CN114295907B - Frequency converter charge and discharge comprehensive test equipment and method - Google Patents
Frequency converter charge and discharge comprehensive test equipment and method Download PDFInfo
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Abstract
The invention relates to a device and a method for comprehensively testing charge and discharge of a frequency converter, and belongs to the technical field of frequency converter maintenance devices and methods. The technical scheme of the invention is as follows: providing an adjustable power supply, and independently detecting the performances of all circuit boards in the frequency converter, so as to avoid damaging other components when testing on equipment; the charging and discharging functions are realized, the charging and discharging of all the frequency converter modules and the circuit board are realized, and the situation that the capacitor is overdischarged for too long storage time and the frying machine is generated during power-on is avoided; the device has an automatic voltage stabilizing function, a control function, a display function of the device and an operation console interface. The beneficial effects of the invention are as follows: the requirements of comprehensively checking the working performance of devices in frequency converters of various brands and models are met, the requirements of charging and discharging the capacitors of the frequency converters of various types are met, and a safer maintenance environment is established.
Description
Technical Field
The invention relates to a device and a method for comprehensively testing charge and discharge of a frequency converter, and belongs to the technical field of frequency converter maintenance devices and methods.
Background
The frequency converter mainly changes the frequency and amplitude of the power supply of the alternating current motor, so that the period of the moving magnetic field is changed, the power of the motor is adjusted, the rotating speed of the motor is smoothly controlled, and the purpose of saving electricity is achieved. Because the production environment is bad and the service life is increased, various fault problems can occur in the frequency converter in daily production, the frequency converter frequently used comprises a plurality of brands and series of frequency converters such as Siemens S120, allen Bradley-Rockwell PowerFlex700, powerFlex750, ABB ACS800, ACS880 and the like, the frequency converters have limited data in the production field, a large number of circuit boards in the frequency converter, most maintenance personnel in the field simply check and measure the IGBT rectification inversion units to judge whether the frequency converters are broken down or not, the main cause of the problems and the position of the damaged circuit boards can not be accurately judged in the maintenance process, the new circuit boards can only be replaced in an attempted mode according to fault codes, all damaged devices can be judged by frequent disassembly and assembly machines, the fault judgment is inaccurate, the fault point troubleshooting is incomplete, the new replaced devices can be burned down again in the process of power-up operation, even the danger of the explosion machines is increased, and the economic loss is aggravated. Meanwhile, the personal safety of maintenance personnel is possibly endangered.
The capacitor components of the spare parts of the frequency converter stored in the warehouse for a long time are subjected to long-term standing discharge, explosion accidents easily occur when the spare parts of the frequency converter are directly connected to the machine again, the capacitor is required to be charged and discharged regularly to ensure each performance of the spare parts of the frequency converter, and each frequency converter manufacturer has a special charging and discharging device, but the function is single and the price is high.
Disclosure of Invention
The invention aims to provide a device and a method for comprehensively testing the charge and discharge of a frequency converter, which provide an adjustable power supply, can independently detect the performances of all circuit boards in the frequency converter, and avoid damaging other components when testing on the device; the charging and discharging functions are realized, the charging and discharging of all the frequency converter modules and the circuit board can be realized, and the situation that the capacitor is overdischarged for too long storage time and the frying machine occurs during power-on is avoided; the device has the functions of automatic voltage stabilization, control and display of the device and an operation desk interface, meets the requirements of comprehensively checking the working performance of devices in frequency converters of various brands and models, meets the requirements of charging and discharging of capacitors of frequency converters of various types, establishes a safer maintenance environment and effectively solves the problems in the prior art.
The technical scheme of the invention is as follows: the utility model provides a converter charge-discharge integrated test equipment, includes test bench cabinet body, voltage regulation booster system, rectification unit, PLC control system, touch-sensitive screen operation display area, remote control system and test area, the test bench cabinet body adopts iron plate to make, sets up touch-sensitive screen operation display area, remote control system, test area, rectification unit and voltage regulation booster system on the test bench cabinet body; the output of the PLC control system is respectively connected with the voltage regulating and boosting system, the touch screen operation display area and the remote control system; the PLC control system controls the voltage regulating and boosting system through pulse output, and the output of the voltage regulating and boosting system is connected with the rectifying unit; the voltage regulating and boosting system comprises a booster, a voltage regulator, a stepping motor, an alternating current output current limiting and cutting contactor, a direct current output contactor, an alternating current input contactor, an input power supply aviation socket, a direct current output aviation socket, an alternating current output aviation socket and a stepping motor driving power supply, wherein the PLC control system controls the stepping motor through pulse output, and the stepping motor drives the voltage regulator to regulate voltage through mechanical connection; the output of the voltage regulator is used as the input of the booster, and the output of the booster is sent to the rectifying unit; the device comprises a test bed cabinet body, a rectifier, an aluminum shell resistor, an analog protection load, a direct current capacitor, a direct current smoothing reactor I, a direct current smoothing reactor II, an alternating current output current limiting cut-off contactor, a direct current output contactor, an alternating current input contactor, a voltage dividing resistor, a shunt, a safety, a protection/discharge resistor, a stepping motor driver power supply and a PLC (programmable logic controller) touch screen power supply, wherein the rear area of the test bed cabinet body is provided with the rectifier, the aluminum shell resistor, the analog protection load, the direct current capacitor, the direct current smoothing reactor II, the alternating current output current limiting cut-off contactor, the direct current output contactor, the alternating current input contactor, the voltage dividing resistor, the shunt, the safety, the protection/discharge resistor, the stepping motor driver and the PLC; the side surface of the test bed cabinet body is provided with a radio frequency remote control module, an input power supply aviation socket, a direct current output aviation socket, an alternating current input circuit breaker and a control power supply circuit breaker in an arrangement mode.
One end of the input power aviation socket is connected with a three-phase four-wire power supply, and the other end of the input power aviation socket is connected with a voltage regulator through an alternating current input circuit breaker and an alternating current input contactor; the input power aviation socket is connected with the power supply of the stepping motor driver and the power supply of the PLC and the power supply of the touch screen respectively through the control power circuit breaker.
The rectifying unit comprises an alternating-current voltmeter I, a direct-current voltmeter I, an alternating-current ammeter II, a direct-current ammeter II, a rectifier, a direct-current smoothing reactor I, a direct-current smoothing reactor II, an aluminum shell resistor, an analog protection load and a direct-current capacitor.
The PLC control system comprises a Siemens 1200PLC, an analog input module, an intermediate relay and an emergency stop button.
The touch screen operation display area comprises a touch screen, and the touch screen adopts a new generation intelligent panel of Siemens and is connected with a PLC control system through a blog software programming.
The remote control system comprises a radio frequency remote control module and a remote controller, and the remote controller is connected with the PLC control system through the radio frequency remote control module.
The test area is an area for performing independent test on various unit modules of the frequency converter, and is provided with a direct current power interface and an alternating current power interface.
The protection unit comprises a voltage dividing resistor, a current divider, a safety device, a protection/discharge resistor, a stepping motor driver, an alternating current input breaker, a control power breaker, a stepping motor driver power supply, a PLC and a touch screen power supply.
The comprehensive test method for the charge and discharge of the frequency converter is characterized by comprising the following steps of:
firstly, automatically stabilizing voltage, selecting voltage levels by operating a display area through a touch screen, dividing the voltage levels into three voltage levels of 380V, 500V and 690V,
(1) the three-phase ac380V+ corresponds to dc537V for automatic voltage stabilization and synchronous adjustment;
(2) the three-phase ac500V+ corresponds to dc707V, and the automatic voltage stabilization and synchronous adjustment are carried out;
(3) three-phase ac690V+ corresponds to dc976V automatic voltage stabilization synchronous adjustment;
a control function of selecting an operation mode by operating the display area through the touch screen, wherein the operation mode is divided into three modes of a voltage regulation mode, a charge and discharge mode and a inching mode; a set of remote control system is provided for emergency stop and inching mode operation;
(1) in the inching mode, all three voltage levels are inching adjusted, and the upper rising limit is locked by software so as to not exceed 125% of the voltage levels; the inching voltage reduction is unlimited, and the voltage reduction speed is suitable for the discharge rate of the capacitor; all operations are controlled by buttons and remote control; the corresponding indicator lamps are turned on after the different voltage levels are selected, otherwise, the indicator lamps are turned off; when a plurality of buttons are pressed simultaneously, the click voltage reduction is preferential, and the three voltage levels select the lowest voltage level;
(2) the voltage regulation mode is that corresponding indicator lamps are respectively arranged to flash when the voltage regulation process rises and falls, and the flashing indicator lamps are turned off when the voltage regulation process is not regulated; in the voltage regulation mode, if the alternating current voltage or the direct current voltage exceeds the corresponding voltage class fault set value, the alternating current input contactor is disconnected, and direct current is not output outwards; the release button and the remote control selection voltage regulator automatically return to zero, and in the voltage regulation mode, all contactors can be jumped off and simultaneously work is finished by pressing a remote control 'D' key, and a touch screen displays 'remote control tripping'; when the recovery is carried out, the C key of the remote controller is pressed first to reset so as to continue normal use;
(3) a charge-discharge mode, wherein the dc500mA is charged and discharged for 90 minutes to automatically stop the function, and a process of boosting the dc rated voltage from 0-20V to dc rated voltage and a process of reducing the dc rated voltage from 0-20V are automatically realized every 10 minutes to realize the charge-discharge operation of the capacitor; the AC contactor is firstly attracted, whether the AC voltage is below an initial set value is judged, if the AC voltage is below the set value, the AC input contactor is attracted, otherwise, the AC voltage is firstly reduced below the set value, and then the AC input contactor is attracted; starting boosting after the AC input contactor is attracted until the voltage reaches the selected voltage level; maintaining for 60S time when the selected voltage level is reached, then reducing the voltage, reducing the voltage to an initial set value, and then boosting again until the selected voltage level is reached; repeatedly executing the set cycle number; after the charge and discharge reaches the set cycle number, the AC input contactor trips after the last maintenance 60S is finished, and the touch screen displays 'charge and discharge is finished'; if the alternating current voltage or the direct current voltage exceeds the corresponding voltage class fault set value in the charging and discharging process, the alternating current input contactor is disconnected, and direct current is not output outwards; in the charging and discharging process, all contactors can be jumped off and simultaneously work is finished by pressing a D key of a remote controller, and the touch screen displays 'remote controller tripping'; when the recovery is carried out, the C key of the remote controller is pressed first to reset so as to continue normal use;
(4) the PLC control system completes overall control;
(III) display function
(1) The AC voltmeter and the DC voltmeter are utilized to display AC and DC voltages, and the measuring range is 1000V of AC and 1500V of DC;
(2) displaying load current and dc current-limiting current by using an alternating current ammeter and a direct current ammeter, and using the same meter head, wherein the three-bit and half of the measuring range are 0-20A;
(3) the dc limiting current is not more than 20A;
(IV) Console interface partitioning
(1) The operation table is divided into two areas, one area is a power supply operation area and comprises the selection of a load and a current limiting resistor, and the other area is a test area;
(2) the power supply operation area is controlled by a touch screen, and the 380V grade is selected by default in startup;
(3) the test area is put into a pressure-resistant tester and is embedded into a proper position of the operation table;
(4) simultaneously placing a multimeter, an oscilloscope, a complementary square wave output signal source and an IGBT trigger tool in the test area;
(5) the testing area is put into positive and negative dc + -24V, +24V, +12V and +5V power supplies, and the front of the wiring terminal block is exposed.
The beneficial effects of the invention are as follows: the adjustable power supply is provided, so that the performances of all circuit boards in the frequency converter can be detected independently, and other parts are prevented from being damaged when the equipment is tested; the charging and discharging functions are realized, the charging and discharging of all the frequency converter modules and the circuit board can be realized, and the situation that the capacitor is overdischarged for too long storage time and the frying machine occurs during power-on is avoided; the automatic voltage stabilizing device has an automatic voltage stabilizing function, a control function, a display function of the device and an operation desk interface, meets the requirements of comprehensively checking the working performance of devices in frequency converters of various brands and types, meets the requirements of charging and discharging of capacitors of frequency converters of various types, and establishes a safer maintenance environment.
Drawings
FIG. 1 is a schematic diagram of the front structure of the present invention;
FIG. 2 is a schematic view of the back structure of the present invention;
FIG. 3 is a circuit diagram of the voltage regulating and boosting system of the present invention;
FIG. 4 is a circuit diagram of a portion of a DC tool of the present invention;
FIG. 5 is a diagram of the PLC portion-digital output of the PLC control system of the present invention;
FIG. 6 is a diagram of the PLC portion-digital input of the PLC control system of the present invention;
FIG. 7 is a schematic diagram of the PLC portion-analog input of the PLC control system of the present invention;
FIG. 8 is a schematic diagram of a PLC control section-contactor circuit of the present invention;
in the figure: an ac voltmeter 1, a dc voltmeter 2, an ac voltmeter 3, a dc voltmeter 4, a radio frequency remote control module 5, an emergency stop button 6, an input power supply aviation socket 7, a dc output aviation socket 8, an ac output aviation socket 9, a siemens 1200PLC10, a touch panel 11, an intermediate relay 12, a rectifier 13, an aluminum case resistor 14, an analog protection load 15, a dc capacitor 16, a dc smoothing reactor 17, a dc smoothing reactor 18, an ac output current limiting cut-off contactor 19, a dc output current limiting cut-off contactor 20, a dc output contactor 21, an ac input contactor 22, a booster 23, a voltage regulator 24, a stepping motor 25, a test zone 26, a voltage dividing resistor 27, a shunt 28, a safety 29, a protection/discharge resistor 30, a stepping motor driver 31, an ac input circuit breaker 32, a control power circuit breaker 33, a stepping motor driver power 34, a PLC and a touch panel power supply 35, a dc tool 36, and a remote control 37.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings and the examples.
The utility model provides a converter charge-discharge integrated test equipment, includes test bench cabinet body, voltage regulation booster system, rectification unit, PLC control system, touch-sensitive screen operation display area, remote control system and test area 26, the test bench cabinet body adopts iron plate to make, sets up touch-sensitive screen operation display area, remote control system, test area, rectification unit and voltage regulation booster system on the test bench cabinet body; the output of the PLC control system is respectively connected with the voltage regulating and boosting system, the touch screen operation display area and the remote control system; the PLC control system controls the voltage regulating and boosting system through pulse output, and the output of the voltage regulating and boosting system is connected with the rectifying unit; the voltage regulating and boosting system comprises a booster 23, a voltage regulator 24, a stepping motor 25, an alternating current output current limiting and cutting contactor 19, a direct current output current limiting and cutting contactor 20, a direct current output contactor 21, an alternating current input contactor 22, an input power supply aviation socket 7, a direct current output aviation socket 8, an alternating current output aviation socket 9 and a stepping motor driving power supply, wherein the PLC control system controls the stepping motor 25 through pulse output, and the stepping motor 25 drives the voltage regulator 24 to regulate voltage through mechanical connection; the output of the voltage regulator 24 serves as the input of the booster 23, and the output of the booster 23 is sent to the rectifying unit; the rear region of the test bench cabinet body is provided with a rectifier 13, an aluminum shell resistor 14, a simulated protection load 15, a direct current capacitor 16, a direct current smoothing reactor I17, a direct current smoothing reactor II 18, an alternating current output current limiting cut-off contactor 19, a direct current output current limiting cut-off contactor 20, a direct current output contactor 21, an alternating current input contactor 22, a voltage dividing resistor 27, a shunt 28, a safety 29, a protection/discharge resistor 30, a stepping motor driver 31, a stepping motor driver power supply 34 and a PLC and touch screen power supply 35 in a arrayed manner; the side face of the test bed cabinet body is provided with a radio frequency remote control module 5, an input power supply aviation socket 7, a direct current output aviation socket 8, an alternating current output aviation socket 9, an alternating current input circuit breaker 32 and a control power supply circuit breaker 33 in an arrayed mode.
One end of the input power aviation socket 7 is connected with a three-phase four-wire power supply, and the other end is connected with the voltage regulator 24 through the alternating current input breaker 32 and the alternating current input contactor 22; the input power aviation socket 7 is simultaneously connected with a stepping motor driver power supply 34 and a PLC and touch screen power supply 35 respectively through a control power circuit breaker 33.
The rectifying unit comprises an alternating-current voltmeter I1, a direct-current voltmeter I2, an alternating-current ammeter II 3, a direct-current ammeter II 4, a rectifier 13, a direct-current smoothing reactor I17, a direct-current smoothing reactor II 18, an aluminum shell resistor 14, a simulated protection load 15 and a direct-current capacitor 16.
The PLC control system comprises a Siemens 1200PLC10, an analog input module, an intermediate relay 12 and an emergency stop button 6.
The touch screen operation display area comprises a touch screen 11, and the touch screen 11 adopts a new generation intelligent panel of Siemens and is connected with a PLC control system through a blog software programming.
The remote control system comprises a radio frequency remote control module 5 and a remote controller, and the remote controller is connected into the PLC control system through the radio frequency remote control module 5.
The test area is an area for performing independent test on various unit modules of the frequency converter, and is provided with a direct current power interface and an alternating current power interface.
The protection unit includes a voltage dividing resistor 27, a shunt 28, a fuse 29, a protection/discharge resistor 30, a stepper motor driver 31, an ac input breaker 32, a control power breaker 33, a stepper motor driver power supply 34, and a PLC and touch screen power supply 35.
The comprehensive test method for the charge and discharge of the frequency converter is characterized by comprising the following steps of:
firstly, automatically stabilizing voltage, selecting voltage levels by operating a display area through a touch screen, dividing the voltage levels into three voltage levels of 380V, 500V and 690V,
(1) the three-phase ac380V+ corresponds to dc537V for automatic voltage stabilization and synchronous adjustment;
(2) the three-phase ac500V+ corresponds to dc707V, and the automatic voltage stabilization and synchronous adjustment are carried out;
(3) three-phase ac690V+ corresponds to dc976V automatic voltage stabilization synchronous adjustment;
a control function of selecting an operation mode by operating the display area through the touch screen, wherein the operation mode is divided into three modes of a voltage regulation mode, a charge and discharge mode and a inching mode; a set of remote control system is provided for emergency stop and inching mode operation;
(1) in the inching mode, all three voltage levels are inching adjusted, and the upper rising limit is locked by software so as to not exceed 125% of the voltage levels; the inching voltage reduction is unlimited, and the voltage reduction speed is suitable for the discharge rate of the capacitor; all operations are controlled by buttons and remote control; the corresponding indicator lamps are turned on after the different voltage levels are selected, otherwise, the indicator lamps are turned off; when a plurality of buttons are pressed simultaneously, the click voltage reduction is preferential, and the three voltage levels select the lowest voltage level;
(2) the voltage regulation mode is that corresponding indicator lamps are respectively arranged to flash when the voltage regulation process rises and falls, and the flashing indicator lamps are turned off when the voltage regulation process is not regulated; in the voltage regulation mode, if the alternating current voltage or the direct current voltage exceeds the corresponding voltage class fault set value, the alternating current input contactor is disconnected, and direct current is not output outwards; the release button and the remote control selection voltage regulator automatically return to zero, and in the voltage regulation mode, all contactors can be jumped off and simultaneously work is finished by pressing a remote control 'D' key, and a touch screen displays 'remote control tripping'; when the recovery is carried out, the C key of the remote controller is pressed first to reset so as to continue normal use;
(3) a charge-discharge mode, wherein the dc500mA is charged and discharged for 90 minutes to automatically stop the function, and a process of boosting the dc rated voltage from 0-20V to dc rated voltage and a process of reducing the dc rated voltage from 0-20V are automatically realized every 10 minutes to realize the charge-discharge operation of the capacitor; the AC contactor is firstly attracted, whether the AC voltage is below an initial set value is judged, if the AC voltage is below the set value, the AC input contactor is attracted, otherwise, the AC voltage is firstly reduced below the set value, and then the AC input contactor is attracted; starting boosting after the AC input contactor is attracted until the voltage reaches the selected voltage level; maintaining for 60S time when the selected voltage level is reached, then reducing the voltage, reducing the voltage to an initial set value, and then boosting again until the selected voltage level is reached; repeatedly executing the set cycle number; after the charge and discharge reaches the set cycle number, the AC input contactor trips after the last maintenance 60S is finished, and the touch screen displays 'charge and discharge is finished'; if the alternating current voltage or the direct current voltage exceeds the corresponding voltage class fault set value in the charging and discharging process, the alternating current input contactor is disconnected, and direct current is not output outwards; in the charging and discharging process, all contactors can be jumped off and simultaneously work is finished by pressing a D key of a remote controller, and the touch screen displays 'remote controller tripping'; when the recovery is carried out, the C key of the remote controller is pressed first to reset so as to continue normal use;
(4) the PLC control system completes overall control;
(III) display function
(1) The AC voltmeter and the DC voltmeter are utilized to display AC and DC voltages, and the measuring range is 1000V of AC and 1500V of DC;
(2) displaying load current and dc current-limiting current by using an alternating current ammeter and a direct current ammeter, and using the same meter head, wherein the three-bit and half of the measuring range are 0-20A;
(3) the dc limiting current is not more than 20A;
(IV) Console interface partitioning
(1) The operation table is divided into two areas, one area is a power supply operation area and comprises the selection of a load and a current limiting resistor, and the other area is a test area;
(2) the power supply operation area is controlled by a touch screen, and the 380V grade is selected by default in startup;
(3) the test area is put into a pressure-resistant tester and is embedded into a proper position of the operation table;
(4) simultaneously placing a multimeter, an oscilloscope, a complementary square wave output signal source and an IGBT trigger tool in the test area;
(5) the testing area is put into positive and negative dc + -24V, +24V, +12V and +5V power supplies, and the front of the wiring terminal block is exposed.
In practical application, the operation steps are as follows:
voltage regulating mode (for frequency converter maintenance, providing AC/DC power supply with different voltage class and frequency)
1. Selecting a voltage regulation mode through a touch screen in a working mode;
2. selecting a required voltage level of 380V, 500V or 690V through a touch screen voltage selection frame;
3. pressing a system start button to start working;
4. the AC incoming line contactor KM2 is attracted;
5. after KM2 is attracted for 2S, voltage regulation is started according to the selected voltage level;
6. the direct current outlet contactor KM1 is attracted after the attraction of KM2 for 5S;
7. after the work is finished, a system stop button is pressed, the work is finished, KM1 and KM2 are disconnected, and then other operations (such as voltage regulation of other voltage levels or entering other working modes) are performed;
8. during the voltage regulation, if the alternating voltage or the direct voltage exceeds the corresponding voltage class fault set value (380 class set 420VAC/600VDC, 500 class set 550VAC/780VDC, 690 class set 760VAC/1080 VDC), KM1 is disconnected, and direct current is not output;
9. in the voltage regulation process, all contactors can be jumped off and simultaneously work is finished by pressing a key of a remote controller 'D', and a touch screen displays 'remote controller tripping'; when the operation is resumed, the C key of the remote controller is pressed to reset, so that the normal operation can be continued.
(II) charge and discharge modes (for automatically executing the charge and discharge operations of the capacitor of the transducer)
1. Selecting a charge and discharge mode through the working mode of the touch screen;
2. selecting a required voltage level of 380V, 500V or 690V through a touch screen voltage selection frame;
3. pressing a system start button to start working;
4. the AC incoming line contactor KM2 is attracted;
5. judging whether the alternating voltage is below an initial set value (100V), if so, attracting KM1, otherwise, reducing the alternating voltage below the set value and attracting KM1;
6. starting boosting after the KM1 is absorbed until reaching a selected voltage level;
7. maintaining for 60S time when reaching the selected voltage level, and then regulating the voltage downwards;
8. down-regulating the voltage to an initial set value and then boosting again until the selected voltage level is reached;
9. repeatedly executing the setting cycle numbers (6 cycles) of the 7 th and 8 th steps;
10. after the charge and discharge reaches the set cycle number, KM1 trips after the last maintenance 60S is finished, and the touch screen displays 'charge and discharge is finished';
11. after the work is finished, a system stop button is pressed, the work is finished, KM1 and KM2 are disconnected, and then other operations (such as charging and discharging of other voltage levels or entering other working modes) are performed;
12. during the charge and discharge process, if the alternating voltage or the direct voltage exceeds the corresponding voltage class fault set value (380 class set 420VAC/600VDC, 500 class set 550VAC/780VDC, 690 class set 760VAC/1080 VDC), KM1 is disconnected, and direct current is not output;
13. in the charging and discharging process, all contactors can be jumped off and simultaneously work is finished by pressing a D key of a remote controller, and the touch screen displays 'remote controller tripping'; when the operation is resumed, the C key of the remote controller is pressed to reset, so that the normal operation can be continued.
Click mode (custom occasion, voltage class and type are selected according to user's needs)
1. Selecting a click mode through a touch screen in a working mode;
2. the AC incoming line contactor KM2 is attracted;
3. KM1 is attracted after KM2 is attracted for 5S;
4. pressing the key A of the remote controller to rise in voltage;
5. pressing the key B of the remote controller to reduce the voltage;
6. pressing the D key of the remote controller to jump off all contactors and finish the work at the same time, and displaying the 'remote controller tripping' on the touch screen; when the operation is resumed, the C key of the remote controller is pressed to reset, so that the normal operation can be continued.
And (IV) cutting off the alternating current limiting resistor and the direct current limiting resistor:
the operation is realized through the touch screen according to the requirement.
Claims (8)
1. The utility model provides a converter charge-discharge integrated test equipment which characterized in that: the test bed comprises a test bed cabinet body, a voltage regulating and voltage increasing system, a rectifying unit, a PLC control system, a touch screen operation display area, a remote control system and a test area (26), wherein the test bed cabinet body is made of iron plates, and the touch screen operation display area, the remote control system, the test area, the rectifying unit and the voltage regulating and voltage increasing system are arranged on the test bed cabinet body; the output of the PLC control system is respectively connected with the voltage regulating and boosting system, the touch screen operation display area and the remote control system; the PLC control system controls the voltage regulating and boosting system through pulse output, and the output of the voltage regulating and boosting system is connected with the rectifying unit; the voltage regulating and boosting system comprises a booster (23), a voltage regulator (24), a stepping motor (25), an alternating current output current limiting and cutting contactor (19), a direct current output current limiting and cutting contactor (20), a direct current output contactor (21), an alternating current input contactor (22), an input power aviation socket (7), a direct current output aviation socket (8), an alternating current output aviation socket (9) and a stepping motor driving power supply, wherein the PLC control system controls the stepping motor (25) through pulse output, and the stepping motor (25) drives the voltage regulator (24) to regulate voltage through mechanical connection; the output of the voltage regulator (24) is used as the input of the booster (23), and the output of the booster (23) is sent to the rectifying unit; the rear region of the test bed cabinet body is provided with a rectifier (13), an aluminum shell resistor (14), an analog protection load (15), a direct current capacitor (16), a direct current smoothing reactor I (17), a direct current smoothing reactor II (18), an alternating current output current limiting cut-off contactor (19), a direct current output current limiting cut-off contactor (20), a direct current output contactor (21), an alternating current input contactor (22), a voltage dividing resistor (27), a shunt (28), a safety (29), a protection/discharge resistor (30), a stepping motor driver (31), a stepping motor driver power supply (34) and a PLC and touch screen power supply (35) in a arrayed mode; the side surface of the test bed cabinet body is provided with a radio frequency remote control module (5), an input power supply aviation socket (7), a direct current output aviation socket (8), an alternating current output aviation socket (9), an alternating current input circuit breaker (32) and a control power supply circuit breaker (33); the PLC control system comprises a Siemens 1200PLC (10), an analog input module, an intermediate relay (12) and a scram button (6).
2. The frequency converter charge-discharge comprehensive test device according to claim 1, wherein: one end of the input power aviation socket (7) is connected with a three-phase four-wire power supply, and the other end of the input power aviation socket is connected with a voltage regulator (24) through an alternating current input circuit breaker (32) and an alternating current input contactor (22); the input power aviation socket (7) is connected with a stepping motor driver power supply (34) and a PLC and touch screen power supply (35) through a control power circuit breaker (33) at the same time.
3. The frequency converter charge-discharge comprehensive test device according to claim 1, wherein: the rectification unit comprises an alternating-current voltmeter I (1), a direct-current voltmeter I (2), an alternating-current ammeter II (3), a direct-current ammeter II (4), a rectifier (13), a direct-current smoothing reactor I (17), a direct-current smoothing reactor II (18), an aluminum shell resistor (14), an analog protection load (15) and a direct-current capacitor (16).
4. The frequency converter charge-discharge comprehensive test device according to claim 1, wherein: the touch screen operation display area comprises a touch screen (11), and the touch screen (11) adopts a new generation intelligent panel of Siemens and is connected with a PLC control system through a blog software programming.
5. The frequency converter charge-discharge comprehensive test device according to claim 1, wherein: the remote control system comprises a radio frequency remote control module (5) and a remote controller, and the remote controller is connected into the PLC control system through the radio frequency remote control module (5).
6. The frequency converter charge-discharge comprehensive test device according to claim 1, wherein: the test area is an area for performing independent test on various unit modules of the frequency converter, and is provided with a direct current power interface and an alternating current power interface.
7. The frequency converter charge-discharge comprehensive test device according to claim 1, wherein: the test bench cabinet body is provided with a protection unit, and the protection unit comprises a voltage dividing resistor (27), a current divider (28), a safety device (29), a protection/discharge resistor (30), a stepping motor driver (31), an alternating current input breaker (32), a control power breaker (33), a stepping motor driver power supply (34) and a PLC and touch screen power supply (35).
8. A method for comprehensively testing charge and discharge of a frequency converter by adopting the experimental equipment of any one of claims 1-7, which is characterized by comprising the following steps:
firstly, automatically stabilizing voltage, selecting voltage levels by operating a display area through a touch screen, dividing the voltage levels into three voltage levels of 380V, 500V and 690V,
(1) the three-phase ac380V+ corresponds to dc537V for automatic voltage stabilization and synchronous adjustment;
(2) the three-phase ac500V+ corresponds to dc707V, and the automatic voltage stabilization and synchronous adjustment are carried out;
(3) three-phase ac690V+ corresponds to dc976V automatic voltage stabilization synchronous adjustment;
a control function of selecting an operation mode by operating the display area through the touch screen, wherein the operation mode is divided into three modes of a voltage regulation mode, a charge and discharge mode and a inching mode; a set of remote control system is provided for emergency stop and inching mode operation;
(1) in the inching mode, all three voltage levels are inching adjusted, and the upper rising limit is locked by software so as to not exceed 125% of the voltage levels; the inching voltage reduction is unlimited, and the voltage reduction speed is suitable for the discharge rate of the capacitor; all operations are controlled by buttons and remote control; the corresponding indicator lamps are turned on after the different voltage levels are selected, otherwise, the indicator lamps are turned off; when a plurality of buttons are pressed simultaneously, the click voltage reduction is preferential, and the three voltage levels select the lowest voltage level;
(2) the voltage regulation mode is that corresponding indicator lamps are respectively arranged to flash when the voltage regulation process rises and falls, and the flashing indicator lamps are turned off when the voltage regulation process is not regulated; in the voltage regulation mode, if the alternating current voltage or the direct current voltage exceeds the corresponding voltage class fault set value, the alternating current input contactor is disconnected, and direct current is not output outwards; the release button and the remote control selection voltage regulator automatically return to zero, and in the voltage regulation mode, all contactors can be jumped off by pressing a key D of the remote control and simultaneously work is finished, and at the moment, the touch screen displays tripping of the remote control; when the recovery is carried out, the key C of the remote controller is pressed first to reset so as to continue normal use;
(3) a charge-discharge mode, wherein the dc500mA is charged and discharged for 90 minutes to automatically stop the function, and a process of boosting the dc0-20V to the dc rated voltage and a process of reducing the dc rated voltage to the dc0-20V are automatically realized every 10 minutes to realize the charge-discharge operation of the capacitor; the AC contactor is firstly attracted, whether the AC voltage is below an initial set value is judged, if the AC voltage is below the set value, the AC input contactor is attracted, otherwise, the AC voltage is firstly reduced below the set value, and then the AC input contactor is attracted; starting boosting after the AC input contactor is attracted until the voltage reaches the selected voltage level; maintaining for 60S time when the selected voltage level is reached, then reducing the voltage, reducing the voltage to an initial set value, and then boosting again until the selected voltage level is reached; repeatedly executing the set cycle number; after the charge and discharge reaches the set cycle number, the AC input contactor trips after the last maintenance 60S is finished, and the touch screen displays the charge and discharge; if the alternating current voltage or the direct current voltage exceeds the corresponding voltage class fault set value in the charging and discharging process, the alternating current input contactor is disconnected, and direct current is not output outwards; in the charging and discharging process, all contactors can be tripped off and simultaneously work is finished by pressing a key D of the remote controller, and the touch screen displays tripping of the remote controller at the moment; when the recovery is carried out, the key C of the remote controller is pressed first to reset so as to continue normal use;
(4) the PLC control system completes overall control;
(III) display function
(1) The AC voltmeter and the DC voltmeter are utilized to display AC and DC voltages, and the measuring range is 1000V of AC and 1500V of DC;
(2) displaying load current and dc current-limiting current by using an alternating current ammeter and a direct current ammeter, and using the same meter head, wherein the three-bit and half of the measuring range are 0-20A;
(3) the dc limiting current is not more than 20A;
(IV) Console interface partitioning
(1) The operation table is divided into two areas, one area is a power supply operation area and comprises the selection of a load and a current limiting resistor, and the other area is a test area;
(2) the power supply operation area is controlled by a touch screen, and the 380V grade is selected by default in startup;
(3) the test area is put into a pressure-resistant tester and is embedded into a proper position of the operation table;
(4) simultaneously placing a multimeter, an oscilloscope, a complementary square wave output signal source and an IGBT trigger tool in the test area;
(5) the testing area is put into positive and negative dc + -24V, +24V, +12V and +5V power supplies, and the front of the wiring terminal block is exposed.
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