JPH01196474A - Refrigeration equipment abnormality display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an abnormality display device for a refrigeration system that displays an abnormal location in a refrigeration system, and particularly relates to an abnormality display device that can identify and display an abnormal location.

(Prior Art) Conventionally, as an abnormality display device for a refrigeration system, an air conditioner is equipped with a temperature display element made of a photoelectric element and an abnormality detector, as disclosed in, for example, Japanese Utility Model Application Publication No. 58-13427. It is known that when there is an abnormality in each part of an air conditioner, the abnormality is detected by an abnormality detector and the temperature display element is blinked to indicate the abnormality of the apparatus.

(Problem to be Solved by the Invention) However, since the above-mentioned conventional device has only one abnormality detection function and one display function,
It is not possible to display which part of the device is abnormal. In addition, although the abnormality detector itself may be malfunctioning, it is impossible to distinguish between such cases and equipment abnormalities, and as a result, it takes time to find the abnormality, and the system in which the refrigeration equipment is installed There was a problem that overall recovery was delayed.

The present invention has been made in view of the above, and its purpose is to provide a means for individually detecting abnormalities in each part of the device with a simple configuration, thereby making it possible to accurately and easily identify abnormalities. The purpose is to do so.

(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention is to utilize a protective switch for protecting equipment arranged in each part of the device.

Specifically, as shown in FIG. 1, a plurality of protective switches (51P) and (51C) are used as abnormality display devices for the refrigeration system, which operate when there is an abnormality in each part of the refrigeration system.

(63H), (49C), and (49F) are connected in parallel to the power supply by bypass lines (B4) to (B8), respectively, and an input circuit (3), and each bypass line of the input circuit (3). (B4) to (B8) A plurality of detection means (PO2) to (PC4) to (
PC8) and the detection means (PO2) to (PC4) to (P
The protection switch (5) is activated based on the on/off signal from the
1P), (51C), (63H).

(49G) and (49F) are activated, and a display means (21) for displaying the abnormal location upon receiving the output of the determining means (8). That is.

In addition, the input circuit (3) includes multiple protective switches (51P)
, (51C), (63H), (49C),
(49F) is connected in series to the power supply, and each protective switch (51P), (51C), (63H),
(49C) and (49F) can also be connected in parallel to the power supply by bypass lines (B4) to (B8).

Further, the determining means (8) detects the detecting means (PO2) to (P
A sampling means (22) that samples the on/off signals of C4) to (PC8) multiple times within a predetermined time, and each protection switch (51P) that receives the output of the sampling means (22) and operates within a predetermined time.

(51C), (63H), (49C), (49F) an integrating means (23) for integrating the number of different OFF signals, and each protection circuit (51P), (5
1C), (63H), (49C), and (49F), it is more effective to configure the search means (24) for searching for the largest integrated value of the different off signals as an abnormal location.

(Function) With the above configuration, in the present invention, when an abnormality occurs in each part of the equipment during operation of the refrigeration equipment, the protective switches (51P) and (51C) are provided for each part of the equipment.

(63H), (49C), and (49F) are opened, and the on/off state of each bypass line (B4) to (B8) of the input circuit (3) changes. This is detected by the detection means (PO2)
(PC4) to (PC8) detect and determine means (8)
The protective switch (5) is activated based on the on/off signal.
1P), (51C), (63H).

(49C) and (49F) are activated, and the display means (21) displays the abnormal locations individually.

In that case, each protective switch (51P), (51C),
(63H), (49C), (49F) are connected in series to the power supply, and each protective switch (51P),
(51C), (63H), (49C).

The rear side to the power supply of (49F) is the bypass line (B4)
~ (B8), when connected in parallel to the power supply, each detection means (PO2) is determined by the determination means (8).
Protection switch (51P), (51C), (63H) from the combination of off signals of ~(PC4) ~(PC8)
, (49C), and (49F) are activated, and the protection of each device can be ensured with a simple configuration using existing equipment.

Furthermore, when the determination means (8) is composed of a sampling means (22), an integrating means (23), and a searching means (24), the maximum abnormality integrated value obtained by sampling multiple times and integrating individually within a predetermined time A protective switch (51P) that shows
(51C), (63H), (49C), (
49F) will be searched as an abnormal location, and the detection means (PO2) ~ (PC4) ~ (PC8
), failure of the signal system, - erroneous detection of abnormalities due to temporary malfunctions, etc. can be effectively prevented.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 2 onwards.

FIG. 2 shows a control device for a temperature controller for adjusting the temperature of cooling oil of a machine tool according to an embodiment of the present invention, (1) is the main body board of the control device, and (2) is the control device for the control device. It is an operation board. In the main body board (1), (4) is a protection circuit section for detecting abnormalities in each part of the refrigeration equipment, and the protection circuit section (4) is connected to the two-phase AC component in the three-phase power supply. There is.

Further, (5) is a control circuit unit that processes the signal of the protection circuit unit (4), and the control circuit unit (5) is connected to the above-mentioned two via the AC-DC conversion power supply circuit (6). It is connected to a DC power source that is converted from a phase AC power source.

The protection circuit section (4) is provided with an input circuit (3) connected to a large number of protection switches that are opened to protect each section of the apparatus when an abnormality occurs. The input circuit (3) includes a normally closed contact of a pump overcurrent protection switch (51P) that opens when an overcurrent flows through the cooling oil circulation pump (not shown), and a compressor of the refrigeration system. A normally closed contact of a compressor overcurrent protection switch (51C) that opens when an overcurrent flows through (not shown), and a high voltage abnormality protection switch that opens when the high pressure of the refrigeration equipment rises excessively. (63H) normally closed contact and compressor overheat protection switch (4) that opens when the compressor overheats.
9C) normally closed contact and a fan overheat protection switch (4C) that opens when the outdoor fan (not shown) of the refrigeration system heats up.
Normally closed contact of 9F) and electromagnetic switch for pump operation (52P)
) and its normally open contacts. Each of the above protective switches (51P), (51C), (63H), (
49C) and (49F) are connected in series to the two-phase AC power supply, and each electromagnetic switch (51P)
, (51C), (δ3H), (49C), and (49F) are connected in parallel to the bypass lines (B4) to (B8), respectively, to the two-phase AC power supply. has been done.

Each of the bypass lines (B4) to (B8) is equipped with a photocoupler (PO2) to (P
C4) to (PC8) are provided. In other words, under normal conditions, all photocouplers (PO2) to (PC4) to (P
C8) is outputting an on signal, but when the protection switch (51P) is opened, all photocouplers (PO
2) ~ (PC4) ~ (PC8) are protective switches (51C
) opens, each photocoupler (PO2) to (PC4) to (PC8) on the rear side of the power supply opens, and when the protective switch (63H) opens, each photocoupler (PC4)
) to (PC8) to (PC4) to (PC8), each photocoupler (PO7) opens when the protective switch (49C) opens.
), (PC4) to (PC8) are the protective switch (49F)
When it opens, the photocabra (PC4) ~ (PC8
) are configured to output an off signal.

In the protection circuit section (4), (11) is a phase sequence detection circuit for checking the wiring of a three-layer AC power supply, (PC
I), (PO2) are photocouplers for wiring check, (SW5) are remote control switches, (PO2) are photocoupler for input confirmation, (5
2Px) is the normally open contact of the electromagnetic switch for pump operation control,
(52C) is the electromagnetic switch for compressor operation, (52Cx) is the normally open contact of the electromagnetic switch for compressor operation control, (52H)
is an electromagnetic switch for an oil heater (not shown), (52H)
x) is a normally open contact of an electromagnetic switch for input control of an oil heater.

Next, in the control circuit section (5), -(8) represents each of the photocouplers (detection means> (PO4) to (PC4).
) to (PC8) as a determining means (8) for determining an abnormal location where a protective switch is operating based on a combination of on/off signals, the CPU (8)
The on/off signals of each of the photocoupler (PCI) to (PC4) to (PC8) are transmitted via the input interface circuit (7), and the outside air is transmitted to the outdoor unit (not shown) of the refrigeration system. A temperature signal from a temperature detection thermistor (ThA) and a temperature signal from an oil temperature detection thermistor (T h O) disposed in a cooling oil tank (not shown) are connected so as to be inputtable. Further, (9) is an output interface circuit, through which a signal from the CPU (8) is transmitted to a drive unit (10) to be described later.
) is input to the operation board (2).

Note that signals other than those mentioned above are connected to the input interface circuit (7). (TPl) is the line test terminal, (vRl) is the ΔT1 set volume, (
VH2) is a volume for setting the oil temperature control target temperature Ts;
(VH2) is the volume for zero point correction, (VH2) is the volume for guard timer set, (SWI) is the switch for switching between tuning and fixed, (SW2) is the switch for selecting defective lance for thermo ON/OFF switching, ((SW3)
) is a ΔT2 changeover switch, and (SW4) is a forced thermo-on operation setting switch.

Further, a drive unit (10) for operating each device is connected to the control circuit unit (5), and in the drive unit (10), (52Px) is the electromagnetic switch for controlling the pump operation. (52Cx) is the coil of the electromagnetic switch for controlling compressor operation, (52Hx) is the coil of the electromagnetic switch for controlling heater input, (Xl) is the coil of the electromagnetic switch for operating status display lamp. , (X2) is a coil of an electromagnetic switch for an abnormality indicator lamp of the device. Furthermore, there is a connection between the base terminal (ZC) provided at the right end of the main board (1) and two terminals (Zl) and (Z2) connected in parallel to the base terminal (ZC). is the normally open contact (X
i), (X2) are interposed, and this contact (ZC),
(Zl) and (Z2) are connected to the operation board (2) side by signal lines.

The operation board (2) is connected to the output interface circuit (9) of the main body board (1) via a connector (CNX), and the operation board (2) has information on how to operate and stop the device. In addition to the command button (BSI), various display lamps (LEDi) to (LHDII) consisting of light emitting diodes that flash at predetermined time intervals are provided. Here, (LEDI) is a power supply input status confirmation lamp, (LED2) is the device operation indicator lamp, (LED3)
is an abnormality indicator lamp of the device, (LED4) is an operation indicator lamp of the compressor, and (LED5) to (LEDLL) are oil temperature indicator lamps that display the temperature in the cooling oil tank at predetermined temperature intervals.

Here, the above indicator lamps (LED5) to (LEDII
) also serves as an abnormality display for each device, and as shown in the table below, the external temperature detection thermistor (T
h A) abnormality (code 2 in the table, represented by C2; the same applies hereinafter), oil temperature detection thermistor (T h O)
abnormality (C3), high oil temperature abnormality of cooling oil (C4), overheating abnormality of fan (C5), overheating abnormality of compressor (C6), overcurrent abnormality of compressor (C7), high pressure abnormality (C8) ) are displayed respectively. Also, the above lamp (LEDIO).

If both (LEDII) light up, there is a pump overcurrent error (C9), and the lamps (LED9) to (LEDII)
If both are lit, Fuodokabura (PC4
) ~ (PC4) ~ (PC8) abnormality (CIO), if none of them lights up, power supply abnormality (CI) (for example, reverse phase,
Phase loss, frequency abnormality) is displayed.

Therefore, each of the above display lamps (LED8) to (LHDII
) constitutes a display means (21) for displaying an abnormal location.

In the above table, the circle mark indicates the indicator lamp (LED5).
) to (LEDII) are shown blinking, and a blank space indicates off.

Next, the method of determining abnormalities by the CPU (8) will be explained based on the chart of FIG. 3. In step S1, each of the photocoupler (PC4) to (PC4) to
(PC8) is sampled, the result is determined in step S2, and all photocoupler (PC4) are sampled.
) to (PC8) are off, it is determined that a pump overcurrent is abnormal and the individual integrating circuit (P4C) is activated in step S3.
Add 1 to . Similarly, Photocabra (PC5) ~ (
If PC4) to (PC8) are off, it is determined that there is an overcurrent abnormality in the compressor, and the process proceeds to step S4.
If ~(PC4) ~(PC8) are off, it is determined that there is a high pressure abnormality, and the process proceeds to step S5.
, If (PC4) to (PC8) are off, it is determined that there is an overheating abnormality in the compressor, and the photocoupler (P
If only C4) to (PC8) are off, it is determined that there is an abnormality in fan overheating, and the process proceeds to step S7, where 1 is added to each of the corresponding individual integration circuits (P5C) to (P8C). Also, which photocabra (PC4) ~ (
If PC4) to PC8 are also on, it is determined that the entire device is in a normal operating state, and the process proceeds to step S8, where 1 is added to the corresponding individual integration circuit (PNC), while any of the above apply. If not, for example, Photocabura (PC
l) is off and other photocabras (PC5) ~ (PC8)
When one of the is on, which is an impossible situation, the photocoupler (PC4) ~ (PC4) ~ (
It is determined that the PC 8) is out of order, and the process proceeds to step S9, where 1 is added to the corresponding individual integration circuit (PAC).

Then, in step S+e, the sampling number accumulation circuit (
PC) and add 1 to the above step S in step S++.
Repeat sampling from 1 to 5ill, wait until the number of repetitions reaches 16, and proceed to step 312.
Each individual circuit (P4
C) After searching for the maximum integrated value among ~(P2O), (PNC), and (PAC) and determining the abnormality or failure location, all integrated values are reset in step S+3 and the abnormality location is determined. Finish the determination. Note that if there are multiple items showing the maximum integrated value, the abnormal location is determined according to a predetermined priority order.

Here, in step S1, the detection means (PC4)
Sampling means (22) for sampling the on/off signals of ~(PC4) ~(PC8) multiple times within a predetermined time
is configured, and in steps 83 to S7, each protective switch (51P), (51C), (63H),
(49C), (49F) Integrating means (23) for integrating the number of different OFF signals is configured. Further, in step S12, each protection circuit (51P), (51C), (63H), (49C),
(49F) A search means (24) is configured to search for the maximum value among the integrated values of other OFF signals as an abnormal location.

After determining the above-mentioned abnormality location, as shown in the table above, each of the above-mentioned abnormality display lamps (LE
The abnormal state is displayed on D5) to (LEDII).

Furthermore, when an abnormality is detected as described above, the following switch control is performed until the next reset. That is,
When power supply abnormality (CI), high oil temperature abnormality (C2), and pump overcurrent abnormality (C9) in the table above are detected, the electromagnetic switch for pump operation control (52Px) is forcibly turned off, and each abnormality (cl) to When any of (C9) is detected, the electromagnetic switch for compressor operation control (52Cx), the electromagnetic switch for heater input control (52Hx), and the electromagnetic switch for operating status display lamp (Xl) are all forced off. . Moreover, when any one of the abnormalities (C1) to (C10) is detected, the electromagnetic switch (X2) for the abnormality display lamp is turned on at the same time.

Therefore, in the above embodiment, photocouplers (PC4) to (PC4) to (PC8) as detection means are arranged in the input circuit (3), and the protective switch (51) of the input circuit (3) is
P), (51C), (63H), (49C), (
Since the abnormality location is determined based on the on/off state of 49F), the abnormality location of the device can be identified and detected. Then, since the abnormal locations of the device are individually displayed on the display means (21) from the signal, there is no need to take the time and effort to find the abnormal locations unlike in the past.
It is possible to take measures to quickly restore the system. Also, the existing protective switches (51P) and (51C).

(63H), (49C), and (49F), it has the advantage that the mechanism for abnormality detection is simple.

In particular, in the above embodiment, when determining an abnormal location, the sampling means (22) is used for each photocoupler (PC4) to (
Pct! The on/off state of I) is sampled multiple times within a predetermined time, and the integrating means (23) individually integrates the number of abnormal states of each part of the refrigeration equipment for each sampling, and then the retrieving means (24) Each photocabra (PC
4) Since the integrated values of abnormal conditions of ~(PC4)~(PC8) are compared and the location showing the maximum integrated value is detected as an abnormal location, each photocoupler (PC4)~
(PC4) to (PC8), it is possible to effectively prevent false detection of an abnormal location due to temporary malfunction of a signal system or the like. Furthermore, by making such a comprehensive judgment, each photocabra (
This is extremely effective in being able to detect failures in the PC4) to PC4 to PC8 themselves.

In addition, in the said Example, each protection switch (51P), (51C), (63H) of an input circuit (3).

(49C) and (49F) were connected in series, but they were connected in parallel to the power supply by bypass wires (B4) to (B8), and the photocoupler (PC4) to (PC4)
~ (PC8) etc., each bypass line (B4
) to (B8) may be detected.

Furthermore, in the above embodiment, an example in which the present invention is applied to a temperature controller for a machine tool has been described, but the present invention is not limited to the above embodiment, and can be applied to other devices such as indoor air-conditioning equipment, container refrigeration equipment, etc. Needless to say, the present invention can also be applied to other refrigeration equipment.

(Effects of the Invention) As explained above, according to the abnormality display device for a refrigeration equipment of the present invention, a bypass line is provided in the input circuit for protecting equipment in each part of the equipment, and the on/off status of each bypass line is Since abnormalities in each part are detected individually and the abnormality location of the device is displayed based on the detection signal, the accuracy of abnormality display can be improved and actions taken against abnormalities can be speeded up with a simple configuration. can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention. FIG. 2 and subsequent figures show an embodiment of the present invention, FIG. 2 is an electric circuit diagram thereof, and FIG. 3 is a chart showing a method for determining an abnormal location. (3)...Input circuit, (8)...CPU (discrimination means), (21)...Display means, (22)...Sampling means, (23)...Integration means, (24)... )...
Search means, (51P)... Pump overcurrent protection switch,
(51C)...Compressor overcurrent protection switch, (63H)
... High pressure abnormality protection switch, (49C) ... Compressor overheat protection switch, (49F) ... Fan overheat protection switch, (PC4) ~ (PC4) ~ (PC8) ... Photocoupler (detection means), (21)...display means.

Claims (3)

[Claims] (1) Multiple protective switches (51P), (51C), (63H), (49C) that operate when there is an abnormality in each part of the refrigeration equipment.
(49F) to the power supply, bypass wires (B4) to (
A plurality of detection means (PC4) for detecting the on/off state of energization of each bypass line (B4) to (B8) of the input circuit (3) and the input circuit (3) connected in parallel by the input circuit (PC4)
) ~ (PC8) and the detection means (PC4) ~ (PC8)
Protection switch (51P) based on on/off signals from
, (51C), (63H), (49C), and (49F) are operating, and a discriminating means (8) for discriminating the abnormal location where the discriminating means (8) receives the output and displays the abnormal location. An abnormality display device for a refrigeration system, comprising: display means (21). (2) Input circuit (3) includes multiple protective switches (51P)
, (51C), (63H), (49C), and (49F) are connected in series to the power supply, and each protective switch (51
P), (51C), (63H), (49C), (49F
) to the rear side of the power supply by bypass wires (B4) to (B8
2. The abnormality display device for a refrigeration system according to claim 1, wherein the abnormality display device is connected in parallel to a power source. (3) The determining means (8) includes the detecting means (PC4) to (PC
8) sampling means (22) for sampling the on/off signal multiple times within a predetermined time; and each protective switch (51P), (51C), (63H), (49C)
, (49F) Integrating means for integrating the number of times of another OFF signal (
23), and each protection circuit (51P), (51C), (63H), (49C), (
49F) The abnormality display device for a refrigeration system according to claim 1, further comprising: a search means (24) for searching for the largest integrated value of the different off signals as an abnormality location.