CN113364356B - Soft start and soft stop device for multiple motors - Google Patents
Soft start and soft stop device for multiple motors Download PDFInfo
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- CN113364356B CN113364356B CN202011021463.8A CN202011021463A CN113364356B CN 113364356 B CN113364356 B CN 113364356B CN 202011021463 A CN202011021463 A CN 202011021463A CN 113364356 B CN113364356 B CN 113364356B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/54—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/54—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors
- H02P1/56—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors simultaneously
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/02—Details of stopping control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
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Abstract
A device for soft starting and soft stopping of a plurality of motors comprises a soft starter control device, a soft starter, M motor control devices, M motors, a communication bus, a three-phase power line and a soft starter output three-phase power line; the soft starter control device carries out information interaction with the soft starter and the M motor control devices through a communication bus; the three-phase power line is connected to the power input end of the soft starter, and the three-phase power line output by the soft starter are respectively connected to the power input ends of the M motor control devices; and output three-phase power lines of the motor control devices are respectively connected to corresponding motors. The invention fully utilizes the redundancy capability of the equipment, saves resources, has simple and easy method, small investment, wide application range and easy popularization.
Description
The technical field is as follows:
the invention relates to a motor control technology and a centralized control technology, in particular to a device for soft starting and soft stopping of a plurality of motors.
The background art comprises the following steps:
with the rapid development of power electronic technology, soft starters are gradually widely used. The soft starter is a novel motor control device integrating soft start, soft stop, light load energy conservation and multifunctional protection, and fundamentally overcomes many defects of the traditional voltage reduction starting device. However, the soft starter is only put into operation when the motor needs soft start or soft stop, and after the motor enters normal operation, the soft starter is in an idle state, which causes resource waste; and when the number of motors is large, the soft starter and the motors are configured one to one, which increases the difficulty of capital investment. Therefore, engineering technicians provide various schemes to solve the problem that one soft starter sequentially starts and stops a plurality of motors according to actual engineering requirements. However, when the number of the motors is large and the distance between the motors is long, the existing method or scheme has the problems of complex and tedious wiring, difficult installation and maintenance, single function and the like. Moreover, these existing methods cannot be implemented when the sequence of starting or stopping needs to be changed temporarily, or when the interval between the soft start of two devices needs to be inserted temporarily for another device which is already running to perform soft stop \8230;, and so on.
The invention content is as follows:
the invention aims to provide a device for soft starting and soft stopping of a plurality of motors.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a device for soft starting and soft stopping a plurality of motors comprises a soft starter control device, a soft starter, M motor control devices, a communication bus, a three-phase power line and an output three-phase power line of the soft starter; the soft starter control device carries out information interaction with the soft starter and the M motor control devices through a communication bus; the three-phase power supply line is connected to the power input end of the soft starter, and the output three-phase power supply line and the three-phase power supply line of the soft starter are respectively connected to the two power input ends of the M motor control devices; and output three-phase motor power lines of the motor control device are respectively connected to corresponding motors.
The soft starter control device comprises a soft starter controller, a keyboard, a display and a printer; the soft starter controller comprises a processor, a memory, an input/output interface, a communication interface and the like; the output of the keyboard is connected to the soft starter controller; the output of the soft starter controller is connected to a display and a printer; and the communication interface of the soft starter controller is respectively connected to the communication bus and the control center.
The motor control device comprises an alternating current contactor A, an alternating current contactor B, a current sensor, a voltage sensor, a temperature sensor, a motor controller, a parking indicator lamp, a soft start indicator lamp, an operation indicator lamp, a soft parking indicator lamp, a fault indicator lamp, a start button, a parking button, an emergency parking button and an emergency braking device, and outputs a three-phase motor power line; in addition, the motor control device also comprises a conventional air switch, a fuse, a leakage protector, an alternating current contactor interlocking protection device and the like; the motor controller internally comprises a processor, a memory, an analog-to-digital conversion unit, a digital-to-analog conversion unit, an amplification unit, a driving unit, an input/output interface, a communication interface and the like; the motor controller carries out information interaction with the soft starter control device through a communication bus; the output three-phase power line of the soft starter is connected to the input end of the alternating current contactor A, the three-phase power line is connected to the input end of the alternating current contactor B, and the output ends of all the alternating current contactors are connected to the motor through the output three-phase motor power line; the motor controller controls the on-off of the alternating current contactor A or the alternating current contactor B, when the motor runs, only one alternating current contactor is kept on, the motor is connected to a specified three-phase power line, and the other alternating current contactor is kept in a power-off state; the output ends of the current sensor, the voltage sensor and the temperature sensor are connected to the input end of the motor controller and are respectively used for monitoring the current, the voltage and the temperature of the motor; the output end of the motor controller is respectively connected to a parking indicator lamp, a soft start indicator lamp, an operation indicator lamp, a soft parking indicator lamp and a fault indicator lamp and is respectively used for indicating the operation condition of the motor and giving a fault alarm; the start button, the stop button, and the emergency stop button are connected to an input of the motor controller, respectively.
Each motor has an equipment number; each motor is also endowed with an equipment weight according to the importance degree of the motor in the whole system; the equipment weight values of the motors can be different, the priority is higher if the equipment weight value is larger, and the priority is lower if the equipment weight value is smaller; or the motors are divided into a plurality of classes according to the requirements of the whole system, and the motors in the same class have the same equipment weight; or all motors are given the same device weight.
Each motor controller can send an operation request signal to the soft starter control device when needed, and the soft starter control device can also generate the operation request signal; each operation request comprises two parts of an operation execution weight and an equipment number; the execution weight value forms a multi-bit numerical value by an operation weight value and an equipment weight value, wherein the operation weight value forms the high order of the multi-bit numerical value, and the equipment weight value forms the low order of the multi-bit numerical value; sequentially endowing different operation weights from large to small for the operation requests of emergency stop, fault alarm, group soft stop, group soft start and soft start, or endowing the same operation weight for certain operations according to actual needs, for example, endowing the same operation weight for group soft start and common soft start of a plurality of motors at the same time, endowing the same operation weight for group soft stop and common soft stop of a plurality of motors at the same time, and the like; the device number is usually the device number of the motor which makes the operation request, but when a plurality of motors need to be soft-started or soft-stopped at the same time, the device number contains the device numbers of all the motors, and the device weight is selected according to a preset rule, for example, the maximum, middle or minimum device weight in the motors is taken as the device weight in the execution weight, or a value is additionally specified as the device weight; meanwhile, the operation weight in the execution weight at this time can be the operation weight of the group soft start and the group soft stop, and can also be the operation weight of the common soft start and the soft stop.
The soft starter control device queues in an operation request queue according to the execution weight of the operation request sent by each motor controller; for operation requests with different execution weights, last-in first-out with a large execution weight and first-in last-out with a small execution weight are executed; for operation requests with the same execution weight, the operation requests are processed in a first-in first-out mode and in a second-in last-out mode.
When an operator presses a start button or a stop button, the motor controller sends an operation request to the soft starter control device to request to implement soft start or soft stop; after receiving the operation requests sent by each motor controller, the soft starter control device queues the operation requests in the operation request queue according to a preset rule, and then sends a reply instruction to the motor controller which provides the operation request according to the operation request which is ranked at the first position; after the motor controller receives a reply instruction of the soft starter control device, the motor controller controls the corresponding alternating current contactor to act, so that the motor is ready to enter soft start or soft stop, the motor controller replies the ready state to the soft starter control device, and meanwhile, a corresponding soft start indicator lamp or a soft stop indicator lamp is lightened; after receiving the prepared reply, the soft starter control device controls the soft starter to execute corresponding operation according to the proposed operation request; after the operation is finished, the soft starter control device sends an operation request finishing signal to the motor controller; and after receiving the operation request completion signal, the motor controller closes the lightened soft start indicator lamp or soft stop indicator lamp and simultaneously lightens the corresponding stop indicator lamp or running indicator lamp.
When an operator presses an emergency stop button, the motor controller immediately cuts off the working alternating current contactor A or alternating current contactor B, starts an emergency braking device to brake the motor, lights a fault indicator lamp, and simultaneously notifies the soft starter control device of emergency braking through a communication bus; after receiving the emergency braking information sent by the motor controller, the soft starter control device displays the relevant working condition on the display, and on one hand, checks whether the operation request relevant to the motor controller is executed or not, and immediately stops the operation request if the operation request is executed, and on the other hand, checks whether the operation request is provided by the motor controller or not in the operation request queue, and if the operation request is provided, deletes the operation request.
The current, the voltage and the temperature of the motor monitored by the current sensor, the voltage sensor and the temperature sensor are transmitted to the motor controller, and then the motor controller transmits the data and the running data of the motor to the soft starter control device in real time through a communication bus; when faults such as overvoltage, overcurrent, phase loss, overheating and the like occur, the motor controller sends a fault signal to the soft starter control device and requests soft stop, after the instruction of the soft starter control device is obtained, the motor controller controls the corresponding alternating current contactor to act, so that the motor enters a soft stop preparation state, sends a ready signal to the soft starter control device, and simultaneously closes the operation indicator lamp and lights the soft stop indicator lamp and the fault indicator lamp; after receiving the prepared signal, the soft starter control device controls the soft starter to execute soft parking operation and simultaneously displays the fault information sent by the motor controller on a display; checking whether an operation request related to the motor controller is being executed or not, if the operation request is being executed, continuing the operation, if the soft stop operation is being executed, immediately stopping the operation request, and if the operation request is being executed, checking whether an operation request provided by the motor controller exists in an operation request queue or not, and if the operation request exists, deleting the operation request; after the soft stop operation is finished, the soft starter control device sends an operation request finishing signal to the motor controller; and after receiving the operation request completion signal, the motor controller closes the lightened soft stop indicator lamp and simultaneously lightens the stop indicator lamp.
The invention has the beneficial effects that:
1. the redundancy capability of the equipment is fully utilized, and resources are saved.
2. The method is simple and easy to use and convenient to implement.
3. Low investment, wide application range and easy popularization.
Description of the drawings:
fig. 1 is a schematic block diagram of a soft start and soft stop device for multiple motors according to the present invention.
Fig. 2 is a schematic block diagram of a soft starter control device in accordance with the present invention.
Fig. 3 is a schematic block diagram of a motor control device of the present invention.
In the figure: 1-soft starter control device (RK), 2-Soft Starter (SS), 3-motor control Device (DK) j J =1, \8230;, M), 4-motor (D) j J =1, \ 8230;, M), 5-communication bus, 6-output three-phase power line (L) 1 ) 7-three-phase power supply line (L) 0 ) (ii) a 101-soft starter controller (RKZ), 102-Keyboard (KB), 103-display (XS), 104-printer (DY); 301-ac contactor a (JR, output three-phase power line connected to soft starter), 302-ac contactor B (JL, connected to three-phase power line), 303-current sensor (AP), 304-voltage sensor (VT), 305-temperature sensor (WD), 306-motor controller (DKZ), 307-stop indicator, 308-soft start indicator, 309-operation indicator, 310-soft stop indicator, 311-fault indicator, 312-start button (QD), 313-stop button (TC), 314-emergency stop button (JJ), 315-emergency braking device (ZD), 316-output three-phase motor power line (L), 13-output three-phase power line (L) 2 )。
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings. However, those skilled in the art will recognize that the following embodiments are exemplary only, and are presented to better enable those skilled in the art to understand the present patent and are not intended to limit the scope of what is encompassed by the present patent; it is intended that all such equivalent constructions, methods, and variations that fall within the spirit of the disclosure, including all equivalents and modifications, be embraced by the scope of this patent.
Referring to fig. 1, 2 and 3, a device for soft starting and soft stopping multiple motors includes a soft starter control device 1 (RK), a soft starter 2 (SS), and M motor control devices 3 (DK) j J =1, \ 8230;, M), M motors 4 (D) j J =1, \ 8230;, M), communication bus, three-phase power supply line 7 (L) 0 ) And an output three-phase power line 6 (L) of the soft starter 2 1 ) (ii) a The soft starter control device 1 carries out information interaction through a communication bus 5 and M motor control devices 3; the three-phase power supply line 7 is connected to the power supply input end of the soft starter 2, and the output three-phase power supply line 6 and the three-phase power supply line 7 of the soft starter 2 are respectively connected to the two power supply input ends of the M motor control devices 3; the output three-phase motor power lines 316 of the motor control device 3 are connected to the corresponding motors 4, respectively.
The soft starter control device 1 comprises a soft starter controller 101, a keyboard 102, a display 103 and a printer 104; the soft starter controller 101 comprises a processor, a memory, an input/output interface, a communication interface and the like; the output of the keypad 102 is connected to the soft starter controller 101; the output of the soft starter controller 101 is connected to a display 103 and a printer 104; the communication interface of the soft starter controller 101 is connected to the communication bus 5 and the control center, respectively.
The motor control device 3 comprises an AC contactor A301, an AC contactor B302, a current sensor 303, a voltage sensor 304, a temperature sensor 305, a motor controller 306, a stop indicator lamp 307, a soft start indicator lamp 308, an operation indicator lamp 309, a soft stop indicator lamp 310, a fault indicator lamp 311, a start buttonButton 312, park button 313, emergency park button 314, emergency brake 315, and output three phase motor power cord 316 (L) 2 ) (ii) a In addition, the motor control device 3 also includes conventional air switches, fuses, leakage protectors, and ac contactor interlock protection devices, which are not shown in the drawings; the motor controller 306 internally comprises a processor, a memory, an analog-to-digital conversion unit, a digital-to-analog conversion unit, an amplification unit, a driving unit, an input/output interface, a communication interface and the like; the motor controller 306 performs information interaction with the soft starter control device 1 through the communication bus 5; an output three-phase power line 6 of the soft starter 2 is connected to the input end of the alternating current contactor A301, a three-phase power line 7 is connected to the input end of the alternating current contactor B302, and the output ends of all the alternating current contactors are connected to the motor 4 through an output three-phase motor power line 316; the motor controller 306 controls the on-off of the alternating current contactor A301 or the alternating current contactor B302, when the motor runs, only one alternating current contactor is kept on, the motor 4 is connected to a specified three-phase power line, and the other alternating current contactor is kept in a power-off state; the output ends of the current sensor 303, the voltage sensor 304 and the temperature sensor 305 are connected to the input end of the motor controller 306 and are respectively used for monitoring the current, the voltage and the temperature of the motor; the output end of the motor controller 306 is respectively connected to a stop indicator lamp 307, a soft start indicator lamp 308, an operation indicator lamp 309, a soft stop indicator lamp 310 and a fault indicator lamp 311, which are respectively used for indicating the operation condition of the motor and giving a fault alarm; the start button 312, the park button 313, and the emergency park button 314 are each coupled to an input of the motor controller 306.
Each motor 4 has an equipment number; according to the importance degree of the motors 4 in the whole system, each motor 4 is also endowed with a device weight; the equipment weights of the motors 4 can be different, the priority is higher if the equipment weights are larger, and the priority is lower if the equipment weights are smaller; or the motors 4 are divided into a plurality of classes according to the requirements of the whole system, and the motors in the same class have the same equipment weight; or all motors are given the same device weight.
Each motor controller 306 may send an operation request signal to the soft starter control device 1 when needed, and the soft starter control device 1 itself may also generate the operation request signal; each operation request comprises two parts of an operation execution weight and an equipment number; the execution weight value forms a multi-bit numerical value by an operation weight value and an equipment weight value, wherein the operation weight value forms the high order of the multi-bit numerical value, and the equipment weight value forms the low order of the multi-bit numerical value; the method comprises the following steps of sequentially endowing operation weights which are different from large to small to the operation requests of emergency stop, fault alarm, group soft stop, group soft start and soft start, or endowing the same operation weight to certain operations according to actual needs, for example, endowing the same operation weight of group soft start and common soft start of a plurality of motors for simultaneously soft start, endowing the same operation weight of group soft stop and common soft stop of a plurality of motors for simultaneously soft stop, and the like; the equipment number is usually the equipment number of the motor which provides the operation request, but when a plurality of motors need to be soft-started or soft-stopped at the same time, the equipment number contains the equipment numbers of all the motors, and the equipment weight is selected according to a preset rule, for example, the maximum, middle or minimum equipment weight in the motors is taken as the equipment weight in the execution weight, or a value is additionally specified as the equipment weight; meanwhile, the operation weight in the execution weight at this time can be the operation weight of the group soft start and the group soft stop, and can also be the operation weight of the common soft start and the soft stop.
The soft starter control device 1 queues up in the operation request queue according to the execution weight of the operation request sent by each motor controller 306; for operation requests with different execution weights, executing last-in first-out with a large execution weight, and executing first-in last-out with a small execution weight; for operation requests with the same execution weight, the operation requests are first in, first out, last in and last out.
When the operator presses the start button 312 or the stop button 313, the motor controller 306 sends an operation request to the soft starter control device 1 to request soft start or soft stop; after receiving the operation requests sent by the motor controllers 306, the soft starter control device 1 queues the operation requests in the operation request queue according to a predetermined rule, and then sends a reply instruction to the motor controller 306 which has made the operation request according to the operation request which is ranked at the first position; after the motor controller 306 receives a reply instruction of the soft starter control device 1, the motor controller 306 controls the corresponding ac contactor to act, so that the motor 4 is ready to enter soft start or soft stop, and replies to the soft starter control device 1 that the motor is ready, and simultaneously lights the corresponding soft start indicator lamp 308 or soft stop indicator lamp 310; after receiving the prepared reply, the soft starter control device 1 controls the soft starter to execute corresponding operation according to the proposed operation request; after the operation is completed, the soft starter control device 1 sends an operation request completion signal to the motor controller 306 again; upon receiving the operation request completion signal, the motor controller 306 turns off the soft start lamp 308 or the soft stop lamp 310 that has been turned on, and simultaneously turns on the corresponding stop lamp 307 or the run lamp 309.
When the operator presses the emergency stop button 314, the motor controller 306 immediately turns off the ac contactor a301 or the ac contactor B302 that is in operation, starts the emergency brake device 315 to brake the motor 4, lights the fault indicator lamp 311, and simultaneously notifies the soft starter control device 1 of the occurrence of emergency braking through the communication bus 5; after receiving the emergency braking information from the motor controller 306, the softstarter control device 1 displays the relevant operating conditions on the display 104, and checks whether an operation request related to the motor controller 306 is being executed, and if so, immediately stops the operation request, and on the other hand, checks whether an operation request provided by the motor controller 306 exists in an operation request queue, and if so, deletes the operation request.
The current, voltage and temperature of the motor monitored by the current sensor 303, the voltage sensor 304 and the temperature sensor 305 are transmitted to the motor controller 306, and then the motor controller 306 transmits the data and the operation data of the motor to the soft starter control device 1 in real time through the communication bus 5; when faults such as overvoltage, overcurrent, phase loss, overheating and the like occur, the motor controller 306 sends a fault signal to the soft starter control device 1 and requests soft stop, after an instruction of the soft starter control device 1 is obtained, the motor controller 306 controls the corresponding alternating current contactor to act, so that the motor 4 enters a soft stop preparation state, sends a prepared signal to the soft starter control device 1, simultaneously closes the operation indicator lamp 309, and lights the soft stop indicator lamp 310 and the fault indicator lamp 311; after receiving the prepared signal, the soft starter control device 1 controls the soft starter to execute the soft stop operation, and simultaneously displays the fault information sent by the motor controller on a display; and on the one hand checks whether an operation request related to the motor controller 306 is being executed, continues if a soft stop operation is being executed, and immediately stops the operation request if a soft start operation is being executed, and on the other hand checks whether an operation request made by the motor controller 306 exists in an operation request queue, and deletes the operation request if the operation request exists; after the soft stop operation is completed, the soft starter control device 1 sends an operation request completion signal to the motor controller 306; upon receiving the operation request completion signal, the motor controller 306 turns off the soft stop lamp 310 that has been turned on, and simultaneously turns on the stop lamp 307.
The operation of the present invention will be described with reference to the following examples.
[ first embodiment ]
The method for operating and controlling by applying the technology of the invention is explained in detail now, knowing that 10 motors with different specifications from 15KW to 37KW in a certain workshop need to implement soft start and soft stop.
(1) Soft starter capacity selection: because the maximum power of the motor is 37KW, according to the use specification of the soft starter, the capacity of the soft starter is increased by one gear compared with the power of the motor and is 45KW.
(2) Construct the operation request:
step one, endowing each motor with a device number and a device weight: in the embodiment, 1 to 10 device weights are respectively given to each motor according to the importance degree of each motor in the whole system, and for the sake of simplicity, the device number of the motor is taken as the device weight of the motor;
secondly, endowing various operations with operation weights: in the embodiment, four types of operation requests, namely emergency stop, fault alarm, soft stop and soft start, are sequentially given different operation weights from 3 to 0, namely an emergency stop weight =3, a fault alarm weight =2, a soft stop weight =1 and a soft start weight =0;
thirdly, constructing an operation request: constructing an operation request comprising two parts, namely an execution weight and a device number; in the embodiment, the execution weight is composed of decimal 3 digits, wherein the hundred digits are operation weight, and the tens digit and the unit digit are device weights;
(3) formulating an ordering rule of the operation request queue: in the embodiment, queuing is performed in the operation request queue according to the execution weight of the operation request sent by each motor controller; for operation requests with different execution weights, last-in first-out with a large execution weight and first-in last-out with a small execution weight are executed; for operation requests with the same execution weight, the operation requests are first in, first out, last in and last out;
(4) soft start procedure:
firstly, a motor controller sends a soft start operation request to a soft starter control device to request to implement soft start;
secondly, after receiving the operation requests sent by each motor controller, the soft starter control device queues the operation requests in the operation request queue according to a preset sequencing rule, then sends a reply instruction to the motor controller which provides the operation request according to the operation request arranged at the first position, and simultaneously informs the soft starter of preparing for soft starting;
thirdly, after the motor controller receives a reply instruction of the soft starter control device, the motor controller controls the corresponding alternating current contactor to act, so that the motor is ready to enter soft start, the motor controller replies the ready soft starter control device, and meanwhile, a corresponding soft start indicator lamp is lightened;
fourthly, after receiving the prepared reply, the soft starter control device controls the soft starter to execute soft start according to the proposed soft start operation request; after the operation is finished, the soft starter control device sends a soft start operation finishing signal to the motor controller;
and fifthly, after receiving the operation request completion signal, the motor controller turns off the lighted soft start indicator lamp and lights the running indicator lamp at the same time.
(5) Soft stop procedure:
firstly, a motor controller sends a soft stop operation request to a soft starter control device to request to implement soft stop;
secondly, after receiving the operation requests sent by each motor controller, the soft starter control device queues the operation requests in the operation request queue according to a preset sequencing rule, then sends a reply instruction to the motor controller which provides the operation request according to the operation request arranged at the first position, and simultaneously informs the soft starter of making soft parking preparation;
thirdly, after the motor controller receives a reply instruction of the soft starter control device, the motor controller controls the corresponding alternating current contactor to act, so that the motor is ready to enter soft parking, the motor controller replies the ready soft starter control device, and meanwhile, the corresponding soft parking indicator lamp is lightened;
fourthly, after receiving the prepared reply, the control device of the soft starter controls the soft starter to execute soft parking according to the proposed soft parking operation request; after the operation is finished, the soft starter control device sends a soft stop operation finishing signal to the motor controller;
and fifthly, after receiving the operation request completion signal, the motor controller turns off the lightened soft stop indicator lamp and simultaneously turns on the stop indicator lamp.
(6) The fault handling process:
step one, when faults such as overvoltage, overcurrent, phase loss, overheating and the like occur, a motor controller sends a fault signal to a soft starter control device and requests soft stop;
after the instruction of the soft starter control device is obtained, the motor controller controls the corresponding alternating current contactor to act, so that the motor enters a soft parking preparation state, sends a preparation signal to the soft starter control device, simultaneously turns off the operation indicator lamp, and lights the soft parking indicator lamp and the fault indicator lamp;
thirdly, after receiving the prepared signal, the soft starter control device controls the soft starter to execute soft parking operation and simultaneously displays the fault information sent by the motor controller on a display; checking whether an operation request related to the motor controller is executed or not, if the operation request is executed, continuing, if the soft stop operation is executed, stopping the operation request immediately, if the soft start operation is executed, and checking whether an operation request queue has an operation request provided by the motor controller or not, and if the operation request queue has the operation request, deleting the operation request;
fourthly, after the soft parking operation is finished, the soft starter control device sends an operation request finishing signal to the motor controller;
fifthly, after receiving the operation request completion signal, the motor controller turns off the lightened soft stop indicator lamp and simultaneously lights the stop indicator lamp;
(7) emergency stop processing flow:
firstly, when an operator presses an emergency stop button, a motor controller immediately cuts off a working alternating current contactor A or a working alternating current contactor B, starts an emergency braking device to brake a motor, lights a fault indicator lamp, and simultaneously informs a soft starter control device of emergency braking through a communication bus;
and secondly, after receiving the emergency braking information sent by the motor controller, the soft starter control device displays the relevant working condition on a display, and on one hand, checks whether the operation request relevant to the motor controller is executed or not, and immediately stops the operation request if the operation request is executed, and on the other hand, checks whether the operation request is provided by the motor controller or not in an operation request queue, and if the operation request is provided, deletes the operation request.
[ second embodiment ]
It is known that 12 10KW motors and 6 15KW motors in a certain workshop need to implement soft start and soft stop, and it is known that each soft start or soft stop needs 1 minute, and the interval between two operations needs 10 seconds, and if the soft start or soft stop of all the motors needs to be completed within 6 minutes, please explain in detail the method for operating and controlling by applying the technology of the present invention.
(1) Soft starter capacity selection: according to known conditions, soft starting or soft stopping of 18 motors is finished within 6 minutes, and a plurality of motors are required to be simultaneously soft started or soft stopped each time; 12 KW motors with 10KW are divided into 3 groups and 4 groups, and simultaneously 6 KW motors with 15KW are divided into 2 groups, and soft starting or soft stopping can be completed within 6 minutes by dividing into 5 times of soft starting or soft stopping; the total power of 4 10KW motors is 40KW, the total power of 315 KW motors is 45KW, according to the operating instructions of the soft starter, the capacity of the soft starter should be increased by one gear compared with the power of the motors, and the power is 55KW in the embodiment example;
(2) construct the operation request:
step one, endowing each motor with a device number and a device weight: in the embodiment, the importance degree of each motor in the whole system is respectively given to the equipment weight of 1 to 18, and for the sake of simplicity, the equipment number of the motor is taken as the equipment weight of the motor;
secondly, endowing operation weights for various operations: in the embodiment, six types of operation requests, namely emergency stop, fault alarm, group soft stop, group soft start and soft start, are sequentially given with different operation weights from 5 to 0, namely, the emergency stop weight =5, the fault alarm weight =4, the soft stop weight =3, the soft stop weight =2, the soft start weight =1 and the soft start weight =0;
thirdly, constructing an operation request: constructing an operation request comprising two parts, namely an execution weight and a device number; in the embodiment, the execution weight is composed of decimal 3 digits, wherein the hundred digits are operation weight, and the tens digit and the unit digit are device weights; the equipment number is usually the equipment number of the motor which provides the operation request, but when a plurality of motors need to be simultaneously soft-started or soft-stopped, the equipment number contains the equipment numbers of all the motors, and the maximum equipment weight in the motors is taken as the equipment weight in the execution weight; when a soft starter control device detects that a plurality of motors (2-4 motors with the same power are provided with 10KW and 2-3 motors with the same power) in an operation request queue request the same operation, the operation requests can be integrated into a group operation request, the equipment number at the moment contains the equipment numbers of all the motors, and the maximum equipment weight in the motors is taken as the equipment weight in an execution weight, wherein the operation weight in the execution weight can be taken as the operation weight of group soft start and group soft stop and the operation weight of common soft start and soft stop; in this embodiment, the operation weight is taken as the operation weight of group soft start and group soft stop, which means that the corresponding operation will be executed prior to the normal soft start and soft stop operation; the operation weight value of the normal soft start and soft stop is the same as the operation request of the normal soft start and soft stop, and the queuing is carried out according to the weight value of the equipment;
(3) formulating an ordering rule of the operation request queue: in the embodiment, queuing is performed in the operation request queue according to the execution weight of the operation request sent by each motor controller; for operation requests with different execution weights, executing last-in first-out with a large execution weight, and executing first-in last-out with a small execution weight; for operation requests with the same execution weight, the operation requests are first in, first out, last in and last out;
(4) soft start procedure: the method is the same as the first implementation example, but the alternating current contactor JR of each group of the multiple motor control devices is simultaneously switched on each time during group soft start;
(5) soft stop procedure: as in the first embodiment, however, in the group soft parking, the ac contactor JL of each of the plurality of motor control devices is simultaneously turned off and the ac contactors JR of the plurality of motor control devices are simultaneously turned on.
Claims (3)
1. A device for soft starting and soft stopping of a plurality of motors comprises a soft starter control device, a soft starter, M motor control devices, a communication bus A between the soft starter control device and the soft starter, a communication bus B between the soft starter control device and the motor control device, a three-phase power line and an output three-phase power line of the soft starter; the soft starter control device is characterized in that the soft starter control device performs information interaction with the soft starter through a communication bus A; the soft starter control device carries out information interaction with the M motor control devices through a communication bus B; the three-phase power supply line is connected to the power input end of the soft starter, and the output three-phase power supply line and the three-phase power supply line of the soft starter are respectively connected to the two power input ends of the M motor control devices; output three-phase motor power lines of the motor control device are respectively connected to corresponding motors;
the process of soft starting the device for soft starting and soft stopping the plurality of motors specifically comprises the following steps:
(1-1) the motor controller transmitting a soft start operation request to the soft start control device to request implementation of the soft start; or the soft starter control device sends out a group soft start operation request;
(1-2) after receiving the operation requests sent by each motor controller or the group soft start operation requests sent by the soft starter control device, the soft starter control device queues the operation requests in the operation request queue according to a preset sequencing rule, then sends a reply instruction to the motor controller appointed by the operation request according to the operation request arranged at the first position, and simultaneously informs the soft starter of preparing soft start;
(1-3) after the motor controller receives a reply instruction of the soft starter control device, the motor controller controls the corresponding alternating current contactor to act, so that the motor is ready to enter soft start, the motor returns the ready state to the soft starter control device, and meanwhile, a corresponding soft start indicator lamp is lightened;
(1-4) after receiving the prepared reply, the soft starter control device controls the soft starter to execute soft start according to the proposed soft start operation request; after the operation is finished, the soft starter control device sends a soft start operation finishing signal to the motor controller;
(1-5) after receiving the operation request completion signal, the motor controller turns off the lighted soft start indicator lamp and lights the running indicator lamp at the same time;
the process of soft parking by the device for soft starting and soft stopping of the motors specifically comprises the following steps:
(2-1) the motor controller sends a soft stop operation request to the soft starter control device to request to implement soft stop; or the soft starter control device sends out a group soft parking operation request;
(2-2) after receiving the operation requests sent by each motor controller or the group soft parking operation requests sent by the soft starter control device, the soft starter control device queues the operation requests in the operation request queue according to a preset sequencing rule, then sends a reply instruction to the motor controller appointed by the operation request according to the operation request arranged at the first position, and simultaneously informs the soft starter of making soft parking preparation;
(2-3) after the motor controller receives a reply instruction of the soft starter control device, the motor controller controls the corresponding alternating current contactor to act, so that the motor is ready to enter soft parking, replies the ready soft starter control device, and simultaneously lights a corresponding soft parking indicator lamp;
(2-4) after receiving the prepared reply, the soft starter control device controls the soft starter to execute soft parking according to the proposed soft parking operation request; after the operation is finished, the soft starter control device sends a soft stop operation finishing signal to the motor controller;
(2-5) after the motor controller receives the operation request completion signal, turning off the lightened soft stop indicator lamp and lightening the stop indicator lamp at the same time;
the process of fault treatment of the device for soft starting and soft stopping of the motors specifically comprises the following steps:
(3-1) when faults such as overvoltage, overcurrent, phase loss, overheating and the like occur, the motor controller sends a fault signal to the soft starter control device and requests soft stop;
(3-2) after the instruction of the soft starter control device is obtained, the motor controller controls the corresponding alternating current contactor to act, so that the motor enters a soft parking preparation state, sends a prepared signal to the soft starter control device, and simultaneously turns off the operation indicator lamp and lights the soft parking indicator lamp and the fault indicator lamp;
(3-3) after the soft starter control device receives the prepared signal, controlling the soft starter to execute soft stop operation, and simultaneously displaying fault information sent by the motor controller on a display; checking whether an operation request related to the motor controller is being executed or not, if the operation request is being executed, continuing the operation, if the soft stop operation is being executed, immediately stopping the operation request, and if the operation request is being executed, checking whether an operation request provided by the motor controller exists in an operation request queue or not, and if the operation request exists, deleting the operation request;
(3-4) after the soft stop operation is finished, the soft starter control device sends an operation request completion signal to the motor controller;
(3-5) after receiving the operation request completion signal, the motor controller turns off the lightened soft stop indicator lamp and simultaneously lights the stop indicator lamp;
the process of carrying out emergency stop treatment on the device for soft starting and soft stopping of the motors specifically comprises the following steps:
(4-1) when an operator presses an emergency stop button, the motor controller immediately cuts off the working alternating current contactor A or alternating current contactor B, starts an emergency braking device to brake the motor, lights a fault indicator lamp, and simultaneously informs the soft starter control device of emergency braking through a communication bus B;
(4-2) after receiving the emergency braking information sent by the motor controller, the soft starter control device displays the relevant working condition on a display, and checks whether an operation request relevant to the motor controller is executed or not on one hand, and immediately stops the operation request if the operation request is executed or not on the other hand, checks whether an operation request made by the motor controller exists in an operation request queue or not, and deletes the operation request if the operation request exists.
2. The device for soft start and soft stop of a plurality of motors of claim 1, wherein the soft starter control device comprises a soft starter controller, a keyboard, a display and a printer; the output of the keyboard is connected to the soft starter controller; the output of the soft starter controller is connected to a display and a printer; the communication interface of the soft starter controller is respectively connected to the communication bus A, the communication bus B and the control center.
3. The device for soft starting and soft stopping of a plurality of motors as claimed in claim 1 or claim 2, wherein the motor control device comprises ac contactor a, ac contactor B, current sensor, voltage sensor, temperature sensor, motor controller, stop indicator, soft start indicator, operation indicator, soft stop indicator, fault indicator, start button, stop button, emergency brake device, and output three-phase motor power line; the motor controller carries out information interaction with the soft starter control device through a communication bus B; the output three-phase power line of the soft starter is connected to the input end of the alternating current contactor A, the three-phase power line is connected to the input end of the alternating current contactor B, and the output ends of all the alternating current contactors are connected to the motor through the output three-phase motor power line; the motor controller controls the on-off of the alternating current contactor A or the alternating current contactor B, when the motor runs, only one alternating current contactor is kept on, the motor is connected to a specified three-phase power line, and the other alternating current contactor is kept in a power-off state; the output ends of the current sensor, the voltage sensor and the temperature sensor are connected to the input end of the motor controller and are respectively used for monitoring the current, the voltage and the temperature of the motor; the output end of the motor controller is respectively connected to a parking indicator lamp, a soft start indicator lamp, an operation indicator lamp, a soft parking indicator lamp and a fault indicator lamp and is respectively used for indicating the operation state of the motor and giving a fault alarm; the start button, the stop button, and the emergency stop button are connected to an input of the motor controller, respectively.
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| CN202011021463.8A CN113364356B (en) | 2020-09-25 | 2020-09-25 | Soft start and soft stop device for multiple motors |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011021463.8A CN113364356B (en) | 2020-09-25 | 2020-09-25 | Soft start and soft stop device for multiple motors |
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| CN113364356B true CN113364356B (en) | 2022-10-25 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE4414984A1 (en) * | 1994-04-29 | 1995-11-02 | Rieter Ingolstadt Spinnerei | Soft start of the drive motors of a rotor spinning machine |
| CN101222192A (en) * | 2007-06-25 | 2008-07-16 | 刘群 | Low-voltage and high-voltage motor soft starter composed of three-phase commutation bridge |
| US10517286B2 (en) * | 2017-08-23 | 2019-12-31 | Lindsay Corporation | Soft start motor control system for an irrigation system |
| CN210536534U (en) * | 2019-08-07 | 2020-05-15 | 泰豪科技股份有限公司 | Soft starter one-to-many control circuit and system |
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