JP2508539Y2 - Temperature recorder - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature recording device used for recording the temperature inside a refrigerator of a marine container refrigeration system.

[0002]

2. Description of the Related Art As shown in FIG. 4, an automatic equilibrium type temperature recorder used in a conventional marine container refrigerating device, etc.
Servo amplifier (servo amplifier) 2 whose temperature sensor 5 signal is input to one terminal via amplifier (amplifier) 1
And a deviation output is supplied from the servo amplifier 2 to drive a recording pen (not shown), and a potentiometer 4 which is connected to the servo motor 3 and which feeds back a signal indicating the position of the recording pen to the other terminal of the servo amplifier 2. It consists of and.

In the above structure, the internal temperature TS is detected by the temperature sensor 5 and amplified by the amplifier 1,
Output to servo amplifier 2. The servo amplifier 2 compares and amplifies the internal temperature TS with the feedback temperature TP fed back from the potentiometer 4, outputs a deviation e signal thereof, and drives the servo motor 3. Along with the drive of the servo motor 3, the recording pen keeps the internal temperature TS.
When it is moved to the position indicated by, the feedback temperature TP from the potentiometer 4 is equilibrated with the internal temperature TS, so that the deviation e output from the servo amplifier 2 becomes zero and the servo motor 3 is stopped. Thus, the temperature inside the refrigerator is recorded.

[0004]

In the above-mentioned conventional temperature recording apparatus, when the potentiometer 4 fails and the feedback signal and the servomotor become abnormal, there is no means for judging the presence / absence of this abnormality. We could not properly judge the failure of item 4 and repair it quickly.

The present invention has been made in view of the above circumstances.
The present invention provides a temperature recording device equipped with a potentiometer feedback device and a device for determining whether or not there is an abnormality in a servo motor.

[0006]

The present invention has been made to solve the above-mentioned problems, and the gist thereof is that a signal of a temperature sensor is input to one input terminal and a potentiometer is connected to the other input terminal. In a temperature recording device equipped with a servo amplifier to which a feedback signal of is input, and a servo motor to which an output terminal of the servo amplifier is connected and the potentiometer is connected and which is provided with a recording pen,
When the deviation does not fall within an allowable value within a predetermined time from the time when a deviation occurs between the signal value of the temperature sensor and the feedback signal value of the potentiometer, a determination means for determining that the feedback signal and the servo motor are abnormal is provided. The temperature recording device is characterized by being provided.

[0007]

Since the present invention has the above-mentioned structure, the temperature inside the refrigerator input to the servo amplifier detected by the temperature sensor and the feedback temperature input from the potentiometer to the servo amplifier are different from each other for a predetermined time. If the deviation does not fall below the permissible value, it is determined that the feedback temperature, that is, the feedback signal and the servomotor are abnormal.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the temperature recording apparatus of the first embodiment, and FIG. 2 is a control flowchart of the same embodiment.

The deviation signal output from the servo amplifier 2 is input to the controller 10, and the controller 10 determines the feedback signal of the potentiometer 4 and the presence / absence of an abnormality of the servo motor 3, and the alarm means 16 notifies that fact. It has become so. Other configurations are the same as those of the conventional one shown in FIG. 4, and the same parts as those in FIG.

Therefore, the internal temperature TS which has been constantly changed
When the temperature rises or falls, the internal temperature TS is detected by the temperature sensor 5, amplified by the amplifier 1, and then input to the servo amplifier 2. In the servo amplifier 2, the internal temperature TS and the feedback temperature TP input from the potentiometer 4 are compared to generate a deviation e, and this deviation e signal is amplified and output.

Deviation e output from the servo amplifier 2
The signal is input to the comparison means 11 of the controller 10, and here the set value (for example, ± 0.2) input from the setting means 12 is input.
C)).

When the deviation e exceeds the set value, a signal is input from the comparison means 11 to the output means 13, and the servomotor 3 is driven based on the command from the output means 13.
As a result, the servomotor 3 is driven until the feedback temperature TP of the potentiometer 4 equilibrates with the internal temperature TS.

When the deviation e exceeds the set value, a signal is input from the comparing means 11 to the timer 14, where time counting is performed until a predetermined time signal elapses. Timer 14 here
For example, the time required to drive the servomotor 3 in the case where the maximum temperature fluctuation occurs in the interior (in other words, the deviation e between the interior temperature TS and the feedback temperature Tp).
Until it reaches zero), or longer than this.

When the deviation e exceeds the set value, the timer 14
When you start counting and count up, this message
The number is transmitted to the discrimination means 15. The discriminating means 15 is a feed bar.
Check that the check signal and the servo motor are abnormal.
The effect is reported through the alarm means 16. Thus,
Accurately judge the failure of tension meter 4 and servo motor
To be done.

On the other hand, when the deviation e is within the set value
Is not counted by the timer,
The number is transmitted to the discrimination means 15. Discriminator who input this signal
Step 15 determines that the deviation e is within the allowable value
And the feedback temperature T _P , that is, the feedback signal
Also, it is determined that the servo motor is normal.

A second embodiment is shown in FIG.
Here, the deviation e signal output from the servo amplifier 2 is input to the controller 20, and the controller 20 determines whether or not there is an abnormality in the feedback signal and the servo motor 3. Here, in FIG. 3, the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

The deviation e signal output from the servo amplifier 2 is input to the comparison means 21 of the controller 20,
Here, the set value input from the setting means 22 (for example, ± 0.
2 ° C).

When the deviation e exceeds the set value, the comparison means 21
From the above, a signal is input to the calculation means 23, and the required time t0 of the servomotor 3 is calculated based on the data input from the storage means 24. Here, the storage means 24 stores a calculation means for determining the drive time of the servo motor 3 required to make the deviation e zero according to the value of the deviation e.

When the deviation e exceeds the set value, the comparing means 21 outputs it to the output means 25. Then output means
The servomotor 3 is driven based on the command from 25 and is output to the integrating means 26, where the potentiometer 4
The driving time of the servomotor 3 driven until the feedback temperature TP of the above is balanced with the internal temperature TS of the refrigerator is integrated.
This integrated time t is input to the discriminating means 27 and compared with the required drive time t0 input from the calculating means 23.

Here, the integrated time t _{and the} required drive time t0 are
If the difference is within a predetermined time , the determining means 27 determines that the feedback signal is normal.

On the other hand, the integration time t and the required drive time t0
If the difference exceeds a predetermined time (when the deviation e is not zero within a predetermined time in other words), discriminating means 27 discriminates the feedback signal and the servo motor is abnormal, the warning means to the effect that _this Report through 28.

Although the deviation e signal output from the servo amplifier 2 is detected in the above-described first and second embodiments, the internal temperature T input to the servo amplifier 2 is detected.
It is also possible to detect the deviation e signal from S and the feedback temperature TP.

[0023]

As described above, according to the present invention, a predetermined time has elapsed from the time when the temperature inside the refrigerator detected by the temperature sensor and the feedback temperature input from the potentiometer to the servo amplifier differ. When the deviation is not within the allowable value, the feedback temperature, that is, the determination means for determining that the feedback signal and the servomotor are abnormal, is provided, so that the presence or absence of the potentiometer failure can be accurately determined. Can be repaired quickly.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a temperature recording apparatus according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a control flow of the temperature recording apparatus according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a temperature recording device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional temperature recording device.

[Explanation of symbols]

1 ... Amplifier (amplifier), 2 ... Servo amplifier, 3 ... Servo motor, 4 ... Potentiometer, 5 ... Temperature sensor, 10,
20 ... Controller, 11, 21 ... Comparison means, 12, 22 ... Setting means, 13, 25 ... Output means, 14 ... Timer, 15, 27 ... Discrimination means, 16, 28 ... Warning means, 23 ... Calculation means, 24 ... Storage means,
26… Means of multiplication.

Claims (1)

(57) [Scope of utility model registration request] 1. A servo amplifier, to which a temperature sensor signal is input to one input terminal and a feedback signal from a potentiometer is input to the other input terminal, and the potentiometer are connected, and the output signal of the servo amplifier is received for recording. In a temperature recording device equipped with a servo motor for driving a pen, when the deviation of the signal value of the temperature sensor and the deviation of the feedback signal value of the potentiometer does not fall below a permissible value within a predetermined time, A temperature recording device, characterized in that a determination means is provided for determining that the feedback signal and the servomotor are abnormal.