CN115523173A - Simple control method for interlocking temperature of running fan with filtering decoupling protection function - Google Patents

Abstract

The invention discloses a simple control method for interlocking temperature of a running fan with filtering decoupling protection, which comprises the following steps: and (1) starting a timer. (2) Acquiring signal change, and dividing the signal state into two types of 1 and 0. And (3) acquiring a measured temperature value through online real-time monitoring. The simple interlocking temperature algorithm for the running fan with the filtering decoupling protection function can effectively eliminate the problems that the fan does not need to be stopped and is also stopped in the production process due to signal interference and decoupling, the production is influenced, the labor intensity is greatly reduced, and the production efficiency is improved.

Description

Simple control method for interlocking temperature of running fan with filtering decoupling protection function

Technical Field

The invention relates to the technical field of measurement algorithms for thermocouple temperature of fan interlocking protection, in particular to a simple method for controlling the interlocking temperature of an operating fan with filtering decoupling protection.

Background

Under the condition that a large fan rotates at a high speed for a long time, if a lubricating system fails and mechanical fasteners are loosened, the temperature of a stator and a rotor of a fan motor can be gradually increased, and the change trend of the temperature along with time is shown in an attached drawing 1.

When the change tends to reach the interlocking stop point, the fan must be normally stopped, otherwise the fan can cause serious damage, and major equipment failure is caused, the fan measurement and control and the interlocking point are normally designed, and more than 30 points are arranged on each fan. The decoupling is a physical fault, namely a non-fan fault, of a detection component, and is characterized in that an abnormal electrical fault signal is sent out accidentally on the electrical characteristic, the temperature is reported to the system to reach the maximum value, and the electrical characteristic is shown in fig. 2.

According to normal requirements, the system can only give an alarm and cannot be shut down when the phenomenon occurs, the alarm reminds field personnel to check and confirm and inform related technical personnel to process, but the system can be shut down when the phenomenon occurs in the original design, and the production and the gas recovery of the converter are directly influenced. Belongs to the design defect and needs to be improved and perfected. Through perfecting the control program, a good decoupling protection program is researched to prevent the fan from stopping due to the conditions so as to avoid unnecessary production accidents.

In the production operation process of many large and medium-sized fans of companies, accidents such as shutdown caused by temperature measured by thermocouples occur continuously, wherein peak signal shutdown is caused by signal interference, and abnormal shutdown caused by decoupling is more.

Aiming at the problems, innovative design is urgently needed on the basis of the original simple and easy operating fan interlocking temperature algorithm with filtering decoupling protection.

Disclosure of Invention

The invention aims to provide a simple control method for interlocking temperature of an operating fan with filtering decoupling protection, which aims to solve the problems that the accident shutdown is caused by the temperature measured by a thermocouple in the background art, wherein the peak signal shutdown and the decoupling are caused by signal interference to generate the phenomenon of abnormal shutdown.

In order to achieve the purpose, the invention provides the following technical scheme: a simple control method for interlocking temperature of an operating fan with filtering decoupling protection comprises the following steps:

(1) And starting a timer.

(2) Acquiring signal change, and dividing the signal state into two types of 1 and 0.

(3) And acquiring a measured temperature value through online real-time monitoring.

Preferably, the starting timer in S1 depends on S _ ODT.

Preferably, the signal change in (1) and (2) is always a necessary condition for enabling the timer, and as long as the signal state of the input terminal S is positive, the timer is operated at a time interval specified at the input terminal TV, the timer reaches a specified time without error, and the signal state of the S input terminal is still "1", the signal state of the output terminal Q is "1", and if the signal state of the input terminal S changes from "1" to "0" during the timer operation, the timer will stop, in which case the signal state of the output terminal Q is "0".

Preferably, in the above (1) and (2), the reset (R) input changes from "0" to "1" during the timer operation, the timer is reset, and the current time and the time reference are set to zero. Then, the signal state of the output terminal Q becomes "0". If the R input has a logic "1" and RLO at input S is "1" while the timer is not running, the timer is also reset.

Preferably, when the measured temperature value is greater than the alarm set value in the step (3), the system outputs an alarm signal, and the alarm block is also provided with a silencing reset button.

Preferably, in the step (3), when the measured temperature value is greater than the alarm set value, is greater than the interlock shutdown set value, and the holding time exceeds the filtering time, the system sends a shutdown command, automatically cuts off a main power supply of the loop, and protects the motor from shutdown.

Preferably, in the step (3), when the measured temperature value is greater than the alarm set value, greater than the interlock shutdown set value, and greater than or equal to the temperature range, the system sends out a decoupling protection command to prevent the motor from shutdown. The meter signal shows a maximum, i.e., range value, when the conventional system is decoupled.

Compared with the prior art, the invention has the beneficial effects that: the problem that the production is influenced because the fan does not need to be stopped in the production process due to signal interference and decoupling can be effectively solved, the labor intensity of workers is greatly reduced, and the production efficiency is improved.

Drawings

FIG. 1 is a schematic diagram showing the temperature trend of the present invention with time;

FIG. 2 is a schematic view of the electrical characteristics of the present invention;

FIG. 3 is a schematic diagram of the control logic of the present invention;

FIG. 4 is a timing diagram of the S _ ODT functional block according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 3-4, the present invention provides a simple method for controlling interlocking temperature of a running fan with filtering decoupling protection, comprising the following steps:

(1) And starting a timer.

(2) Acquiring signal change, and dividing the signal state into two types of 1 and 0.

(3) And acquiring a measured temperature value through online real-time monitoring.

If there is a rising edge at the start (S) input, the S _ ODT will start a timer. The signal change is always a necessary condition for enabling the timer. As long as the signal state at input S is positive, the timer runs at the time interval specified at input TV. The signal state at the output Q is "1" when the timer reaches a specified time without error and the signal state at the S input remains "1". If the signal state at the input S changes from "1" to "0" during the timer running, the timer will stop. In this case, the signal state of the output terminal Q is "0".

If the reset (R) input changes from "0" to "1" during the timer running, the timer is reset. The current time and the time reference are set to zero. Then, the signal state of the output terminal Q becomes "0". If the R input has a logic "1" and RLO at input S is "1" while the timer is not running, the timer is also reset.

CMP > R is a real comparison function block, and the output is '1' when IN1> IN2, the line is through.

CMP > = R is a real-type comparison functional block, and when IN1> = IN2, the output is "1", and the line is on.

The logic diagram has the functions of:

when the measured temperature value is larger than the alarm set value, the system outputs an alarm signal, and the alarm block is also provided with a silencing reset button;

when the measured temperature value is greater than the alarm set value and greater than the interlock shutdown set value and the holding time exceeds the filtering time (in the case of 2 seconds, the design is better within 5 seconds), the system sends a shutdown command, automatically cuts off a main power supply of a loop and protects the motor from shutdown;

when the signal is interfered, instantaneous peak signal is generated, the peak signal is not frequent, the expression form is occasionally appeared, the duration is only one or two cycle durations of a scanning cycle of a CPU system, one scanning cycle is only a few seconds or tens of milliseconds, and a large system has one or two hundred milliseconds, so the filtering time is slightly larger than the maximum duration of the peak value, and the filtering time is ideal. The filtering time is determined according to a specific system, and the result can be accessed by operating the system, and the filtering time is 2 seconds in the case, so that the filtering method is ideal to be applied in the company.

When the measured temperature value is greater than the alarm set value, greater than the interlock shutdown set value and greater than or equal to the temperature range, the system sends out a decoupling protection command to prevent the motor from shutdown. The meter signal shows a maximum, i.e., range value, when the conventional system is decoupled.

The button is operated for starting the system, generally a pulse signal, namely the button is pressed to be switched on at a high level, and the button is released to be switched off at a low level; the start button comprises automatic and manual start commands;

the motor can keep running after a start button is released for self-locking a signal after starting;

for interlocking the automatic stop signal, a normally closed point signal is adopted, when the signal pulse is in a high level, the motor is stopped and output,

when the power is lost, the motor is stopped for low power evaluation;

when the interlock stop command comes, but the interlock stop command is judged to be the decoupling reason, the motor is protected from stopping and continues to operate.

The function description is only to the measurement of single-point temperature, control description, and fan system interlock temperature point is including: the temperature of the front shaft of the motor, the temperature of the rear shaft of the motor, the temperature of the front shaft of the fan, the temperature of the rear shaft of the fan and the measurement control of all the temperatures are all suitable for the functional algorithm.

Those not described in detail in this specification are within the skill of the art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A simple control method for interlocking temperature of an operating fan with filtering decoupling protection is characterized by comprising the following steps:

(1) And starting a timer.

(2) And acquiring signal change, wherein the signal state is divided into two types of 1 and 0.

(3) And acquiring a measured temperature value through online real-time monitoring.

2. The simple temperature control method for the running fan interlocking with the filtering decoupling protection as claimed in claim 1, wherein the simple temperature control method comprises the following steps: the start timer in (1) relies on the S _ ODT.

3. The simple temperature control method for the running fan interlocking with the filtering decoupling protection as claimed in claim 1, wherein the simple temperature control method comprises the following steps: the signal change in (1) and (2) is always a necessary condition for starting the timer, and as long as the signal state of the input terminal S is positive, the timer is operated at a time interval specified at the input terminal TV, the timer reaches a specified time without error, and when the signal state of the S input terminal is still "1", the signal state of the output terminal Q is "1", and if the signal state of the input terminal S changes from "1" to "0" during the timer operation, the timer will stop, in which case the signal state of the output terminal Q is "0".

4. The simple temperature control method for the running fan interlocking with the filtering decoupling protection as claimed in claim 1, wherein the simple temperature control method comprises the following steps: in the above (1) and (2), the reset (R) input changes from "0" to "1" during the timer operation, the timer is reset, and the current time and the time reference are set to zero. Then, the signal state of the output terminal Q becomes "0". If the R input has a logic "1" and RLO at input S is "1" while the timer is not running, the timer is also reset.

5. The simple temperature control method for the running fan interlocking with the filtering decoupling protection as claimed in claim 1, wherein the simple temperature control method comprises the following steps: and (3) when the measured temperature value is greater than the alarm set value, the system outputs an alarm signal, and the alarm block is also provided with a silencing reset button.

6. The simple temperature control method for the running fan interlocking with the filtering decoupling protection as claimed in claim 1, wherein the simple temperature control method comprises the following steps: and (3) when the measured temperature value is greater than the alarm set value, is greater than the interlock shutdown set value and the holding time exceeds the filtering time, the system sends a shutdown command, automatically cuts off a main power supply of the loop, and protects the motor from shutdown.

7. The simple temperature control method for the running fan interlocking with the filtering decoupling protection as claimed in claim 1, wherein the simple temperature control method comprises the following steps: and in the step (3), when the measured temperature value is greater than the alarm set value, greater than the interlock shutdown set value and greater than or equal to the temperature range, the system sends out a decoupling protection command to prevent the motor from being shut down. The meter signal is shown as the maximum, i.e., range value, when the conventional system is decoupled.

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