JP2002333183A - Freezer and method of writing data in freezer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the processes of a user writing the reference values of parameters pertaining to operation control to the EEPROM (12) of a control board (1) separately for each mounting model, in the manufacturing process of a freezer. SOLUTION: A program for automatically writing a specified reference value geared to a mounting model into the EEPROM (12) is built in the CPU (11) of the control board (1). When the power is turned on, the program is executed only once.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a refrigerating apparatus and a data writing method for the refrigerating apparatus.

[0002]

2. Description of the Related Art Conventionally, a common control board has been used for a plurality of types of refrigerating apparatuses, for example, by mounting the same type of control board on a plurality of types of air conditioners having different capacities.

[0003] Such a control board includes a main control unit for executing operation control and a storage unit for storing reference values of parameters used for operation control (for example, refrigerant evaporation temperature during cooling operation). ing. Normally, the reference value is set for each type of refrigeration system. By the way, some of the reference values should be changed by a serviceman or a user according to the situation of the installation site of the refrigeration system. Therefore, rewritable storage means (for example, EEPROM) is used for the storage unit so that the setting of the reference value can be changed at the installation site.

In order to use a common control board, it is not possible to store the reference value in the storage section in advance when manufacturing the control board. This is because, at the time of manufacturing the control board, it is unknown which type of refrigeration apparatus is to be mounted on the control board. Therefore, a step of writing the reference value in the storage unit is required in a refrigeration apparatus manufacturing line.

[0005]

Conventionally, data has been written into the storage section manually. That is, in the manufacturing line, it is essential that a worker identifies a model on which the control board is mounted and then writes the respective reference values corresponding to the mounted model into the storage unit.

However, in order to simplify the manufacturing process, it is preferable to reduce the above steps. Further, in order to prevent manual input errors, it is desirable to automate the writing of the reference value. The present invention has been made in view of such a point, and an object of the present invention is to reduce the above steps in a manufacturing process of a refrigeration apparatus.

[0007]

A refrigerating apparatus according to the present invention comprises a main control unit for executing operation control, and rewritable storage means for storing a reference value of a predetermined parameter used for the operation control. A control board having a first storage unit, a second storage unit that stores a program for writing a reference value preset according to the type of the refrigeration device into the first storage unit, An input unit for changing a setting, wherein the control board determines whether or not a reference value has already been written in the first storage unit when the power is turned on. When the reference value is not written, the program is not executed, and when the reference value is not written, the program is executed to write the reference value.

The data writing method according to the present invention comprises a main control unit for executing operation control, a first storage unit for storing a reference value of a predetermined parameter used for the operation control, comprising a rewritable storage unit. A control board having a second storage unit storing a program for writing a reference value previously set according to the type of the refrigeration apparatus into the first storage unit; and a control unit for setting and changing the reference value. A data writing method for a refrigerating apparatus, comprising: input means for determining whether or not a reference value has already been written to the first storage unit when the power is turned on. Is executed, while the reference value is not written, the program is executed to write the reference value.

According to the present invention, when the power is turned on, it is determined whether or not a reference value is written in the first storage unit. If the reference value is not written, a predetermined reference value according to the mounted model is automatically set by the program. Is written to. on the other hand,
When the reference value is written in the first storage unit, the program is not executed, and the reference value is not overwritten.

[0010]

According to the present invention, since the power has not yet been turned on to an unused control board, the reference value according to the mounted model has not been written. Can be commonly used for a plurality of types of refrigerating apparatuses. On the other hand, when the power is turned on for the first time, the reference value corresponding to the mounted model is automatically written by the writing program, so that the writing work of the operator can be reduced and the manufacturing process can be simplified. In addition, it is possible to prevent manual input errors.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

The refrigeration apparatus according to this embodiment is a so-called multi-air conditioner for buildings (20), and as shown in FIG. 1, an outdoor unit (21) and a plurality of indoor units (22, 22,...) Are connected. It is configured.

The outdoor unit (21) is provided with a compressor (24), a four-way switching valve (25), an outdoor heat exchanger (26), and an electronic expansion valve (27). In addition, outdoor unit (21)
Is provided with a control board (1) composed of a printed board. Each indoor unit (22) has an electronic expansion valve (29)
And an indoor heat exchanger (28).

The control board (1) is a control board that can be used for a plurality of types of refrigeration systems. As shown in FIG.
The control board (1) includes a CPU (11) for executing operation control of the multi-air conditioner (20), and an EEPROM (12) for storing reference values of predetermined parameters used for operation control.
And a data input unit (13) for receiving various data of the multi air conditioner (20) (for example, operating frequency of the compressor (24), evaporating temperature of the refrigerant, condensing temperature of the refrigerant, etc.), and the compressor (24)
(14) that outputs a control signal to an electronic expansion valve (27, 29), etc., an input switch (15), and a display (16)
Are provided. The CPU (11) includes a storage unit (17) that stores a program for writing a reference value described later.

The parameters used for the operation control include, for example, a target capacity value during the cooling operation, a target capacity value during the heating operation, the evaporation temperature of the refrigerant, the condensation temperature of the refrigerant, the high pressure side pressure of the refrigerant, and the low pressure side of the refrigerant. The pressure, the operating frequency of the compressor (24), the opening degree of the electronic expansion valves (27, 29), the temperature of the outdoor heat exchanger (26) as a reference for starting the defrosting operation, the defrosting operation time, etc. One or more parameters can be used.

The reference value stored in the EEPROM (12) is a predetermined value set according to the type of the multi air conditioner (20). Although the details will be described later, the EEPR
The reference value stored in the OM (12) is a value that can be changed at the installation site. Changing the setting of the reference value is performed by operating the input switch (15) of the control board (1) while looking at the reference value number displayed on the display section (16). For example, when the multi-air conditioner (20) is installed in an environment with a large load, the target capacity value should be increased for the large load. In such a case, the serviceman or the user operates the input switch (15) to change the reference value of the target ability value to a larger value.

Next, data writing to the control board (1) will be described. The control board (1) is used in common for a plurality of types of refrigerating apparatuses. In an initial stage before the control board (1) is mounted on the outdoor unit (21), the EEPROM (12) has No specific reference value has been entered for the model. In this state where the reference value is not stored, “0” is input to the flag F for determining whether the reference value is written. On the other hand, the storage unit (17) of the CPU (11) has an EEPROM
For (12), a program (reference value writing program) for writing a predetermined reference value according to the mounted model is stored.

In the refrigeration system manufacturing line, the same type of control board (1) is mounted on a plurality of types of refrigeration systems (specifically, the outdoor unit (21)) without distinction. Then, after mounting the control board (1), the power is turned on.
Then, the CPU (11) of the control board (1) executes the EEPRO
It is determined whether or not a reference value has already been written to M (12). When the reference value has been written, the program is not executed. On the other hand, when the reference value has not been written, the program is executed.

Specifically, as shown in FIG. 3, when the power is turned on, first, in step ST1, EEPRO
Whether a reference value is written in M (12) (that is,
Flag F = 1 or not). Since the reference value has not been written in the initial stage, the determination result is NO. Therefore, the CPU (11) executes the above-described reference value writing program, and writes a predetermined reference value according to the mounted model into the EEPROM (12) (step ST2). When the writing of the reference value is completed, step ST3
To input the flag F = 1.

Note that once the reference value has been written to the EEPROM (12), the flag F becomes 1, so if the power is turned on thereafter, the result of the determination in step ST1 becomes YES, and the reference value becomes It will not be overwritten. However, as described above, it is possible to manually change the setting of the reference value. That is, in the present embodiment, the automatic writing of the reference value to the EEPROM (12) is performed only once.

As described above, according to the present embodiment, it is not necessary for an operator to identify a mounted model in a manufacturing line and write a reference value corresponding to the mounted model. Therefore, the manufacturing process is simplified because the reference value writing process is reduced. Further, the writing of the reference value is automatically executed by the writing program, so that the writing error by the operator is reliably prevented.

The refrigeration system on which the control board (1) is mounted is an outdoor unit (21) of a multi air conditioner (20).
The air conditioner is not limited to this, and may be another air conditioner, a refrigerator, a freezer, or the like.

The rewritable storage means for storing the reference value is not limited to the EEPROM (12), and another storage device can be used.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a multi air conditioner.

FIG. 2 is a configuration diagram of a main part of a control board.

FIG. 3 is a flowchart of a data writing method.

[Explanation of symbols]

 (1) Control board (11) CPU (main control unit) (12) EEPROM (first storage unit) (13) Data input unit (14) Output unit (15) Input switch (input means) (16) Display unit ( 17) Storage unit (second storage unit) (20) Multi air conditioner (refrigerator) (21) Outdoor unit (22) Indoor unit (24) Compressor (26) Outdoor heat exchanger (28) Indoor heat exchanger

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L060 AA04 AA08 CC10 CC19 EE00 3L061 BA07 3L092 AA14 DA06 EA00 FA00

Claims (2)

[Claims] A main controller (11) for performing operation control;
A first storage unit (12) comprising rewritable storage means for storing a reference value of a predetermined parameter used for the operation control, and a first storage unit for storing a reference value preset according to a model of the refrigeration system; A refrigeration system comprising: a control board (1) having a second storage section (17) storing a program to be written into the section (12); and input means (15) for changing the setting of the reference value. The control board (1), when the power is turned on, determines whether or not a reference value has already been written to the first storage unit (12), and when the reference value has been written, The refrigerating apparatus is configured to execute the program when the reference value is not written while not executing the program, and to write the reference value when the reference value is not written. 2. A main control unit (11) for performing operation control;
A first storage unit (12) comprising rewritable storage means for storing a reference value of a predetermined parameter used for the operation control, and a first storage unit for storing a reference value preset according to a model of the refrigeration system; A refrigeration system comprising: a control board (1) having a second storage section (17) storing a program to be written into the section (12); and input means (15) for changing the setting of the reference value. A data writing method for a device, comprising: determining whether or not a reference value has already been written to the first storage unit (12) at the time of power-on, and not executing the program when the reference value has been written. And writing the reference value by executing the program when the reference value has not been written.