JPH0418217B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a separate indoor/outdoor air conditioner in which an indoor unit and an outdoor unit are connected by a power supply cable and a detection signal transmission cable.

[Prior Art] A conventional indoor/outdoor separation type air conditioner was constructed as shown in FIG. Figure 2 is a block diagram showing the electrical wiring of a conventional indoor/outdoor air conditioner. In the figure, 1 is an indoor unit, 2 is an outdoor unit, 3 is an AC power terminal, 4 is an indoor fan, 5 is a transformer, 6 is a DC control power supply circuit, 6a and 6b are its control power supply lines, 7
1 is a controller such as a microcomputer, 8 is a compressor motor, 9 is an outdoor fan, 10 is an outdoor temperature sensor, 11a and 11b are power supply cables, 12
a, 12b are detection signal transmission cables, 13a, 1
3b is the indoor unit power supply cable connection terminal, 14
a and 14b are outdoor unit power supply cable connection terminals,
15a, 15b are indoor unit detection signal transmission cable connection terminals, 16a, 16b are outdoor unit detection signal transmission cable connection terminals, 17 is an outdoor unit power supply switch, 18 is a detection signal amplification circuit, 19a, 19b,
19c is a detection signal input resistor.

In the above configuration, the indoor fan 4 of the indoor unit 1
Electric power is supplied directly from the AC power source 3 to power loads such as the compressor motor 8 of the outdoor unit 2 and the outdoor fan 9 from the indoor unit 1 via the switch 17 and power cables 11a and 11b. On the other hand, a controller 7 such as a microcomputer is supplied with DC voltage from an AC power supply 3 via a transformer 5 and a DC control power supply circuit 6 . Then temperature sensor 1 of outdoor unit 2
The detection element such as 0 is connected to the detection signal transmission cable 12a,
12b, the detection signal amplification circuit 1 of the indoor unit 1
The temperature sensor 10 is connected to the input resistors 19a, 19b, 19c of 8, and a change in the temperature of the outdoor unit 2 causes a change in the impedance of the temperature sensor 10, which is connected to the input resistors 19a, 19c.
The signal is linearized at 9b and 19c, amplified by an amplifier circuit 18, and inputted to a controller 7, where it is A/D converted and the outdoor temperature is detected.

That is, the compressor motor 8 of the outdoor unit 2, the outdoor fan 9
Power for power loads such as the indoor unit 1 and control power for sensing elements such as the temperature sensor 10 are all supplied from the indoor unit 1 via cables 11a, 11b, 12a, and 12b.

[Problems to be Solved by the Invention] Since the conventional indoor/outdoor separate type air conditioner is configured as described above, when installing the air conditioner, the power supply cables 11a, 11b and the detection signal transmission cables 12a, 12b are connected to each other. Care must be taken not to connect them by mistake. This is because if the connection is made incorrectly, the compressor motor 8 of the outdoor unit 2 may not operate or the detection elements such as the temperature sensor 10 may be destroyed. Therefore, conventionally the power supply cable 1
1a, 11b and detection signal transmission cables 12a, 1
By changing the thickness of 2b and changing the color, both cables were made different to prevent incorrect wiring. Therefore, two types of installation cables had to be prepared, resulting in an increase in installation costs.

This invention was made to eliminate the above-mentioned drawbacks, and provides a separate indoor/outdoor air conditioner that makes it possible to detect cable miswiring and reliably prevent miswiring just by preparing one type of cable. The purpose is to provide.

[Means for solving the problem] The indoor/outdoor separated air conditioner according to the present invention has the following features:
The input voltage from the detection signal amplification circuit to the controller, which amplifies the voltage between the connection terminals, determines whether the load connected between the detection signal transmission cable connection terminals of the indoor unit is a power load or the detection element of the outdoor unit is a power load. The size of
The controller detects whether the detection range is within a predetermined detection range or outside the detection range, and the detection result is displayed on a display.

[Function] Utilizing the difference in impedance between the outdoor unit's sensing element and the power load, different voltages are input to the controller when the sensor is connected to the detection signal transmission cable and when the power load is connected. . Miswiring can therefore be detected by indicating on the display when the power load is incorrectly connected by the controller. After confirming that there is no incorrect wiring, close the outdoor unit power-on switch, supply power to the outdoor unit, and begin normal operation.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention, in which 1 to 19c indicate the same parts as the same reference numerals in FIG. A load consisting of an input voltage detection means 21 for detecting the input voltage from 18 and a predetermined voltage range/inside/outside detection means 22 for detecting whether the voltage detected by this means 21 is within or outside the predetermined voltage range. difference detection means, 24 is a light emitting diode 25;
This is an indicator consisting of a current limiting resistor 26. Note that the indoor fan 4, transformer 5, DC control power supply circuit 6, compressor motor 8, and outdoor fan 9 are completely the same as those shown in FIG. 2, so illustration thereof is omitted.

Next, the subsequent wiring detection operation will be explained. The cables 12a and 12b that are now connected to the indoor unit connection terminals 15a and 15b are connected to the outdoor unit connection terminals 16a and 15b.
16b will be described. In this case, the voltage applied to the negative input terminal of the voltage comparator 21 is generated between the control power lines 6a and 6b by a series resistor 19b connected in series with a parallel resistor 19a and temperature sensor 10, and a resistor 19c. The voltage is obtained by dividing the voltage. The voltage within the range of resistance value change of the temperature sensor 10 is amplified by the detection signal amplification circuit 18 and inputted to the controller, where it is A/D converted to detect the outdoor temperature, and the input voltage detection means 21 detects the outdoor temperature. The input voltage is detected, and the predetermined voltage range/inside/outside detection means 22 detects whether the range of change thereof is within a predetermined range. Since it is set to be within a predetermined range when the connection is normal, the detection means 22 detects within the predetermined range, and at that time, the output level of the controller to the display 24 becomes L, and the light emitting diode 25 of the display 24 lights up. do not.
After confirming that the connection is normal due to the non-lighting, the switch 17 is turned on to supply power to the outdoor unit 2.

Next, suppose that the cables 12a, 12b connected to the indoor unit connection terminals 15a, 15b are mistakenly wired to the connection terminals 14a, 14b of the outdoor unit 2. At this time, cable 1 is connected between terminals 15a and 15b.
The parallel resistances of the compressor motor 8 and outdoor fan 9 are connected via 2a and 12b, and this parallel resistance value (several ohms to several tens of ohms) is within the normal temperature change range of the temperature sensor 10. Since the value is much lower than the value (on the order of KΩ), the output voltage of the amplifier circuit 18 is considerably smaller than usual. This voltage is input to the controller, where the input voltage detection means 21 detects the input voltage, and the predetermined voltage range/inside/outside detection means 22 detects whether the variation range of the input voltage is within a predetermined range. At this time, the voltage change range becomes considerably small and falls outside the predetermined range, so the detection means 22 detects the outside of the predetermined range, and the output level of the controller to the display 24 at that time becomes H, and the light emitting diode 25 of the display 24 lights up. This confirms that the wiring is incorrect, so the incorrect wiring is corrected, and after confirming that the light emitting diode 25 is turned off, the switch 17 is turned on.

In the above embodiments, the light emitting diode 25 lights up when there is incorrect wiring and turns off when there is normal wiring, but other displays may be used, such as blinking repeatedly when there is incorrect wiring and continuously turning on when there is normal wiring.

[Effects of the Invention] As described above, the present invention inputs voltages that differ depending on whether the load connected between the connection terminals of the detection signal transmission cable is a detection element or a power load into the controller, and displays the voltage accordingly. Since the display is displayed on the device, incorrect wiring can be reliably detected and displayed by simply changing the circuit configuration, and failures due to incorrect wiring can be prevented by simply preparing one type of cable. This has the effect of providing an externally separated air conditioner.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a block diagram showing the electrical wiring of a conventional indoor/outdoor separated type air conditioner. In the figure, 1 is an indoor unit, 2 is an outdoor unit, 4 is an indoor fan, 7 is a controller, 8 is a pressure machine motor, 9 is an outdoor fan, 10 is an outdoor temperature sensor, 11a, 11
b is a power supply cable, 12a and 12b are detection signal transmission cables, 15a and 15b are detection signal transmission cable connection terminals of indoor units, 20 is a load difference detection means, and 24 is an indicator. The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1 The indoor unit is equipped with a controller such as an indoor fan and a microcomputer, and the outdoor unit is equipped with a power load such as a compressor motor and an outdoor fan, and a detection element such as an outdoor temperature sensor, and these indoor and outdoor units are connected to the indoor unit. A power supply cable from the outdoor unit to the outdoor unit power load and a detection signal transmission cable from the outdoor unit's detection element to the indoor unit's controller are connected via the indoor unit/outdoor unit terminal block. In an externally separated air conditioner, there is a detection signal amplification circuit that amplifies the voltage between the connection terminals of the detection signal transmission cable of the indoor unit, and the magnitude of the input voltage from this detection signal amplification circuit to the controller is load difference detection means in the controller for detecting whether the load connected between the connection terminals of the detection signal transmission cable is within a predetermined detection range of the detection element or outside the detection range; 1. A separate indoor/outdoor air conditioner, comprising: a display for displaying detection by a controller.