CN214281020U - Anti-interference electric control system of frequency converter - Google Patents
Anti-interference electric control system of frequency converter Download PDFInfo
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- CN214281020U CN214281020U CN202120188444.8U CN202120188444U CN214281020U CN 214281020 U CN214281020 U CN 214281020U CN 202120188444 U CN202120188444 U CN 202120188444U CN 214281020 U CN214281020 U CN 214281020U
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Abstract
The utility model relates to an electric control system is prevented shaking by converter, including first converter, second converter, the first three-phase AC power supply of the same kind, second way three-phase AC power supply, power cabinet and load motor, the same load motor is all connected to the three-phase output of being qualified for the next round of competitions of first converter and second converter, the voltage signal and the power cabinet electric connection of first converter and second converter, the control power supply of first converter, second converter and power cabinet is the UPS power supply. The utility model discloses a two way power supply supplies power for first converter and second converter respectively, and the power supply of first converter is the AC bus of difference with the power supply of second converter, and first way power supply goes wrong, and the second way lasts the power supply, and the consumer can not appear frequency decline, shuts down etc. and shake the electric phenomenon, has thoroughly solved the undulant equipment trouble that causes of electric wire netting, has shut down the scheduling problem.
Description
Technical Field
The utility model belongs to the technical field of electric, electronic equipment, especially, electric control system is prevented shaking by converter.
Background
The power supply 'power interference' is a random phenomenon of voltage transient of a power supply network caused by the problems of lightning, power plant faults, line grounding, short circuit and the like in a power system. Because the frequency converter has the protection functions of overvoltage, voltage loss, instantaneous power failure, restarting, stopping and the like, voltage disturbance causes the voltage jump of a direct current bus in the middle of the frequency converter, when the voltage of a power grid is lower than 10% of a rated value, and the frequency converter is powered down when the voltage reduction time is more than 10ms, under-voltage faults occur, and an alternating current motor is stopped due to power loss, so that the continuous production process flow is interrupted, and great damage is caused to production and equipment.
Various driving motors or other electric equipment used by the existing industrial and mining enterprises can be shut down if voltage fluctuation, voltage sag or short-time power failure (3-5 seconds) occurs, so that equipment is shut down, local device fluctuation is slightly caused, and environmental pollution and future generations are seriously caused. How to solve the problems of motor, electric equipment halt and equipment halt caused by power grid fluctuation, voltage sag or power failure becomes the subject of research of technicians in the field.
The anti-interference problem of the electric equipment always puzzles designers, the designers cannot be thoroughly solved for a long time, the technicians cannot solve the problem in a plurality of modes in the prior art, and the main solution comprises the following two types:
1. the anti-interference relay is adopted to solve the anti-interference problem, but when the main incoming line of the frequency converter is interfered with electricity, the frequency conversion frequency is reduced, and the frequency converter can be started and stopped again, and the change can not meet the requirement on occasions with high process requirements;
2. utilize to open the button that stops control circuit to change and solve and prevent shaking electric problem, but this button is opposite with button switching point commonly used, and this button just becomes unconventional product like this, is not convenient for manage and use, so prevent shaking electric problem and not thoroughly solve for a long time all the time, and the utility model discloses thoroughly solved this problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a converter and prevented shaking electric control system, solved the problem that motor shut down, equipment shut down that the condition such as electric wire netting is undulant, voltage sag or have a power failure caused.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The utility model provides a its technical problem take following technical scheme to realize:
a frequency converter anti-interference electric control system comprises a first frequency converter, a second frequency converter, a first path of three-phase alternating current power supply, a second path of three-phase alternating current power supply, a power cabinet and a load motor, wherein the first path of three-phase alternating current power supply is used for supplying power to the first frequency converter, the second path of three-phase alternating current power supply is used for supplying power to the second frequency converter, three-phase outgoing line outputs of the first frequency converter and the second frequency converter are both connected with the same load motor, voltage signals of the first frequency converter and the second frequency converter are electrically connected with the power cabinet, and control power supplies of the first frequency converter, the second frequency converter and the power cabinet are all UPS power supplies;
the first frequency converter is connected with a first path of three-phase alternating-current power supply L1-1, L1-2 and L1-3, and the second frequency converter is connected with a second path of three-phase alternating-current power supply L2-1, L2-2 and L2-3;
the three-phase outlet terminal of the first frequency converter is connected with a load motor through an alternating current contactor 1KM1, the three-phase outlet terminal of the second frequency converter is connected in parallel with an alternating current contactor 1KM1 connected with the three-phase outlet terminal of the first frequency converter through an alternating current contactor 2KM1, and the first frequency converter is connected with the load motor through an alternating current fast fuse group 3FU2 after being connected in parallel with the contactor of the second frequency converter;
moreover, the direct current output terminals UDC + and UDC-of the first frequency converter are connected with the direct current loop output terminal of the second frequency converter through a protection circuit, the protection circuit comprises a shunt tripping coil 3QF1 of the direct current molded case circuit breaker and a direct current fusible core 3FU1 connected with the shunt tripping coil in series, and the direct current fusible core 3FU1 is a normally closed point;
moreover, the power cabinet comprises a time relay 3KT1, a direct-current molded case circuit breaker, a switching-off coil, a direct-current quick fuse set, a contactor, an alternating-current quick fuse set 3FU2, a first frequency converter ready indicator lamp 3HB1, a second frequency converter ready indicator lamp 3HB2, a direct-current switching-on indicator lamp 3HB3 and a terminal strip;
the direct-current switching-on and switching-off control circuit of the first frequency converter and the second frequency converter comprises a first frequency converter fault signal circuit, a second frequency converter fault signal circuit, a ready signal circuit of the first frequency converter and a ready signal circuit of the second frequency converter, the first frequency converter fault signal circuit, the second frequency converter fault signal circuit, the ready signal circuit of the first frequency converter and the ready signal circuit of the second frequency converter are connected in parallel, the ready indication circuit of the first frequency converter is connected with a first frequency converter ready indicator lamp 3HB1 in the power cabinet, the ready indication circuit of the second frequency converter is connected with a second frequency converter ready indicator lamp 3HB2 in the power cabinet, the direct-current switching-on indication circuit is connected with a direct-current switching-on indicator lamp 3HB3 in the power cabinet through a direct-current breaker 3QF1, and the switching-off direct-current circuit is connected with a switching-off coil 3QF1/YO in series, the running state loop is characterized in that a first frequency converter of the running state loop is connected with a running state signal of a second frequency converter in parallel and is connected with a power-off delay time relay 3KT1 in series;
moreover, an operation column is connected with the first frequency converter, the operation column comprises an ammeter, a first frequency converter operation indicator lamp 1HB1, a first frequency converter stop indicator lamp 1HB2 and a first frequency converter fault indicator lamp 1HB 3;
moreover, the control loop of the first frequency converter comprises a start-stop loop of the first frequency converter, a KM pull-in loop of the first frequency converter, an operation loop of the first frequency converter, a fault loop of the first frequency converter and a ready loop of the first frequency converter, the operation loop of the first frequency converter, the fault loop of the first frequency converter and the ready loop of the first frequency converter are respectively connected with an intermediate relay 1KA2, an intermediate relay 1KA3 and an intermediate relay 1KA0 in series, an intermediate relay 1KA2 of the operation loop of the first frequency converter is connected with an operation indication signal of the first frequency converter and a stop indication signal of the first frequency converter in parallel, the intermediate relay 1KA2 is a normally open contact when the operation indication signal is, the intermediate relay 1KA2 is a normally closed contact when the stop indication signal is, the operation indication signal of the first frequency converter is connected with a first frequency converter operation indication lamp 1HB1 of the operation column, the stop indication signal of the first frequency converter is connected with a first frequency converter stop indication lamp 1HB2 of the operation column, a fault loop of the first frequency converter is connected with a first frequency converter fault indication signal in parallel, and the first frequency converter fault indication signal is connected with a first frequency converter fault indication lamp 1HB3 of the operation column;
moreover, the control loop of the second frequency converter comprises a start-stop loop of the second frequency converter, a KM (KM) suction loop of the second frequency converter, a delay start loop of the second frequency converter, an operation loop of the second frequency converter, a fault loop of the second frequency converter and a standby loop of the second frequency converter, wherein the operation loop of the second frequency converter, the fault loop of the second frequency converter and the standby loop of the second frequency converter are respectively connected with the intermediate relays 2KA2, 2KA3 and 2KA0 in series;
and the time-delay start-stop second frequency converter loop is connected with a second frequency converter contactor auxiliary contact 2KM1 and a time relay 2KT1 in series.
The utility model has the advantages that:
1. the utility model discloses a three-phase AC power supply of the first way of frequency converter anti-interference electric control system comes from different AC generating line with second way three-phase AC power supply, adopt two way power supply to supply power for first frequency converter and second frequency converter respectively, the first way power supply goes wrong, the second way all has the electricity all the time, consumer can not the decline of frequency, shut down the electricity shaking phenomenon such as shut down even, the equipment trouble that the electric wire netting fluctuation caused has thoroughly been solved, the scheduling problem stops operating, thereby the condition that the electricity shaking appears has been avoided.
2. The utility model discloses an electric control system is prevented shaking by converter, the control circuit of first converter, the control circuit of second converter and the control circuit of power cabinet all adopt the UPS power supply, the control circuit of current converter is same power supply unit with the power supply of converter, if the electric wire netting is undulant for this power supply unit appearance, then control circuit will appear unusually, first converter just can not normally work, fault phenomena such as shut down will appear, after control circuit adopted the UPS power supply, this problem obtains fine solution.
3. The utility model discloses a direct current loop UDC +, UDC-of two frequency conversions of electric control system are prevented shaking by the converter links to each other through protection circuit, the direct current links to each other is in order to guarantee the anti-electricity-dazzling function of two frequency conversions, when the upper inlet wire voltage of a frequency conversion shakes electricity, converter input three-phase alternating current can take place to fall in the twinkling of an eye, thereby make direct current voltage after the rectification fall, the frequency conversion just also does not have enough electric energy contravariant and goes out the alternating current, link to each other the direct current loop of two frequency conversions, just be in order to guarantee direct current voltage's stability, thereby guarantee the stability of contravariant output.
4. The utility model discloses a first converter and second converter leading-out terminal of frequency converter anti-dazzling electric control system establish ties respectively has ac contactor and complex exchange quick fuse group with it, when a frequency conversion operation drags the load, the ac contactor actuation that the operation converter is connected, and the ac contactor disconnection that another frequency converter is connected, thereby solved and prevented the reverse power transmission of frequency converter, realize the ac contactor interlocking function of two converters, through connecting exchange quick fuse group at the front end of load motor, can realize when the motor overcurrent fault appears in first frequency converter dragging motor, the automatic start second converter this moment, exchange quick fuse group 3FU2 and carry out the fusing protection, prevent that the second converter from restarting the load motor.
5. The utility model discloses an electric control system is prevented shaking by converter adopts manual or automatic mode to open and stops the second converter, when first converter three-phase AC supply is qualified for the next round of competitions the trouble, fault signal through Distributed Control System (DCS), can open through manual rotary switch or through the time relay of circular telegram time delay after the time delay and stop the second converter, drag the load operation by the second converter, thereby the function that the frequency conversion heat was equipped with has been realized, and at the switching-over in-process, the converter belongs to online switching, the running signal can be interrupted, the time shielding that will interrupt through outage time delay time relay 3KT1 falls, thereby can guarantee the not chain shutdown protection of DCS.
Drawings
FIG. 1 is a schematic view of the apparatus connection of the present invention;
fig. 2 is a schematic circuit diagram of a first frequency converter of the present invention;
fig. 3 is a schematic circuit diagram of a second frequency converter of the present invention;
fig. 4 is a protection circuit diagram of the dc circuit of the first frequency converter and the second frequency converter of the present invention;
fig. 5 is a circuit diagram of a switching control circuit of the first frequency converter and the second frequency converter of the present invention;
fig. 6 is a circuit diagram of a control loop and a start/stop control circuit of the first frequency converter of the present invention;
fig. 7 is a circuit diagram of a control loop and a start/stop control circuit of the second frequency converter of the present invention;
fig. 8 is a circuit diagram of a control unit of the second frequency conversion of the manual start/stop mode of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
A frequency converter anti-interference electric control system is shown in figure 1 and comprises a first frequency converter, a second frequency converter, a first three-phase alternating-current power supply, a second three-phase alternating-current power supply, a power cabinet and a load motor, wherein the first three-phase alternating-current power supply is used for supplying power to the first frequency converter, the second three-phase alternating-current power supply is used for supplying power to the second frequency converter, three-phase outgoing line outputs of the first frequency converter and the second frequency converter are connected with the same load motor, voltage signals of the first frequency converter and the second frequency converter are electrically connected with the power cabinet, a display signal of the first frequency converter is electrically connected with an operation column, and control power supplies of the first frequency converter, the second frequency converter and the power cabinet are all powered by a UPS. Thereby solve and take place the thunder and lightning in running into electric power system, power plant's trouble, line ground, short circuit scheduling problem, realize when the first power supply of the same kind goes wrong, the state signal transmission of first converter to Distributed Control System (DCS), control signal through Distributed Control System (DCS) realizes that manual or automatic mode opens and stops the second converter, thereby make the power supply of consumer can not appear the frequency decline, shut down the electricity shaking phenomenon such as even, the equipment trouble that the electric wire netting fluctuation caused, the mesh of stopping etc. has thoroughly been solved.
In this embodiment, as shown in fig. 2 to 4, the first frequency converter is connected to the first three-phase ac power supply L1-1, L1-2, and L1-3, and the second frequency converter is connected to the second three-phase ac power supply L2-1, L2-2, and L2-3, so that the first three-phase ac power supply and the second three-phase ac power supply are from different ac buses, and therefore, the two three-phase ac power supply buses are prevented from being in a brown-out state at the same time.
In this embodiment, the three-phase outgoing line terminal of the first frequency converter is connected to the load motor through an ac contactor 1KM1, the three-phase outgoing line terminal of the second frequency converter is connected in parallel with the ac contactor 1KM1 connected to the three-phase outgoing line terminal of the first frequency converter through an ac contactor 2KM1, the first frequency converter is connected to the load motor through an ac fast fuse set 3FU2 after being connected in parallel with the contactor of the second frequency converter, the ac contactors are respectively connected in series with the first frequency converter and the second frequency converter, when one frequency converter operates to pull the load, the ac contactor connected to the operating frequency converter is pulled in, and the ac contactor connected to the other frequency converter is disconnected, thereby preventing reverse power transmission of the frequency converters, realizing the ac contactor interlocking function of the two frequency converters, and when the first frequency converter pulls the motor and has an overcurrent fault by connecting the ac fast fuse set at the front end of the load motor, the second frequency converter is automatically started at the moment, the AC quick fuse group 3FU2 is subjected to fuse protection, and the second frequency converter is prevented from being electrically shocked to start the load motor again.
In this embodiment, the dc output terminals (UDC + and UDC-) of the first frequency converter are connected to the dc loop output terminal of the second frequency converter through a protection circuit, when voltage interference occurs in the ac power supply of the first frequency converter, the input three-phase ac power supply of the first frequency converter will drop instantaneously, so that the dc voltage after rectification drops, the first frequency converter does not have enough electric energy to invert the ac power, and the two dc loops of the frequency converters are connected to each other, so that the dc voltage is always kept at 1.35 times of the incoming line voltage, that is, the two frequency converters always keep working, thereby ensuring that when the interference occurs, the dc voltage of at least 1 frequency converter is stable, ensuring that the inverted ac voltage of the dragging load is stable, and thus implementing the function of preventing interference.
In this embodiment, the protection circuit includes a shunt trip coil 3QF1 of the dc molded case circuit breaker and a dc fuse core 3FU1 connected in series with the shunt trip coil, where the dc fuse core 3FU1 is a normally closed point, and when the dc circuit passes through a current, the dc fuse core 3FU1 performs a fast fuse protection.
In this embodiment, the first way three-phase alternating current power supply with be equipped with first little circuit breaker 1QF1 between the first converter, the second way three-phase alternating current power supply with be equipped with second little circuit breaker 2QF1 between the second converter, when the purpose is making things convenient for equipment trouble, carry out the outage maintenance.
In this embodiment, the power cabinet includes time relay 3KT1, direct current moulded case circuit breaker and separating brake coil, the quick fuse of direct current group, contactor, the quick fuse of interchange group 3FU2, first converter ready pilot lamp 3HB1, the second converter ready pilot lamp 3HB2, direct current combined floodgate pilot lamp 3HB3 and terminal row, control circuit is equipped with the circuit breaker among the power cabinet, and the power supply of current converter is same power supply unit, if the electric wire netting is undulant for this power supply unit, then control circuit will appear unusually, and the converter just can not normally work, will appear fault phenomena such as shut down, and after control circuit adopted the UPS power supply, this problem obtained fine solution.
In this embodiment, first converter is connected with the action column, the action column includes the ampere meter, first converter operation pilot lamp 1HB1, first converter stop pilot lamp 1HB2 and first converter fault pilot lamp 1HB3, set up current transformer 1CT between contactor 1KM1 and the three-phase leading-out terminals of first converter, the inductive current 1CT1, 1CT2 and the action column electric connection of current transformer 1CT cause the damage to equipment components and parts because of the current wave is too big in the twinkling of an eye in the numerical protection circuit of ampere meter on the action column, finally play the protective action.
In this embodiment, as shown in fig. 5, the dc switching-on/off control circuit of the first and second frequency converters includes a first frequency converter fault signal circuit, a second frequency converter fault signal circuit, a ready signal circuit of the first frequency converter and a ready signal circuit of the second frequency converter, the first frequency converter fault signal circuit, the second frequency converter fault signal circuit, the ready signal circuit of the first frequency converter and the ready signal circuit of the second frequency converter are connected in parallel, the ready indication circuit of the first frequency converter is connected with a first frequency converter ready indicator lamp 3HB1 in the power cabinet, the ready indication circuit of the second frequency converter is connected with a second frequency converter ready indicator lamp 3HB2 in the power cabinet, the dc indication circuit is connected with a dc closing indicator lamp 3HB3 in the power cabinet through a dc breaker 3QF1, the switching-off dc circuit is connected with a switching-on coil 3QF1/YO in series, the running state signal series connection of the parallelly connected second converter of running state return circuit has outage time delay relay 3KT1, and when the fault signal of receiving first converter or second converter or when not having the ready signal, direct current circuit breaker 3QF1 all can automatic separating brake protection, and the ready signal of first converter and second converter and direct current circuit breaker's deciliter status signal all can show at the pilot lamp of power cabinet face, conveniently tours personnel's inspection, the operation.
In this embodiment, as shown in fig. 6, the control loop of the first frequency converter includes a start-stop loop of the first frequency converter, a KM pull-in loop of the first frequency converter, an operation loop of the first frequency converter, a fault loop of the first frequency converter, and a ready loop of the first frequency converter, the operation loop of the first frequency converter, the fault loop of the first frequency converter, and the ready loop of the first frequency converter are respectively connected in series with an intermediate relay 1KA2, 1KA3, and 1KA0, the intermediate relay 1KA2 of the operation loop of the first frequency converter is connected in parallel with an operation indication signal of the first frequency converter and a stop indication signal of the first frequency converter, the intermediate relay 1KA2 is a normally open contact when the operation indication signal is the normally open contact, the intermediate relay 1KA2 is a normally closed contact when the stop indication signal is the normally closed contact, the operation indication signal of the first frequency converter is connected with a first frequency converter operation indication lamp 1HB1 of the operation column, the stop indication signal of the first frequency converter is connected with a first frequency converter stop indication lamp 1HB2 of an operation column, the fault indication signal of the first frequency converter is connected with a first frequency converter ready (normally closed) in parallel and is a separating brake direct current loop signal, the first frequency converter fault indication signal is connected with a first frequency converter fault indication lamp 1HB3 of the operation column, when the equipment normally operates, an intermediate relay 1KA2 of an operation loop of the first frequency converter is electrified, the actuation enables an intermediate relay 1KA2 normally open contact of the first frequency converter operation indication signal to be closed, the intermediate relay 1KA2 normally closed state of the stop indication signal of the first frequency converter is opened, at the moment, the first frequency converter operation indication lamp 1HB1 is normally on, the first frequency converter operation stop signal 1HB2 lamp is long off, when the intermediate relay 1KA3 of the first frequency converter fault loop receives a control signal, and triggering an intermediate relay 1KA3 of the first frequency converter fault control loop to be closed, so that a fault indication signal 1HB3 of the first frequency converter is normally on, the running state of the first frequency converter can be displayed through the state of an indicator lamp on the operating column, and meanwhile, a control unit signal of the first frequency converter is displayed to a Distributed Control System (DCS).
In this embodiment, as shown in fig. 7, the control loop of the second frequency converter includes a start-stop loop of the second frequency converter, a KM pull-in loop of the second frequency converter, a delay start-stop loop of the second frequency converter, an operation loop of the second frequency converter, a fault signal loop of the second frequency converter, and a ready signal loop of the second frequency converter, where the operation signal loop of the second frequency converter, the fault signal loop of the second frequency converter, and the ready signal loop of the second frequency converter are respectively connected in series with the intermediate relays 2KA2, 2KA3, and 2KA0,
the first embodiment is as follows:
in this embodiment, as shown in fig. 5 to 7, the second frequency converter is automatically started and stopped,
the KM attracting loop of the first frequency converter is connected in parallel to a start-stop loop of the first frequency converter, the KM attracting loop of the first frequency converter is connected in parallel to the start-stop loop of the first frequency converter, the KM attracting loop of the first frequency converter comprises a start signal unit, a stop signal unit and an allowing signal unit, the stop signal unit comprises a normally closed operating column stop signal unit LOC _ T and a normally closed DCS stop signal unit DCS _ T which are connected in series, the start signal unit comprises an operating column start signal unit LOC _ Q which is connected in parallel to a DCS start signal unit DCS _ Q, and the allowing signal unit comprises a DCS allowing operation signal unit DCS _ PM.
The start signal unit allows the signal unit DCS _ PM and the first intermediate relay 1KA1 to be connected in series through DCS, the first time relay 1KA1 is connected with the intermediate relay 1KA3 of the first frequency converter fault loop in series, and the intermediate relay 1KA3 of the first frequency converter fault loop is a normally closed contact.
The KM pull-in loop of the first frequency converter is connected in series with an intermediate relay 1KA1, a normally closed second frequency converter contactor 2KM1 and a first frequency converter contactor coil 1KM1, the first frequency converter contactor coil 1KM1 is arranged in the power cabinet,
the KM actuation return circuit that opens of second converter and delay start-stop second converter return circuit are parallelly connected to the start-stop return circuit of second converter, the start-stop return circuit of second converter is established ties there are rotary switch 2SA1, first converter trouble auxiliary relay 1KA1, second auxiliary relay 2KA1, second converter trouble auxiliary relay 2KA3 and exchanges quick fuse group 3FU2, auxiliary relay 2KA3 and exchange quick fuse group 3FU2 are normally closed contact.
The KM attracting loop of the second frequency converter is connected with an intermediate relay 2KA1, a normally closed first frequency converter contactor 1KM1 and a second frequency converter contactor coil 2KM1 in series, the second frequency converter contactor coil 2KM1 is arranged in the power cabinet, and the first frequency converter contactor 2KM1 is interlocked with the second frequency converter contactor 1KM 1.
The time delay start-stop second frequency converter loop is connected in series with a second frequency converter contactor auxiliary contact 2KM1 and a time relay 2KT1, and a normally open point of the time relay 2KT1 starts the second frequency converter.
The rotary button 2SA1 of the second frequency converter is set to be at a standby/stop position, and if the second frequency converter needs to be stopped, the rotary button 2SA1 is rotated to the stop position.
The working principle is as follows:
in daily work, when the first frequency converter is faultless, normal work drags the load motor to operate, the DCS display system operates normally, and the first frequency converter can be normally stopped through the operation column stop signal unit LOC _ T or the DCS stop signal unit DCS _ T. Only when first converter trouble back, the auxiliary relay 1KA3 of first converter trouble return circuit gets electric, first auxiliary relay 1KA1 loses electric, and first converter contactor 1KM1 loses electric, and the stop signal of first converter sends on the DCS system. If the switch button 2SA1 of the second frequency converter is in the standby position; if the second frequency converter has no fault signal, the intermediate relay 2KA3 does not act; if it has no action to exchange quick fuse group 3FU2 (exchange quick fuse group 3FU2 for the protection motor, the motor overflows, exchanges quick fuse group 3FU2 fusing, and the restart can lead to the fact secondary damage to the motor), can direct start the second converter makes the second auxiliary relay 2KA1 actuation that the second converter establishes ties makes the KM actuation return circuit of second converter establishes ties and has auxiliary relay 2KA1 closed, second converter contactor coil 2KM1 gets electric, the time delay opens and stops second converter contactor auxiliary contact 2KM1 closure that the second converter return circuit establishes ties, makes time relay 2KT1 gets electric through the time delay back, opens and stops second converter operation and drag load work, because first converter and second converter belong to online switching in the switching process, the running signal can be interrupted, through the running state signal series connection of the parallelly connected second converter of running state return circuit first converter has outage time delay, and the second converter The time relay 3KT1 shields the interrupted time, so that when the first frequency converter fails and is automatically switched to the second frequency converter, an operation signal time is continuously provided for the DCS, and the DCS is not subjected to chain shutdown protection.
When the system is in power-off state, direct current parts UDC + and UDC-of the two frequency converters are connected through a protection circuit, so that the frequency conversion cannot give an alarm, and the system cannot be in power-off state.
Example two:
in this embodiment, as shown in fig. 8, in order to start and stop the second frequency converter manually,
the start-stop control unit of the first frequency converter and the second frequency converter comprises a normally closed operation column stop signal unit LOC _ T which is connected with a normally closed DCS stop signal unit DCS _ T in series through an operation signal unit, the DCS stop signal unit is connected with an intermediate relay KA1 in series, the operation signal unit is connected with an operation column start signal unit LOC _ Q, DCS start signal unit DCS _ Q in parallel, a start-stop contactor contact 1KM1 of the first frequency converter and a start-stop contactor contact 2KM1 of the second frequency converter,
the rotary button SA of operation post is parallelly connected with the start-stop circuit of opening of first converter and the start-stop circuit of second converter, the start-stop circuit of first converter has normally closed contactor 2KM1 through auxiliary relay KA1 series connection, normally closed contactor 2KM1 has first converter start-stop control's start-stop contactor 1KM1 coil through normally closed fault return circuit 1KA3 series connection of first converter, the selection of second converter is opened and is stopped the return circuit and is established ties through auxiliary relay KA1 and have normally closed contactor 1KM1, normally closed contactor 2KM1 has first converter start-stop control's start-stop contactor 2KM1 coil through normally closed fault return circuit 2KA3 series connection of second converter, rotary button SA is equipped with the owner/is equipped with the position, and the main position is first frequency conversion position, and reserve position is the second frequency conversion position.
The working principle is as follows:
in daily work, a manual rotating SA button is arranged at the position of a first frequency converter, the first frequency converter normally works to drag a load motor to operate, a DCS display system normally operates, after the first frequency converter fails, a normally closed fault loop 1KA3 in a start-stop loop of the first frequency converter selectively sends a fault signal to the DCS, at the moment, an operator rotates to a standby position through the manual rotating SA button, and a second frequency converter is restarted through a start signal unit LOC _ Q of an operation column or a start signal unit DCS _ Q of the DCS. At the moment, a start-stop contactor 2KM1 in the second frequency converter is triggered, a start-stop contactor contact 2KM1 of the second frequency converter triggers an intermediate relay to pull in through a current signal passing through the intermediate relay KA1, and the second frequency converter is normally started at the moment.
When the system is in power-off state, direct current parts UDC + and UDC-of the two frequency converters are connected through a protection circuit, so that the frequency conversion cannot give an alarm, and the system cannot be in power-off state.
It should be emphasized that the embodiments described herein are illustrative and not restrictive, and thus the present invention includes but is not limited to the embodiments described in the detailed description, as well as other embodiments derived from the technical solutions of the present invention by those skilled in the art, which also belong to the scope of the present invention.
Claims (10)
1. The utility model provides a converter prevents shaking electric control system which characterized in that: the power supply system comprises a first frequency converter, a second frequency converter, a first path of three-phase alternating-current power supply, a second path of three-phase alternating-current power supply, a power cabinet and a load motor, wherein the first path of three-phase alternating-current power supply is used for supplying power to the first frequency converter, the second path of three-phase alternating-current power supply is used for supplying power to the second frequency converter, three-phase outgoing line outputs of the first frequency converter and the second frequency converter are both connected with the same load motor, voltage signals of the first frequency converter and the second frequency converter are electrically connected with the power cabinet, and control power supplies of the first frequency converter, the second frequency converter and the power cabinet are all UPS power supplies;
the control circuit of first converter includes the KM actuation return circuit, the operation return circuit of first converter, the trouble return circuit of first converter, the ready return circuit of first converter of opening and shutting return circuit, first converter, the operation return circuit of first converter, the trouble return circuit of first converter, the ready return circuit of first converter establish ties auxiliary relay 1KA2, 1KA3 and 1KA0 respectively, auxiliary relay 1KA2 of the operation return circuit of first converter connects in parallel has the operation indicating signal of first frequency conversion and the stop indicating signal of first converter, auxiliary relay 1KA2 is the normally open contact at operation indicating signal, auxiliary relay 1KA2 is the normally closed contact at stop indicating signal.
2. The frequency converter anti-interference control system according to claim 1, characterized in that: the first frequency converter is connected with a first path of three-phase alternating-current power supply L1-1, L1-2 and L1-3, and the second frequency converter is connected with a second path of three-phase alternating-current power supply L2-1, L2-2 and L2-3.
3. The frequency converter anti-interference control system according to claim 1, characterized in that: the three-phase outlet terminal of the first frequency converter is connected with a load motor through an alternating current contactor 1KM1, the three-phase outlet terminal of the second frequency converter is connected with an alternating current contactor 1KM1 connected with the three-phase outlet terminal of the first frequency converter in parallel through an alternating current contactor 2KM1, and the first frequency converter is connected with the load motor through an alternating current quick fuse group 3FU2 after being connected with the contactor of the second frequency converter in parallel.
4. The frequency converter anti-interference control system according to claim 1, characterized in that: the direct current output terminal UDC + and UDC-of the first frequency converter are connected with the direct current loop output terminal of the second frequency converter through a protection circuit, the protection circuit comprises a shunt tripping coil 3QF1 of the direct current molded case circuit breaker and a direct current fusible core 3FU1 connected with the shunt tripping coil in series, and the direct current fusible core 3FU1 is a normally closed point.
5. The frequency converter anti-interference control system according to claim 1, characterized in that: the power cabinet comprises a time relay 3KT1, a direct-current molded case circuit breaker, a switching-off coil, a direct-current quick fuse set, a contactor, an alternating-current quick fuse set 3FU2, a first frequency converter ready indicator lamp 3HB1, a second frequency converter ready indicator lamp 3HB2, a direct-current switch-on indicator lamp 3HB3 and a terminal block.
6. The frequency converter anti-interference control system according to claim 1, characterized in that: the direct-current switching-on and switching-off control circuit of the first frequency converter and the second frequency converter comprises a first frequency converter fault signal circuit, a second frequency converter fault signal circuit, a ready signal circuit of the first frequency converter and a ready signal circuit of the second frequency converter, the first frequency converter fault signal circuit, the second frequency converter fault signal circuit, the ready signal circuit of the first frequency converter and the ready signal circuit of the second frequency converter are connected in parallel, the ready indication circuit of the first frequency converter is connected with a first frequency converter ready indicator lamp 3HB1 in the power cabinet, the ready indication circuit of the second frequency converter is connected with a second frequency converter ready indicator lamp 3HB2 in the power cabinet, the direct-current switching-on indication circuit is connected with a direct-current switching-on indicator lamp 3HB3 in the power cabinet through a direct-current breaker 3QF1, the switching-off direct-current circuit is connected with a switching-off coil 3QF1/YO in series, and the running state is that the first frequency converter is connected with the second frequency converter in series and the second frequency converter in parallel connection with a power-off signal and has a power failure delay function A time relay 3KT 1.
7. The frequency converter anti-interference control system according to claim 1, characterized in that: the first converter is connected with the operation post, the operation post includes the ampere meter, first converter operation pilot lamp 1HB1, first converter stop indicator lamp 1HB2 and first converter trouble pilot lamp 1HB 3.
8. The frequency converter anti-interference control system according to claim 7, wherein: the operation indicating signal of first frequency conversion with the first converter operation pilot lamp 1HB1 of action post is connected, the stop indicating signal of first frequency converter with the first converter stop indicator lamp 1HB2 of action post is connected, the fault loop of first frequency converter connects in parallel has first converter trouble indicating signal, first converter trouble indicating signal with the first converter trouble pilot lamp 1HB3 of action post is connected.
9. The frequency converter anti-interference control system according to claim 1, characterized in that: the control loop of the second frequency converter comprises a start-stop loop of the second frequency converter, a KM (KM) suction loop of the second frequency converter, a delay start loop of the second frequency converter, an operation loop of the second frequency converter, a fault loop of the second frequency converter and a ready loop of the second frequency converter, wherein the operation loop of the second frequency converter, the fault loop of the second frequency converter and the ready loop of the second frequency converter are respectively connected with the intermediate relays 2KA2, 2KA3 and 2KA0 in series.
10. The frequency converter anti-interference control system according to claim 9, wherein: the delay start second frequency converter loop is connected in series with a second frequency converter contactor auxiliary contact 2KM1 and a time relay 2KT 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120188444.8U CN214281020U (en) | 2021-01-22 | 2021-01-22 | Anti-interference electric control system of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120188444.8U CN214281020U (en) | 2021-01-22 | 2021-01-22 | Anti-interference electric control system of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214281020U true CN214281020U (en) | 2021-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120188444.8U Active CN214281020U (en) | 2021-01-22 | 2021-01-22 | Anti-interference electric control system of frequency converter |
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| Country | Link |
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| CN (1) | CN214281020U (en) |
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2021
- 2021-01-22 CN CN202120188444.8U patent/CN214281020U/en active Active
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