coil must not be electric, therefore in frequency converter start-up circuit
The switch of A.C. contactor KM1 be not closed, therefore frequency conversion starter not will start variable-frequency motor.As electric current inductive switch KI1
When failure, the switch of electric current inductive switch KI1 is not closed, therefore the start-up circuit of frequency converter will not be closed, therefore not will start
Variable-frequency motor.By above-mentioned setting, so that the control of cooling blower and the control of variable-frequency motor interconnect.Solves cooling blower event
When barrier, variable-frequency motor continues the problem of starting is to overheating fault.
The control of secondary circuit includes the control on the spot and long-range control of variable-frequency motor, selection switch selection remote status
When, control is started and stopped by complete variable-frequency motor according to remote signal；When selection switch selects state on the spot, by opening
Dynamic button SB1 and stop button SB2 completion variable-frequency motor starts and stops control.
The operation of the frequency converter VVVF is fed back by third intermediate relay KA3 and indicator light HL2, frequency converter
The failure of VVVF is fed back by the 4th intermediate relay KA4 and indicator light HL3.
The first intermediate relay KA1, the second intermediate relay KA2 auxiliary contact closure, start the cooling of frequency converter
Fan completes the cooling work to frequency converter VVVF, once overload, the movement of electrothermal relay KH1 normally-closed contact, A.C. contactor
KM1 coil losing electricity stops variable-frequency motor cooling blower, while stopping frequency converter VVVF, stops variable-frequency motor power supply, protects variable-frequency electric
Machine.
The step of the utility model operates is as follows:
(a) circuit breaker Q F11, QF12 of control cabinet is closed first, and control cabinet is in power-up state；
(b) on the spot/remote status that system is selected by change-over switch SA, sets variable-frequency motor Starting mode；
If (c) system is in state on the spot, variable-frequency motor can be started by the first button SB1, it can by the 2nd SB2 of button
Stop variable-frequency motor manually；
(d) if system is in remote status, it will be decided whether to start variable-frequency motor according to remotely given signal；
(e) after the first intermediate relay KA1, the second intermediate relay KA2 movement, triggering variable-frequency motor cooling blower control
Ac contactor KM1 in circuit；If corresponding circuit breaker Q F12, electrothermal relay KH1 fault-free, ac contactor KM1 coil
Electricity triggers its auxiliary contact closure, completes the power supply of cooling blower primary circuit；If corresponding circuit breaker Q F12, electrothermal relay KH1
It is faulty, ac contactor KM1 coil must not electricity, can not trigger its auxiliary contact closure, cooling blower cannot be completed and once returned
Road power supply；
If (f) cooling blower primary circuit power supply is completed, cooling blower is started to work, and installs the electric current induction on its circuit
Switch KI1 normally opened contact closure；
(g) since the first intermediate relay KA1, the second intermediate relay KA2 auxiliary contact are closed, ac contactor KM1 is auxiliary
Help contact closure, electric current inductive switch KI1 normally opened contact closure.After completing the above movement, frequency converter VVVF starts terminal closure,
Starting frequency converter and corresponding macro strategy, variable-frequency motor start to run by preassigned pattern；
If (h) short-circuit conditions occurs in variable-frequency motor, corresponding circuit breaker Q F11 tripping power-off stops variable-frequency motor.If going out
Existing under-voltage, overload situations, the output of frequency converter VVVF failure, frequency converter VVVF stop power supply, stop variable-frequency motor；
If (i) there is short-circuit conditions, corresponding circuit breaker Q F12 tripping power-off, A.C. contactor KM1 coil in cooling blower
Power loss, KM1 auxiliary contact disconnect.If overload situations out, the movement of electrothermal relay KH1 normally-closed contact, A.C. contactor KM1 deactivation coil
Electricity, KM1 auxiliary contact disconnect.If cooling blower electrical contact is bad or bad, cooling blower primary circuit no current passes through, electricity
Influenza inductive switch KI1 will be failure to actuate；
If (k) A.C. contactor KM1 auxiliary contact disconnect or electric current inductive switch KI1 is not closed, frequency converter VVVF's is opened
Dynamic signaling point will be switched off, stop frequency converter for electricity output, and then protect variable-frequency motor.
The preferred embodiment of the utility model has already been described in detail above, it is understood that having read the utility model
Above-mentioned teaching content after, those skilled in the art can make various changes or modifications the utility model.These shapes of equal value
Formula is also fallen within the scope of the appended claims of the present application.
Claims (9)
1. a kind of variable-frequency motor cooling control system characterized by comprising
Primary circuit, the primary circuit include the variable-frequency motor of three-phase four-wire power and the parallel connection of three-phase four-wire power downstream
Circuit and cooling blower circuit；
The variable-frequency motor circuit includes the first circuit breaker Q F11 and frequency converter VVVF being sequentially connected in series, wherein the frequency converter
The output end of VVVF accesses variable-frequency motor, the external frequency converter start-up circuit of frequency converter VVVF, and the frequency converter start-up circuit includes
The auxiliary normal open switch of the auxiliary normal open switch and electric current inductive switch KI1 of concatenated A.C. contactor KM1；
The cooling blower circuit includes once that concatenated second circuit breaker Q F12, the master of the A.C. contactor KM1 are normal
Switch, electrothermal relay KH1 coil, electric current inductive switch KI1 coil and cooling blower；
Secondary circuit, the secondary circuit include cooling blower control circuit；
The cooling blower control circuit include the second downstream circuit breaker Q F12 branch line, electrothermal relay KH1 normally closed switch and
The coil of A.C. contactor KM1 simultaneously connects N line.
2. variable-frequency motor cooling control system according to claim 1, which is characterized in that on the secondary circuit further includes
Electric control circuit,
The electrifying control circuit includes power supply L3 line and fuse FU1, and fuse FU1 downstream connection has switch and intermediate relay
Then the coil of device connects N line,
The normal open switch of the intermediate relay is in series in the cooling blower control circuit,
The auxiliary normal open switch of the intermediate relay is in series in the start-up circuit of the frequency converter VVVF.
3. variable-frequency motor cooling control system according to claim 2, which is characterized in that the secondary circuit further includes
Frequency converter failure and indicating circuit,
The frequency converter failure and indicating circuit includes power supply L3 line and fuse FU1, the downstream fuse FU1 frequency converter VVVF
Failure input port and picked out from failure output terminal mouth, after picking out connect the 4th intermediate relay KA4 coil after connect N line,
The electrifying control circuit is in series with the normally closed switch of the 4th intermediate relay KA4.
4. variable-frequency motor cooling control system according to claim 1, which is characterized in that the secondary circuit further includes control
Selection circuit processed, including power supply line access fuse are followed by selecting the output terminal concatenation of switch SA into selection switch SA
N line is accessed after external terminal and the first intermediate relay KA1 coil, and another terminal of switch SA is selected to access cut-off push button
SB2, cut-off push button SB2 output end access the normal open switch of parallel connection start button SB1 and the second intermediate relay KA2, and starting is pressed
The coil that the second intermediate relay KA2 is accessed behind the normal open switch output end of button SB1 and the second intermediate relay KA2 interflow is followed by
Enter N line；
Cooling blower control circuit access is accessed in circuit in the normal open switch and second of the first intermediate relay KA1 in parallel
Between relay KA2 normal open switch；
It is accessed in the start-up circuit of frequency converter VVVF among the auxiliary normal open switch and second of the first intermediate relay KA1 in parallel
The auxiliary normal open switch of relay KA2.
5. variable-frequency motor cooling control system according to claim 4, which is characterized in that the secondary circuit further includes
Frequency converter failure and indicating circuit,
The frequency converter failure and indicating circuit includes power supply L3 line and fuse FU1, the downstream fuse FU1 frequency converter VVVF
Failure input port and picked out from failure output terminal mouth, after picking out connect the 4th intermediate relay KA4 coil after connect N line,
In the control selections circuit, in the selection upstream switch SA or the first intermediate relay KA1 coil and intermediate relay
The downstream tandem at the interflow device coil KA2 has the normally closed switch of the 4th intermediate relay KA4.
6. variable-frequency motor cooling control system according to any one of claims 1 to 5, which is characterized in that the secondary electricity
Road further includes failure alarm circuit, and the failure alarm circuit includes power supply L3 line and fuse FU1, fuse FU1 leading-out terminal
It is connected with the normal open switch end of incoming cables of the 4th intermediate relay KA4, the normal open switch output end and report of the 4th intermediate relay KA4
Alert one end indicator light HL5 is connected.
7. variable-frequency motor cooling control system according to any one of claims 1 to 5, which is characterized in that the secondary electricity
Road further includes power supply instruction circuit, and the power supply instruction circuit includes power supply L3 line and fuse FU1, fuse FU1 outlet
Power supply indicator HL1 is connected between end and neutral conductor N.
8. variable-frequency motor cooling control system according to any one of claims 1 to 5, which is characterized in that the frequency converter
The model ACS510 of VVVF.
9. variable-frequency motor cooling control system according to any one of claims 1 to 5, which is characterized in that the secondary electricity
Road further includes cooling fan control circuit, and the cooling fan control circuit includes power supply L3 line and fusing FU1, fuse FU1
Leading-out terminal is connected with the input terminal of the normal open switch of the KA1 of intermediate relay, the second intermediate relay KA2 respectively, among first
Relay KA1, the second intermediate relay KA2 normal open switch output end interflow after be connected with cooling fan M input terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920364623.5U CN209313422U (en) | 2019-03-21 | 2019-03-21 | A kind of variable-frequency motor cooling control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920364623.5U CN209313422U (en) | 2019-03-21 | 2019-03-21 | A kind of variable-frequency motor cooling control system |
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| CN209313422U true CN209313422U (en) | 2019-08-27 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993464A (en) * | 2019-12-31 | 2020-04-10 | 缙云叶普电子科技有限公司 | Cooling protection device for preventing circuit from overheating |
| CN111852926A (en) * | 2020-07-22 | 2020-10-30 | 新风光电子科技股份有限公司 | Energy-saving fan control system with temperature and humidity detection function and control method |
| CN111911441A (en) * | 2020-04-24 | 2020-11-10 | 中车大同电力机车有限公司 | Locomotive fan control circuit |
| CN116480613A (en) * | 2023-04-14 | 2023-07-25 | 广东南华西电气有限公司 | Variable frequency fan control system |
-
2019
- 2019-03-21 CN CN201920364623.5U patent/CN209313422U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110993464A (en) * | 2019-12-31 | 2020-04-10 | 缙云叶普电子科技有限公司 | Cooling protection device for preventing circuit from overheating |
| CN111911441A (en) * | 2020-04-24 | 2020-11-10 | 中车大同电力机车有限公司 | Locomotive fan control circuit |
| CN111911441B (en) * | 2020-04-24 | 2022-07-26 | 中车大同电力机车有限公司 | Locomotive fan control circuit |
| CN111852926A (en) * | 2020-07-22 | 2020-10-30 | 新风光电子科技股份有限公司 | Energy-saving fan control system with temperature and humidity detection function and control method |
| CN111852926B (en) * | 2020-07-22 | 2022-04-08 | 新风光电子科技股份有限公司 | Energy-saving fan control system with temperature and humidity detection function and control method |
| CN116480613A (en) * | 2023-04-14 | 2023-07-25 | 广东南华西电气有限公司 | Variable frequency fan control system |
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