JPH07230319A - Detecting method for wiring abnormality of servo controller system - Google Patents

Abstract

PURPOSE:To accurately detect the wiring abnormality and the loop abnormality between a servo controller and a driving part by providing a resistance in the servo controller to detect a feedback potentiomenter current and monitoring whether the change is recognized for the voltage value of a potentiometer ground line and a potentiometer position detecting line. CONSTITUTION:A resistance 7 is provided in a servo controller to detect the current of a potentiometer connected to a feedback circuit 14. The voltage VE of a potentiometer ground line 6 is measured together with the voltage VD of a potentiometer position detecting line 5. Then a motor M is driven forward to monitor whether the change is recognized for the voltage VE and VD. The voltage VE has no change in a normal connection state but the VE changes if the line 5 and a potentiometer power supply line 4 are wired wrong, for example. Thus the wrong wiring is detected at the side of the potentiometer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention determines the shaft position of a drive unit by a control signal from a controller. Therefore, the input signals are compared by a feedback link from the drive unit until the shaft position matches the signal value. The present invention relates to a method for detecting a wiring abnormality between the servo controller and the drive unit, which comprises a servo controller for moving the drive unit.

[0002]

2. Description of the Related Art The method of miswiring detection currently performed is
This is a method in which a person manually confirms the operation of the motor and the position display of the servo controller by manually driving the drive motor of the valve or the like from the servo controller. Therefore, when there are a plurality of sets of valve driving motors and servo controllers, the confirmation time is required for the number of units or the confirmation personnel is required for the number of units.

Further, since the disconnection between the potentiometer and the servo controller has not been conventionally detected, 3
If any of the wires in the book is broken, normal operation of the operating part such as the valve cannot be performed, and a runaway condition will occur. Therefore, the valve of the operating part is fixed in either the fully open direction or the fully closed direction, which may cause a very dangerous state in a plant or the like.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and its object is to accurately detect wiring irregularities and loop irregularities between a servo controller and a drive unit of a device using a servo controller. In the event of occurrence of the above, it is intended to improve the safety of the system using the servo controller by preventing the drive section from running out of control.

Here, the loop abnormality is a series of abnormality in which the servo controller, its drive section, and the driving power source are in a loop, and the following items are integrated. 1) Servo controller side 1-1 Failure of semiconductor / relay that sends signal to drive section 1-2 Failure of feedback circuit 2) Drive section side 2-1 Motor failure (electrical / mechanical) 3) Motor power supply side 3- 1 Motor circuit wiring failure 3-2 Motor power supply (transformer) failure

[0006]

In order to solve the above-mentioned problems, the present invention detects a feedback potentiometer current of a potentiometer connected to a feedback link with respect to a wiring abnormality generated between a servo controller and a drive section. Resistance is provided in the servo controller, the voltage value for driving the potentiometer ground line and the voltage value for the potentiometer position detection line are measured after applying a voltage for driving the drive unit, and the presence or absence of changes in those voltage values is checked. A measure is taken to detect wiring irregularities by monitoring or comparing their voltage values with the ground voltage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an entire apparatus including a servo controller according to the present invention and a driving section driven by the servo controller. The servo controller is a microprocessor (MP) operated by a control signal from a controller.
U). In the case of the illustrated device, for example, control signals such as temperature, humidity, flow rate, and pressure are transmitted from the controller to control the operation amount in the operating parts such as valves and dampers. In order to determine the motor shaft position of the drive unit, a closed loop for comparing the signal fed back from the drive unit and the input signal is formed by connecting the feedback circuit with the microprocessor and the control output calculation / motor failure detection circuit. .

The configuration of each part of the servo controller will be specifically described. In FIG. 1, reference numeral 11 is a control input circuit, and the control signal input from the controller is an analog signal in which its voltage, current and potentiometer signal are unified. A /
What is sent to the D converter, 12 is the above-mentioned microprocessor, which operates and controls all signals to cause each part to perform a predetermined function, 13 is a control output calculation / motor failure detection circuit, and the control input circuit 11 From the feedback circuit 14, which will be described later, performs a comparison operation to constantly output a control output that makes the deviation zero, and causes the drive unit to follow the control signal. Further, the circuit 13 calculates the control signal and the feedback signal and monitors the operation of the drive unit, so that the control can be stopped when a defect such as a motor defect, a wiring defect, or a motor power source occurs.

The feedback circuit 14 converts a signal from a position transmitter, that is, a potentiometer provided in the drive unit into a unified analog signal, and calculates the control output.
Signals are sent to the motor failure detection circuit 13 and the potentiometer disconnection / miswiring diagnosis circuit 15 described later to be used as various calculation and diagnosis information. The potentiometer disconnection / miswiring diagnosis circuit 15 is a circuit that implements the wiring irregularity detection method according to the present invention. The potentiometer disconnection / miswiring diagnosis circuit 15 receives a signal from the disconnection detection circuit provided in the feedback circuit 14, and detects a miswiring during a trial run (test mode). The presence / absence is diagnosed and detected, and displayed on the display device 18 described later. In addition, in the operation mode, the abnormal wiring is constantly detected even during a temporary stop, and the control is stopped at the same time when the abnormal state is detected
The runaway due to the full opening or full closing of the drive unit that may occur in the operation mode is prevented in advance.

Reference numeral 16 is a control output circuit, which controls the operation of the semiconductor and the relay by the control output calculation unit of the control output calculation / motor malfunction detection circuit 13 described above, and the fine calculation by sparkless, chattering-less and semiconductor inching by function calculation. Various controls can be realized. By using a relay, the influence of the voltage on the non-excitation winding side is eliminated and the reliability of the semiconductor is improved.

Reference numeral 17 denotes a setting key, which comprises a mode switching key, an auto / manual switching key, an up key, a down key and a plurality of other keys. Reference numeral 18 is a data / character display, which is used for opening values of valves and dampers, input values,
Means for displaying numerical data such as deviation values, driving modes, parameters, etc. and characters, 19 is a segment driver, which drives an indicator or position indicator 20 indicating the axial position of the drive unit, and the position indicator 20 is The driver 19 has an instruction unit 21 for displaying a signal from a potentiometer attached to the drive unit. The means 21 comprises a large number of light emitting diodes and can be displayed in an analog manner.

The wiring irregularity detection method according to the present invention is characterized by erroneous wiring that may occur between the servo controller and the drive section.
Alternatively, the present invention relates to a technique for detecting abnormalities in wiring such as disconnection. Therefore, in the present invention, one or two resistors for detecting the current of the potentiometer connected to the feedback circuit are provided in the servo controller.

<Wrong Wiring Detection Method> FIG. 2 is a circuit diagram relating to an embodiment of the present invention for the purpose of detecting wrong wiring. In FIG. 2, 1 is a control line for driving the motor M in the opening direction, and 2 is a control line. Motor power supply line, 3 is a closing direction control line, 4 is a potentiometer power supply line, 5 is a potentiometer position detection line, 6 is a potentiometer ground line, and 7 is a resistor for potentiometer current detection. Is provided in the potentiometer ground wire 6.

A program for detecting the incorrect wiring is shown as a flow chart in FIG. 4, and after measuring and storing the voltage VE on the potentiometer ground line 6 and measuring and storing the voltage VD on the potentiometer position detection line 5, the motor is detected. M is driven in the positive direction, for example, in the opening direction of the valve, and the presence or absence of changes in the potentiometer ground portion voltage VE and the detection portion voltage VD is monitored. If there is no abnormality, the potentiometer ground portion voltage VE is measured and stored again, and the potentiometer detection portion voltage VD is measured and stored again. Then, the motor M is driven in the reverse direction, for example, the valve closing direction, and the ground portion voltage VE and the detection portion are detected. The voltage VD is monitored for changes.

Next, an example of erroneous wiring detection by the method of the present invention will be described (see FIG. 3).

In a normal connection state, a DC positive voltage is applied to the potentiometer power supply line 4, and when the motor drive voltage is applied between the opening direction drive control line 1 and the motor power supply line 2, the potentiometer position is detected. Detector voltage VD
However, the voltage VE of the potentiometer ground portion does not change. Further, even if a motor drive voltage is applied between the closing direction drive control line 3 and the motor power supply line 2, the potentiometer position detection section voltage VD becomes small, but the potentiometer ground section voltage VE does not change.

First Example (FIG. 3 (a)) The potentiometer power supply line 4 and the potentiometer position detection line 5 are erroneously wired, a positive DC voltage is applied to the potentiometer position detection line 5, and the open direction drive control line 1 is connected. When the motor drive voltage is applied between the motor power supply lines 2 and the position is detected from the potentiometer power supply line 4, the position detection voltage increases and the voltage V of the potentiometer grounding portion increases.
E becomes smaller. On the other hand, when a motor drive voltage is applied between the closing direction drive control line 3 and the motor power supply line 2, the voltage VE of the potentiometer grounding portion is increased.

Therefore, it can be seen that there is erroneous wiring on the potentiometer side.

Second Example (FIG. 3 (b)) The potentiometer ground wire 6 and the potentiometer position detection wire 5 are erroneously wired, and a motor drive voltage is applied to the open direction drive control line 1 and the motor power supply line 2. When the position is detected from the potentiometer ground wire 6, the position detection voltage becomes large and the current detection voltage VD of the potentiometer position detection line 5 becomes small. When the motor drive voltage is applied between the closing direction drive control line 3 and the motor power supply line 2, the current detection voltage VD of the potentiometer position detection line 5 is increased.

Also in this case, it can be seen that there is erroneous wiring on the potentiometer side.

Third Example When the open direction drive control line 1 and the motor power supply line 2 are erroneously wired (FIG. 3C) and the close direction drive control line 3 and the motor power supply line 2 are erroneously wired. In the diagram (3 (d)), since the motor operates only in the opening direction or the closing direction, the potentiometer position detection unit voltage VD only increases or decreases.

In this case, it can be seen that there is erroneous wiring or disconnection on the motor side.

<Disconnection Detection Method> FIG. 5 is a circuit diagram relating to an embodiment of the present invention for detecting a disconnection. Reference numerals 1 to 7 in FIG. 5 are common with reference numerals 1 to 7 in FIG. The description is omitted here. However, in the case of the present example for detecting disconnection, the potentiometer position detection line 5 is also provided with the disconnection detection resistor 8.

The program for detecting the incorrect wiring is shown as a flow chart in FIG. 7, and it is determined whether the voltage VE of the potentiometer ground line 6 is higher than the ground potential and whether the voltage VD of the potentiometer position detection line 5 is the ground potential. It monitors whether or not it is larger. In this way, in the case of disconnection detection, it is judged whether there is something abnormal with reference to the grounded electric field.Therefore, the process up to the measurement of the potentiometer ground wire part voltage and the measurement of the potentiometer detection wire part voltage is the case of the above-mentioned miswiring detection. The same as

Further, an example of detecting a disconnection according to the method of the present invention will be described by dividing it into cases (see FIG. 6).

When the normal connection is made and the normal operation is performed, when the motor drive voltage is applied between the opening direction drive control line 1 and the motor power supply line 2, the potentiometer position detection line 5 is detected. A voltage proportional to the opening of the valve is measured, and a constant voltage is constantly measured from the potentiometer ground wire 6. At this time, the voltage VD of the potentiometer position detection line 5 does not become equal to the voltage applied to the potentiometer power supply line 4 even if the valve of the operating portion is fully opened because of the residual resistance of the potentiometer P. Further, even if the valve is fully closed, it does not become equal to the voltage VE of the potentiometer ground wire 6.

First Example (FIG. 6 (a)) When the potentiometer power supply line 4 is disconnected outside the servo controller, the voltage VD of the potentiometer position detection line 5 becomes the same as the ground potential, and the potentiometer current detection resistor 7 receives a current. No longer flows, the voltage VE of the potentiometer ground wire 6 becomes the same as the ground potential.

Therefore, it can be seen that the potentiometer power supply line 4 is broken.

Second Example (FIG. 6 (b)) When the potentiometer ground wire 6 is broken outside the servo controller, the voltage V of the potentiometer position detection wire 5
D becomes the same as the potentiometer power supply line 4, and no current flows through the potentiometer current detection resistor 8, so
The voltage of the potentiometer ground wire 6 becomes the same as the ground potential.

Therefore, in this case, the disconnection of the potentiometer ground wire 6 can be seen.

Third Example (FIG. 6 (c)) When the potentiometer position detection line 5 is broken outside the servo controller, the voltage VD of the potentiometer position detection line 5 becomes the same as the ground potential, and the potentiometer current detection resistor 8 receives a current. Is flowing, the voltage VE of the potentiometer ground wire 6 maintains a constant value.

Therefore, in this case, it can be seen that the potentiometer position detection line 5 is broken.

Other Examples For example, if any of the wires 1, 2, 3 leading to the motor M has a disconnection, the motor M does not rotate at all or moves only in one of the opening direction and the closing direction. In this case as well, detection is possible.

[0034]

Since the present invention is constructed and operates as described above, it is possible to accurately detect erroneous wiring and disconnection between the servo controller and the drive section, and the confirmation personnel required in the past. It is possible to reduce the time required for confirmation work and prevent runaway of controlled equipment, equipment and the like.

[Brief description of drawings]

FIG. 1 is a block diagram of an entire apparatus for detecting abnormal wiring according to the present invention.

FIG. 2 is a circuit diagram of a main part of the same as above when false wiring is detected.

FIG. 3A is a circuit diagram showing a first example of miswiring. (B) A circuit diagram showing a second example of miswiring. (C) A circuit diagram showing a third example of miswiring. (D) A circuit diagram showing a fourth example of miswiring.

FIG. 4 is a flow chart showing the method of the present invention in the case of miswiring detection.

FIG. 5 is a circuit diagram of a main part showing an example in the case of detecting disconnection.

FIG. 6A is a circuit diagram showing a first example of disconnection. (B) A circuit diagram showing a second example of disconnection. (C) A circuit diagram showing a third example of disconnection.

FIG. 7 is a flowchart showing the method of the present invention in the case of disconnection detection.

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Claims (3)

[Claims] 1. A servo controller for comparing the input signals by a feedback link from the drive unit to determine the shaft position of the drive unit by the control signal from the controller and moving the drive unit until the shaft position matches the signal value. A method for detecting a wiring abnormality between the servo controller and the drive unit, wherein a resistor for detecting a feedback potentiometer current of a potentiometer connected to the feedback link is provided in the servo controller, and After applying a voltage to drive this to the drive unit, measure the voltage value of the potentiometer ground line and the voltage value of the potentiometer position detection line, and monitor whether there is a change in those voltage values or ground those voltage values and ground. Servo controller characterized by detecting wiring irregularity by comparing with voltage Method for detecting abnormal wiring in a system. 2. A miswiring is detected on the side of the drive unit by detecting whether or not the voltage of the potentiometer ground portion after the drive unit is driven in the forward direction is changed and by detecting whether or not the voltage of the potentiometer ground portion after the drive unit is driven in the reverse direction is changed, The miswiring on the potentiometer side is detected by the presence or absence of a change in the voltage of the potentiometer position detection unit after the drive unit is driven in the forward direction and the presence or absence of a change in the voltage of the potentiometer position detection unit after the drive unit is driven in the reverse direction. A method for detecting abnormal wiring in the servo controller system according to the item. 3. A potentiometer ground wire and a potentiometer position detection wire are provided with resistors, respectively, and a break in either the ground wire or the power supply wire is detected by comparing the potentiometer ground wire potential with the ground voltage. The method for detecting wiring irregularity in a servo controller system according to claim 1, wherein the disconnection of the position detection line or the power supply line is detected by comparing the voltage of the potentiometer position detection line with the ground potential.