JPS62124461A - Abnormality diagnosing device - Google Patents

Abstract

PURPOSE:To quickly and exactly detect the abnormality of a speed detector by inputting the output frequency of the speed detector to a pattern generator and inputting the output voltage value of the speed detector to a deviation calculator. CONSTITUTION:The output voltage pattern S11 from the pattern generator 6 and the voltage peak value S11 from a voltage peak value detector 7 are calculated by the deviation calculator 8. The peak value S12 is a normal value while the speed detector 1 is in a normal state and therefore, the deviation S2 is zero. There is a difference between the pattern S11 and the peak value S12 if the peak value S12 is in an abnormal state and therefore, the deviation S4 corresponding to such difference is outputted from the calculator 8. An alarm device 9 detects the deviation S4 and outputs an alarm output S6 and stop signal S7 for a rotating machine. The device 9 outputs the output S6 and the signal S7 when the peak value S12 of the detector 7 is annihilated while the driving signal S12 of the rotating machine is kept outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a speed detector abnormality diagnosing device suitable for diagnosing an abnormality in a speed detector that detects the speed of a rotating machine.

[Technical Background of the Invention] In general, abnormality diagnosis of a speed detector that detects the speed of a single-rotating machine is performed using a single-rotating machine speed request signal and a direct current of an F/V converter that converts a frequency proportional to the actual rotating machine speed into a voltage. Detects the deviation from the voltage output and determines whether this deviation exceeds a given operating value for a certain period of time, or the DC output voltage of an F/V converter that converts a frequency proportional to the actual rotating machine speed into voltage. An abnormality is diagnosed when the rate of change of the signal is monitored and exceeds a predetermined operating value at any given time. The results of this abnormality diagnosis are output as an alarm to notify the operator of the abnormality, and a one-rotation machine stop signal is output to stop the rotary machine.

Fig. 4 shows a conventional example of an abnormality diagnosis device that detects abnormalities in a speed detector based on such a principle. 1 is a speed detection device that detects the actual speed of a rotating machine and outputs an AC voltage output S2. 2 is an F/V converter that inputs the frequency of the AC voltage output S2 of the speed detector 1 and converts it into a DC voltage output S3, S is a rotating machine speed request signal, 3 is a rotating machine speed request signal S1 and Deviation S4 from direct & voltage output S3 of F/V converter 2
A deviation calculator that calculates the change rate S5 at a given time from the DC voltage output S3 of the 41 soil Fc converter; 1jI notification output S due to the fact that the rate of change S5 exceeds the predetermined operating value at any time.
6 and a rotating machine stop signal S7.

If the speed detector becomes abnormal in the configuration shown in FIG. 4, the AC voltage output S2 of the speed detector 1 and the DC voltage output S3 of the F/V converter 2 become abnormal, resulting in a one-rotation machine speed request signal S1.
and the DC voltage output S3 of the F/V converter 2.
is generated and output from the deviation calculator 3. The alarm device 5 outputs an alarm output S6 and a rotating machine stop signal S7 when the deviation S4 continues for a certain period of time at or above a predetermined operating value.

Also, the DC voltage output S3 of the F/V converter 2 is detected by the rate of change detector 4, and the rate of change S5 is output, so the alarm 5 can perform a predetermined operation at any time by obtaining this rate of change S5. When the value exceeds the value, an alarm output S6 and a rotating machine stop signal S7 are output.

[Problems with the Background Art] However, in this conventional device, the predetermined operating value of the rate of change that should be judged as abnormal is the value of the F/V converter when the actual speed of the rotating machine changes significantly under normal conditions. In order to avoid determining that a DC voltage output change is abnormal, it is necessary to set it with some margin, so the operating value inevitably becomes large. Therefore, an abnormality in the rate of change due to a small change below a predetermined operating value cannot be detected until the operating value is reached. In addition, even though the deviation between the rotating machine speed request signal and the DC voltage output of the F/V converter is greater than the operating value, it appears and disappears in a short period of time and remains constant above the operating value. If it is desired to continue for more than a certain period of time, there are cases where the 9th alarm output is not output, and sufficient abnormality diagnosis is not always carried out. Furthermore, this conventional abnormality diagnosis device cannot detect abnormalities quickly because it requires a certain time delay for detection due to its operating principle.

[Object of the Invention] An object of the present invention is to provide a speed detector abnormality diagnosing device that can quickly and accurately detect abnormalities in a speed detector.

[Summary of the Invention] Therefore, the present invention compares the voltage value of the AC voltage output of the speed detector with the output voltage value of the frequency/voltage peak pattern of the AC voltage output in a preset normal state. Anomaly detection is performed by

That is, the voltage value of the output voltage pattern for the frequency of the speed detector in a normal state is compared with the voltage value of the actual AC voltage output of the speed detector when the rotating machine is rotating, and the deviation is determined.
, If the alarm value is greater than or equal to the alarm value, the alarm outputs an alarm and a rotating machine stop signal.

It also monitors the drive signal of the rotating machine and the AC voltage output of the speed detector, and outputs an alarm and a rotating machine stop signal if the speed detector output is lost despite the presence of the drive signal of the rotating machine. do. This makes it possible to quickly and accurately diagnose abnormalities in the speed detector.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration diagram of an abnormality diagnosis device for a speed detector according to an embodiment of the present invention. In the figure.

The same reference numerals as in FIG. 4 indicate the same or corresponding parts.

Further, 6 inputs the AC voltage output S2 of the speed detector 1, and uses the frequency/voltage peak value pattern of the AC voltage output S2, which has been set in advance based on the characteristics when the speed detector 1 is normal. A pattern generator that outputs a voltage peak value corresponding to the frequency of the AC voltage output S2, 7 a voltage peak value detector that inputs the AC voltage output S2 of the speed detector 1 and outputs a voltage peak value S12, 513 a rotation machine drive signal,
8 is a deviation calculator that calculates the output voltage pattern S1r output from the pattern generator 6 and the voltage peak value S12 output from the voltage peak value detector 7, and outputs the deviation S4; 9 is the deviation of the deviation calculator S4 becomes equal to or higher than the alarm operation value, or even if the drive signal S13 of the one-rotation machine and the voltage peak value S12 output from the voltage peak value detector 7 are monitored and the drive signal Ss3 of the one-rotation machine is output. regardless of,
Due to the loss of voltage peak value S12, alarm output S
6 and a rotating machine stop signal S7.

FIG. 2 shows the waveform of the AC voltage output from the speed detector 1. The horizontal axis shows time, and the vertical axis shows AC voltage output. T
is the period of one cycle of the AC voltage output, and S+= is the voltage peak value of the AC voltage output. As the actual speed of the rotating machine increases, the period T becomes smaller and the voltage peak value 512 becomes larger.

FIG. 3 is a characteristic diagram of an abnormality diagnosing device for diagnosing an abnormality in a speed detector according to an embodiment of the present invention.

The horizontal axis shows the frequency of the AC voltage output S2, and the vertical axis shows the voltage value SII of the output voltage pattern and the voltage peak value S12 output from the voltage peak value detector 7.

Further, S+ 2' is the voltage peak value at the time of abnormal increase outputted from the voltage peak value detector 7, 312' is the voltage peak value at the time of abnormal decrease outputted from the voltage peak value detector 7,
X' is the deviation in the increasing direction, and X' is the deviation in the decreasing direction.

In the above configuration, the output voltage pattern S++ from the pattern generator 6 and the voltage peak value S12 from the voltage peak value detector 7 are calculated by the deviation calculator 8, but when the speed detector 1 is in a normal state, the voltage Since the peak value S+2 is a normal value, the deviation S2 is zero. Next, voltage peak value 51
2 is abnormal, there is a difference between the output voltage pattern S++ and the voltage peak value SI2, so the deviation calculator 8 outputs a deviation S4 corresponding to the difference. The alarm 9 captures this deviation S4 and outputs an alarm S6 and a rotating machine stop signal S7.
Output.

Further, when the voltage peak value S12 of the voltage peak value detection value 7 is lost while the rotating machine drive signal S13 is being output, the alarm device 9 outputs an alarm output S6 and a rotating machine stop signal S7. The operation of this abnormality diagnosis will be explained using the characteristic diagram in FIG. 3. When the speed detector 1 is in a normal state, the output voltage pattern 511 of the pattern generator 6 and the voltage peak value 312 of the voltage peak value detector 7 are are in agreement,
Totally overlap. Next, when the speed detector 1 is in an abnormal state, the voltage peak value becomes 312' or 312',
Output voltage pattern Sll by deviation X' or X#
deviates from the The deviation X' or X' is the alarm 9'
S! If the alarm value is exceeded, the speed detector is determined to be abnormal.

In this way, since diagnosis is performed based on the frequency/voltage pattern of the speed detector's AC voltage output under normal conditions, it is possible to instantly detect minute abnormalities in the speed detector and detect abnormalities in the speed detector's output. The situation can be quickly and accurately grasped.

Therefore, it exhibits remarkable effects when applied to abnormality diagnosis of speed detectors such as atomic couplants, which require rapid and accurate accuracy.

[Effects of the Invention] As described above, according to the present invention, abnormalities in speed detectors can be detected quickly and accurately, and highly accurate abnormality diagnosis can be performed, thereby ensuring plant stability and achieving highly reliable speed. A detector abnormality diagnosis device is obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an abnormality diagnosis device for a speed detector according to an embodiment of the present invention, FIG. 2 is an AC voltage output waveform diagram of the speed detector, and FIG. 3 is a speed detector according to an embodiment of the present invention. Characteristic diagram of a detector abnormality diagnosing device, FIG. 4 is a configuration diagram of a conventional speed detector abnormality diagnosing device. 1...Speed detector, 2...F/V converter, 3,8
- Deviation calculator, 4... Rate of change detector, 5, 9...
'W alarm, 6...pattern generator, 7...voltage peak value detector. (731 Kuji←←Tan Agent Patent Attorney Noriyuki Chika (8105
) Hiroshi Mimata
Text Figure 1 S2 Figure 2 52 mini, jimi: nogoieno'1szzsu11ninon;(;し;, --Figure 3 Figure 4

Claims (3)

[Claims] (1) A pattern generator that generates an output voltage corresponding to the frequency of the speed detector in a normal state, the output voltage value of this pattern generator and the output voltage value of the speed detector are input, and the deviation between these is output. comprising a deviation calculator and an alarm to which the output of the deviation calculator is input and generates an alarm output when the input is equal to or higher than a predetermined value, and inputs the output frequency of the speed detector to the pattern generator; An abnormality diagnosis device for a speed detector, characterized in that an output voltage value of the speed detector is input to the deviation calculator. (2) In claim 1, the alarm device is:
An abnormality diagnosis device for a speed detector, characterized in that it generates an alarm output even when the output voltage of the speed detector is lost while a drive signal of a rotating machine to which the speed detector is coupled is output. (3) An abnormality diagnosis device for a speed detector according to claims 1 and 2, wherein the alarm outputs an alarm output and a rotating machine stop signal.