JPH01297702A - Meter adjusting device - Google Patents

Abstract

PURPOSE:To realize automatic adjustment by performing the adjustment of output by feeding back a control signal in a meter adjusting device which outputs the control signal of a control motor. CONSTITUTION:A relay 10 at an open side or a relay 11 at a closed side is driven by a signal with a high level or a low level outputted from a dead zone comparator 9, and the control motor 12 is rotated in a forward or a backward direction. At this time, the signal with the high level or the low level outputted from the dead zone comparator 9 is fetched in a CPU via an input/output port 5, and an input adjusting means 41A performs the output adjustment of the control signal outputted from the control motor 12 by a fetched control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adjusting device for a meter such as a controller that outputs a control signal for a control motor.

[Conventional technology]

Fig. 2 is a configuration diagram of a conventional meter adjustment device. In the figure, 1 is a CPU, 2 is a display, 3 is a keyboard, and 4
is a memory, 5 is a human output board for transmitting and receiving signals with the outside, 6 is an isolation circuit that insulates signals output to the outside, 7
A D/A converter converts a digital signal outputted from the input/output port 5 via the isolation circuit 6 into an analog signal.

8 is a difference calculation circuit that takes the deviation of the signal, 9 is a Ted zone comparator, 10 is an open side relay 11 is a close side relay, 12 is a control motor, 13 is a position detection circuit that detects the rotational position of the control motor, 14 is a position This is an adjuster comprised of a trimmer and the like that adjusts the signal from the detection circuit 13 to match the output range IC.

Further, 41 is a control program stored in the memory 4.

Next, the operation will be explained.

After turning on the power and operating the keyboard to set predetermined initial conditions such as range settings, PID control of the control motor 12 that controls the opening and closing of control valves etc. is performed.
A control signal for controlling opening and closing of the control motor is output from the human output boat 5.

This control signal is insulated by an insulating circuit 6, and then converted into an analog control signal by a D/A converter 7, and a difference calculation circuit 8 detects the rotational position of the control motor 12 and outputs the detected value from the adjusted regulator 14. The deviation between the signal and the D/A converter 7 is calculated and output to the dead zone comparator 9.

The dead zone comparator 9 outputs a high level or low level control signal according to the deviation. At this time, if a high level signal is output, the open side relay is driven and the control motor 12 rotates in the forward direction, and if a low level signal is output, the close side relay is driven and the control motor 12 is rotated. Rotate in the opposite direction.

Here, the CPU 1 outputs a control output signal obtained as a result of the PID control calculation via the input/output port 5, and the rotation of the control motor 12 is controlled so that it is at a position corresponding to the value.

On the other hand, the CPUI displays values corresponding to control signals output to the input/output board 5 on the display 2.

However, before performing such control of the control unit 12, it is necessary to adjust the device detection signal constituted by the position detection circuit 13 using the regulator 14. The reason for this will be explained using FIG. 3.

FIG. 3 is a diagram showing an outline of the position detection circuit. As shown in the figure, the position detection circuit is constructed using a slide type variable resistor, and the slide moves in accordance with the rotational position of the control motor 12, and rotates. It outputs a signal corresponding to the position.

This sliding type resistor can only move within the range (B) shown in Figure 3 due to its mechanical properties, and this range is electrically normalized from 0 to 100% as shown in (A). Different from range.

Therefore, even if the D/A converter 7 outputs a control signal indicating 0%, it will not reach the end 1a of the range (A), and will not reach the end 1a of the range (A).
It is possible to move only to the end 1b of B).

For this reason, adjustment is made so that the control signal slides within the range (B) when a control signal of 0 to 100% is output from the CPUI.

(Problem to be Solved by the Invention) Since the conventional meter adjustment device was constructed as described above, the problem of spending a lot of time in adjusting the meter was solved.

Furthermore, in the case of instruments, the installation location of the output regulator and the installation location of the position detection circuit are often far apart, which requires people who are more than 2 Å apart to make adjustments by talking to each other, which is a time-consuming problem. There was a point.

This invention was made to solve the above-mentioned problems, and aims to provide an adjustment device that automatically performs adjustment without consuming manpower or time.

[Means to solve the problem]

The adjustment device according to the present invention is characterized in that an adjustment means for automatically adjusting the position detection signal by feeding back the control signal is provided in the control program.

[For production]

The adjustment means in this invention feeds back the control signal and takes it into the CPU.

Based on the control signal taken into this CPU, the CPU
Adjusts the output of the control signal to be output from U.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing one embodiment of this invention.
1A is a control program 41 which adjusts the output of the control signal output from the CPU 1 by feeding back the control signal, thereby adjusting the signal from the position detection circuit.
It is an adjustment means provided within.

Detection of this control signal is performed by taking in a high level or low level signal output from the dead zone comparator 9 into the CPU i via the human output port 5.

Note that the same components as those in the prior art are given the same numbers and their explanations will be omitted.

Next, the operation will be explained.

The oven side relay 10 or the close side relay 11 is driven by the low level or low level signal output from the dead sone comparator 1 node 9, and the control motor 12 is rotated in the forward or reverse direction.

, '-(7) The high level or low level signal output from the time zone comparator 9 is taken into the CPU via the human output boat 5, and the human power adjustment means 41A uses this taken in control signal. The output of the control signal output from the control motor 12 is adjusted.

This output adjustment will be explained in detail.

First, a control signal indicating 0% is output from the CPU, and the control motor 12 rotates to the 0% side and maintains this state until it reaches the end 1b in FIG.

At this time, the close side relay 11 is in the ON state.

At this point, the value of the control signal output from the CPU is gradually increased, and the value a when the close side relay 11 turns OFF is
get.

Further, the CPU 1 outputs a control signal indicating 100%, and the control motor 12 rotates toward the 100% side, maintaining this state until reaching the end IC in FIG. 3.

At this time, the oven side relay 10 is in the ON state.

Here, the value of the control signal output from the CPU 1 is gradually lowered to obtain the value when the oven side is L/-10 or OFF.

The value t actually output for the control signal M calculated by the CPU using these values a and b is as follows. By doing this, the voltage between lb and Ic of the detection circuit 13 is 0 to
It is equivalent to 100%.

Moreover, this percentage can be set to an arbitrary value.

These series of operations are first performed by the control program 41.

Note that the values a and b may be set freely by the operator using the keyboard 3 provided on the front of the instrument.

〔Effect of the invention〕

As explained above, the present invention includes a manual adjustment means in the control program that adjusts the signal from the position detection circuit by feeding back the control signal and automatically adjusting the output of the control signal. This has the effect of automatically adjusting the output without requiring manpower or time.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an output adjustment device showing an embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional output adjustment device, and FIG. 3 is a diagram showing a conceptual diagram of a position detection circuit. 1...CPU, 2--Display. 3...Keyboard, 4...Memory. 5...Person output port, 6...Isolation circuit. 7-...D/A converter. 8...Difference calculation circuit. 9...Ted zone comparator. 10.--Oven side relay. 11.--Close side relay. 12...Control motor. 13...Detection circuit. 14...Adjuster. 41A... Adjustment means.

Claims (1)

[Claims] When outputting a control signal for controlling the control motor according to a control calculation result, the rotational position of the control motor is controlled by feeding back a detection signal from a detection circuit that detects the rotational position of the control motor. What is claimed is: 1. A meter adjusting device comprising: a control program having an adjusting means for automatically adjusting the output of the control signal by feeding back the control signal.