JPH04284514A - Alarm level setting device for control object - Google Patents

Abstract

PURPOSE:To simplify the setting of an alarming level for detecting the abnormality of a heater circuit at the time of start in respect of an alarm level setting device mounted on a multi-point temperature controller. CONSTITUTION:An input circuit 13 to input the alarming level, a measurement input circuit 17 to input the measured temperature of a heater, and a current detector input circuit 19 to input a driving current value to the heater are connected to a control circuit 11. A preceding data storage circuit 27 in which the driving current value at the time of the preceding start is stored is connected to the control circuit 11 through a data comparator circuit 25. The data comparator circuit 25 compares the data from the measurement input circuit 17 with the data from the preceding data storage circuit 27, and if they are similar, a preceding alarming level based on the preceding data is set to the control circuit 11. If comparison results are different from each other, the control circuit 11 sets the new alarming level by an instruction from the input circuit 13.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an alarm level setting device for a controlled object, and more particularly, to an alarm level setting device for detecting an abnormality in a controlled object controlled by a controller, and more specifically to an alarm level setting device for detecting an abnormality in a controlled object controlled by a controller. The present invention relates to an alarm level setting device that sets an alarm level for detecting abnormality in a heater circuit as a controlled object.

0002

2. Description of the Related Art As shown in FIG. 9, a temperature controller 1 uses a set value SV set from the outside and the temperature of a heater 3 as a control object disposed in, for example, an injection molding machine (not shown). Manipulated amount MV from measured value PV measured by sensor 5
is calculated by PID, and the heater operating device 7 is turned to O using the operation amount MV.
The drive current from the commercial power supply 9 is controlled by turning it on and off to flow to the heater 3 according to the manipulated variable MV. In this temperature controller 1, when an abnormal current situation occurs to the heater 3 due to a disconnection of the heater 3 or a welded contact of a switch (not shown) in the heater operating device 7, the abnormality is detected. Many examples are equipped with an abnormality detection device that outputs alarm signals, etc.

Conventionally, this type of heater abnormality detection device is
The drive current value to the heater 3 is detected by a current transformer CT placed in the connection line between the heater operating device 7 and the heater 3, and the detected value exceeds an alarm level set in advance by a variable resistor (not shown). Generally, the temperature controller 1 is configured to output an alarm signal when the temperature controller 1 is activated. For convenience, the temperature controller 1 shown in FIG. 9 is simplified to have a one-channel configuration that controls one heater 3 consisting of three heater wires, but in reality, it is possible to control a large number of heaters 3. In addition, it has a configuration with a large number of control channels. In addition, in FIG. 9, the temperature controller 1 is the power source 9 of the heater 3.
Although they are considered to be the same, they do not necessarily have to be the same.

0004

[Problems to be Solved by the Invention] However, in the temperature controller 1 described above, when starting up, it is necessary to set the alarm level in advance with a variable resistor for each individual heater channel, so it is difficult to set the alarm level. work to do,
It is troublesome to check the alarm level for each heater channel at startup. In addition, since the number and capacity of heaters generally differ depending on the injection mold placed in an injection molding machine, each time an injection mold is replaced, the heaters and capacities are changed for each control channel. The alarm level must be reset depending on whether the current transformer is used or not.
The adjustment work is extremely complicated.

In particular, when driving a large number of heaters in an injection molding machine with three-phase alternating current, compared to a configuration in which the heaters 3 are driven with single-phase alternating current, for example, as shown in FIG. Since it is necessary to dispose a current transformer (not shown) in any one, two or three lines to detect the current and judge an abnormality, the adjustment work becomes even more complicated. These drawbacks are based on the startup of temperature controller 1,
There are also various problems with setting the alarm level after startup. For example, the current detection value by the current transformer CT is affected by fluctuations in the power supply voltage, but the alarm level does not fluctuate, so there is a risk that a false alarm will be issued. Furthermore, since the resistance value of the heater 3 generally increases as the temperature rises,
From the perspective of making alarm judgments that match the control target, it is necessary to devise ways to set the alarm level after startup.

The present invention has been made in order to solve the above-mentioned drawbacks of the conventional art, and it is an object of the present invention to provide an alarm level setting device that not only allows easy setting of the alarm level for a controlled object in a controller, but also enables automatic setting. With the goal. Also,
SUMMARY OF THE INVENTION An object of the present invention is to provide an alarm level setting device that is unlikely to issue a false alarm even when the power supply voltage fluctuates and is not affected by power supply fluctuations. A further object of the present invention is to provide an alarm level setting device that can set an alarm level suitable for a controlled object.

[0007]

[Means for Solving the Problems] In order to solve such problems, a first configuration of the present invention, as shown in the claim correspondence diagram of FIG. 1, includes at least current detection means 100, input means 101, It is comprised of a storage means 102 and an alarm level setting means 103. Current detection means 100
is for detecting the drive current value from the power supply to the controlled object, the input means 101 is for inputting and instructing at least the alarm level, and the storage means 102 is for storing in advance the drive current value at startup corresponding to the controlled object. It is stored. The alarm level setting means 103 detects the current detecting means 10 at the time of startup.
The drive current value detected at 0 is compared with the drive current value in the storage means 102 to determine the activation state, and when it is determined that the activation state is similar to the drive current value in the storage means 102, the storage means 102
An alarm level is set based on the drive current value of , and when a different activation state is determined, another alarm level is set based on an instruction from the input means 101.

A second configuration of the present invention, as shown in the claim correspondence diagram of FIG. 2, includes input means 200 for inputting at least a reference power supply voltage value, storage means 201 for storing the reference power supply voltage value, It has power supply voltage detection means 203 that detects the power supply voltage value applied from the power supply to the controlled object, and alarm level setting means 204 that corrects and sets the alarm level according to the deviation between the detected value and the reference power supply voltage value. It is composed of

Further, the third configuration of the present invention is a startup alarm level that outputs a startup alarm level for determining an abnormality in the drive current value to the controlled object at startup, as shown in the complaint correspondence diagram of FIG. an output means 300; a post-startup alarm level output means 301 that outputs a post-startup alarm level based on the drive current value to the controlled object after a predetermined time has elapsed from the time of start-up; is an alarm level setting means 302 for setting the alarm level at startup or the alarm level after startup; and this alarm level setting means 30.
The configuration includes an input means 303 for externally selecting and inputting the settings after a predetermined period of time has elapsed in step 2. In this third configuration, the storage means 304 for storing a reference power supply voltage value in advance, and the power supply voltage detection means 305 for detecting the power supply voltage value applied from the power supply to the controlled object are provided, and this power supply voltage detection means 305 Preferably, the alarm level setting means 302 is configured to correct and set the alarm level according to the deviation between the detected value from the reference power supply voltage value and the reference power supply voltage value from the storage means 304.

Furthermore, the fourth configuration of the present invention, as shown in the diagram corresponding to the claims in FIG. A measuring means 401, a storage means 402 for periodically storing the measured value and drive current value during control of the controlled object, and a storage means 40 for storing the alarm level in advance.
The alarm level setting means 403 is configured to sequentially set an alarm level according to the transition of the measured value and the drive current value stored in 2. Moreover, in the fourth configuration, the storage means 402 is formed to store a reference power supply voltage value, and the power supply voltage detection means 404 detects the power supply voltage value applied from the power supply to the controlled object; It is preferable to provide a power supply voltage correction means 405 that corrects the power supply voltage according to the deviation between the detected value from the means 404 and the reference power supply voltage value from the storage means 402 and stores it in the storage means 402.

[0011]

[Operation] In the first configuration of the present invention having such a means, at the time of startup, the alarm level setting means 103 stores the drive current value detected by the current detection means 100 in the storage means 102, for example at the time of the previous startup. The activation state is determined by comparing it with the drive current value, and when it is determined that the activation state is the same as the activation state based on the drive current value in the storage means 102, and when it is determined that the activation state is different by setting the alarm level at the previous activation. , input means 10
Set another alarm level based on the instructions in step 1.

In the second configuration, the alarm level setting means 204 includes the storage means 201 and the power supply voltage detection means 2.
The alarm level is corrected and set according to the deviation between the reference power supply voltage value from 03 and the detected value.

Further, in the third configuration, the start-up alarm level output means 300 outputs the start-up alarm level, the post-start alarm level output means 301 outputs the post-start alarm level,
The alarm level setting means 302 sets the alarm level at the time of startup, and after a predetermined period of time, sets the alarm level at the time of startup or the alarm level after the startup in accordance with the selection of the input means 303. In the third configuration, the storage means 3
04 and power supply voltage detection means 305 to correct the alarm level based on the deviation between the detected power supply voltage value and the reference power supply voltage value, the alarm level setting means 302 determines the alarm level from the deviation between the reference power supply voltage value and the drive current value. Correct.

Furthermore, in the fourth configuration, the current detection means 4
00 is detected, a measuring means 401 measures the temperature of the controlled object, and a storage means 402 periodically stores the measured value and the driving current value. The alarm level setting means 403 sequentially changes and sets the alarm level according to changes in the measured value and drive current value stored in advance in the storage means 402. Moreover, in the configuration in which the power supply voltage detection means 404 and the power supply voltage correction means 405 are provided in the fourth configuration, the power supply voltage correction means 40
5 corrects the power supply voltage value based on the deviation from the reference power supply voltage value and stores it in the storage means 402.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 5 is a block diagram showing an embodiment of the alarm level setting device according to the present invention together with a temperature controller. The control circuit 11 is a microcomputer that has a CPU that is the main part of the operation processing of the alarm level setting device and the temperature controller, a ROM that stores the operation program of the CPU, and an I/O that interfaces with each circuit described later. It is formed of. The control circuit 11 includes an input circuit 13, a power supply voltage measurement circuit 15, a measurement input circuit 17, a current detector input circuit 19, a current level storage circuit 21, a memory area data storage circuit 23, a data comparison circuit 25, and a previous data storage circuit 27. , learning data storage circuit 28, circuit welding alarm output circuit 29, heater disconnection alarm output circuit 31, output circuit 33
, the display circuit 35, and the heater disconnection determination circuit 37, and manage them. The input circuit 13 is, for example, a keyboard arranged on the operation panel of the temperature controller, and is used to input set values SV, alarm levels, reference power supply voltage values,
It functions as an input means for inputting instructions necessary for operating the temperature controller, as well as various selections such as automatic or manual selection of the alarm level, which will be described later.

[0016] In addition to the keyboard, this input circuit 13 also has
For example, it may be formed by communication input means based on the RS232C standard or the like. As shown in FIG. 8, which is similar to FIG.
an A/D converter (not shown) that A/D converts the voltage stepped down in (not shown). Since FIG. 8 has the same configuration as FIG. 9 except for the step-down transformer T, the explanation thereof will be omitted. Note that the power supply voltage to the temperature controller 1 may be obtained directly from the power supply 9 in FIG. 8, or may be obtained from the output terminals A and B from the heater operator 7 to the heater 3.

The measurement input circuit 17 shown in FIG. 5 performs A/D conversion on the temperature signal measured by the temperature sensor 5 shown in FIG. The current detector input circuit 19 receives the detected value of the drive current from the heater operating device 7 to the heater 3 by the current transformer CT in FIG. This is a current detection means that A/D converts and counts the current value, and digitally measures and captures the drive current value to the heater 3. The current level storage circuit 21 stores the current value to the heater 3 measured by the current detector input circuit 19, a coefficient for alarm level calculation that corresponds to this measurement channel and is stored, for example, in the ROM of the control circuit 11, It is a readable and writable RAM that stores alarm levels calculated by the control circuit 11 from these current values and coefficients in correspondence with the respective current values. For example, if the measured current value of a certain channel is 100A, an alarm level such as 90A or 85A is stored together with this current value and a coefficient.

The memory area data storage circuit 23 has a plurality of storage areas, for example, operating data such as setting values SV for each heater arranged in each injection mold of an injection molding machine, drive current values, and alarm calculations. This is a read/write RAM that specifies the storage area and stores the coefficients and alarm levels, etc. for each injection mold or for each product processed by the injection mold. The control circuit 11 creates and stores the data based on the input data from the circuit 13 and the data from the current level storage circuit 21. The previous data storage circuit 27 is a readable and writable RAM that stores the previous operation control data, and the data comparison circuit 25
is also connected. As for the previous operation control data,
There is operation control data that was set when the power was last turned on, operation control data that was set when the power was turned off last time or just before a power outage, or operation control data that was set just before the previous detection of heater burnout or heater circuit welding. For example, the operation control data at the time of final mold exchange on the previous day, that is, at the time of startup, is generally used. These previous operation control data are processed under the instructions of the control circuit 11.
For example, the data is stored in the previous data storage circuit 27 from the control circuit 11 or the data comparison circuit 25 when a storage instruction is issued from the input circuit 13 or when the power supply to the meter is stopped.

The data comparison circuit 25 compares the current value from the current level storage circuit 21 and the previous current value of the previous data storage circuit 27 for each heater at the time of startup according to instructions from the control circuit 11, and determines whether they are the same. For example, the previous data storage circuit 27
While outputting the previous alarm level for each heater to the control circuit 11, the current value from the current level storage circuit 21 and the operation control data in the memory area data storage circuit 23 are output at the time of startup according to instructions from the control circuit 11. After selection and comparison, if there is the same operation control data, an alarm level related to the operation control data is outputted to the control circuit 11 for each heater. If the corresponding operation control data does not exist,
The control circuit 11 calculates and sets the data based on the data input from the input circuit 13, and stores it in the memory area data storage circuit 23. That is, data comparison circuit 2
5 functions as a part of alarm level setting means under the control of the control circuit 11, and after the alarm levels are initially set in the control circuit 11, heater control is started. The data comparison circuit 25 contributes to the start of automatic operation by outputting the above-mentioned operation control data to the control circuit 11 in addition to the alarm level at the time of startup.

The heater burnout determination circuit 37 compares the measured value from the current detector input circuit 19 with the alarm level set in the control circuit 11, and issues an alarm even though the manipulated variable MV of the controller is output. When the measured value decreases with respect to the level, it is determined that the heater is disconnected, and when the measured value exceeds the alarm level even though the manipulated variable MV of the controller is not output, it is determined that the circuit is welded, and the control circuit 11 It outputs the judgment result. In addition to the functions described above, the control circuit 11 has the following functions:
The measured value PV from the measurement input circuit 17 and the set value SV from the input circuit 13 are compared and a deviation is calculated, for example, PID.
Calculate and output circuit (see heater operating device 7 in FIG. 8) 33
In addition to outputting the manipulated variable MV to the
It is displayed on a display circuit 35 such as a display. Control circuit 1
1 outputs a heater breakage alarm signal from the heater breakage alarm output circuit 31 or outputs a circuit welding alarm from the circuit welding alarm output circuit 29 based on the result of the heater breakage judgment or circuit welding judgment from the heater breakage judgment circuit 37. It has the function of

The alarm level setting device of the present invention will be more clearly explained by referring to a flowchart showing its operation. In FIG. 6, when the power of the temperature controller is turned on, the operation program for initializing the heater abnormality alarm level starts, and in step 601 heater abnormality measurement is started, and in step 602, the current detector input circuit 19 receives the measurement points from the current detector input circuit 19. The current level storage circuit 21
Store in. Note that among the many measurement points, the measured value may be "0" because the heater is not used. Step 603
The data comparison circuit 25 compares the current value in the current level storage circuit 21 and the previous current value read from the previous data storage circuit 27 to determine whether there is any change from the previous data,
If it is the same as the previous time, select whether or not you wish to change the heater alarm level in step 604. If there is no change and the answer is NO, the process ends and the previous alarm level is then set in the control circuit 11. At the same time, the heater automatically starts operating according to the operation control data.

If step 604 is YES, then FIG.
The process moves to step 701. If it is determined in step 603 that the data is different from the previous data, it is determined in step 605 whether or not the memory area selection mode is set, and if NO, the process moves to step 701 in FIG. Step 605 is Y
If ES, current detector input circuit 1 is selected in step 606.
The measured value from step 9 is compared with a plurality of pieces of operation control data in the memory area, and in step 607, the memory area of the corresponding operation control data is specified. In the following step 608, it is determined whether or not there is a specific memory area. If not, the process moves to step 701 in FIG.
0, the control circuit 11 sets the alarm level of the specific memory area.
The heater automatically starts operating based on the operation control data.

[0023] If the determination at step 608 is no, then
As shown in FIG. 7, in step 701, a reminder signal is output or a reminder display is performed to reset the alarm level, and in the subsequent step 702, it is determined whether to set the alarm level automatically or manually. to decide. In the case of the automatic setting state, the process moves from step 702 to step 703, where the alarm level is automatically calculated for each heater using a predetermined calculation method using the current measurement value from the current detector input circuit 19 as an initial value, and the alarm level is automatically calculated using a predetermined calculation method. Store it in the data storage circuit 27 and step 704
Then, it is determined whether the automatically set alarm level is in confirmation mode or not. If step 704 is NO, step 7
06, step 704 is YES or step 70
If it is determined that 2 is manual, the heater alarm level is set manually or by communication in step 705, and the process moves to step 706, where it is determined whether or not the set data is to be stored in the memory area data storage circuit 23. Step 70
If 6 is NO, the process ends, and if YES, the process is stored in the memory area data storage circuit 23 in step 707, and the process ends.

[0024] Through the above processing, the initial setting of the heater alarm level is completed and preparations for starting operation are completed. The subsequent startup and operation of the temperature controller is the same as in the conventional case, so the explanation thereof will be omitted. As described above, the alarm level setting device of the present invention is provided with the previous data storage circuit 27 that stores the drive current value to the heater at the time of the previous startup, and stores the measured current value from the current detector input circuit 19 at the time of startup. are compared by the data comparison circuit 25, and if they are the same, the previous alarm level is set;
If it is the same, it is possible to automatically set the alarm level based on other data stored in advance in the memory area data storage circuit 23, or to set it newly from the input circuit 13. Therefore, in the temperature controller, it is possible to easily check the alarm level and set the alarm level for each of the plurality of control channels when the power is turned on, and the operability of the temperature controller is improved.

Moreover, since automatic and manual mode settings are possible, the heater burnout alarm level can be reliably and precisely set according to the operator's selection. Furthermore, since it has the memory area data storage circuit 23, it is possible to automatically set a plurality of types of alarm levels just by specifying the memory area number. When the above-described embodiment is the first configuration, the present invention can also have the following second to fourth configurations. That is, in the second configuration, in FIG. 5 described above, a learning data storage circuit 28 that can store the reference power supply voltage value from the input circuit 13 under the control of the control circuit 11 is provided,
Determine the deviation from the drive current value from the current level storage circuit 21 and the reference power supply voltage value from the learning data storage circuit 28,
Setting alarm level from data comparison circuit 25 and input circuit 1
The control circuit 11 is configured to correct the alarm level from 3 according to the deviation thereof. Moreover, the control circuit 1
1, in addition to the set alarm level from the data comparison circuit 25 and the alarm level from the input circuit 13, the measurement input circuit 17
It also has the function of calculating an alarm level from the measured value and drive current value from the current level storage circuit 21, and also making correction based on the deviation thereof.

In such a second configuration, for example, the control circuit 11 compares the reference power supply voltage value set via the input circuit 13 and the power supply voltage value actually measured by the power supply voltage measuring circuit 15, It is possible to correct the alarm level by the deviation from the reference power supply voltage value so that the alarm level does not change due to fluctuations in the power supply voltage. for example,
When the power supply voltage is 100V, the drive current to the heater is 10A.
Therefore, if the power supply voltage drops to 85V and becomes 8.5A, an alarm output will be issued if the alarm level is set to 9A. In this case, the control circuit 11 performs a correction calculation on the alarm level [9A x (85V/100V)],
Correctly set the alarm level 9A to 7.65A. However, the control circuit 11 performs a correction calculation [8.5A×(100/85
V)] and correct the detected current value to 10A.

With the configuration in which the control circuit 11 measures fluctuations in the power supply voltage and corrects the alarm level or detected current value, false alarms due to fluctuations in the power supply voltage can be avoided. Furthermore, since the resistance value of the heater, which is the controlled object, changes as the temperature rises, it is necessary to measure the drive current after the temperature of the heater rises and reset the alarm level in order to ensure an alarm action that matches the controlled object. There is. Therefore, as a third configuration, the set alarm level from the data comparison circuit 25 is set as the start-up alarm level at the time of start-up, and after a predetermined time has elapsed after the start-up, the set alarm level is set as the start-up alarm level based on the drive current value from the current level storage circuit 21. It is preferable that the control circuit 11 is configured to output an alarm level, and that the startup alarm level or the post-startup alarm level can be selectively set after a predetermined period of time based on an instruction from the input circuit 13. That is, the control circuit 11 is made to function as a means for outputting an alarm level at startup or an alarm level after startup, and a means for setting them.

In this third configuration, the timing for measuring the drive current after the heater temperature rises is as follows: (1) When the operator confirms stable operation after the temperature rise and issues a manual instruction from the input circuit 13; (2) When the control circuit 11 automatically issues an instruction after a predetermined set time has elapsed after startup; (3) When the control circuit 11 automatically issues an instruction when the measured value PV reaches nearly 90% of the set value SV is realistic, and the control circuit 11 is configured so that the following first to third setting configurations can be selected based on the selection instructions (1) to (3) from the input circuit 13. Of course, selection of the first to third setting configurations is also performed from the input circuit 13. That is, as a first setting configuration, the alarm level at startup is set from the time of startup measurement to the time of re-measurement, and after the time of re-measurement, the alarm level based on the re-measurement is set.

As a second setting configuration, from the time of start-up measurement to the time of re-measurement, the alarm level at start-up is set, and after the time of re-measurement, the parameters of the measured value PV are set from the measurement results at start-up and re-measurement. Recalculate and set the heater alarm level as follows. As a third setting configuration, the alarm level is set to be lowered by approximately 10%, taking into account that the heater current decreases due to an increase in heater resistance due to temperature rise from the time of start-up measurement to the time of re-measurement. After measurement, settings are made in the first or second setting configuration. In this way, with the third configuration, it is possible to ensure an alarm operation that matches the control situation of the controlled object.

Next, in the fourth configuration, under the control of the control circuit 11, the measurement input circuit 17 and the current detector input circuit 19
A learning data storage circuit 28 is formed such that temperature measurement values and drive current values from the learning data storage circuit 28 can be stored periodically, and the measurement values and drive current values in the learning data storage circuit 28 are read out periodically, and each time they are read, A control circuit 11 is formed to calculate and set the alarm level.

In such a fourth configuration, the measured value PV and drive current data are periodically stored and learned while the temperature of the heater is rising, and the data is learned based on the stored measured value PV versus drive current data. It is also possible to set the alarm level during the next control, and based on the previous learning results, an accurate alarm level can be automatically set under stable operation after startup. However, since the drive current data stored in the learning data storage circuit 28 is data that is constantly used during subsequent control, the drive current data is data that has been corrected by the control circuit 11 for power supply voltage fluctuations based on the deviation from the reference power supply voltage value. It is preferable that That is, it is preferable that the control circuit 11 has a function of correcting the power supply voltage and storing it in the learning data storage circuit 28. Incidentally, it is preferable that the third configuration described above also has a function of correcting the power supply voltage fluctuation amount based on the deviation from the reference power supply voltage value by the control circuit 11 and setting the alarm level.

[0032]

As explained above, the first configuration according to the present invention stores in advance the drive current value at the time of starting corresponding to the controlled object, and stores the drive current value at the time of starting for the controlled object and its memory drive. The current values are compared, and if they are the same, an alarm level related to the memory drive current is set, and if they are the same, another alarm level is set based on the instruction from the input means, so the temperature controller can control the current values. Not only is it easy to set the alarm level for a target, but it can also be set automatically. Therefore, for example, when controlling the temperature of the same control target configuration as the previous day, the same alarm level as the previous day is automatically set, and it is easy to confirm, and it is also possible to change the configuration to a control target different from the previous day. Even if there is, it is easy to change the alarm level setting. In the second configuration of the present invention, even if the power supply voltage fluctuates, the alarm level is corrected according to the fluctuation, so an accurate alarm level is always set and false alarms due to power supply voltage fluctuations are avoided. can. In addition, in the third configuration of the present invention, it is possible to automatically set an alarm level suitable for the controlled object based on the measurement results after a predetermined period of time has elapsed from startup, and correct the alarm level according to fluctuations in the power supply voltage to prevent errors. Warnings can be avoided. Furthermore, in the fourth configuration of the present invention, the alarm level of the controlled object can be automatically set based on the measurement results and drive current values stored in advance, and the alarm level can be corrected according to fluctuations in the power supply voltage to prevent errors. Warnings can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a complaint correspondence diagram showing a first configuration of an alarm level setting device according to the present invention.

FIG. 2 is a complaint correspondence diagram showing a second configuration of the alarm level setting device according to the present invention.

FIG. 3 is a complaint correspondence diagram showing a third configuration of the alarm level setting device according to the present invention.

FIG. 4 is a complaint correspondence diagram showing a fourth configuration of the alarm level setting device according to the present invention.

FIG. 5 is a block diagram showing an embodiment of the alarm level setting device according to the present invention.

FIG. 6 is a flowchart illustrating the operation in the first configuration of the present invention.

FIG. 7 is a flowchart illustrating the operation in the first configuration of the present invention.

FIG. 8 is a block diagram illustrating a temperature controller equipped with the alarm level setting device of the present invention.

FIG. 9 is a block diagram illustrating a conventional general temperature controller.

FIG. 10 is a circuit diagram showing the wiring of a heater driven by three-phase alternating current.

[Explanation of symbols]

1 Temperature controller 3 Controlled object (heater) 5 Temperature sensor 7 Heater operating device 9 Power supply 11 Alarm level setting means, alarm level output means at startup, alarm level output means after startup (control circuit) 13 Input means (input circuit) 15 Power supply voltage detection means (power supply voltage measurement circuit) 17
Measurement input circuit 19 Current detector input circuit 21 Current level storage circuit 23 Memory area data storage circuit 25 Alarm level setting means, startup alarm level output means (data comparison circuit) 27 Storage means (previous data storage circuit) 28 Storage means ( Learning data storage circuit) 29 Circuit welding alarm output circuit 31 Heater burnout alarm output circuit 33 Output circuit 35 Display circuit 37 Heater burnout determination circuit 100, 400 Current detection means 101, 200, 303 Input means 102, 201, 304, 402 Storage means 103,
204, 302, 403 Alarm level setting means 104
, 203, 305, 404 Power supply voltage detection means 300
Startup alarm level calculation means 301 Post-startup alarm level calculation means 401 Measurement means 405 Power supply voltage correction means CT Current transformer T Step-down transformer

Claims (6)

[Claims] 1. Current detection means for detecting a drive current value from a power source to a controlled object; input means for inputting and instructing at least an alarm level for detecting an abnormality in the drive current to the controlled object; and the controlled object. a storage means that stores in advance a drive current value at the time of startup corresponding to the above; and at the time of startup, the drive current value detected by the current detection means is compared with the drive current value of the storage means to determine the startup state; When it is determined that the starting state is the same as the driving current value of the storage means, an alarm level is set based on the driving current value of the storage means, and when it is determined that the starting state is different, another alarm level is set based on the instruction of the input means. An alarm level setting device for a controlled object, comprising: alarm level setting means for setting the alarm level. 2. Input means for inputting at least a reference power supply voltage value, storage means for storing the reference power supply voltage value, power supply voltage detection means for detecting a power supply voltage value applied from the power supply to the controlled object, and the control device. Alarm level setting means for correcting and setting an alarm level for detecting an abnormality in the drive current to the target according to a deviation between the detection value from the power supply voltage detection means and the reference power supply voltage value. An alarm level setting device for a controlled object, characterized in that: 3. Start-up alarm level output means for outputting a start-up alarm level for determining an abnormality in the drive current value to the controlled object at the time of start-up, and a start-up alarm level output means for outputting a start-up alarm level for determining an abnormality in the drive current value to the controlled object at the time of start-up; a post-startup alarm level output means for outputting a post-startup alarm level for determining the abnormality based on the current value; and a post-startup alarm level output means that outputs the start-up alarm level at the time of start-up, and the start-up alarm level or the post-startup alarm level after the elapse of the predetermined time. A control characterized by comprising: an alarm level setting means for setting an alarm level; and an input means for externally selectively inputting the setting of the alarm level at startup or the alarm level after startup after the elapse of the predetermined time in the alarm level setting means. Target alarm level setting device. 4. A storage means that stores a reference power supply voltage value in advance, and a power supply voltage detection means that detects a power supply voltage value applied from the power supply to the controlled object, and the alarm level setting means is configured to detect the power supply voltage. 4. The alarm level setting device for a controlled object according to claim 3, wherein the alarm level is corrected and set according to a deviation between a detected value from the means and a reference power supply voltage value from the storage means. 5. Current detecting means for detecting a driving current value from a power source to a controlled object, measuring means for measuring temperature in the controlled object, and periodically detecting the measured value and the driving current value during control of the controlled object. an alarm level for sequentially setting an alarm level for detecting an abnormality in the drive current to the controlled object according to the transition of the measured value and the drive current value stored in the storage means in advance; An alarm level setting device for a controlled object, comprising: a setting means. 6. The storage means stores a reference power supply voltage value, and includes a power supply voltage detection means for detecting a power supply voltage value applied from the power supply to the controlled object, and a detection value from the power supply voltage detection means. 6. The alarm level setting device for a controlled object according to claim 5, further comprising power supply voltage correction means for correcting said power supply voltage value in accordance with a deviation from a reference power supply voltage value from said storage means and storing the corrected power supply voltage value in said storage means.