KR100916563B1 - realtime monitoring device for output voltage of AVR - Google Patents

Abstract

The present invention provides a control power supply to the Hydraulic Roll Positioning Device (HYROP) for controlling the thickness of the strip through the roll-up control of the push-up (Roll Gap) in the cold rolling equipment The present invention relates to an automatic voltage reduction regulator (AVR) output voltage real-time monitoring device for a hydraulic pressure reduction system that prevents a failure of control and prolonged production stop due to an error of the automatic voltage regulator (AVR).

A DC power supply unit (DEU: DC power supply unit) provided in a hydraulic roll positioning device (HYROP) control panel and having an automatic voltage regulator (AVR: Automatic Voltage Regulator) for supplying control power of the hydraulic reduction system. Supply Unit);

Automatic voltage regulator (AVR) output power monitoring unit detects the output voltage of the automatic voltage regulator (AVR) and transmits analog and digital data in real time to self-protection and higher power line communication (PLC). ;

A control unit (CTU) for receiving internal direct current (DC) power from the DC power supply unit (DEU) to perform internal control of the hydraulic pressure reduction system (HYROP);

A sequence unit (SCU) that receives direct current (DC) power from the DC power supply unit (DEU) and is in charge of interfacing with an external device;

Printed with DC (Direct Current) power from the DC Power Supply Unit (DEU) and equipped with CPU (CPU) Central Processing Unit (CPU) and Analog and Digital I / O (PCB) Printed Circuit Board (PCB) A printed circuit board unit (PIU);

Commands operation to the hydraulic pressure reduction system (HYROP) and monitors the operation result in real time, and whether the cold rolling mill is operated based on the result detected by the automatic voltage regulator (AVR) output power monitoring unit of the hydraulic pressure reduction system (HYROP). Upper power line communication (PLC) to determine the power supply;

A serial transfer unit (STU) embedded in the hydraulic pressure reduction system (HYROP) and the upper power line communication (PLC) to perform serial communication with each other; And

And a human machine interface (HMI) for monitoring and manipulating the cold rolling mill provided from the upper power line communication (PLC) and the hydraulic pressure reduction system (HYROP) operation information.

Hydraulic Pressure Reduction System, HYROP, Automatic Voltage Reciprocator (AVR) Output Voltage Monitor, DC Power Supply Unit (DEU), Monitoring, Thickness Control

Description

Realtime monitoring device for output voltage of AVR             

1 is a block diagram of a automatic voltage regulator (AVR) output voltage real-time monitoring device for a hydraulic pressure reduction system according to the prior art.

2 is a control relay operation characteristic diagram of FIG.

Figure 3 is an overall configuration diagram of an automatic voltage regulator (AVR) output voltage real-time monitoring device for a hydraulic pressure reduction system according to the present invention.

4A to 4C are detailed configuration diagrams of FIG. 3.

5 is an operation characteristic diagram of the DC undervoltage relay of FIG. 4A;

           ** Description of the symbols for the main parts of the drawings **

10: DC Power Supply Unit (DEU)
20: Automatic voltage regulator (AVR) output power monitor
30: control unit (CTU)
40: sequence unit (SCU)

50: printed circuit board unit (PIU)
60: upper power line communication (PLC)
70: serial transfer unit (STU)
80: load cell panel

90: interface unit (INF)
100: power amplifier (P-Amp)
110: Magni scale unit (MSU)
120: human machine interface (HMI)

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a real-time monitoring device for an automatic voltage reduction regulator (AVR) output voltage for a hydraulic pressure reduction system. (Strip) To prevent poor control and prolonged production stop due to the error of the automatic voltage regulator (AVR) that supplies the control power to the hydraulic pressure reducing system (hereinafter referred to as HYROP: Hydraulic Roll Positioning Device). It relates to an automatic voltage regulator (AVR) output voltage real-time monitoring device for a hydraulic pressure reduction system.

More specifically, the hydraulic pressure reduction system (HYROP), which is mainly used as a reduction control system in cold rolling mills and skin pass mills (SPM), as well as switching mode power supply (SMPS) for commercial power supply. For the purpose of stabilizing equipment through switching mode power supply (SMPS) status monitoring to various control systems such as Power Line Communication (PLC), Distribution Control System (DCS), Inverter, etc. The present invention relates to an automatic voltage regulator (AVR) output voltage real-time monitoring device for a hydraulic pressure reduction system.

In general, the hydraulic pressure reduction system (HYROP) automatic voltage factor regulator (AVR) is a type of switching mode power supply (SMPS) to which alternating current (AC) is applied, and deteriorates electrolytic capacitor due to the characteristics of the switching mode power supply (SMPS). (The life of electrolytic capacitor is generally reported as 5 ~ 7 years) The possibility of output voltage abnormality is very high, and thickness control abnormality and poor quality are caused by the automatic voltage retarder (AVR) output voltage drop during actual cold rolling. It is causing.

As shown in FIG. 1, a hydraulic pressure reduction system (HYROP) automatic voltage regulator (AVR) is named as a DC power supply unit (DEU) and is located inside the DC power supply unit (DEU). There are four automatic voltage-rectifiers (AVR) 102 that convert AC 110V into DC + 24V, ± 15V, ± 12V, and + 5V. A control relay 103 is installed at both ends of the + 24V, ± 15V, and ± 12V automatic voltage regulator (AVR) outputs to monitor the voltage output from the automatic voltage regulator (AVR), and the DC power supply unit (DEU) In front of the enclosure, a test point (TP: 104) is drawn out so that the output voltage can be measured without opening the DC power supply unit (DEU) during operation.

Each control relay contact is ANDed and delivered to the control unit (CTU) 105, where the control unit (CTU) provides a DC power supply unit (DEU), a buffer-1 (BF-1: Buffer-1), and an interface. All power monitoring contacts of the unit (INF: Interface Unit) are ANDed to generate a single Power Source Healthy at ON (HP) signal, which is called "Power Source Unhealthy". (HYROP) Used as an interlock for heavy duty treatment and cold rolling mill operation.

The main problem of the conventional hydraulic pressure reduction system (HYROP) automatic voltage regulator (AVR) lies in the control relay 103 for monitoring whether the automatic voltage regulator (AVR) output voltage is abnormal. In the hydraulic pressure reduction system HYROP, only the contact a of the control relay is constantly monitored, and the general-purpose control relay employed here usually has the operating characteristics as shown in FIG. The minimum operating voltage (1b) is 80% or less, the maximum allowable voltage (1a) is 110%, and the return voltage (1c) is 15% or more. When% is applied, the contact is turned on, and when the output voltage drops over input power outage or AVR, the contact is turned off when 15% is reached. The maximum allowable voltage is 110%. The problem is the contact state of the control relay in the output voltage range of 90% to 15%, which is the poor control section (1d) when the hydraulic voltage reduction system (HYROP) automatic voltage regulator (AVR) output voltage is abnormal. Each control module of the hydraulic pressure reduction system (HYROP) (Control Unit (CTU), Sequencer Unit (SCU), Printed Circuit Board Unit (PIU), Interface Unit (INF: Interface Unit) )) Specifies allowable DC input voltage of ± 10%. That is, the proper input voltage of the control unit (CTU) and printed circuit board unit (PIU) using + 5V is within 4.5 to 5.5V.

The control relay remains on until the output voltage drops to 15% due to an input power outage or an automatic voltage regulator (AVR). The hydraulic pressure reduction system (HYROP) and the upper power line communication (PLC) The DC power supply unit (DEU) recognizes the normal state and sends out various control outputs, but each control module (control unit (CTU), sequence unit (SCU), printed circuit) of the actual hydraulic pressure reduction system (HYROP) Board unit (PIU) and interface unit (INF) emit excessive control output due to lack of input voltage, and eventually thickness control of cold rolling mill becomes impossible.

However, the hydraulic pressure reduction system (HYROP) or hydraulic power reduction system (PLC) cannot judge that the cause of the thickness control failure is due to the hydraulic pressure reduction system (HYROP) automatic voltage regulator (AVR). System (HYROP) automatic Volt-Reculator (AVR) supervisory circuits and methods are too poor. This is because, in the HYROP heavy field called "Power Source Unhealthy," not only DC power supply unit (DEU) but also power supply such as Buffer-1 (BF-1) and Interface Unit (INF) This is because all of the abnormal signals are ANDed together and managed as a single signal, and nothing can be monitored except for one contact point of the control relay which must be lowered to 15%.

Another problem is that there are no control relays on both sides of the + 5V Automatic Voltage Reciprocator (AVR) output. Commercially available control relays are usually for 6V, 12V, 24V, 48V and 110V, so there is no 5V use.

Accordingly, the present invention has been made to solve the problems of the state monitoring and protection failure of the hydraulic pressure reduction system (HYROP) automatic voltage regulator (AVR) as described above, the hydraulic pressure reduction system (HYROP) automatic voltage reduction regulator (AVR) ) Real-time monitoring of output voltage detects abnormal symptoms of automatic voltage regulator (AVR) in advance, and activates accurate protection circuit when necessary to feed back to equipment operation to maintain stable thickness control in cold rolling. It is an object of the present invention to provide a real-time monitoring device for automatic voltage regulator (AVR) output voltage for rolling reduction system.

It is another object of the present invention to provide an automatic voltage regulator (AVR) output voltage real-time monitoring device for a hydraulic pressure reduction system to minimize the time required for troubleshooting.

The hydraulic pressure reduction system (HYROP) automatic voltage regulator (AVR) output voltage real-time monitoring device of the present invention for achieving the above object,
A DC power supply unit (DEU: DC power supply unit) installed in a hydraulic roll positioning device (HYROP) control panel and having an automatic voltage regulator (AVR: Automatic Voltage Regulator) for supplying control power of the hydraulic reduction system. Supply Unit);
Automatic voltage regulator (AVR) output power monitoring unit detects the output voltage of the automatic voltage regulator (AVR) and transmits analog and digital data in real time to self-protection and higher power line communication (PLC). ;
A control unit (CTU) for receiving internal direct current (DC) power from the DC power supply unit (DEU) to perform internal control of the hydraulic pressure reduction system (HYROP);
A sequence unit (SCU) that receives direct current (DC) power from the DC power supply unit (DEU) and is in charge of interfacing with an external device;
Printed with DC (Direct Current) power from the DC Power Supply Unit (DEU) and equipped with CPU (CPU) Central Processing Unit (CPU) and Analog and Digital I / O (PCB) Printed Circuit Board (PCB) A printed circuit board unit (PIU);
Commands operation to the hydraulic pressure reduction system (HYROP) and monitors the operation result in real time, and whether the cold rolling mill is operated based on the result detected by the automatic voltage regulator (AVR) output power monitoring unit of the hydraulic pressure reduction system (HYROP). Upper power line communication (PLC) to determine the power supply;
A serial transfer unit (STU) embedded in the hydraulic pressure reduction system (HYROP) and the upper power line communication (PLC) to perform serial communication with each other; And
And a human machine interface (HMI) for monitoring and manipulating the cold rolling mill provided from the upper power line communication (PLC) and the hydraulic pressure reduction system (HYROP) operation information.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 shows an automatic voltage retarder (AVR) output voltage real-time monitoring device for a hydraulic pressure reduction system according to the present invention, looking at the components of the monitoring device according to the following.

First, a DC power supply unit (DEU, 10) with a built-in automatic voltage regulator (AVR) for supplying a hydraulic pressure reduction system (HYROP) control power is provided in the hydraulic panel (HYROP) control panel. Automatic Voltage Rectifier (AVR) output power monitoring that detects AVR output voltage and sends analog and digital data in real time to self-protection and upper power line communication (PLC) A control unit that performs internal control of the hydraulic pressure drop system (HYROP) by supplying DC (Direct Current) + 24V, ± 15V, + 5V power from the negative (DC undervoltage relay) 20 and DC power supply unit (DEU, 10). (CTU: Control Unit, 30), Sequence Unit (SCU: Sequencer Unit, 40) that is in charge of Interface with external devices by receiving DC (Direct Current) + 24V power from DC Power Supply Unit (DEU, 10). ), DC power supply unit (DEU, 10) DC (Direct Current) + 24V, ± 15V, ± 12V, + 5V power, and the CPU (CPU) Central Processing Unit (CPU) and analog and digital input / output (I / O) PCB (PCB: Printed Circuit Board) Printed Circuit Board Units (PIUs) are also available.

Externally, there is a High Power Line Communication (PLC) (60) and a Human Machine Interface (HMI) 120 that oversee all operations and control of cold rolling mills.

The upper power line communication (PLC, 60) commands the HYROP to monitor the operation results in real time, and the automatic voltage regulator (AVR) output power monitor of the hydraulic pressure reduction system (HYROP) (DC deficiency voltage relay) ( Based on the detection result in 20), it is decided whether to operate the cold rolling mill.

The human machine interface (HMI) 120 has the function of monitoring and manipulating cold rolling mill and hydraulic pressure reduction system (HYROP) operation information provided from the upper power line communication (PLC) 60.

In addition to the above items, there are various elements constituting the hydraulic pressure reduction system HYROP. Serial transfer unit (STU: Serial Transfer Unit (70)), upper power line communication (PLC, 60), and load cell panel, which are each embedded in the upper power line communication (PLC) 60 and the hydraulic pressure reduction system (HYROP), and perform serial communication. (Load Cell Panel) 80 is an interface unit (INF: Interface unit 90) in charge of the interface, Force Motor Valve (FMV: Force Motor Valve, a kind of Servo Motor that controls the hydraulic cylinder mounted at the bottom of the cold rolling mill Power Amplifier (P-Amp) (100) that gives current command to the current), and Magnescale Unit (MSU: Magnescale Unit, which reads and counts the roll gap position change by the hydraulic cylinder in μm units). 110) a mill stand that is actually responsible for rolling.

Referring to Figure 4a to 4c according to the present invention will be described the operation of the AVR output voltage real-time monitoring device for the hydraulic pressure reduction system as follows.

First, an automatic voltage regulator (AVR) output power monitoring unit (DC undervoltage relay) which detects a voltage across each automatic voltage regulator (AVR) 10b output unit of the DC power supply unit (DEU) 10. Put 20. The automatic voltage regulator (AVR) output power monitor 20 is supplied with operating power of AC (alternating current) 110V through the L1 and L2 (10d) terminals, and an LCD (LCD: LCD liquid crystal display, 10e) Displays the measured voltage digitally (e.g. + 4.5V) to one digit after the decimal point, and sets the low voltage trip value by placing a voltage volume range (VR) (10f) on the left side of the middle part. A trip can be generated at 90% of the rated output voltage, and a time volume range (10g) is placed on the right side of the middle to detect that the voltage has dropped to 90%, and then the relay is actually The time required for tripping can be set within the range of 0.2-30S, and in the middle, there is an LED (Light Emitting Diode) Lamp (10h) so that the green LED (LED) is normally lit and then the DC undervoltage relay Red LED when is tripped (LED) flashes to indicate a fault condition.

The external output terminals C, a, b (10i) in the middle of the lower part output a contact (Dry Contact) to the control unit (CTU) 30 when the DC undervoltage relay trips, and the hydraulic pressure drop system (HYROP) and cold It is used as a rolling interlock operation, and the + and-terminals 10j on the right side of the lower part transmit the measured voltage to the sequence unit (SCU) 40 and the upper power line communication (PLC, 60) in real time to monitor and duplicate the interlock. Enable it.

In addition, a + 5V automatic voltage regulator (AVR) also has a new automatic voltage regulator (AVR) output power monitoring unit (DC deficiency voltage relay) 20 so as to enable monitoring and protection.

4B shows only four dry voltage regulators (AVR) in the DC power supply unit (DEU, 10) by separating only the dry contact (10i) received by the control unit (CTU) 30 from the DC power supply unit (DEU, 10). Power Source Healthy at ON (HP) Relay (10k) is configured to operate when any one of the above occurs, and the conventional Power Source Healthy at On (HP) 10l is buffered -1 (BF-1: Buffer-1) and interface unit (INF) power supply monitoring by switching the power supply unit (DEU), buffer-1 (BF-) 1: Configure the circuit and internal logic to easily identify which of the three control modules, Buffer-1) and the interface unit (INF).

4C shows a sequence unit analog input printed circuit board unit (SCU AI PCB) (10m) and higher power line communication analog input printed circuit board unit from a DC power supply unit (DEU) 10. FIG. (PLC AI PCB: Power Line Communication Analog Input Printed Curcuit Board) (10n) receives automatic voltage regulator (AVR) output voltage and monitors the result of human machine interface (HMI) located in the cab. It is provided to (Monitor). It is not just a display of incoming or measured voltages on the Analog Input Printed Circuit Board Unit (AI PCB), but also a display on a Human Machine Interface (HMI) monitor. Monitoring and interlock are configured through programming.

Referring to FIG. 5, the operation characteristics of the automatic voltage regulator (AVR) output power monitor 20 are as follows.

Hydraulic pressure reduction system (HYROP) The rated allowable input voltage of each control module (control unit (CTU), printed circuit board unit (PIU), sequence unit (SCU), interface unit (INF)) is ± 10%. Is 100% of normal voltage (2a), and it operates normally up to 91% of normal voltage, and when it reaches 90%, it generates a low voltage trip (2b) and the result is the hydraulic pressure reduction system (HYROP) itself and the upper power line communication (PLC). Will print).

90% of the time of low voltage trip is reached, and the time required for the automatic voltage regulator (AVR) output power monitor 20 to output dry contact to the outside is freely within 0.2 ~ 30S (2c) range. HYROP heavy-duty field due to sudden tripping, and cold rolling equipment is quick-stopped to make it large in the mill stand. Preventing breakage and spreading of damage.

In the hydraulic pressure reduction system (HYROP), when the output voltage of the automatic voltage reduction regulator (AVR) drops to 90%, a trip is generated, which is used as a hydraulic pressure reduction system (HYROP) and a cold rolling mill operation interlock. (PLC) is further subdivided and configured to simultaneously monitor and protect the low and high voltages.

In 105% (2e) and 95% (2f), it is treated as a warning letter, and only buzzer and message are displayed on the human machine interface (HMI) screen, and in 110% (2d) and 90% (2b), it is used. The trip and hydraulic pressure reduction system (HYROP) and cold rolling mill control are configured to normal stop.

Therefore, the automatic voltage regulator (AVR) output power monitor (DC deficiency voltage relay, 20) of the hydraulic pressure reduction system (HYROP) control panel monitors the LCD through the LCD display and the upper power line communication (PLC). Through the human machine interface (HMI), a cross check is performed in two or three times through the screen, so that the automatic voltage retarder (AVR) output voltage, warning sign, and heavy fault can be seen at a glance.

In addition, when the automatic voltage regulator (AVR) output voltage is out of the specified range, a warning fault-heavy fault is processed step by step so that the control of the conventional hydraulic pressure reduction system (HYROP) automatic voltage regulator regulator (AVR) output voltage is abnormal. In the 90-15% section, which is the defective section 1d, it is possible to prevent the mass quality defect of the cold rolled material due to the roll gap control failure.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention is not limited to the contents described in the accompanying drawings and the detailed description of the specification.

As described above, according to the present invention, the hydraulic voltage reduction system (HYROP) automatic voltage regulator (AVR) output voltage real-time state monitoring, the abnormal symptoms of the automatic voltage regulator (AVR) is detected in advance, and when necessary By operating the correct protection circuit and feeding back the equipment operation, there is an effect of enabling stable thickness control in cold rolling.

In addition, it is easy to determine whether there is an automatic Voltare Rectifier (AVR) abnormality can shorten the time required for replacement and can have a significant effect in minimizing production pauses.

Claims (1)

A DC power supply unit (DEU: DC power supply unit) provided in a hydraulic roll positioning device (HYROP) control panel and having an automatic voltage regulator (AVR: Automatic Voltage Regulator) for supplying control power of the hydraulic reduction system. Supply Unit); Automatic voltage regulator (AVR) output power monitoring unit detects the output voltage of the automatic voltage regulator (AVR) and transmits analog and digital data in real time to self-protection and higher power line communication (PLC). ; A control unit (CTU) for receiving internal direct current (DC) power from the DC power supply unit (DEU) to perform internal control of the hydraulic pressure reduction system (HYROP); A sequence unit (SCU) that receives direct current (DC) power from the DC power supply unit (DEU) and is in charge of interfacing with an external device; Printed with DC (Direct Current) power from the DC Power Supply Unit (DEU) and equipped with CPU (CPU) Central Processing Unit (CPU) and Analog and Digital I / O (PCB) Printed Circuit Board (PCB) A printed circuit board unit (PIU); Commands operation to the hydraulic pressure reduction system (HYROP) and monitors the operation result in real time, and whether the cold rolling mill is operated based on the result detected by the automatic voltage regulator (AVR) output power monitoring unit of the hydraulic pressure reduction system (HYROP). Upper power line communication (PLC) to determine the power supply; A serial transfer unit (STU) embedded in the hydraulic pressure reduction system (HYROP) and the upper power line communication (PLC) to perform serial communication with each other; And A cold rolling mill provided from the upper power line communication (PLC) and a Human Machine Interface (HMI) for monitoring and manipulating the hydraulic pressure reduction system (HYROP) operation information. Output voltage real time monitoring device.

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