KR100432195B1 - Apparatus for controlling a fan filter unit - Google Patents

Abstract

The present invention relates to a control device of a fan filter unit, comprising: a motor for driving a fan filter unit and a control device for a fan filter unit including a sensing unit for detecting whether the motor is overheated, wherein the control device includes at least two control devices. A drive selection unit including the above fan filter unit control unit, wherein each of the fan filter unit control units selects a drive strength of the motor; An integrating circuit unit for charging and discharging an operating voltage according to a sensing signal of the sensing unit; A switching unit which switches according to charging and discharging of the integrated circuit unit; A light emitting unit that warns overheating of the motor according to switching of the switching unit; A latch unit which is turned on / off according to the switching of the switching unit, maintains an overheat alarm output signal by feeding an output signal to the transistor output terminal when an overheat is sensed, and outputs a signal for blocking driving of the motor; An output unit configured to output an overheat alarm output signal to the latch unit; And a motor driving blocking unit which blocks the driving of the motor according to the output signal of the latch unit.

Description

Fan filter unit controller {Apparatus for controlling a fan filter unit}

The present invention relates to a control device of a fan filter unit, and more particularly, to a control device that can easily control fan filters for purifying air in a clean room installed in a small area, and thereby reduce the installation cost of the control device. will be.

In general, a fan filter unit is a device used to maintain the internal air in a clean state at a predetermined level or higher, such as a clean-room in which semiconductors are manufactured. Such a control system of the fan filter unit is a system for performing on / off control of the fan filter unit, three speed control (high speed, normal, low speed), abnormal state monitoring during operation, and power supply.

The control system of the conventional fan filter unit is classified into four types. That is, it is classified into individual control method, group control method, central control method, and individual common line method.

The individual control method is a method of individually controlling and monitoring the on / off and operating states of the plurality of fan filter units using one central processing unit, and the group control method is a plurality of fan filters using one central processing unit. By controlling the on / off of the unit by group and individually monitoring the operating state of the fan filter unit, in the individual control method and the group control method, the motor of the fan filter unit is controlled through the relay unit under the control of the central processing unit. Under 3 speed control (high speed, normal, low speed).

The central control method is controlled by a parallel processing method using a data processing unit (RCU, MCU) serving as a relay between a central processing unit (HPC) and a fan filter unit controlled therefrom. HPC) connects 10 RCUs, 20 MCUs per RCU, and 64 local control units (LCU). At this time, 12,800 fan filter units can be connected to one central processing unit (HPC), and RS-485 is used as a communication method between the central processing unit and the data processing unit, and the data processing unit and the fan filter unit. The individual common line system is a system in which a switching control unit is added to a central processing unit, and 12,800 local control units (LCUs) can be connected to each of the plurality of central control units connected to the central processing unit.

However, the control system of the conventional fan filter unit has a problem in construction because the number of wiring increases because the control line is directly wired from the central processing unit to the relay unit of the fan filter unit.

The control system of another conventional fan filter unit improves this problem, and there is a Korean Patent Registration No. 0135649 filed and co-invented by the same inventor prior to this application. This technology includes a plurality of relay communication units 20 in data communication with one main computer 10, multiple control units 30 connected to each relay communication unit 20, and a plurality of relay communication units 30 connected to each fan. The local control unit 40 is configured to monitor and control the filter unit 50 one-to-one. The operation control of the fan filter unit and the monitoring of the operation state can be performed individually or in groups, and the upper and lower relays of the serial communication can be paralleled. By shortening the wiring, construction time can be shortened and control efficiency can be improved.

However, this type of fan filter unit control system is advantageous for controlling a large number of fan filter units installed in clean rooms of large-scale workplaces. It is smaller than that, and there is a problem in that it is difficult for the general public to manage the installation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a fan filter unit control device that can easily control a plurality of fan filter units installed in a small business at low cost.

Another object of the present invention is to provide a fan filter unit control device that is simple to maintain and install.

1 is a block diagram schematically showing the configuration of a conventional fan filter unit controller.

Figure 2 is a block diagram schematically showing the configuration of a fan filter unit control apparatus according to an embodiment of the present invention.

3 is a circuit diagram for explaining the operation of the fan filter unit control device shown in FIG.

<Description of the symbols for the main parts of the drawings>

100: drive selection unit 200: motor

300: detection unit 400: integral circuit unit

500: switching unit 600: light emitting unit

700: latch portion 800: output portion

900: motor drive cutout

In the fan filter unit control apparatus according to an aspect of the present invention for achieving the above object includes a motor for driving the fan filter unit, and a sensing unit for detecting whether the motor is overheated, The control device includes at least two fan filter unit controllers, each of the fan filter unit controllers comprising: a drive selector for selecting a drive strength of the motor; An integrating circuit unit for charging and discharging an operating voltage according to a sensing signal of the sensing unit; A switching unit which switches according to charging and discharging of the integrated circuit unit; A light emitting unit that warns overheating of the motor according to switching of the switching unit; A latch unit which is turned on / off according to the switching of the switching unit, maintains an overheat alarm output signal by feeding an output signal to the transistor output terminal when an overheat is sensed, and outputs a signal for blocking driving of the motor; An output unit configured to output an overheat alarm output signal to the latch unit; And a motor driving blocking unit which blocks the driving of the motor according to the output signal of the latch unit.

According to this aspect of the present invention, the fan filter unit control apparatus according to the present invention includes at least two or more fan filter unit controllers, each of which controls a plurality of fan filter units. In particular, the fan filter unit controller according to the present invention can be used in a small clean room, for example, a small room or a sterile room of a university laboratory or a hospital, and controls a plurality of fan filter units using a general programmable logic controller (PLC). The installation cost can be reduced as compared to the conventional control system.

In addition, since it is possible to control a plurality of fan filter units through a single terminal, that is, a programmable logic controller, as in the related art, the same effect as in the conventional art can be obtained, and an upgrade of a program required for control is easy compared to a conventional control system. There is this.

According to a further aspect of the invention, the fan filter unit control apparatus according to the invention is characterized in that it further comprises a reset switch in which the latch portion is located on the feedback path and resets the latch portion.

Accordingly, the fan filter unit control apparatus according to the present invention has an advantage of facilitating maintenance.

These and further aspects of the present invention will become more apparent through the preferred embodiments described below with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

2 schematically illustrates a configuration of a fan filter unit control apparatus according to an embodiment of the present invention. As shown, the fan filter unit controller according to the present invention includes at least two fan filter unit controllers, each of which includes a drive selector 100 and an integrated circuit unit 400 for adjusting and selecting the drive strength of the motor. And, the light emitting unit 600 and the latch unit 700 and the output unit 800 receives a signal from the latch unit 700 and the switching unit 500 and the switching unit 500 and the switching operation of the switching unit 500 and The motor driving block 900 is included. And although not shown, a power supply.

In the present invention, the fan filter unit includes a motor and a sensing unit. The motor 200 drives the corresponding fan filter unit according to the signal input from the drive selector 100. As the fan filter unit motor, an AC condenser induction motor is generally used. Therefore, detailed description thereof will be omitted. In the present invention, each of the motors are connected to a common power line, and the motor driving is cut off according to a signal of the motor driving blocking unit described later.

The detector 300 detects overheating according to the driving of the motor 200. That is, the sensor 300 notifies the administrator of the current state of the motor when the motor is overheated and outputs an overheat detection signal to block driving of the overheated motor. In the present invention, when the motor is overheated, an overheat detection signal is output through a cross contact between the two contacts.

The drive selector 100 selects a drive speed (high speed, normal, low speed) of the motor driving the fan filter unit. In the embodiment of the present invention, a hub for manually controlling the drive speed of the motor is used. This will select the drive speed manually in the field.

As shown in FIG. 3, the integrating circuit unit 400 includes a relay L1 for switching a contact switch for controlling an operating voltage input from the outside according to the detection signal from the sensing unit 300 and one of the relays. A resistor R1 connected to the contact a2 and one end thereof are connected to the resistor R1, and the other end is formed of a capacitor C1 grounded to ground. The integrated circuit unit 400 configured as described above charges and discharges an operating voltage applied from the outside according to a sensing signal of the sensing unit 300, that is, a voltage level input from the sensing unit. Due to the delay of the charge time and the discharge time through the integration circuit unit, the feedback path of the latch unit to be described later can be maintained.

The switching unit 500 is composed of a transistor Q1 and switches and outputs an operating voltage applied from the outside according to the charging voltage applied from the integrating circuit unit 400. One end of the light emitting unit 600 is connected to the output terminal of the switching unit 500, and the other end is grounded to ground, and driven by an operating voltage applied through switching of the switching unit 500 to prevent overheating of the motor. Mark as external.

The latch unit 700 includes a relay L2 for switching contact switches b and c intermittently coupled in pairs according to an input voltage applied through the switching unit 500. That is, the latch unit 700 configured as described above is operated on / off according to the switching of the switching unit 500, and maintains an overheat alarm output signal by feeding back an output signal to the output terminal of the transistor Q1 when an overheat is sensed. Outputs a signal to block the motor drive.

In addition, according to an additional aspect of the present invention, the latch unit 700 further includes a reset switch SW1 positioned on the feedback path to reset the latch unit. By doing so, the manager may overheat the motor according to the driving. It is possible to easily operate the re-drive.

The output unit 800 outputs an overheat alarm output signal of the latch unit 700 to an external, that is, programmable logic controller (PLC) circuit of the contact switch (c) driven by the relay (L2) of the latch unit. One contact point c1 is connected to the PLC. Therefore, when the motor driving the fan filter unit is overheated, the control unit transmits an overheat alarm output signal to the PLC so that the administrator can easily view the fan filter units installed in the clean room by viewing the display operating according to the signal input to the PLC. Can be controlled. In addition, by using the PLC as described above, the installation cost is low and the number of wires drawn from each fan filter unit at the time of construction is reduced, thereby simplifying the construction and upgrading the PLC.

On the other hand, the motor driving blocking unit 900 is connected to the latch unit 700 and the photo coupler (U1) is composed of a triac (Triac) for driving in accordance with the gate output voltage of the photo coupler (U1), the tri One end of the evil is connected to the common power line of the motor and one end is connected to the power of the motor. According to such a configuration, the driving of the motor is blocked according to the output signal output from the latch unit.

As described above, the fan filter unit control apparatus according to the present invention controls motors driving the respective fan filter units, and it is possible to check whether there is an abnormality of motors through a general PLC, and includes an overheated motor when an abnormality is detected. The control unit can cut off the motor driving power to prevent overheating.

Hereinafter, an operation of one of the plurality of controllers of the fan filter unit controller according to the present invention will be described with reference to FIG. 3. Although not shown in FIG. 3, the power switch is turned on by the user's operation, and the motor is driven according to the selection of the drive selection unit, that is, the rotational speed of the motor for controlling the driving speed (high speed, normal, low speed) of the fan filter unit. do. As the motor is driven as described above, overheating is sensed through the detection unit connected to the motor, and the detection signal is output.

The output signal is input to the B and D stages as shown in FIG. In Fig. 3, the A and C stages are input terminals of the operating voltage (12V) of the DC component in which the commercial voltage of the AC component input from the outside is converted through the transformer.

When the driving of the motor is normal, the voltage input from the sensing unit to the B stage is a high level value. At this time, the relay L1 of the integrating circuit unit 400 is driven and the contact switch a is connected to a1. . At this time, the operating voltage input to the A stage bypasses the operating voltage input through the b-contact switch of the latch unit 700 to the motor driving blocking unit 900 through the photocoupler U1. Output the operating voltage. As such, the operating voltage input through the photocoupler U1 is input to the gate of the triac Q2 to operate the motor. Meanwhile, the overheat alarm signal output from the latch unit 700 to the output unit 800 is input to the PLC as a high level value. That is, the fan filter unit control apparatus according to the present invention does not operate when a high level signal is input, but is driven when a low level is input.

However, when the overheat detection signal corresponding to the motor overheat is input to the B stage from the sensing unit, that is, when a low level signal is input, the relay L1 of the integrating circuit unit 400 is turned off and the contact switch a is connected to a1. switch to a2. The operating voltage first branched in the operating voltage path through a2 is charged through the resistor R1 and the capacitor C1 of the integrating circuit unit 400. The charging voltage charged in this way is input to the base of the transistor Q1, which is the switching unit 500, and according to this voltage, the operating voltage inputted to the collector of the transistor after being branched second in the operating voltage path is already turned on. Output through the

The operating voltage output in this way drives the light emitting unit 600 to warn the motor of overheating and drives the relay L2 constituting the latch unit 700. As the relay L2 is operated in this way, the contact switches b and c are simultaneously switched from b1 to b2 and from c1 to c2. Accordingly, in normal operation, the operating voltage bypassed through b1 feeds back to the emitter, which is an output terminal of transistor Q1, through b2 to apply the operating voltage to relay L2 and maintains the overheat alarm output signal. As the operation voltage is fed back in the latch unit 700, the triac Q2 also acts as the photo coupler U1 connecting the latch unit 700 and the motor driving block unit 900 does not operate. It does not work and accordingly cuts off the driving of the motor by cutting off the common power line of each motor.

According to an additional aspect of the present invention, the lighting unit 600 is turned on and the motor is normally driven through the reset switch SW1 for resetting the feedback of the latch unit installed in the feedback path. In other words, when the reset switch SW1 is operated, an operating voltage is not applied to the relay L2. Accordingly, the contact switch b is switched from b2 to b1 to bypass the operating voltage flowing along the operating voltage path. do.

The controller operating according to this operation outputs an overheat indication through the PLC when at least one of the signals input to the PLC through the respective output unit is input, and thus the corresponding fan filter through the light-emitting unit lit in the field. Check the drive motor.

As described above, the fan filter unit control device according to the present invention uses a programmable logic controller using a simple contact circuit instead of a microcomputer-based local control unit (LCU), so that the control device can be easily upgraded and installed. There is a merit that it is easy and thus maintenance is easy.

In addition, since multiple fan filter units can be connected to one terminal, installation cost of the fan filter unit control unit of a small clean room such as a small and medium-sized business or a university laboratory can be reduced, and work efficiency can be reduced. Can improve.

While the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many various obvious modifications are possible without departing from the scope of the invention from this description. Therefore, the scope of the invention should be construed by the claims described to include many such variations.

Claims (3)

In the control device of the fan filter unit including a motor for driving a fan filter unit, and a sensing unit for detecting whether the motor is overheated, The control device includes at least two fan filter unit controls, each of the fan filter unit controls being: A drive selector which selects a drive strength of the motor; An integrating circuit unit for charging and discharging an operating voltage according to a sensing signal of the sensing unit; A switching unit which switches according to charging and discharging of the integrated circuit unit; A light emitting unit that warns overheating of the motor according to switching of the switching unit; A latch unit which is turned on / off according to the switching of the switching unit, maintains an overheat alarm output signal by feeding an output signal to the transistor output terminal when an overheat is sensed, and outputs a signal for blocking driving of the motor; An output unit configured to output an overheat alarm output signal to the latch unit; A motor driving blocking unit which blocks driving of the motor according to the output signal of the latch unit; Fan filter unit control device comprising a. The method of claim 1, And the latch unit and the motor driving cut-off unit transmit a signal through a photocoupler. The method of claim 1 or 2, wherein the latch unit: And a reset switch located on the feedback path to reset the latch unit.