Interlocking jump stop method for instantaneous rise or instantaneous drop of equipment operation current

Abstract

The invention discloses an equipment operation current instantaneous rise or instantaneous drop interlocking jump stop method, and relates to the technical field of industrial automation control. After an equipment driver is sent out and after the set time of an equipment starting time limit, a function block begins to compare and analyze a real-time value of a current input actual value and a value before one second; when the change value which is increased instantaneously exceeds the current instantaneous exceeding amplitude value, fault output interlocking is automatically output under the condition of interlocking input; in the normal operation process of equipment, a real-time value of a current input actual value and a current rated reference value are compared and analyzed at any time, and when the current actual value is lower than a current instantaneous drop amplitude value, fault output interlocking is automatically output under the condition of interlocking input. By monitoring the running current of the equipment in real time and automatically performing interlocking tripping, equipment damage or production accidents caused by abnormal fluctuation of the current are effectively avoided. The device is ensured to operate in a safe current range, and the operation stability and the production efficiency of the device are improved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial automation control, and in particular to a method for interlocking and tripping equipment when the running current rises or falls instantaneously. Background Art

[0002] There are many production line equipment, including many belts and bucket elevators for material transportation. Special circumstances during the operation of belts and bucket elevators will cause abnormal current fluctuations. For example, if the belt or bucket elevator breaks, or the motor or reducer output shaft breaks, the current will drop below the no-load current; sudden material pressing or locking of motor bearings and reducer bearings will cause the current to suddenly increase a lot. If the operator fails to discover it in time, it may cause serious consequences to the equipment and the personal safety of the personnel on duty.

[0003] Therefore, a method for interlocking and stopping the equipment when the operating current rises or falls instantly becomes a problem that needs to be solved urgently. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for interlocking and stopping the equipment when the running current rises or falls instantly. The collected current signals are compared before and after. When it is found that the current exceeds a certain value instantly or drops a certain value instantly, the equipment is interlocked and stopped.

[0005] In order to solve the above technical problems, the present invention provides a technical solution: a method for interlocking and tripping when the running current of an equipment increases or decreases instantaneously, comprising the following steps:

[0006] After the device driver is issued, after the set time of the device startup time limit, the function block starts to compare and analyze the real-time value of the actual current input value with the value 1 second ago. When the actual current value exceeds the current instantaneous rise input value, the function block comparison logic automatically controls; when the instantaneous rise change value exceeds the current instantaneous excess amplitude value, the fault output interlock is automatically output when the interlock is turned on;

[0007] When the equipment is operating normally, that is, no parking drive is sent, the real-time value of the actual current input value is compared and analyzed with the rated reference value of the current at any time. When the actual current value is lower than the current instantaneous drop amplitude value, the fault output interlock is automatically output when the interlock is enabled.

[0008] Furthermore, after the current transient overshoot and current transient undershoot cause the fault output interlock output, the operator can only operate again after confirming the fault and resetting it.

[0009] Furthermore, within the set time limit for starting the device, the function block suspends the comparison and analysis operation on the current.

[0010] Furthermore, a filtering algorithm is used to pre-process the actual value of the current input to filter out electromagnetic interference noise signals.

[0011] Furthermore, a warning is issued for instantaneous current rise or fall, and when the current change value approaches but does not reach the threshold value for triggering an interlock trip, a warning signal is sent to the operator in advance.

[0012] Furthermore, detailed information of each current transient rise or drop interlock tripping event is recorded, including the time of occurrence, current change value, and equipment operating status, to form an event log.

[0013] The advantages of the present invention compared with the prior art are:

[0014] 1. By real-time monitoring of the equipment's operating current and automatic interlocking and tripping, equipment damage or production accidents caused by abnormal current fluctuations can be effectively avoided.

[0015] 2. Ensure that the equipment operates within a safe current range, improving the equipment's operating stability and production efficiency.

[0016] 3. The fault handling and reset process is simple and clear, which makes it easy for operators to respond and handle faults quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a parameter definition interface of the variable name, type and the like of a method for interlocking and stopping a device when the running current of the device rises or falls instantly according to the present invention.

[0018] Figure 2 The present invention discloses a functional block configuration control panel diagram of a method for interlocking and stopping a device when the running current of the device rises or falls instantly.

[0019] Figure 3 It is a functional block operator panel diagram of a method for interlocking and stopping a device when the running current rises or falls instantly according to the present invention.

[0020] Figure 4 It is a function realization logic relationship diagram of a method for interlocking and stopping a device when the running current rises or falls instantly according to the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be understood that in the description of the present application, unless the context clearly requires otherwise, words such as "include", "comprises", and the like in the entire specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, the meaning of "including but not limited to".

[0023] It should be noted that the terms "S1", "S2", etc. are only used for the purpose of describing the steps, and do not specifically refer to the order or sequence, nor are they used to limit the present application. They are only for the convenience of describing the method of the present application, and cannot be understood as indicating the order of the steps. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0024] The following is a further detailed description of a method for interlocking and stopping a device when the operating current rises or falls instantaneously in accordance with the present invention in conjunction with the accompanying drawings.

[0025] Combined with Figure 1-4 , the present invention is introduced in detail.

[0026] 1. Equipment startup phase:

[0027] After the device drive command is issued, after the set device startup time limit (ST1), the function block officially starts the real-time monitoring and analysis process of the actual current input value (IN). Specifically, the function block compares the real-time value of IN with the historical value 1 second ago. When the actual value of the current exceeds the preset current transient rise input value (SET4), the comparison logic inside the function block is automatically activated and begins to execute the corresponding control strategy. If the instantaneous current change value exceeds the set current transient excess amplitude value (SET1) at this time, and the interlocking function is in the input state, the system automatically outputs the fault output interlocking (LS) signal, thereby realizing the rapid interlocking trip protection of the equipment, effectively avoiding serious faults such as overheating and burning of the equipment caused by excessive current.

[0028] 2. Normal operation stage of equipment:

[0029] During normal operation of the equipment, that is, when no stop drive command is received, the function block always maintains real-time monitoring of the actual value of the current input (IN), and continuously compares and analyzes the real-time value of IN with the rated reference value of the current (SET3). Once the actual value of the current is detected to be lower than the preset current drop amplitude value (SET2), and the interlock function is in the on state, the system will also automatically output the fault output interlock (LS) signal to prompt the equipment to stop running immediately. This mechanism can promptly respond to abnormal conditions such as the breakage of the equipment transmission parts that cause a sudden drop in current, prevent the equipment from continuing to idle under no-load or low-load conditions, and avoid possible secondary accidents such as material spillage and equipment collision.

[0030] 3. Fault confirmation and reset mechanism:

[0031] When the current transient overshoot or dip causes the fault output interlock (LS) signal to be output, the device will enter a locked state. At this point, the operator needs to carefully confirm the fault and manually perform a reset operation. Only after completing the above fault handling process can the device be restarted and resume normal operation. This mechanism effectively ensures that faults can be promptly identified and handled, avoiding further expansion of potential risks caused by blindly restarting the device due to unresolved faults.

[0032] 4. Operations suspended within the startup time limit:

[0033] During the time set by the device startup time limit (ST1), the function block will suspend the current comparison and analysis operation. This is because during the startup process of the device, the current usually goes through a transition phase from the startup current to the normal working current, during which the current fluctuation is large and is normal. By suspending the comparison and analysis within the startup time limit, the interlock tripping mechanism can be effectively avoided from being triggered by the startup current fluctuation, thus improving the stability and reliability of the system.

[0034] 5. Electromagnetic interference suppression:

[0035] Considering the complex industrial field environment and the presence of a large number of electromagnetic interference signals, the present invention uses an advanced filtering algorithm to pre-process the actual value of the current input (IN). The filtering algorithm can accurately filter out electromagnetic interference noise signals, ensure that the current signal of the input function block is true and reliable, thereby improving the accuracy of current monitoring and comparative analysis, and reducing the occurrence of misjudgments caused by interference signals.

[0036] 6. Early warning function:

[0037] In order to further improve the intelligence level and fault prevention ability of the system, the present invention adds a warning function for instantaneous current rise or drop. When the current change value is close to but has not reached the threshold value that triggers the interlock tripping, the system will send a warning signal to the operator in advance. After receiving the warning, the operator can check and adjust the equipment operation status in time, and take corresponding preventive measures in advance, such as adjusting the material flow, checking the equipment transmission components, etc., so as to effectively avoid the occurrence of faults, reduce equipment downtime, and improve production efficiency.

[0038] 7. Event log records:

[0039] The system has a complete event log recording function, which can record in detail the key information of each current instantaneous rise or drop interlock trip event. Specifically, it includes important parameters such as the exact time of the event, the current change value, and the equipment operation status. These records not only provide valuable data support for subsequent fault analysis and troubleshooting, helping technicians quickly locate the root cause of the problem and develop targeted solutions, but also help companies conduct long-term statistical analysis and performance evaluation of equipment operation status, providing a strong basis for equipment maintenance, upgrades, and production process optimization.

[0040] The specific implementation process of the method for interlocking and stopping the equipment when the running current rises or falls instantly in the present invention is as follows:

[0041] After the device driver is issued, after the set time of ST1 (device startup time limit), the function block starts to compare and analyze the real-time value of IN (actual current input value) with the value 1 second ago. When the actual value of the current exceeds SET4 (instantaneous current rise input value), the function block comparison logic automatically controls. When the instantaneous increase in the change value exceeds SET1 (instantaneous current excess amplitude value), LS (fault output interlock) is automatically output when the interlock is put into use.

[0042] When the equipment is operating normally, that is, no parking drive is sent, the real-time value of IN (actual current input value) is compared and analyzed with SET3 (rated current reference value) at any time. When the actual current value is lower than SET2 (current instantaneous drop amplitude value), LS (fault output interlock) is automatically output when the interlock is enabled.

[0043] After the current transient overshoot and current transient undershoot cause the LS (fault output interlock) output, the operator needs to confirm the fault and reset it before the operation can be performed again.

[0044] The variable annotations are shown in Table 1.

[0045] Table 1: Variable annotation table

[0046]

[0047] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A method for interlocking and stopping equipment when the running current rises or falls instantly, characterized in that: The following steps are included: After the device driver is issued, after the set time of the device startup time limit, the function block starts to compare and analyze the real-time value of the actual current input value with the value 1 second ago. When the actual current value exceeds the current instantaneous rise input value, the function block comparison logic automatically controls; when the instantaneous rise change value exceeds the current instantaneous excess amplitude value, the fault output interlock is automatically output when the interlock is turned on; When the equipment is operating normally, that is, no parking drive is sent, the real-time value of the actual current input value is compared and analyzed with the rated reference value of the current at any time. When the actual current value is lower than the current instantaneous drop amplitude value, the fault output interlock is automatically output when the interlock is enabled.

2. The method for interlocking and stopping equipment when the running current rises or falls instantly according to claim 1, characterized in that: After the current transient overshoot and current transient undershoot cause the fault output interlock output, the operator can only operate again after confirming the fault and resetting it.

3. The method for interlocking and stopping equipment when the equipment operating current rises or falls instantly according to claim 2, characterized in that: During the equipment startup time limit setting time, the function block suspends the current comparison and analysis operation.

4. The method for interlocking and stopping equipment when the equipment runs at a current that rises or falls instantly according to claim 3, characterized in that: The actual value of the current input is preprocessed using a filtering algorithm to filter out electromagnetic interference noise signals.

5. The method for interlocking and stopping equipment when the running current rises or falls instantly according to claim 4, characterized in that: When the current changes close to but does not reach the threshold that triggers the interlock tripping, a warning signal is sent to the operator in advance.

6. The method for interlocking and stopping equipment when the running current rises or falls instantly according to claim 5, characterized in that: Record detailed information of each current transient rise or drop interlock trip event, including the time of occurrence, current change value, and equipment operating status, to form an event log.

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