CN108448946B - Motor restart controller and control method of motor restart controller - Google Patents
Motor restart controller and control method of motor restart controller Download PDFInfo
- Publication number
- CN108448946B CN108448946B CN201810355877.0A CN201810355877A CN108448946B CN 108448946 B CN108448946 B CN 108448946B CN 201810355877 A CN201810355877 A CN 201810355877A CN 108448946 B CN108448946 B CN 108448946B
- Authority
- CN
- China
- Prior art keywords
- frequency converter
- module
- power supply
- reset
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims description 24
- 238000004891 communication Methods 0.000 claims description 11
- 230000003111 delayed effect Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010924 continuous production Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 101000581533 Homo sapiens Methylcrotonoyl-CoA carboxylase beta chain, mitochondrial Proteins 0.000 description 1
- 102100027320 Methylcrotonoyl-CoA carboxylase beta chain, mitochondrial Human genes 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
- H02P1/02—Details of starting control
- H02P1/029—Restarting, e.g. after power failure
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a motor restart controller and a control method thereof, which are used for controlling the restart of a motor through a frequency converter, wherein a backup power module is electrically connected with a logic control module and a reset module. The logic control module is used for judging whether an operation signal normally open contact of the frequency converter is disconnected or not after detecting that the instantaneous depression amplitude of the power supply voltage reaches a preset amplitude threshold value, and if so, locking a starting instruction of the frequency converter and detecting whether the power supply voltage is recovered or not; if the power supply voltage is not recovered when the preset time threshold is reached, disconnecting the backup power supply module from the reset module and removing a starting instruction of the frequency converter, otherwise, controlling the backup power supply module to supply power to the reset module and further controlling the frequency converter to reset. The controller can quickly respond and accurately judge whether the shutdown of the frequency converter is really caused by instantaneous 'power dazzling' of the power supply, so that the frequency converter is prevented from being started by mistake due to misjudgment, the continuous production operation is guaranteed, and safety accidents are reduced.
Description
Technical Field
The invention relates to the field of industrial control, in particular to a motor restart controller and a control method of the motor restart controller.
Background
With the increase of the looped network of the main network and the power supply line of the medium-voltage network of the enterprise, the enterprise is not provided with an impedance isolation element for reducing the power consumption, so that when the adjacent line in the main network or the medium-voltage network of the enterprise has a fault, instantaneous voltage loss or undervoltage (referred to as 'power interference') is inevitably caused, and the 'power interference' time depends on the cutting time of the fault of the adjacent line and is about less than 200 ms. For the release of the frequency converter caused by the 'voltage interference', the voltage acquisition refresh cycle time of the microprocessor is longer than the instantaneous power failure time (such as 200ms), and the conventional restarting equipment in the microprocessor mode cannot quickly capture the response to the instantaneous voltage change, so the 'voltage interference' cannot play a role in the instantaneous voltage loss of the power supply below 200 ms.
The frequency converter is generally applied to the field of industrial control, and has automatic resetting and restarting functions for some faults due to the perfect protection characteristic of the frequency converter, but frequency converter manufacturers give warning instructions for the use of the functions and do not suggest the use, so that a user needs to automatically undertake the danger of personal and safety possibly brought after the use, and the frequency converter does not automatically reset and restart after the faults are judged, and cannot reset and restart, so that the user needs to automatically judge and use, and the user is self-responsible.
Therefore, in the use of a daily frequency converter, for the problem of frequency converter low-voltage protection tripping caused by instantaneous 'power-shaking' of a power supply during the normal operation of a motor, under the normal condition, after the power supply is automatically recovered, the motor operation needs to be recovered by manual operation again, so that the unnecessary halt of the motor during the operation is caused, the production is interrupted, and great economic losses are caused to continuous production enterprises such as petroleum, petrochemical industry, chemical industry, electric power, metallurgy and the like, and even safety accidents are caused.
Disclosure of Invention
Therefore, the motor restart controller and the control method of the motor restart controller have the advantages that the instantaneous 'power-on-earth' of the power supply can be quickly responded, the 'power-on-earth' fault can be accurately identified, the frequency converter is restarted in time after the power supply is automatically recovered, and then the motor is restarted, so that the continuous operation of production is guaranteed.
A motor restart controller for controlling restart of a motor by a frequency converter, comprising: the device comprises a backup power module, a logic control module, a timing module and a reset module;
the backup power supply module is electrically connected with the logic control module and the reset module and used for supplying power to the motor restart controller when an external power supply is instantaneously in voltage loss or undervoltage according to a control instruction of the logic control module;
the reset module is electrically connected with the frequency converter and is used for controlling the frequency converter to reset;
the timing module is used for presetting a time threshold;
the logic control module is respectively and electrically connected with a live wire and a zero wire of the power supply and a pair of running signal normally open contacts of the frequency converter, and is used for acquiring the instantaneous depression amplitude of the power supply voltage and judging whether the instantaneous depression amplitude of the power supply voltage reaches a preset amplitude threshold value, if so, judging whether the running signal normally open contacts of the frequency converter are disconnected, and if judging that the running signal normally open contacts of the frequency converter are disconnected, locking a starting instruction of the frequency converter and detecting whether the power supply voltage is recovered; if the power voltage is not recovered when the preset time threshold value is reached, disconnecting the backup power module and the reset module and removing the starting instruction of the frequency converter, otherwise, controlling the backup power module to supply power to the reset module and further controlling the frequency converter to reset.
In one embodiment, the power supply system further comprises an output relay module, wherein the output relay module is electrically connected with the backup power module, the logic control module locks a starting instruction of the frequency converter, the logic control module controls the backup power module to supply power to the output relay module, and then the output relay module locks the starting instruction of the frequency converter.
In one embodiment, the system further comprises an online locking module, wherein the online locking module is electrically connected with the frequency converter and used for locking an operation signal of the frequency converter when the frequency converter operates.
In one embodiment, the system further comprises a communication module, and the communication module is used for carrying out network communication with the background.
In one embodiment, the output relay module includes an output relay, and the output contacts of the output relay operate in the following manner: and in the range of the preset time threshold, the valve is instantaneously closed and is delayed to be opened.
In one embodiment, the logic control module comprises: the device comprises a power supply voltage amplitude detection circuit, a frequency converter running state detection circuit, a logic judgment circuit and a backup power supply control circuit, wherein one end of the logic judgment circuit is electrically connected with the power supply voltage amplitude detection circuit and the frequency converter running state detection circuit respectively, and the other end of the logic judgment circuit is electrically connected with the backup power supply control circuit;
the power supply voltage amplitude detection circuit is electrically connected with a live wire and a zero line of the power supply, and is used for detecting the instantaneous depression amplitude of the power supply voltage and transmitting the instantaneous depression amplitude to the logic judgment circuit;
the frequency converter running state detection circuit is electrically connected with a pair of running signal normally open contacts of the frequency converter and is used for detecting the state of the running signal normally open contacts of the frequency converter and transmitting the state to the logic judgment circuit;
the logic judgment circuit is used for judging whether an operation signal normally open contact of the frequency converter is disconnected or not after detecting that the instantaneous depression amplitude of the power supply voltage reaches a preset amplitude threshold value, and if so, judging that the frequency converter is disconnected due to instantaneous voltage loss or undervoltage of the power supply;
and the backup power supply control circuit is used for controlling the backup power supply module to supply power or cut off power to the motor restart controller within the preset time threshold range when the power supply is instantaneously under voltage loss or undervoltage according to the control instruction of the logic control module.
In one embodiment, the power supply voltage amplitude detection circuit comprises a voltage relay and an auxiliary circuit thereof.
In one embodiment, the preset amplitude threshold is 45% -55% of the amplitude of the normal power supply voltage.
In one embodiment, the reset module comprises a reset relay, and a normally open output contact of the reset relay is connected with a reset terminal of the frequency converter in parallel.
On the other hand, the invention also provides a control method of the motor restart controller, which is used for controlling the restart of the motor through the frequency converter, wherein the motor restart controller comprises a backup power module, a logic control module, a timing module and a reset module; the backup power supply module is electrically connected with the logic control module and the reset module, the reset module is electrically connected with the frequency converter, the timing module is used for presetting a time threshold, and the method comprises the following steps:
the logic control module is respectively and electrically connected with a live wire and a zero wire of a power supply and a pair of running signal normally-open contacts of the frequency converter, and the logic control module acquires the instantaneous depression amplitude of the power supply voltage;
judging whether the instantaneous depression amplitude of the power supply voltage reaches a preset amplitude threshold value, if so, judging whether an operation signal normally open contact of the frequency converter is disconnected, and if so, locking a starting instruction of the frequency converter and detecting whether the power supply voltage is recovered; if the power voltage is not recovered when the preset time threshold value is reached, disconnecting the backup power module and the reset module and removing the starting instruction of the frequency converter, otherwise, controlling the backup power module to supply power to the reset module and further controlling the frequency converter to reset.
The motor restart controller comprises a backup power module, a logic control module, a timing module and a reset module, wherein the backup power module is used for supplying power to the motor restart controller within a preset time threshold range (the preset time is from starting timing to reaching the preset time threshold) according to a control instruction of the logic control module when an external power supply is instantaneously under voltage or under voltage. The logic control module is respectively electrically connected with a live wire, a zero line and a pair of running signal normally-open contacts of the frequency converter, and is used for judging whether the running signal normally-open contacts of the frequency converter are disconnected after the instantaneous depression amplitude of the power voltage reaches a preset amplitude threshold value, if so, locking a starting button of the frequency converter within a preset time threshold value range (the preset time reaches the preset time threshold value from the beginning of timing), and further locking a starting instruction of the frequency converter, so that the frequency converter can be started by calling. Meanwhile, the logic control module detects whether the power supply voltage is recovered within a preset time threshold range, if so, the logic control module controls the backup power supply module to supply power to the reset module, and the reset module sends a reset signal to the frequency converter so as to reset the frequency converter; if not, the connection between the backup power module and the reset module is disconnected and the starting instruction of the frequency converter is released. As the logic control module locks the starting instruction of the frequency converter, once the power supply voltage is recovered within the preset time threshold range, the frequency converter is immediately started after being reset, thereby driving the motor to restart. Therefore, if the frequency converter is stopped due to the instantaneous 'power-on-earth' of the power supply, the motor restart controller can quickly respond to the instantaneous 'power-on-earth' of the power supply and accurately judge whether the stop of the frequency converter is caused by the instantaneous 'power-on-earth' of the power supply, so that the false start of the frequency converter caused by the false judgment is prevented. If the frequency converter is stopped caused by the instantaneous 'electricity interference' of the power supply, the frequency converter is controlled to be restarted within the preset time threshold range so as to restart the motor, thereby ensuring the continuous production operation and reducing safety accidents.
Drawings
FIG. 1 is a block diagram of a motor restart controller in one embodiment;
FIG. 2 is an exemplary wiring schematic of the motor restart controller in one embodiment;
FIG. 3 is a flow chart of a control method of the motor restart controller in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
FIG. 1 is a block diagram of a motor restart controller in one embodiment.
In this embodiment, the motor restart controller is configured to control the restart of the motor by controlling the restart after the shutdown of the inverter, and the motor restart controller includes a backup power module 30, a logic control module 10, a timing module 20, and a reset module 50.
One end of the backup power module 30 is electrically connected to the logic control module 10, and the other end is electrically connected to the reset module 50, and is configured to supply power to the motor restart controller according to a control instruction of the logic control module 10 when the power supply is momentarily under-voltage or under-voltage.
The reset module 50 is electrically connected to the frequency converter and is used for controlling the frequency converter to reset.
The timing module 20 is used to preset a time threshold.
The logic control module 10 includes a pair of power terminals and a pair of input terminals, the pair of power terminals are electrically connected to the live line and the zero line of the power supply respectively, and the pair of input terminals are electrically connected to a pair of normally open contacts of the operating signal of the frequency converter respectively. The logic control module 10 is configured to obtain an instantaneous sag amplitude of the power supply voltage, determine whether the instantaneous sag amplitude of the power supply voltage has reached a preset amplitude threshold, determine whether an operation signal normally-open contact of the frequency converter is disconnected if the instantaneous sag amplitude of the power supply voltage has reached the preset amplitude threshold, enter a power-shaking protection operating state if the operation signal normally-open contact of the frequency converter is determined to be disconnected, and lock a start button of the frequency converter by the logic control module 10 within a preset time threshold range, so as to lock a start instruction of the frequency converter, so that the frequency converter can be started immediately by a power supply; if not, the interference protection working state is not entered, and the connection between the backup power supply module 30 and the reset module 50 is disconnected. Meanwhile, the logic control module 10 detects whether the power supply voltage is recovered within a preset time threshold range, if the power supply voltage is not recovered when the preset time threshold is reached, the connection between the backup power supply module 30 and the reset module 50 is automatically disconnected, a starting instruction of the frequency converter is released, the frequency converter is shut down, the frequency converter can be manually restarted after an operator gets rid of a fault, and otherwise, the backup power supply module 30 is controlled to supply power to the reset module 50, and the frequency converter is controlled to reset. Within the preset time threshold range, the logic control module 10 locks the start instruction of the frequency converter, so that once the power supply voltage is recovered, the frequency converter is immediately started after being reset, and the motor is driven to restart.
The motor restart controller comprises a backup power module 30, a logic control module 10, a timing module 20 and a reset module 50, wherein the backup power module 30 is used for supplying power to the motor restart controller within a preset time threshold range when an external power supply is instantaneously under-voltage or under-voltage according to a control instruction of the logic control module 10. The logic control module 10 is electrically connected to the live wire and the zero line of the power supply and a pair of normally open contacts of the operating signal of the frequency converter respectively, and is used for judging whether the normally open contacts of the operating signal of the frequency converter are disconnected after the instantaneous depression amplitude of the detected power supply voltage reaches a preset amplitude threshold value, if so, locking a start button of the frequency converter within a preset time threshold value range, and further locking a start instruction of the frequency converter to enable the frequency converter to be started by calling. Meanwhile, the logic control module 10 detects whether the power supply voltage is recovered within a preset time threshold range, if so, the backup power supply module 30 is controlled to supply power to the reset module 50, and the reset module 50 sends a reset signal to the frequency converter so as to reset the frequency converter; if not, the connection between the backup power module 30 and the reset module 50 is disconnected, and the starting instruction of the frequency converter is released. Since the logic control module 10 locks the start instruction of the frequency converter, once the power supply voltage is recovered within the preset time threshold range, the frequency converter is immediately started after being reset, so as to drive the motor to restart. Therefore, if the frequency converter is stopped due to the instantaneous 'power-on-earth' of the power supply, the motor restart controller can quickly respond to the instantaneous 'power-on-earth' of the power supply and accurately judge whether the stop of the frequency converter is caused by the instantaneous 'power-on-earth' of the power supply, so that the false start of the frequency converter caused by the false judgment is prevented. If the frequency converter is actually stopped due to the instantaneous 'power-off' of the power supply, the frequency converter is controlled to be restarted within the preset time threshold range, so that the continuous operation of production is guaranteed, and if the frequency converter is not stopped due to the instantaneous 'power-off' of the power supply, the frequency converter is controlled not to be restarted, so that safety accidents are reduced.
In one embodiment, the motor restart controller includes an output relay module 40, the output relay module 40 is electrically connected to the backup power module 30, and the start instruction for locking the frequency converter by the logic control module 10 is the start instruction for controlling the backup power module 30 to supply power to the output relay module 40 and locking the frequency converter after the output relay module 40 is powered on by the logic control module 10 within a preset time threshold.
In one embodiment, the timing module 20 is electrically connected to the logic control module 10 at one end and electrically connected to the backup power module 30 at the other end, and is configured to control the backup power module 30 to supply power to or cut off power from the motor restart controller according to a control command of the logic control module 10.
In one embodiment, the timing module 20 is electrically connected to the logic control module 10, the timing module 20 is configured to provide a preset time threshold value to the logic control module 10, and the logic control module 10 controls the backup power module 30 to supply power to or cut off power from the motor restart controller within the preset time threshold value.
In one embodiment, the motor restart controller further includes an online locking module (not shown) electrically connected to the operation signal terminal of the frequency converter, for locking the operation signal of the frequency converter when the frequency converter is operating, and ensuring that the operation signal of the frequency converter is still in an online mode in the power-dazzling protection operating state, so as to create a condition for restarting after power restoration.
In one embodiment, the motor restart controller further comprises a communication module (not shown) for network communication with the background. In one embodiment, network communication is performed with the background through an RJ485 port.
In one embodiment, the motor restart controller further comprises an intermediate relay module (not shown), and the logic control module 10 further controls the backup power module 30 by controlling the intermediate relay module.
In one embodiment, the output relay module 40 includes an output relay, and the output contacts of the output relay operate in the following manner: and in the range of a preset time threshold, the valve is instantaneously closed and is delayed to be opened.
In one embodiment, the reset module 50 includes a reset relay having a normally open output contact connected in parallel with the reset terminal of the frequency converter. In one embodiment, the reset relay sends a pulse reset signal to the reset terminal of the frequency converter when the reset relay is powered on, so that the frequency converter is reset.
In one embodiment, the timing module 20 includes a time relay circuit that at least solidifies at factory or solidifies through a digital display device a time parameter, the time parameter including a preset time threshold.
In one embodiment, the logic control module 10 includes: the device comprises a power supply voltage amplitude detection circuit, a frequency converter running state detection circuit, a logic judgment circuit and a backup power supply control circuit, wherein one end of the logic judgment circuit is electrically connected with the power supply voltage amplitude detection circuit and the frequency converter running state detection circuit respectively, and the other end of the logic judgment circuit is electrically connected with the backup power supply control circuit;
the power supply voltage amplitude detection circuit is electrically connected with a live wire and a zero line of a power supply, and is used for detecting the instantaneous concave amplitude of the power supply voltage and transmitting the instantaneous concave amplitude to the logic judgment circuit;
the frequency converter running state detection circuit is electrically connected with a pair of running signal normally open contacts of the frequency converter and is used for detecting the state of the running signal normally open contacts of the frequency converter in real time and transmitting the state to the logic judgment circuit;
the logic judgment circuit is used for judging whether the instantaneous depression amplitude of the power supply voltage reaches a preset amplitude threshold value, if so, judging whether an operation signal normally open contact of the frequency converter is disconnected: if the controller is in the working state, the controller is started again to start the motor, and the controller is in the working state of the power-shaking protection.
The backup power supply control circuit is used for controlling the backup power supply module 30 to supply power or cut off power to the motor restarting controller within a preset time threshold range when the power supply is instantaneously under voltage or undervoltage according to the control instruction of the logic control module.
In one embodiment, the supply voltage magnitude detection circuit includes a voltage relay and its auxiliary circuits.
In one embodiment, the power supply voltage amplitude detection circuit is further configured to detect an instantaneous variation of the power supply voltage sag amplitude, and the logic determination circuit is configured to determine whether the normally open contact of the operation signal of the frequency converter detected by the frequency converter operation state detection circuit is open or not according to that the instantaneous variation of the power supply voltage sag amplitude has reached a preset slope threshold and occurs before the instantaneous sag amplitude reaches the preset amplitude threshold, and if so, determine that the frequency converter is disconnected due to instantaneous voltage loss or undervoltage of the power supply.
In one embodiment, the preset amplitude threshold is 45% -55% of the amplitude of the normal power supply voltage, and the preset slope threshold is 10-20%.
In one embodiment, the backup power module 30 incorporates a super capacitor, which has an ultra-long service life.
FIG. 2 is an exemplary wiring schematic of the motor restart controller in one embodiment.
In this embodiment, three-phase coils L1, L2, L3, three-phase circuit breaker MCCB, Fuse, inverter VVVF and motor M form a main circuit, motor restart controller DZQ-B5X/L connects in parallel the control circuit of the inverter, and the motor restart controller includes a plurality of contacts.
1 st and 2 nd junctions: the 1 st contact is connected with the live wire L of the control power supply and is used as the input power supply of DZQ-B, the 2 nd contact is connected with the zero wire, and the 2 nd contact is reliably grounded in consideration of the protection of electronic devices. The pair of contact points are also detection points for detecting the change of the power supply voltage, and the instantaneous concave amplitude of the power supply voltage is collected and detected.
Contact 3 and contact 4: the controller is characterized by comprising a pair of input terminals of a logic control module of the motor restart controller, an input contact for detecting the running state of a frequency converter, a pair of running signal normally-open contacts of a running instruction relay KM connected into the frequency converter, a 1 st contact and a 2 nd contact have standard working power supply input, after the frequency converter starts to run, the running instruction relay KM of the frequency converter is electrified and attracted, then a pair of running signal normally-open contacts of the running instruction relay KM connected with a 3 rd contact and a 4 th contact are closed, the power supply in the motor restart controller is switched on, and the situation that the running instruction relay KM of the frequency converter is in an attraction state and the motor runs normally is indicated. When the 3 rd contact and the 4 th contact are disconnected, it is judged that a pair of operation signals of the operation command relay KM of the frequency converter connected with the 3 rd contact and the 4 th contact are normally opened, and the frequency converter is stopped. The logic control module further judges whether the shutdown of the frequency converter is caused by the instantaneous 'power-on-earth' of the power supply. If the frequency converter is judged to be shut down due to power supply 'power interference', the motor restart controller enters a power interference protection working state, and controls the back-up power supply module to supply power to the output relay module within a preset time threshold range, so that a starting instruction of the frequency converter is locked. If the frequency converter is judged not to be shut down due to power supply 'power interference', the motor restart controller does not enter the power interference protection working state, and the connection between the backup power supply module and the output relay module is disconnected.
5 th and 6 th junctions: the normally open output contact of the output relay module of the motor restart controller is connected in parallel with two ends of a start button of the frequency converter. If the frequency converter is shut down due to the power supply interference, the backup power module supplies power to the output relay module within the preset time threshold range, and after the output relay module is powered on, the 5 th contact and the 6 th contact are immediately closed, so that a starting instruction of the frequency converter is locked, and the frequency converter is restarted after the interference is finished. In other embodiments, there may be multiple pairs of latching contacts.
7 th and 8 th junctions: the normally open output contact of the reset module of the motor restart controller is connected in parallel with two ends of the reset terminal of the frequency converter. Within the range of the preset time threshold value, the logic control module detects that the power supply voltage is recovered within the range of the preset time threshold value, then the backup power supply module is controlled to supply power for the reset module, the 7 th contact and the 8 th contact of the reset module are powered on and closed, the low-voltage fault of the frequency converter is remotely reset, meanwhile, due to the fact that the 5 th contact and the 6 th contact are powered on and closed in a time-limited mode, the frequency converter is automatically recovered to operate, the normal working state is entered again, and therefore the motor is driven to be restarted and enters the normal working state. In one embodiment, the reset module sends a reset pulse signal to remotely reset the low-voltage fault of the frequency converter, and the number of the reset pulse signals can be one or more. In other embodiments, there may be multiple pairs of reset contacts.
11 th and 12 th junctions: the normally open output contact of the online locking module of the motor restart controller is connected in parallel with two ends of an operation signal terminal of the frequency converter, so that the operation signal of the frequency converter is ensured to be still in an online mode under the working state of power failure protection, and conditions are created for restarting the frequency converter after the power supply is recovered.
13 th and 14 th junctions: the normally open output contact of the motor restart controller is connected in parallel with two ends of an operation signal terminal of the frequency converter, and the operation signal sent to the background by the frequency converter is locked on line, so that the operation signal of the frequency converter is ensured to be still in an on-line mode under the working state of the power-shaking protection, the background is ensured not to send out a chain vehicle-skipping instruction, and conditions are created for restarting the frequency converter after the power supply is recovered.
15 th and 16 th junctions: the communication terminal is used for carrying out network communication with a background. In one embodiment, the interface of the communication terminal is an RJ485 interface.
The working process is as follows: the 1 st contact and the 2 nd contact have standard working power supply input, and the converter starts the operation back, and the operation signal of the operation instruction relay KM of a pair of converter that 3 rd contact and 4 th contact access normally open the contact closed, and the 5 th contact and the 6 th contact that connect in parallel at the start instruction both ends of converter this moment are normally open state, do not have the closure. The 7 th contact and the 8 th contact are normally open and not closed. The 11 th contact and the 12 th contact, the 13 th contact and the 14 th contact which are connected in parallel with the operation signal terminal of the frequency converter and are transmitted to the background are closed in a delayed mode.
When the standard working power supply generates instantaneous depression or temporary drop (namely 'power loss'), and the depression amplitude reaches a preset amplitude threshold value, the frequency converter is protected to stop, and the 3 rd contact and the 4 th contact are disconnected. If the logic control module judges that the frequency converter is shut down due to power supply interference, the motor restart controller enters an interference protection working state, the backup power module is controlled within a preset time threshold value range to supply power to the output relay module, after the output relay module is powered on, the 5 th contact and the 6 th contact are immediately closed, so that a starting instruction of the frequency converter is locked, meanwhile, the 11 th contact and the 12 th contact, and the 13 th contact and the 14 th contact are still in a closed state, the running signal of the frequency converter is still in an online mode, and a background cannot send out a chain jump instruction, so that conditions are created for restarting after the power supply is recovered. If the logic control module judges that the frequency converter is not stopped caused by the power supply interference electricity, for example, the frequency converter is stopped caused by normal stop or other faults, the motor restart controller cannot enter a interference electricity protection working state, the connection among the backup power supply module, the output relay module and the reset module is disconnected, the 5 th contact and the 6 th contact are still in a normally open state and are not closed, the 7 th contact and the 8 th contact are still in the normally open state, and the 11-12 contacts and the 13-14 contacts are immediately disconnected, so that the frequency converter is not stopped caused by normal stop or other faults.
Within the range of the preset time threshold value, the logic control module detects that the power supply voltage is recovered to the normal working voltage, the backup power supply module is controlled to supply power to the reset module, the 7 th contact and the 8 th contact of the reset module are powered on and closed, the low-voltage fault of the frequency converter is remotely reset, meanwhile, the 5 th contact and the 6 th contact are powered on and closed to enable the starting loop of the frequency converter to be automatically switched on in a time-limited mode, the running instruction relay KM of the frequency converter is powered on and sucked, the frequency converter automatically recovers to run and enters the normal working state again, and therefore the motor is driven to be restarted and enters the normal working.
Within the range of the preset time threshold, if the logic control module detects that the power supply voltage is not recovered to the normal working voltage, the backup power supply module is automatically disconnected and does not supply power to other modules any more, the 5 th contact and the 6 th contact are disconnected in a delayed mode, the 7 th contact and the 8 th contact are automatically released and cannot be output any more, the 11 th contact and the 12 th contact, the 13 th contact and the 14 th contact are also disconnected in a delayed mode, and the motor restart controller is in a closed state. The voltage-interference protection state is automatically released, and the power supply voltage can not act if the power supply voltage is restored to the normal working voltage later.
Therefore, if the frequency converter is stopped due to the instantaneous 'power-on-earth' of the power supply, the motor restart controller can quickly respond to the instantaneous 'power-on-earth' of the power supply and accurately judge whether the stop of the frequency converter is caused by the instantaneous 'power-on-earth' of the power supply, so that the false start of the frequency converter caused by the false judgment is prevented. If the frequency converter is actually stopped due to the instantaneous 'power-off' of the power supply, the frequency converter is controlled to be restarted within the preset time threshold range, so that the continuous operation of production is guaranteed, and if the frequency converter is not stopped due to the instantaneous 'power-off' of the power supply, the frequency converter is controlled not to be restarted, so that safety accidents are reduced.
On the other hand, the invention also provides a control method of the motor restart controller, which is used for controlling the restart of the motor by controlling the restart after the frequency converter is stopped, and the motor restart controller comprises a backup power module 30, a logic control module 10, a timing module 20 and a reset module 50. One end of the backup power module 30 is electrically connected to the logic control module 10, and the other end is electrically connected to the reset module 50, and is configured to supply power to the motor restart controller according to a control instruction of the logic control module 10 when an external power supply is momentarily under-voltage or under-voltage. The reset module 50 is electrically connected to the frequency converter and is used for controlling the frequency converter to reset. The timing module 20 is used to preset a time threshold. The logic control module 10 is electrically connected to the live wire and the zero wire of the power supply and a pair of normally open contacts of the operating signal of the frequency converter respectively.
Referring to fig. 1, in the present embodiment, a control method of the motor restart controller includes:
s100, the logic control module obtains the instantaneous depression amplitude of the power voltage.
S200, judging whether the instantaneous depression amplitude reaches a preset amplitude threshold value.
The logic control module 10 determines whether the instantaneous sag amplitude of the power voltage has reached the preset amplitude threshold, and if the instantaneous sag amplitude has reached the preset amplitude threshold, the process proceeds to step S300.
And S300, judging whether the normally open contact of the operation signal of the frequency converter is disconnected.
The logic control module 10 is configured to determine whether the operation signal normally open contact of the frequency converter is disconnected after detecting that the instantaneous depression amplitude of the power supply voltage reaches a preset amplitude threshold, and if the operation signal normally open contact of the frequency converter is disconnected, the motor restart controller enters a power-shaking protection operating state, and then step S400 is performed, otherwise, the motor restart controller does not enter the power-shaking protection operating state.
S400, locking a starting instruction of the frequency converter and detecting whether the power supply voltage is recovered within a preset time threshold range.
Within the range of the preset time threshold, the logic control module 10 locks the start button of the frequency converter, so as to lock the start instruction of the frequency converter, and the frequency converter can be started immediately by calling. Meanwhile, the logic control module 10 detects whether the power supply voltage is recovered within a preset time threshold range, if the power supply voltage is recovered to the normal voltage within the preset time threshold range, the backup power supply module 30 is controlled to supply power to the reset module 50, the reset module 50 sends a reset signal to the frequency converter, the frequency converter is reset, and the logic control module 10 locks a starting instruction of the frequency converter, so that once the power supply voltage is recovered within the preset time threshold range, the frequency converter is immediately started after being reset, and the motor is driven to be restarted. If the power supply voltage does not recover to the normal voltage within the preset time threshold range (i.e. the power supply voltage does not recover to the normal voltage when the preset time threshold is reached), the connection between the backup power supply module 30 and the reset module 50 is automatically disconnected, the start instruction of the frequency converter locked before is released, the frequency converter is stopped, and the frequency converter can be manually restarted after the operator gets rid of the fault.
In one embodiment, before the step of determining whether the instantaneous recess amplitude of the power supply voltage has reached the preset amplitude threshold, the method further includes:
and before the instantaneous depression amplitude reaches a preset amplitude threshold, judging whether the instantaneous variation of the power supply voltage amplitude reaches a preset slope threshold.
Therefore, the control method of the motor restart controller can quickly respond to the instantaneous 'power-on-rush' of the power supply and accurately judge whether the shutdown of the frequency converter is really caused by the instantaneous 'power-on-rush' of the power supply. After the normally open contact of running signal of converter breaks off, only the converter stops because of the instantaneous "electric shock" of power, and under the condition that mains voltage recovered normal voltage in presetting the time threshold value within range, just control restart the converter and then restart the motor, the converter mistake that prevents to judge and cause starts, guarantee production continuous operation. If the frequency converter is not stopped due to instantaneous 'electricity dazzling' of the power supply, the frequency converter cannot be restarted under control, and therefore safety accidents are reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A motor restart controller for controlling restart of a motor by a frequency converter, comprising: the device comprises a backup power module, a logic control module, a timing module and a reset module;
the backup power supply module is electrically connected with the logic control module and the reset module and used for supplying power to the motor restart controller when an external power supply is instantaneously in voltage loss or undervoltage according to a control instruction of the logic control module;
the reset module is electrically connected with the frequency converter and is used for controlling the frequency converter to reset;
the timing module is used for presetting a time threshold;
the online locking module is electrically connected with the frequency converter and used for locking the running signal of the frequency converter when the frequency converter runs and ensuring that the running signal of the frequency converter is still in an online mode under the working state of interference protection;
the logic control module is respectively and electrically connected with a live wire and a zero wire of the power supply and a pair of running signal normally open contacts of the frequency converter, and is used for acquiring the instantaneous depression amplitude of the power supply voltage and judging whether the instantaneous depression amplitude of the power supply voltage reaches a preset amplitude threshold value, if so, judging whether the running signal normally open contacts of the frequency converter are disconnected, and if judging that the running signal normally open contacts of the frequency converter are disconnected, locking a starting instruction of the frequency converter and detecting whether the power supply voltage is recovered; if the power voltage is not recovered when the preset time threshold value is reached, disconnecting the backup power module and the reset module and removing the starting instruction of the frequency converter, otherwise, controlling the backup power module to supply power to the reset module and further controlling the frequency converter to reset.
2. The motor restart controller of claim 1, further comprising an output relay module electrically connected to the backup power module, wherein the logic control module latches the start command of the inverter, and the logic control module controls the backup power module to supply power to the output relay module, and then the output relay module latches the start command of the inverter.
3. The motor restart controller of claim 1, wherein the backup power module has a super capacitor built therein.
4. The motor restart controller of claim 1, further comprising a communication module for network communication with a background.
5. The motor restart controller of claim 2, wherein the output relay module comprises an output relay, and output contacts of the output relay operate in a manner that: and in the range of the preset time threshold, the valve is instantaneously closed and is delayed to be opened.
6. The motor restart controller of claim 1, wherein the logic control module comprises: the device comprises a power supply voltage amplitude detection circuit, a frequency converter running state detection circuit, a logic judgment circuit and a backup power supply control circuit, wherein one end of the logic judgment circuit is electrically connected with the power supply voltage amplitude detection circuit and the frequency converter running state detection circuit respectively, and the other end of the logic judgment circuit is electrically connected with the backup power supply control circuit;
the power supply voltage amplitude detection circuit is electrically connected with a live wire and a zero line of the power supply, and is used for detecting the instantaneous depression amplitude of the power supply voltage and transmitting the instantaneous depression amplitude to the logic judgment circuit;
the frequency converter running state detection circuit is electrically connected with a pair of running signal normally open contacts of the frequency converter and is used for detecting the state of the running signal normally open contacts of the frequency converter and transmitting the state to the logic judgment circuit;
the logic judgment circuit is used for judging whether an operation signal normally open contact of the frequency converter is disconnected or not after detecting that the instantaneous depression amplitude of the power supply voltage reaches a preset amplitude threshold value, and if so, judging that the frequency converter is disconnected due to instantaneous voltage loss or undervoltage of the power supply;
and the backup power supply control circuit is used for controlling the backup power supply module to supply power or cut off power to the motor restart controller within the preset time threshold range when the power supply is instantaneously under voltage loss or undervoltage according to the control instruction of the logic control module.
7. The motor restart controller of claim 6, wherein the power supply voltage amplitude detection circuit includes a voltage relay and its auxiliary circuit.
8. The motor restart controller of claim 1, wherein the preset amplitude threshold is 45% to 55% of the normal power supply voltage amplitude.
9. The motor restart controller of claim 1, wherein the reset module comprises a reset relay, and a normally open output contact of the reset relay is connected in parallel with a reset terminal of the inverter.
10. A control method of a motor restart controller is used for controlling the restart of a motor through a frequency converter, and is characterized in that the motor restart controller comprises a backup power module, a logic control module, a timing module and a reset module; the backup power supply module is electrically connected with the logic control module, the reset module and the online locking module, the reset module is electrically connected with the frequency converter, the timing module is used for presetting a time threshold value, the online locking module is electrically connected with the frequency converter and is used for locking an operation signal of the frequency converter when the frequency converter operates, and the operation signal of the frequency converter is ensured to be still in an online mode under the working state of interference protection; the method comprises the following steps:
the logic control module is respectively and electrically connected with a live wire and a zero wire of a power supply and a pair of running signal normally-open contacts of the frequency converter, and the logic control module acquires the instantaneous depression amplitude of the power supply voltage;
judging whether the instantaneous depression amplitude of the power supply voltage reaches a preset amplitude threshold value, if so, judging whether an operation signal normally open contact of the frequency converter is disconnected, and if so, locking a starting instruction of the frequency converter and detecting whether the power supply voltage is recovered; if the power voltage is not recovered when the preset time threshold value is reached, disconnecting the backup power module and the reset module and removing the starting instruction of the frequency converter, otherwise, controlling the backup power module to supply power to the reset module and further controlling the frequency converter to reset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810355877.0A CN108448946B (en) | 2018-04-19 | 2018-04-19 | Motor restart controller and control method of motor restart controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810355877.0A CN108448946B (en) | 2018-04-19 | 2018-04-19 | Motor restart controller and control method of motor restart controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108448946A CN108448946A (en) | 2018-08-24 |
| CN108448946B true CN108448946B (en) | 2021-06-15 |
Family
ID=63200288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810355877.0A Active CN108448946B (en) | 2018-04-19 | 2018-04-19 | Motor restart controller and control method of motor restart controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108448946B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109889104A (en) * | 2019-04-25 | 2019-06-14 | 高松锋 | Voltage shock avoiding soft starter device |
| CN110995061B (en) * | 2019-11-22 | 2022-09-27 | 中国核电工程有限公司 | Linkage control method for realizing automatic starting of power-off and power-on of motor equipment |
| CN110912391B (en) * | 2019-12-03 | 2023-09-12 | 深圳市倍通控制技术有限公司 | Restarting method and restarting device for frequency converter |
| CN112350888B (en) * | 2020-10-23 | 2022-10-11 | 英业达科技有限公司 | Startup state detection system and method thereof |
| CN114448076B (en) * | 2020-11-03 | 2024-08-27 | 中科华安科技(淄博)有限公司 | Motor protection device |
| CN112701964A (en) * | 2020-12-23 | 2021-04-23 | 程涛 | Restarting controller for motor |
| CN113364354B (en) * | 2021-06-05 | 2022-06-14 | 深圳市倍通控制技术有限公司 | Motor restart control method and controller thereof |
| CN113464481A (en) * | 2021-08-23 | 2021-10-01 | 小熊电器股份有限公司 | Desktop fan, and power-off protection control method and device for desktop fan |
| CN113852303B (en) * | 2021-09-27 | 2022-08-23 | 深圳市倍通控制技术有限公司 | Motor restart controller and control method of motor restart controller |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842887A (en) * | 2011-06-20 | 2012-12-26 | 上海宝钢化工有限公司 | Anti-interference electricity protection method and anti-interference electricity protection device for electric equipment |
| CN202872724U (en) * | 2012-09-10 | 2013-04-10 | 深圳市亚特尔科技有限公司 | A voltage fluctuation restart control device used for a frequency converter |
| CN103916053A (en) * | 2014-04-18 | 2014-07-09 | 深圳市倍通控制技术有限公司 | Motor restarting controller |
| CN203813698U (en) * | 2014-04-18 | 2014-09-03 | 深圳市倍通控制技术有限公司 | Restart controller of motor |
| CN203813699U (en) * | 2014-04-18 | 2014-09-03 | 深圳市倍通控制技术有限公司 | Motor restart controller for contactor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06249483A (en) * | 1993-02-26 | 1994-09-06 | Fuji Electric Co Ltd | Preventing simultaneous activation of multiple air conditioners |
| CN203589678U (en) * | 2013-12-05 | 2014-05-07 | 深圳市倍通控制技术有限公司 | Restart controller after instantaneous power failure |
| CN103972980A (en) * | 2014-04-18 | 2014-08-06 | 安徽金捷光电科技有限公司 | Anti-electricity-dazzling fast switching device |
| CN204068192U (en) * | 2014-07-08 | 2014-12-31 | 深圳市谊通华冠科技有限公司 | Motor anti-shake electric restart controller |
| CN204706867U (en) * | 2015-05-29 | 2015-10-14 | 山西际安电气有限公司 | A kind of protection system of mine-used frequency-converter |
-
2018
- 2018-04-19 CN CN201810355877.0A patent/CN108448946B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842887A (en) * | 2011-06-20 | 2012-12-26 | 上海宝钢化工有限公司 | Anti-interference electricity protection method and anti-interference electricity protection device for electric equipment |
| CN202872724U (en) * | 2012-09-10 | 2013-04-10 | 深圳市亚特尔科技有限公司 | A voltage fluctuation restart control device used for a frequency converter |
| CN103916053A (en) * | 2014-04-18 | 2014-07-09 | 深圳市倍通控制技术有限公司 | Motor restarting controller |
| CN203813698U (en) * | 2014-04-18 | 2014-09-03 | 深圳市倍通控制技术有限公司 | Restart controller of motor |
| CN203813699U (en) * | 2014-04-18 | 2014-09-03 | 深圳市倍通控制技术有限公司 | Motor restart controller for contactor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108448946A (en) | 2018-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108448946B (en) | Motor restart controller and control method of motor restart controller | |
| WO2015158218A1 (en) | Motor restarting controller | |
| CN109782657B (en) | Circuit breaker divide-shut brake integrated control system | |
| CN209313422U (en) | A kind of variable-frequency motor cooling control system | |
| CN201656420U (en) | Three-phase auto reclosing electricity leakage protection switch | |
| EP3021052A1 (en) | Air conditioner | |
| CN102263645A (en) | Power management method and power management system for communication equipment | |
| CN111880084A (en) | Residual current protection uninterruptible power test method and device and residual current protection device | |
| CN203813698U (en) | Restart controller of motor | |
| CN110912391B (en) | Restarting method and restarting device for frequency converter | |
| RU2323511C1 (en) | Automatic reclosing device in particular for controlling zero-sequence current of switches | |
| CN109193583B (en) | Control circuit for self-adaptive switching of inner bridge connection short lead protection | |
| CN103856338A (en) | Automatic bypass device and method for tandem connection of communication device | |
| CN111929614B (en) | Device and method for realizing full self-checking function of leakage protection | |
| CN111338258B (en) | Control circuit and control method when power supply voltage of low voltage AC control loop is abnormal | |
| CN113364354B (en) | Motor restart control method and controller thereof | |
| CN104076209A (en) | Motor detection device | |
| CN112701964A (en) | Restarting controller for motor | |
| CN102832798A (en) | Powering buffering control circuit and control method thereof | |
| CN204131095U (en) | The anti-shake electric installation of low voltage frequency converter | |
| JPH08289563A (en) | System interconnection power supply | |
| CN221120257U (en) | Temperature standby control system | |
| CN105471095A (en) | Low-voltage AC looped network loop power supply monitoring method | |
| TWI812416B (en) | An automatic sequence tripping and reclosing device | |
| JP2005124279A (en) | Self-sustained operation protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |