CN113075489A - Method and system for detecting terminal strip of frequency converter - Google Patents
Method and system for detecting terminal strip of frequency converter Download PDFInfo
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- CN113075489A CN113075489A CN202110361079.0A CN202110361079A CN113075489A CN 113075489 A CN113075489 A CN 113075489A CN 202110361079 A CN202110361079 A CN 202110361079A CN 113075489 A CN113075489 A CN 113075489A
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- 238000001514 detection method Methods 0.000 claims abstract description 66
- 238000012360 testing method Methods 0.000 claims abstract description 42
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- 238000006243 chemical reaction Methods 0.000 claims description 7
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses a method and a system for detecting a terminal strip of a frequency converter, wherein the system comprises the following steps: the embodiment of the invention provides a frequency converter terminal strip detection system, which is connected with a functional terminal strip of a tested frequency converter, and the terminal strip at least comprises: the input/output analog quantity terminal, the switching value terminal and the relay on-off terminal; the binding post row of connecting the converter under test includes at least: a three-phase voltage terminal; a PLC analog quantity detection module; the relay is used for controlling the on-off of the terminal of the tested frequency converter; a voltage monitoring table; and the PC is connected with the PLC analog quantity detection module, the driving control board, the tested frequency converter and the voltage monitoring meter. Under the condition that the measuring mode is not changed, a plurality of complex detection items such as functional terminal strip test analog quantity, switching quantity, relay on-off, test output three-phase voltage balance and the like can be measured simultaneously, and the data comparison requirement is met simultaneously. Therefore, the technical effects of improving the detection accuracy and adapting to more complex detection requirements are achieved.
Description
Technical Field
The invention relates to the field of frequency converter testing, in particular to a method and a system for detecting a terminal strip of a frequency converter.
Background
With the development of frequency conversion technology, frequency converters are continuously updated, and corresponding test equipment is also updated accordingly.
The traditional mode to the converter test is manual test, because the converter type number specification is more, and terminal row functional sequence is non-uniform, appears leaking testing in the work easily, and the requirement to the test is higher simultaneously.
Therefore, the frequency converter testing method and system which continuously reduce manual testing steps improve the detection accuracy and adapt to more complex detection requirements, and become a problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a system and a method for detecting a terminal strip of a frequency converter, so as to achieve the technical aims of improving the detection accuracy and adapting to more complex detection requirements.
A frequency converter terminal strip detection system, comprising:
connect the functional terminal row of being surveyed the converter, the terminal row includes at least: the input/output analog quantity terminal, the switching value terminal and the relay on-off terminal;
the binding post row of connecting the converter under test includes at least: a three-phase voltage terminal;
a PLC analog quantity detection module;
the relay is used for controlling the on-off of the terminal of the tested frequency converter;
a voltage monitoring table;
and the combination of (a) and (b),
and the PC is connected with the PLC analog quantity detection module, the driving control board, the tested frequency converter and the voltage monitoring meter.
Preferably, the PLC analog quantity detection module is specifically configured to:
the multi-channel analog quantity signals are connected to the input end of the PLC analog quantity detection module;
and setting a preset voltage signal of the operational amplifier unit to perform voltage stabilization control.
Preferably, the system further comprises a frequency conversion register, specifically configured to:
the PLC analog quantity detection module samples the voltage of a YC pin of a frequency conversion register to the ground by controlling the starting and stopping of the frequency converter to be detected;
and matching the voltage of the YC pin to the ground with the relay board to control the terminal of the frequency converter to be tested to be connected with only one circuit, and testing the analog quantity of the frequency converter to be tested according to a preset voltage algorithm.
Preferably, the PLC analog quantity detection module further performs: and the Y coil controls each path of relay, when the Y coil has a signal, the relay is closed, otherwise, the relay is opened, and the PC reads the state of the switching value of the terminal of the tested frequency converter.
Preferably, the PLC analog quantity detection module further performs: the X input coil detects high and low levels and comprises:
the tested frequency converter is controlled to achieve the action of a control relay, a common point signal is transmitted to a normally closed point or a normally open point, and the X input coil detects a high-low level judgment signal.
Preferably, the X input coil of the PLC analog detection module detects a high-low level, and is specifically implemented as follows:
collecting a normally closed point signal, inputting a COM level to a common end of the relay, connecting a normally closed point output with a PLC X input coil, and reading the state of the X input coil by the PC machine, wherein the level of the X input coil is a high level;
the PC controls the tested frequency converter to operate and reads the state value of the X input coil again, the coil level is low level at the moment, and when the PC acquires that the state value of the X input coil is from 1 to 0, the normal close contact is judged to be normal;
collecting a normally open point signal, inputting a COM level to a common end of the relay, connecting a PLC X input coil to a normally open point output, and reading the state of the X input coil by the PC machine, wherein the level of the X input coil is a low level;
the PC controls the tested frequency converter to operate and reads the state value of the X input coil again, the level of the X input coil is high, and when the PC acquires that the state value of the X input coil is from 0 to 1, the normally open contact is judged to be normal;
and the relay test is carried out by utilizing the short circuit of the X input coil and COM, X is arranged at an ON position by utilizing the X input coil and is arranged at an OFF position after being disconnected, the common end of the relay is connected with the COM signal, and the normally open and normally closed contact wiring rings X of the relay are operated to read the X state once before and after the tested frequency converter is operated, so as to judge whether the relay is operated normally.
Preferably, the voltage monitoring table is configured to:
485 communication is carried out with the PC, and CRC16 check bits are set.
The invention also discloses a frequency converter terminal strip detection method which is applied to the frequency converter terminal strip detection system.
Preferably, when the state of testing the terminal switching value of the frequency converter to be tested is performed by using a PLC analog quantity detection module, the PC executes:
setting an S terminal for short-circuiting a certain circuit of the frequency converter to be tested;
reading the address of a state register operated by the frequency converter to be tested;
judging whether the flag bit of the state register is the current short-circuited S terminal bit of 1 and the rest S terminal bits are 0;
and when the test is finished, disconnecting the S terminal of the tested frequency converter.
The embodiment of the invention provides a frequency converter terminal strip detection system, which can realize the simultaneous measurement of a plurality of complex detection items, such as functional terminal strip test analog quantity, switching quantity, relay on-off, test output three-phase voltage balance and the like, by matching a functional terminal strip and a wiring terminal strip of a tested frequency converter with a PLC analog quantity detection module, a relay for controlling the on-off of a terminal of the tested frequency converter, a voltage monitoring table and a PC (personal computer) without changing a measurement mode, and simultaneously meet the data comparison requirement. Therefore, the technical effects of improving the detection accuracy and adapting to more complex detection requirements are achieved.
Drawings
FIG. 1 is a schematic structural diagram of a detection system for a terminal block of a frequency converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a PLC analog quantity detection circuit of a terminal block detection system of a frequency converter according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a detection system for a terminal block of a frequency converter according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the structure of a system register for detecting terminal blocks of a frequency converter according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a switching value detection circuit of the detection system of the terminal block of the frequency converter according to the embodiment of the present invention;
fig. 6 is a flowchart of a method for detecting a terminal strip of a frequency converter according to an embodiment of the present invention.
Detailed Description
The invention relates to a detection system and a scheme for a terminal strip of a frequency converter, aiming at achieving the technical aims of improving the detection accuracy and meeting more complex detection requirements.
Fig. 1 shows a frequency converter terminal block detection system comprising:
a functional terminal block for connecting the frequency converter under test 100, said terminal block comprising at least: the input/output analog quantity terminal, the switching value terminal and the relay on-off terminal;
the terminal block connected to the frequency converter under test 100 at least includes: a three-phase voltage terminal;
a PLC analog quantity detection module 20;
in order to adapt to the tests of analog quantity, switching value, relay on-off and test output three-phase voltage balance, in the system:
and (3) testing the analog quantity: the PLC analog quantity detection module 30 is connected with the functional terminal row 1 of the frequency converter 10 to be tested to realize the test of the analog quantity:
the PLC analog quantity detection module 20 is specifically configured to:
the multi-channel analog quantity signals are connected to the input end of the PLC analog quantity detection module 20;
setting an operational amplifier unit to preset a voltage signal for voltage stabilization control;
for example, referring to fig. 2, the system preferably implements 5 analog quantity signals to access to the input end of the PLC analog quantity detection module 30, and simultaneously, the range is customized to 0-10V; three groups of voltages are set to exceed 10V, in order to meet the measurement requirement, three groups of signals are subjected to operational amplification, and after LM224 operational amplification, the full-scale output of the voltage is controlled to be about 9V. The quantity and voltage values given in the examples are not intended to limit the invention.
As shown in fig. 2, further, taking the 12V path as an example: FS is +12V, FV2 is GND; in summary, the 12V signal is input through the operational amplifier and output is 8.945V, when 8.945V is acquired by the PLC analog module and calculated through the PC programming, the actual voltage is U-sampling voltage 11/8.2-8.945-1.34-12V; the rest of the ways are obtained in turn by referring to the method; the system has the advantages that 8 paths of samples are sampled in real time, and the response time is within 100 ms; the data supports the reading of the data blocks, and the communication efficiency is greatly improved.
Referring to fig. 3, the system further includes a frequency conversion register 30, specifically configured to:
by controlling the on-off of the tested frequency converter through a frequency conversion register 30, the PLC analog quantity detection module 20 samples the voltage of the YC pin of the register to the ground;
and matching the voltage of the YC pin to the ground with the relay board to control the terminal of the frequency converter to be tested to be connected with only one circuit, and testing the analog quantity of the frequency converter to be tested according to a preset voltage algorithm.
More specifically, referring to fig. 4, by setting the inverter register 30, it is possible to control the inverter to operate with Y3 and YC turned on, or with Y4 and YC turned on; adding a reference voltage into Y3 and Y4, controlling the on and off of an optical coupler by controlling the operation stop of a frequency converter, sampling the voltage of YC to GND by a PLC analog module in real time, wherein the voltage U of the YC in an on state is Y3(Y4), and the input voltage-tube voltage drop is-0.3V;
the on-off state of the optical coupler can be measured by collecting the voltage of YC to GND, a voltage is superposed to a collector, a system supplies 8.5V to the collector, when the triode is switched on, the voltage of an emitter is sampled, a switching-on voltage drop is reduced by 0.3V, and the actually sampled voltage is 8.2V; the correct sampling of the on-off of the triode is achieved; in order to switch signals through a relay before inputting signals when one path is switched off and the other path is switched off in a test, only one path is effectively switched on in the test, and the correctness of a test result is ensured.
The relay is used for controlling the on-off of the terminal of the tested frequency converter;
a voltage monitoring table 40;
and the combination of (a) and (b),
and the PC 50 is connected with the PLC analog quantity detection module 20, the driving control board 60, the frequency converter 100 to be detected and the voltage monitoring meter 40.
The PLC analog quantity detection module executes:
and the Y coil controls each path of relay, when the Y coil has a signal, the relay is closed, otherwise, the relay is opened, and the PC reads the state of the switching value of the terminal of the tested frequency converter.
It should be noted that, when the switching value result of the terminal of the tested frequency converter is judged, only one path is allowed to be switched on and the signal is set, so that the correctness of the sampling result is ensured.
For switching quantity test relay detection, referring to figure 6,
the PLC analog quantity detection module further executes: the X input coil detects high and low levels and comprises:
the tested frequency converter is controlled to achieve the action of a control relay, a common point signal is transmitted to a normally closed point or a normally open point, and the X input coil detects a high-low level judgment signal.
More specifically, a normally closed point signal is collected, a COM level is input to a common end of the relay, an output of a normally closed point is connected with an X input coil, the PC machine reads the state of the X input coil, and the level of the X input coil is a high level;
the PC controls the tested frequency converter to operate and reads the state value of the X input coil again, the coil level is low level at the moment, and when the PC acquires that the state value of the X input coil is from 1 to 0, the normal close contact is judged to be normal;
collecting a normally open point signal, inputting a COM level to a common end of the relay, connecting a PLC X input coil to a normally open point output, and reading the state of the X input coil by the PC machine, wherein the level of the X input coil is a low level;
the PC controls the tested frequency converter to operate and reads the state value of the X input coil again, the level of the X input coil is high, and when the PC acquires that the state value of the X input coil is from 0 to 1, the normally open contact is judged to be normal;
and the relay test is carried out by utilizing the short circuit of the X input coil and COM, X is arranged at an ON position by utilizing the X input coil and is arranged at an OFF position after being disconnected, the common end of the relay is connected with the COM signal, and the normally open and normally closed contact wiring rings X of the relay are operated to read the X state once before and after the tested frequency converter is operated, so as to judge whether the relay is operated normally.
For voltage testing, the voltage monitoring table is configured to:
485 communication is carried out with the PC, and CRC16 check bits are set.
For example, alternating voltage is sampled by the voltage monitoring instrument, 660V is considered in range design, and the output voltage of a normal frequency converter is 400V; the maximum voltage is not more than 430V, and the maximum voltage is less than the measuring range of the voltage monitoring instrument, so that the safety requirement is met; because three-phase balance is measured, the precision requirement is controlled to be 2 percent, the precision of the instrument is 1.5 percent, and the instrument meets the test requirement; simultaneously, 485 communication is supported, the voltage data block can be automatically read while output, the real-time performance is good, and the correctness of a sampling result is achieved;
the voltage monitoring instrument is a CRC16 check bit, and is directly connected below a 485 bus of the frequency converter and modifies the baud rate and the address in order to save the serial port communication cost; and processing the CRC16 data received by the PC end (the frame length meets the requirement and is recalculated, and the received partial data is recalculated with CRC16 and is compared with the received CRC 16), extracting the data of the data field, and converting and displaying the floating point number in the IEEE format.
Referring to fig. 6, the present invention also discloses a method for detecting a terminal strip of a frequency converter, which is applied to a system for detecting a terminal strip of a frequency converter in the figure.
Preferably, when the state of testing the terminal switching value of the frequency converter to be tested is performed by using a PLC analog quantity detection module, the PC executes:
s61: setting an S terminal for short-circuiting a certain circuit of the frequency converter to be tested, and controlling a Y input coil to set ON at the moment;
reading the address of a state register operated by the frequency converter to be tested;
judging whether the flag bit of the state register is the current short-circuited S terminal bit of 1 and the rest S terminal bits are 0;
and when the test is finished, disconnecting the S terminal of the tested frequency converter, and controlling the Y input coil to be set OFF at the moment.
In summary, the following steps:
the embodiment of the invention provides a frequency converter terminal strip detection system, which can realize the simultaneous measurement of a plurality of complex detection items, such as functional terminal strip test analog quantity, switching quantity, relay on-off, test output three-phase voltage balance and the like, by matching a functional terminal strip and a wiring terminal strip of a tested frequency converter with a PLC analog quantity detection module, a relay for controlling the on-off of a terminal of the tested frequency converter, a voltage monitoring table and a PC (personal computer) without changing a measurement mode, and simultaneously meet the data comparison requirement. Therefore, the technical effects of improving the detection accuracy and adapting to more complex detection requirements are achieved.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or steps disclosed herein, but extend to equivalents thereof as would be understood by those skilled in the relevant art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the embodiments are only used for the understanding of the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A frequency converter terminal strip detection system, comprising:
connect the functional terminal row of being surveyed the converter, the terminal row includes at least: the input/output analog quantity terminal, the switching value terminal and the relay on-off terminal;
the binding post row of connecting the converter under test includes at least: a three-phase voltage terminal;
a PLC analog quantity detection module;
the relay is used for controlling the on-off of the terminal of the tested frequency converter;
a voltage monitoring table;
and the combination of (a) and (b),
and the PC is connected with the PLC analog quantity detection module, the driving control board, the tested frequency converter and the voltage monitoring meter.
2. The frequency converter terminal block detecting system according to claim 1,
the PLC analog quantity detection module is specifically configured as follows:
the multi-channel analog quantity signals are connected to the input end of the PLC analog quantity detection module;
and setting a preset voltage signal of the operational amplifier unit to perform voltage stabilization control.
3. The frequency converter terminal block detection system of any one of claims 1-2, further comprising: the frequency conversion register is specifically configured to:
the PLC analog quantity detection module samples the voltage of a YC pin of a frequency conversion register to the ground by controlling the starting and stopping of the frequency converter to be detected;
and matching the voltage of the YC pin to the ground with the relay board to control the terminal of the frequency converter to be tested to be connected with only one circuit, and testing the analog quantity of the frequency converter to be tested according to a preset voltage algorithm.
4. The frequency converter terminal block detecting system according to any one of claim 1,
the PLC analog quantity detection module further executes: and the Y coil controls each path of relay, when the Y coil has a signal, the relay is closed, otherwise, the relay is opened, and the PC reads the state of the switching value of the terminal of the tested frequency converter.
5. The frequency converter terminal block detection method according to claim 1, wherein the PLC analog quantity detection module further performs: the X input coil detects high and low levels and comprises:
the tested frequency converter is controlled to achieve the action of a control relay, a common point signal is transmitted to a normally closed point or a normally open point, and the X input coil detects a high-low level judgment signal.
6. The frequency converter terminal block detecting method according to claim 5,
the X input coil of PLC analog quantity detection module detects the high-low level, specifically realizes as:
collecting a normally closed point signal, inputting a COM level to a common end of the relay, connecting a normally closed point output with a PLC X input coil, and reading the state of the X input coil by the PC machine, wherein the level of the X input coil is a high level;
the PC controls the tested frequency converter to operate and reads the state value of the X input coil again, the coil level is low level at the moment, and when the PC acquires that the state value of the X input coil is from 1 to 0, the normal close contact is judged to be normal;
collecting a normally open point signal, inputting a COM level to a common end of the relay, connecting a PLC X input coil to a normally open point output, and reading the state of the X input coil by the PC machine, wherein the level of the X input coil is a low level;
the PC controls the tested frequency converter to operate and reads the state value of the X input coil again, the level of the X input coil is high, and when the PC acquires that the state value of the X input coil is from 0 to 1, the normally open contact is judged to be normal;
and the relay test is carried out by utilizing the short circuit of the X input coil and COM, X is arranged at an ON position by utilizing the X input coil and is arranged at an OFF position after being disconnected, the common end of the relay is connected with the COM signal, and the normally open and normally closed contact wiring rings X of the relay are operated to read the X state once before and after the tested frequency converter is operated, so as to judge whether the relay is operated normally.
7. The method of claim 5, wherein the voltage monitoring table is configured to:
485 communication is carried out with the PC, and CRC16 check bits are set.
8. A method for detecting a terminal block of a frequency converter, characterized by being applied to the detection system of a terminal block of a frequency converter according to claims 1-7.
9. The method for detecting a terminal block of a frequency converter as recited in claim 8, wherein when the testing of the state of the switching value of the terminal block of the frequency converter under test is performed by using a PLC analog quantity detection module, the PC performs:
setting an S terminal for short-circuiting a certain circuit of the frequency converter to be tested;
reading the address of a state register operated by the frequency converter to be tested;
judging whether the flag bit of the state register is the current short-circuited S terminal bit of 1 and the rest S terminal bits are 0;
and when the test is finished, disconnecting the S terminal of the tested frequency converter.
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