JP3781567B2 - Operation control device for rotating machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation control device for a rotary machine, and more particularly to an operation control device that performs various controls including starting and stopping of a rotary machine such as a pump and a fan.
[0002]
[Prior art]
A pump unit operation control device such as a water supply device using a pump performs various controls including starting and stopping of a rotating machine, and this control is generally configured by microcomputer control by a CPU or the like. is there. Also, for example, in an air conditioner using a rotating machine such as a fan, it is also common to use a CPU or the like for operation control. Taking a pump unit as an example, this control device receives a signal from a manual operation switch or various sensors, the pump is activated, water is supplied, and the operation of the pump is stopped by a manual operation switch or an external signal. The water supply is stopped. Then, pump operation commands or signals from various sensors are collected by the CPU, and output processing such as pump start / stop control and generation of various alarms is performed in accordance with the CPU program.
[0003]
FIG. 3 shows an example of a conventional operation control apparatus using such a CPU. This control device includes a CPU 11 and takes in all input signals such as an external start signal and a start operation switch, and also extracts all output signals such as operation command relay output, external relay output, and LED display. Processing. The CPU 11 is connected to a start / stop circuit 12, an LED display circuit 13, an operation switch input circuit 14, an external signal input circuit 15, an external signal output circuit 16, and the like. This process is performed by software built in the CPU 11.
[0004]
The operation of this control device is as follows as an example. When the contact 21 of the external start signal is closed, this signal is transmitted to the CPU input terminal D / I via the photocoupler 22, and the CPU 11 outputs a pump start signal from the output terminal D / O. A current is supplied from the output circuit D / O to the relay circuit RY1 by the driver 23, and the contact ry1 is closed, whereby the external electromagnetic switch 19 is operated from the terminals B1 and B2, and the pump is supplied with power and the pump is turned on. Start driving. The operation state of the pump is output to the LED display device 13. Further, an operation signal such as an automatic driving test is input to the CPU 11 through the operation switch input circuit 14, and processing corresponding to this is performed. Further, from the external input contact 24, signals such as temperature abnormality and pressure abnormality are input via the external signal input circuit 15, and these signals are input to the CPU 11 via the photocoupler 25, and the CPU 11 performs arithmetic processing. Then, processing such as alarm output or signal output to the monitoring room is performed from the output circuit 16.
[0005]
FIG. 4 shows a configuration example of a power supply circuit used in such a control device. An AC power supply is input to the AC input terminals R and S, the voltage is stepped down by the transformer 26, and a DC low voltage source is formed by the rectifying diode 27 and the smoothing capacitor 28. The DC low voltage source is supplied with + 5V and + 12V voltages as the CPU and output circuit power supply. Then, + 24V is supplied as an input circuit power source to which various sensors and the like are connected. Further, + 24V is supplied as a power source for the start / stop circuit including the relay RY1 and the like. As described above, the various power sources used in the control device generally take a form in which a plurality of DC low voltages are extracted from a single transformer and supplied to various control circuits.
[0006]
[Problems to be solved by the invention]
However, in the configuration of the conventional control device shown in FIG. 3, all the pump start / stop commands are controlled via the CPU as described above. For this reason, if the CPU breaks down or malfunctions such as runaway or abnormal stop, the control function stops, so the pump can be started when water supply such as water supply and fire fighting activities are actually required. The case of disappearing can be considered.
[0007]
In addition, when the power source of the CPU is broken or abnormal, the control function by the CPU is stopped, so that the most important start / stop circuit cannot be controlled. Similarly, when the power supplied to the control circuit that performs start / stop control is not supplied for some reason, there is a problem that the pump cannot be started when necessary.
[0008]
The present invention has been made in view of the above-described problems. Even when an abnormal operation of the CPU occurs or power supply to the CPU is interrupted, the rotating machine is normally started / stopped. It is an object of the present invention to provide an operation control device for a rotating machine that can handle the above.
[0009]
[Means for Solving the Problems]
The present invention relates to an operation control device including starting and stopping of a rotating machine, the control device including a CPU, various control circuits connected to the CPU, and a start / stop circuit for controlling the starting and stopping of the rotating machine. The operation control device for a rotating machine is characterized in that the start / stop circuit is provided independently without going through the CPU. As a result, even if there is an abnormal operation of the CPU, the start / stop circuit is not affected, and the start / stop operation of the rotary machine such as a pump can be performed at a necessary time. Therefore, the reliability of a system using a rotary machine such as a pump / fan can be improved.
[0010]
Further, the start / stop circuit has two contacts simultaneously turned on / off by an external start signal or an operation switch, one of the two contacts gives a start command to the rotating machine, and the other contact is a CPU. it is characterized in that it is intended to transmit a signal to. As a result, the start / stop circuit can perform a control operation of the rotating machine independent of the CPU, and can transmit a signal to the CPU regarding the control operation.
[0011]
In addition, the power supply system of the operation control device includes the CPU, various control circuits connected to the CPU, a first power supply system that supplies direct current power to the start / stop circuit, and a direct current only to the start / stop circuit. and a second power supply system supplying power, is characterized in that the duplicated.
[0012]
Further, the present invention provides an operation control device including starting and stopping of a rotating machine, wherein the control device includes a CPU, various control circuits connected to the CPU, and a start / stop circuit for controlling the starting and stopping of the rotating machine. The start / stop circuit is independently provided without going through the CPU, and the power supply system of the operation control device is connected to the CPU, various control circuits connected to the CPU, and the DC power supply to the start / stop circuit. And a second power supply system that supplies DC power only to the start / stop circuit. The rotary machine operation control apparatus is characterized in that it is duplicated.
Thereby, since the power supply of the important start / stop circuit which performs start / stop operation | movement of a pump etc. is duplicated, the reliability of a system can be made still higher.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a configuration example of a pump operation control apparatus according to an embodiment of the present invention, and FIG. 2 shows a configuration example of a DC power supply circuit supplied to each circuit of the control apparatus. In addition, the same code | symbol in each figure shows the same or an equivalent part.
[0014]
The control device shown in FIG. 1 is an example of a control device used for a pump unit as in the conventional example, and controls the CPU 11 that forms the core of the control device on one printed wiring board and the start / stop of the pump. A start / stop circuit 32, various input circuits 14 and 15, various output circuits 16, an LED display device 13, and the like are mounted. Among these circuits, the start / stop circuit 32 that controls the start / stop of the most important rotating machine is configured not to pass through the CPU 11. In the start / stop circuit 32, the relay RY1 is energized when the contact 21 of the external activation signal is closed, and the latch relay RY2 is set when the switch ry1 is closed. As a result, the contact ry2a is closed, the electromagnetic switch 19 connected to the terminals B1 and B2 is closed, the pump is turned on, and the pump is started.
[0015]
That is, the relay RY2 of the start / stop circuit 32 is directly driven by an external start signal input or a start signal such as the start / stop switch 34, and the two contacts ry2a and ry2b are simultaneously turned on / off. As described above, one contact ry2a of the relay RY2 is output for the external activation signal, and the other contact ry2b is input to the CPU 11 for confirmation of the activation operation. Thereby, CPU11 can perform external signal output operation, such as a display of the driving | running state of a pump, for example.
[0016]
As for the control circuits other than the start / stop control circuit, all input signals, output signals, and display signals such as LEDs are all passed through the control circuit via the CPU, as in the prior art. As a result, even when an emergency abnormal situation such as a CPU runaway or abnormal stop occurs, the start / stop operation of the rotating device, which is the minimum necessary operation, can be performed by the start / stop circuit 32.
[0017]
Further, it is necessary to supply DC power to these various control circuits. In this control device, the DC power supply system is also provided with two types of power supply systems. The control power supply system 1 is a standard power supply system similar to the conventional one that supplies a DC low voltage to the CPU 11, input circuits 14 and 15, output circuit 16, LED display circuit 13, start / stop circuit 32, and the like. The control power supply system 2 is a backup power supply system of the most important start / stop circuit 32 for controlling the operation of the rotating machine.
[0018]
As shown in FIG. 2, the power supply system of both the control power supply system 1 and the control power supply system 2 is connected to the start / stop circuit 32, and DC power is supplied from both. That is, the wiring connection is separated into the power supply system 1 and the power supply system 2 at the AC power supply terminals R and S of the printed wiring board on which the control device is mounted. Then, the voltage is stepped down through the transformers 24 and 30, respectively, and a DC power supply is configured using the rectifying diodes 27 and 31 and the smoothing capacitor 28, and a DC low voltage is supplied to each control circuit. That is, + 5V is supplied to the CPU 11, + 12V is supplied to the output circuit 16, + 24V is supplied to the input circuits 14 and 15, and a voltage of + 24V is supplied to the start / stop circuit 32.
[0019]
As a result, when the control power supply system 1 is broken or abnormal, the CPU 11 does not operate because power is not supplied to the CPU 11. However, if the control power supply system 2 is still alive in such a case, there is no problem in the supply of power to the start / stop circuit 32, and the start / stop operation of the rotating device, which is the minimum operation, is performed. It becomes possible. Even when the control power supply system 2 is faulty or abnormal, if the control power supply system 1 is alive, the normal operation is possible, leading to a reduction in the failure rate of the entire system and reliability. The system can be high.
[0020]
In the above-described embodiment, a step-down power source using a transformer is used. However, for example, a switching power source may be used. The control power supply system 1 may be a step-down method using a transformer, and the control power supply system 2 may be a switching power supply or vice versa.
[0021]
In addition, the above-described embodiments are for the operation control device of the pump unit, but it goes without saying that the gist of the present invention can be applied to operation control devices such as various pumps and fans.
[0022]
【The invention's effect】
As described above, according to the present invention, among the various control circuits constituting the control device, the start / stop circuit of the rotating machine that requires the minimum operation is configured not to go through the CPU. However, the minimum necessary operation of the rotating machine can be ensured. Thereby, the reliability of the system using a rotating machine can be improved. In addition, since the power supply system is duplicated and supplied to both the start and stop circuit from both systems, a more reliable system can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a control device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a configuration of a power supply circuit of the control device in FIG. 1;
FIG. 3 is a diagram illustrating a configuration of a conventional control device.
4 is a diagram illustrating a configuration of a power supply circuit of the control device in FIG. 3;
[Explanation of symbols]
11 CPU
13 LED display device 14 Operation switch signal input circuit 15 External signal input circuit 16 Output circuit 19 Electrode switch 32 Start / stop circuit

Claims (2)

In an operation control device including starting and stopping of a rotating machine, the control device includes a CPU, various control circuits connected to the CPU, and a starting and stopping circuit for controlling starting and stopping of the rotating machine. Provide the circuit independently without going through the CPU ,
A power supply system of the operation control device includes a CPU, various control circuits connected to the CPU, a first power supply system that supplies DC power to the start / stop circuit, and a DC power supply only to the start / stop circuit. An operation control device for a rotating machine, wherein the second power supply system to be supplied is duplicated .   In the start / stop circuit, two contacts are simultaneously turned on / off by an external activation signal or an operation switch, one of the two contacts gives a start command to the rotating machine, and the other contact to the CPU. 2. The operation control device for a rotary machine according to claim 1, wherein the signal is transmitted.

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