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CN113791606B - A self-diagnosis system for screw compressor controller - Google Patents

A self-diagnosis system for screw compressor controller Download PDF

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Publication number
CN113791606B
CN113791606B CN202111090172.9A CN202111090172A CN113791606B CN 113791606 B CN113791606 B CN 113791606B CN 202111090172 A CN202111090172 A CN 202111090172A CN 113791606 B CN113791606 B CN 113791606B
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screw compressor
controller
output
input
analog
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CN113791606A (en
Inventor
程光明
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Shanghai Screw Compressor Co Ltd
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Shanghai Screw Compressor Co Ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
    • G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/24—Pc safety
    • G05B2219/24065—Real time diagnostics

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention discloses a self-diagnosis system of a screw compressor controller, which comprises a screw compressor and a controller, wherein the screw compressor is used as equipment, and needs to control the output of switching values such as a contactor, an electromagnetic valve, operation/failure and the like and the output of analog values such as current, temperature, pressure and the like; when the screw compressor is electrified or overhauled before running, the controller can simulate the input of the switching value and the analog value one by one according to the process requirement of the screw compressor and the determined control logic, and compare the switching value and the analog value output of the simulation result with the logic output, thereby realizing the self-diagnosis of the controller, knowing or assisting to be familiar with the real-time condition of the controller in advance, and maintaining the controller timely so as not to influence the running of the screw compressor.

Description

Screw compressor controller self-diagnosis system
Technical Field
The invention relates to the related field of variable-frequency screw compressors, in particular to a screw compressor controller self-diagnosis system.
Background
The screw compressor is a mechanical device with very wide application, and has important application in the fields of machinery, metallurgy, spinning, food and the like; for the occasion of using the screw compressor, the main body with the fault can be judged and solved by the controller; the controller faults are basically divided into internal faults and external faults; the external faults mainly comprise a switch, a sensor, an executing mechanism and the like of the screw compressor, and the visible quantity is obtained; the internal fault is relatively complex, the switching value is only in two states of closing and opening, but the user is not professional enough after all, the terminal position of the switching value is not well defined and the initial state is not familiar, and analysis, judgment and even solution are difficult to carry out; for analog quantity, it is difficult to distinguish the analog quantity without special equipment or software, and the user is even more unopposed. As a result, a significant challenge is presented: how to let screw compressor more intelligent, possess self-diagnosis ability, can let the user possess better experience, also can play the early warning effect simultaneously, early diagnosis, early discovery, early maintenance for screw compressor operation is safer, more high-efficient.
Disclosure of Invention
Accordingly, in order to address the above-described deficiencies, the present invention herein provides a screw compressor controller self-diagnostic system.
The invention is realized by constructing a self-diagnosis system of a screw compressor controller, the device comprises a screw compressor and a controller, the screw compressor comprises remote start-stop, three-filter pressure difference, switching value input such as a sudden stop button and the like, temperature sensor and the like, analog quantity input such as a pressure sensor and the like, the output of switching value such as a contactor, an electromagnetic valve, operation/fault and the like and the output of analog quantities such as current, temperature and pressure and the like are required to be controlled, and the controller realizes the output of related switching value and analog quantity according to the process logic of the screw compressor, the input switching value and the acquired analog quantity input; when the screw compressor is electrified or overhauled before running, the controller can simulate the input of the switching value and the analog quantity, then compare the switching value and the analog quantity output of the simulation result with the logic output according to the process requirement of the screw compressor and the determined control logic, and judge whether the function of the controller is normal, thereby realizing the self-diagnosis of the controller, knowing or assisting to be familiar with the real-time condition of the controller in advance, and maintaining the controller timely so as not to influence the running of the screw compressor.
Preferably, the working mode is as follows:
S1, when the controller is electrified or overhauled before the screw compressor runs, carrying out simulation operation, namely forced closing and forced opening, on the input of the switching value one by one in sequence, and respectively monitoring simulation change of the input state according to the process requirement of the screw compressor and the determined control logic so as to judge whether the input work of each switching value of the controller is normal;
S2, when the controller is electrified or overhauled before the screw compressor runs, simulation operation, namely forced input and forced zero return, is carried out on the input of analog quantity one by one in sequence, and simulation change of an input result is monitored respectively according to the process requirement of the screw compressor and the determined control logic, so that whether the input of each analog quantity of the controller is normal or not is judged;
s3, when the controller is electrified or overhauled before the screw compressor runs, the output of the switching value is subjected to simulation operation, namely forced closing and forced opening, one by one in sequence, and then the simulation change of the output state is respectively monitored according to the process requirements of the screw compressor and the determined control logic, so that whether each output of the controller is normal or not is judged;
And S4, when the controller is electrified or overhauled before the screw compressor runs, carrying out simulation operation, namely forced output and forced return to zero, on the output of the analog quantity one by one in sequence, and respectively monitoring simulation change of an output result according to the process requirement of the screw compressor and the determined control logic, so as to judge whether each output of the controller is normal.
The invention has the following advantages: the present invention provides a screw compressor controller self-diagnostic system by improvement herein, with the following improvements over the same type of equipment:
The advantages are that: the invention relates to a self-diagnosis system of a screw compressor controller, which mainly comprises a screw compressor and a controller, wherein the screw compressor is used as equipment, and comprises switching value inputs such as remote start and stop, three-filter pressure difference, emergency stop buttons and the like, analog quantity inputs such as a temperature sensor, a pressure sensor and the like, switching value outputs such as a contactor, an electromagnetic valve, operation/fault and the like and analog quantity outputs such as current, temperature, pressure and the like; when the screw compressor is electrified or overhauled before running, the controller can simulate the input of the switching value and the analog value one by one according to the process requirement of the screw compressor and the determined control logic, and compare the switching value and the analog value output of the simulation result with the logic output, thereby realizing the self-diagnosis of the controller, knowing or assisting to be familiar with the real-time condition of the controller in advance, and maintaining the controller timely so as not to influence the running of the screw compressor.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a flow chart of the controller self-diagnosis system in the present invention.
Wherein: screw compressor-11, controller-12.
Detailed Description
The following detailed description of the present invention, taken in conjunction with fig. 1-2, clearly and completely describes the technical solutions of embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the invention provides a screw compressor controller self-diagnosis system by improving the system, which comprises a screw compressor 11 and a controller 12, wherein the screw compressor 11 comprises remote start-stop, three-filter pressure difference, switching value input such as a scram button, analog value input such as a temperature sensor and a pressure sensor, and the like, and needs to control switching value output such as a contactor, an electromagnetic valve, operation/fault and the like and analog value output such as current, temperature and pressure and the like, and the controller 12 realizes output of related switching value and analog value according to screw compressor process logic and input switching value and acquired analog value input; when the screw compressor is electrified or overhauled before running, the controller can simulate the input of the switching value and the analog quantity, then compare the switching value and the analog quantity output of the simulation result with the logic output according to the process requirement of the screw compressor and the determined control logic, and judge whether the function of the controller is normal, thereby realizing the self-diagnosis of the controller, knowing or assisting to be familiar with the real-time condition of the controller in advance, and maintaining the controller timely so as not to influence the running of the screw compressor.
As shown in fig. 2, the operation mode is as follows:
S1, when the controller 12 is electrified or overhauled before the screw compressor 11 runs, carrying out simulation operation, namely forced closing and forced opening, on the input of the switching value one by one in sequence, and respectively monitoring simulation change of the input state according to the process requirement of the screw compressor and the determined control logic so as to judge whether the input work of each switching value of the controller is normal or not, and if the input work is not changed, the controller fails;
s2, when the controller 12 is electrified or overhauled before the screw compressor 11 runs, simulation operation, namely forced input and forced zero return, is carried out on the input of analog quantity one by one in sequence, simulation change of an input result is monitored respectively according to the process requirement of the screw compressor and the determined control logic, so that whether each analog quantity input of the controller is normal or not is judged, and if no change exists, the controller fails;
S3, when the controller 12 is electrified or overhauled before the screw compressor 11 runs, the output of the switching value is subjected to simulation operation, namely forced closing and forced opening, one by one in sequence, and then the simulation change of the output state is respectively monitored according to the process requirement of the screw compressor and the determined control logic, so that whether each output of the controller is normal or not is judged, and if the output is not changed, the controller fails;
And S4, when the controller 12 is electrified or overhauled before the screw compressor 11 runs, the analog output is sequentially subjected to simulation operation, namely forced output and forced return to zero, and then simulation changes of output results are respectively monitored according to the process requirements of the screw compressor and the determined control logic, so that whether each output of the controller is normal or not is judged, and if the output is not changed, the controller fails.
The invention provides a screw compressor controller self-diagnosis system through improvement, which mainly comprises a screw compressor 11 and a controller 12, wherein the screw compressor 11 comprises remote start-stop, three-filter pressure difference, switching value input such as an emergency stop button and the like, temperature sensor and analog quantity input such as a pressure sensor and the like, the switching value output such as a contactor, an electromagnetic valve, operation/fault and the like and the analog quantity output such as current, temperature and pressure and the like are required to be controlled, and the controller 12 realizes the output of related switching value and analog quantity according to the screw compressor process logic, the input switching value and the acquired analog quantity input; when the screw compressor is electrified or overhauled before running, the controller can simulate the input of the switching value and the analog value one by one according to the process requirement of the screw compressor and the determined control logic, and compare the switching value and the analog value output of the simulation result with the logic output, thereby realizing the self-diagnosis of the controller, knowing or assisting to be familiar with the real-time condition of the controller in advance, and maintaining the controller timely so as not to influence the running of the screw compressor.
The basic principle and main characteristics of the invention and the advantages of the invention are shown and described above, standard parts used by the invention can be purchased from market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of the parts adopt conventional means such as mature bolt rivets and welding in the prior art, the machinery, the parts and the equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that the description is omitted.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (1)

1.一种螺杆压缩机控制器自诊断系统，其特征在于：包括螺杆压缩机（11）和控制器（12），所述螺杆压缩机（11）的开关量输入包含远程启停、三滤压差、急停按钮，所述螺杆压缩机（11）的模拟量输入包含温度传感器、压力传感器，所述螺杆压缩机（11）的开关量输出包含接触器、电磁阀的控制和运行/故障状态的控制，所述螺杆压缩机（11）的模拟量输出包含电流、温度、压力，所述控制器（12）依据螺杆压缩机工艺逻辑与输入的开关量和采集的模拟量输入，实现对相关开关量与模拟量的输出；螺杆压缩机运行前上电或检修时，控制器对开关量和模拟量的输入进行仿真，再依据螺杆压缩机工艺要求和确定的控制逻辑，对仿真结果的开关量和模拟量输出分别与逻辑输出做比对，判断控制器功能是否正常，由此实现控制器的自诊断；1. A screw compressor controller self-diagnosis system, characterized in that it comprises a screw compressor (11) and a controller (12), wherein the switch quantity input of the screw compressor (11) comprises remote start and stop, three-filter pressure difference, and emergency stop button, the analog quantity input of the screw compressor (11) comprises a temperature sensor and a pressure sensor, the switch quantity output of the screw compressor (11) comprises control of a contactor and a solenoid valve and control of an operation/fault state, the analog quantity output of the screw compressor (11) comprises current, temperature, and pressure, and the controller (12) realizes output of related switch quantities and analog quantities according to the process logic of the screw compressor and the input switch quantity and the collected analog quantity input; when the screw compressor is powered on before operation or under maintenance, the controller simulates the input of the switch quantity and analog quantity, and then compares the switch quantity and analog quantity output of the simulation result with the logic output according to the process requirements of the screw compressor and the determined control logic, and judges whether the controller function is normal, thereby realizing self-diagnosis of the controller; 螺杆压缩机控制器自诊断系统的工作方式如下：The screw compressor controller self-diagnosis system works as follows: S1、所述控制器（12）在螺杆压缩机（11）运行前上电或检修时，对开关量的输入按顺序逐个进行仿真操作---强制闭合再强制断开，再依据螺杆压缩机工艺要求和确定的控制逻辑，分别监控输入状态的仿真变化，以此判别控制器每个开关量输入是否正常；S1, when the screw compressor (11) is powered on or overhauled before operation, the controller (12) simulates the input of the switch quantity one by one in sequence - forced closing and then forced opening, and then monitors the simulated changes of the input state according to the process requirements of the screw compressor and the determined control logic, so as to judge whether each switch quantity input of the controller is normal; S2、所述控制器（12）在螺杆压缩机（11）运行前上电或检修时，对模拟量的输入按顺序逐个进行仿真操作---强制输入再强制归零，再依据螺杆压缩机工艺要求和确定的控制逻辑，分别监控输入结果的仿真变化，以此判别控制器每个模拟量输入是否正常；S2, when the screw compressor (11) is powered on or overhauled before operation, the controller (12) performs simulation operations on the analog inputs one by one in sequence - forced input and then forced reset to zero, and then monitors the simulation changes of the input results respectively according to the process requirements of the screw compressor and the determined control logic, so as to determine whether each analog input of the controller is normal; S3、所述控制器（12）在螺杆压缩机（11）运行前上电或检修时，对开关量的输出按顺序逐个进行仿真操作---强制闭合再强制断开，再依据螺杆压缩机工艺要求和确定的控制逻辑，分别监控输出状态的仿真变化，以此判别控制器每个开关量输出是否正常；S3, when the screw compressor (11) is powered on or overhauled before operation, the controller (12) simulates the output of the switch quantity one by one in sequence - forced closing and then forced opening, and then monitors the simulated changes of the output state according to the process requirements of the screw compressor and the determined control logic, so as to judge whether each switch quantity output of the controller is normal; S4、所述控制器（12）在螺杆压缩机（11）运行前上电或检修时，对模拟量的输出按顺序逐个进行仿真操作---强制输出再强制归零，再依据螺杆压缩机工艺要求和确定的控制逻辑，分别监控输出结果的仿真变化，以此判别控制器每个模拟量输出是否正常。S4. When the screw compressor (11) is powered on or overhauled before operation, the controller (12) performs simulation operations on the output of the analog quantity one by one in sequence - forcing the output and then forcing it to return to zero, and then monitors the simulation changes of the output results respectively according to the process requirements of the screw compressor and the determined control logic, so as to determine whether each analog quantity output of the controller is normal.
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