JP2513978Y2 - Abnormal speed detector of speed control device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a speed control device using a remote-controlled speed setter, and more particularly to a speed control device capable of performing speed discrimination according to the operation situation after a driving operation. The present invention relates to an abnormal speed detector.

[Conventional technology]

In a speed control device or the like, a speed setting device that gives the speed setting signal is of an electric drive type in which a variable resistor is combined with a reduction mechanism and a pilot motor, or an electronic circuit configuration such as an oscillator and an up / down counter is used. A remote-controlled speed setter that is driven by a remote-controlled acceleration / deceleration command is widely used.

As an abnormal speed detector of a speed control device using such a remote-controlled speed setter, those shown in FIGS. 5 and 6 are generally applied.

FIG. 5 shows the main configuration of the first conventional example. 1 is a motor driven by a power converter 2, 3 is a speed detector of the motor 1, 4 is a remote-controlled speed setter, 5, 5'is a computing unit,
6 is a speed control amplifier, 7 is a current control amplifier, and 8 is a comparator.

Here, the comparator 8 is used as an abnormal speed detector. Further, the remote-controlled speed setter 4 is called an electric setter, and has a pilot motor PM driven by a speed increase signal U and a speed decrease signal D as external signals, and a speed reducer (not shown) by the pilot motor PM. ) And the position detectors LS ₁ and LS ₂ for performing the protective operation of the pilot motor PM and the operation stop conditions such as operating at the maximum and minimum of the setter RH.

Since such a configuration and its function are known, a detailed description thereof will be omitted. However, the speed setting signal of the output of the remote control type speed setter 4 and the actual speed of the output of the speed detector 3 are compared by the calculator 5 and compared. The speed deviation of the output of the device 5 is the speed control amplifier 6
The output of the speed control amplifier 6 is input to the comparator 8. Here, the comparator 8 compares the difference set value and the deviation amplification input value to make an abnormality determination, and obtains a speed abnormality detection signal.

FIG. 6 shows the structure of the main part of the second conventional example, which is 8 '.
Is a comparator which receives the output of the arithmetic unit 5. 5th in the figure
The same reference numerals as those in the figure indicate the same components.

Here, the operational amplifier 9 and the comparator 8'have the same functions as the speed control amplifier 6 and the comparator 8 shown in FIG. 5, and the operational amplifier 9 is provided separately from the speed control amplifier 6 in the comparator 8. It is attached for the purpose of '.

As described above, in both of FIGS. 5 and 6, the speed deviation is signal-amplified and given, and the comparators 8, 8 '
Since it is determined whether or not the abnormal value is equal to or greater than the set value, the method for detecting abnormality is used.

[Problems to be solved by the device]

However, in the conventional device as described above, a driving operation status different from the operation status occurs in the remote control type speed setting device itself due to mechanical trouble or malfunction of circuit parts.
This is as follows.

That is, the position detectors LS ₁ , LS attached to the setting device RH
_{According to 2} , for example, the one that performs the stop operation by inducing the minimum position detection condition will not stop forever if it does not decelerate despite the deceleration or stop operation, which may lead to machine damage or personal injury, which is extremely dangerous. is there.

And since it is only performed with the speed setting signal and the actual speed, if the setting and feedback do not move even if the acceleration / deceleration operation or deceleration stop occurs due to a malfunction of the setting device itself, there is an error. Cannot be determined, and the result is that the driving operation state remains as it is and is erroneous.

As described above, it is not possible to connect the lapse of time with the operation, and therefore, it is not possible to detect an abnormality in accordance with the operation time of the setting device.

[Means for solving the problem]

The present invention has been made in view of the above-mentioned points, and is currently "acceleration / deceleration?", "Constant speed?"
Further, a speed operation determination means for determining the speed difference is provided, a speed storage means for speed determination after the next operation and a difference level adjustment comparison means are provided, and the current speed is stored to determine the abnormality. . Furthermore, the relay circuit means for assembling the operational conditions is used as a logical OR configuration with the abnormal value judgment output to obtain both the operation and the movement of the speed that has to change, and detect the abnormal speed exceptionally. It generates a signal.

[Action]

With such a solution means, specifically, the speed operation determination means capable of adopting a simple analog-type ramp function circuit stores the actual speed at that time as a constant speed, and moves the remote-controlled speed setter during acceleration / deceleration. It is used as a set that operates a little later than the time, and the comparison means can always obtain the driving state determination suitable for the operation (for example, during deceleration during deceleration operation) immediately after the change of the driving operation.

〔Example〕

FIG. 1 and FIG. 2 show the main construction of an embodiment of the present invention. FIG. 1 shows the speed control device similar to FIG. 5 and FIG. 6, and FIG. The abnormal speed detector is shown. Further, FIGS. 3 and 4 show the signal level of each part and the operation at that time in the normal and abnormal states of this embodiment.

That is, as shown in FIG. 1 and FIG. 2, the abnormal speed detector 10 having the output of the speed detector 3 as an input includes a speed operation determination circuit 101, comparators 102a and 102b, and relay circuits 103a and 1a.
03b and a delay circuit 104. Where the delay circuit
Reference numeral 104 denotes the condition operation signal delayed by the speed increase signal U and the speed increase signal D by the timers S4 and S4 ', and the relay circuit 10 as described later.
It acts to give to 4a, 104b.

The function of such a configuration will be described below with reference to FIGS. 3 and 4.

Now, the speed operation determination circuit 10 shown in the ramp function circuit example
In order to store the current speed, 1 is stored as a memory speed S ₁ ′ with respect to the actual speed S ₁ of the speed detector 3 output.

Here, in order to simplify the explanation, the acceleration / deceleration time of the load operated by the motor 1 is almost the same as that of the remote-controlled speed setter 4.
As long as it follows the movement time of the setter RH of, the time setting of the ramp function can be set in the regulators VRU, VRD,
Therefore, the memory speed S ₁ ′ as shown in FIG. 3A is obtained by adjusting the actual speed S ₁ so as to be slightly slower than the acceleration / deceleration time.

Further, by doing so, the speed operation determination circuit 10
In 1, the output signal S ₂ of the amplifier AMP at the preceding stage operates as shown in FIG. 3 (b) during acceleration / deceleration and constant speed, and by monitoring this output signal S ₂ (whether it is accelerating?) ，
It is possible to judge (whether the vehicle is decelerating?) Or (is it operating at a constant speed?).

That is, in the comparators 102a and 102b, the bias adjuster V
A relay circuit that can send the result as an external signal by setting the difference value with RLU and VRLD and making a judgment.
3a and 103b are provided for constant monitoring. Here, the conditions established immediately after the driving operation condition and the operation change, 'a, the result of the aggregation condition operation signal S _4, S _4' timer S4, S4 of as the delay circuit 104 shown Assuming that obtained as, relay circuit 103a, in 103b, the series connection of the detection result of the relay X _1, X ₂ and the aforementioned condition operation signal S _4, and S ₄ ', to check the speed status that suits an operation state, the relay Y _1, Y _It is possible to judge the abnormality as ₂ and send out the abnormal speed detection signals S ₅ and S ₅ ′.

This, in FIGS. 3 and FIG. 4, in the driving operation after the timer S4, S4 set checkpoint for a predetermined time T ₁ at ', whether or not operation is a criterion of normal or abnormal.

In FIG. 3, the operation acceleration operation is performed at time T, and the deceleration stop operation is performed at time T ′. In the deceleration stop operation, the actual speed S ₁ is the same as the speed setting. It is assumed that the vehicle has slowed down.

The memory speed S ₁ ′ in the speed operation control circuit 101 also decreases due to the decrease of the actual speed S ₁ , but the time is made slightly slower than that of the setter by the regulator VR _D. Therefore, a difference occurs in the input as the speed operation determination signal, and this is given as the output signal S ₂ as an input for performing the abnormal level detection comparison in the latter stage while the negative deceleration is being performed.

Level is set state as previously difference value in the comparator 102a, since given the more input is output as determination signal S ₃ during deceleration just as the relay circuit 103a, the relay X ₁ It is given as a drive signal.

On the other hand, the driving operation condition is given as the condition operation signal S ₄ of the external condition when a predetermined time T _{1 has} elapsed after the deceleration stop operation. Therefore, because this is at the point B contact of the relay X ₁ than during deceleration is open, the abnormality detection signal S ₅ by relay Y ₁
Remains open.

Further, in FIG. 4, assuming that the deceleration stop operation is also performed at the time point T ′, if the pilot motor PM does not move due to some trouble and the setting cannot be changed, the actual speed S ₁ is also changed. The actual speed and the memory speed do not change because the memory speed S ₁ ′ remains unchanged.

Therefore, the output signal S ₂ of the speed operation determination signal does not change, the comparator 102a does not rise to the operation level, and the determination signal S ₃ remains detecting the constant speed state.

On the other hand, when the conditional operation signal S ₄ is given, the logical product is obtained without driving the relay X ₁ , and the relay Y ₁ operates at this point. Therefore, although the deceleration operation is performed, the deceleration operation is not performed at the actual speed, but the abnormality can be detected.

It is obvious that acceleration detection can be performed as well as the abnormality detection function during deceleration as described above. Furthermore, for abnormality detection in the range of constant speed, by monitoring such deceleration abnormality detection signal and acceleration abnormality detection signal, for example, when both operations are not performed By adding a relay circuit, the determination can be easily performed, and the safety can be further increased.

[Effect of device]

As described above, according to the present invention, it is possible to provide an actual speed memory function, which is slightly slower than the setter moving time in time, by a simple speed operation determination means, and if the expected operation state is not achieved together with the peripheral circuit after the operation operation is changed. It is possible to provide a device having a remarkable practical effect that can perform abnormality determination especially and detect an abnormality not only when the setter body is defective but also when the process for operating them is defective.

[Brief description of drawings]

1 and 2 are a system diagram of a speed control device and a system diagram of an abnormal speed detector thereof showing the essential configuration of an embodiment of the present invention, and FIGS. 3 and 4 are FIGS. 1 and 2. FIGS. 5 and 6 are system diagrams showing a conventional example including an abnormal speed detector and another conventional example showing the signal level of each part and the operation at that time point in order to facilitate understanding of the figure. 2 ... Power converter, 3 ... Motor 1 speed detector, 4 ...
… Remote control type speed setting device, 5, 5 '... Computing device, 6 ... Speed control amplifier, 8, 8', 102 ... Comparator, 10 ... Abnormal speed detector, 101 ... Speed operation discrimination circuit , 103 …… Relay circuit, 104 …… Delay circuit, S5, S5 ′ …… Abnormal speed detection signal.

Claims (1)

(57) [Scope of utility model registration request] 1. A remote control type speed setter capable of remotely controlling the speed setting signal, a speed control circuit for generating the speed control signal by obtaining the speed setting signal and an actual speed feedback signal, and the speed control signal. In a speed control device including a drive circuit for driving a motor, a delay circuit that operates in conjunction with an acceleration / deceleration operation command given to the remote-controlled speed setter to generate a delay signal, and the actual speed A speed operation determination circuit that obtains a feedback signal to determine whether the actual speed is an acceleration / deceleration state or a constant speed state, and a comparison signal that gives a determination signal when the output level of the speed operation determination circuit is higher than the difference value setting level And a relay circuit that generates an abnormal speed detection signal by a series circuit of a contact of a relay that operates by obtaining the output of the comparator and a contact of the delay signal, and a speed control characterized by the above-mentioned. Dress Abnormal speed detector.