JPS61223447A - Air conditioning control system - Google Patents

Abstract

PURPOSE:To permit to estimate temperature rise quickly without providing a temperature sensor by a method wherein the system is consisting of N sets of package type air-conditioning machines, which satisfy the load capacity of an air conditioning temperature control zone, M sets of the package type air-conditioning machines for preliminary use and a central control unit while an alarm is outputted when the set of troubled package type air-conditioning machines becomes more than M sets. CONSTITUTION:A plurality of package type air-conditioning machines 3 is consisting of N sets of the same machines, which satisfy the load of the air conditioning temperature control zone 1 upon the maximum load thereof, and M sets of the same machines for preliminary use. The air-conditioning machine control unit 4 controls the package type air-conditioning machine 3. Signal collecting and converting unit 7 is provided for respective package type air-conditioning machines and treats signals from respective package type air-conditioning machines or a digital output signal as control signals for respective package type air-conditioning machines. The central control unit 6 checks the number of sets of air-conditioning machines being in trouble in every zones through the signal collecting and converting unit 7 and outputs the necessary alarm by the comparison of the sets of machines in reserve with the set of troubled machines.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an air conditioning control system, and particularly to an air conditioning control system that does not use a temperature sensor for detecting temperature abnormality within an air conditioning temperature control zone.

(Prior art) In order to detect temperature abnormalities within a temperature control zone, a conventional method is to place a temperature sensor within the zone and detect whether the temperature within the zone exceeds preset upper and lower limits. It is being In systems with tight control ranges, such as electronic exchanges, the upper and lower limit ranges are narrowed to detect temperature abnormalities early. In other words, as shown in the configuration diagram of the conventional air conditioning control system in Fig. 2,
In the control instrumentation system, air conditioning temperature control zone 1
In order to control the temperature, the cage-type air conditioner 3 monitors the return temperature using an internal sensor and blows cooled air into the air conditioning temperature control zone 1 as necessary.

Further, a temperature sensor 2 is provided in the air conditioning temperature control zone 1, and the temperature sensor 2 measures the temperature in the air conditioning temperature control zone 1.The measured temperature data is converted into an analog signal or a digital signal, and a signal is sent via the signal line t1. The signal is sent to the collection conversion device 5 and further sent to the central control device 6 via the signal line t3. The control output from the central control device 6 to the air conditioning control unit 4 is sent via the signal line L3, the signal collection and conversion device 5, and the signal line t2.

The air conditioner 3 is provided with a spare unit.

In such a system, in order to detect the above-mentioned abnormal temperature, the upper and lower limits are narrower than the normal upper and lower limits ULt and LLl, as shown in FIG. Limits UL2 and LL2 are set to see if the temperature t in the air conditioning temperature control seam 71 exceeds this range.

(Problems to be solved by the invention) - Since the packaged air conditioner has a certain degree of control function, the signals sent from the packaged air conditioner to the central control unit include on/off signals for blowers, etc., and alarms. The signal is a digital input such as a signal, and the signal to the air conditioner is a digital output such as a start signal.

However, in order to detect temperature abnormalities as described above, there is a drawback in that the signal collection and conversion device must have an analog/digital conversion function to process analog input from the temperature sensor. From a cost perspective, analog input functionality was more than four times as expensive as digital input. Furthermore, even if a temperature sensor detects a temperature abnormality, if the temperature rises rapidly, it is already too late.
There was a problem in that it affected electronic exchanges and the like.

(Means for solving the problem) In order to solve the above problem, N package air conditioners that satisfy the load capacity of the air conditioning temperature control zone and a spare M
It consists of a mother package air conditioner in the form of a package (M≧1), a central control device, and a signal collection conversion device that exchanges data between the package air conditioner and the central control device, When the information signal of the number of failed cage-type air conditioners from the signal collection conversion device exceeds M units, a temperature abnormality budget alarm is output to the central control device.
In addition, the signal collection and conversion device was configured to control only the number of people using digital signals.

(Function) Since the present invention is configured as described above, it is possible to predict temperature abnormalities in the air conditioner temperature control zone without providing a temperature sensor within the zone, and even if the temperature rises suddenly when the air conditioner fails, This is an action that can quickly predict and control the temperature rise.

(Example) The present invention will be described with reference to the drawings. Figure 1 (, ) is a configuration diagram of an air conditioning temperature control system according to an embodiment of the present invention.
b) is a circuit block diagram of a signal collection and conversion device according to an embodiment of the present invention, and FIG. be.

In Figure 1 (,), 1 is an air conditioning temperature control zone, 3 is a packaged air conditioner, 4 is an air conditioner control unit, 6 is a central control unit, 7 is a signal collection and conversion device that handles only digital signals, and A2 is a signal A signal line A3 between the collection conversion device 7 and the air conditioner control unit 4 is a signal line between the central control device 6 and the signal collection conversion device 2. A plurality of packaged air conditioners 3 blow out cooled air as shown by the arrows to the air conditioning temperature control zone IK, and also circulate the air.

Multiple packaged air conditioners 3, air conditioning temperature control seat 71
The system consists of N units that meet the maximum load requirements and M standby units. The air conditioner control unit 4 controls the cage type air conditioner 3, and the signal line t2, the signal collection and conversion device 7, and the signal line t3 control the signal between the cage type air conditioner 3 and the central control device 6. It becomes a medium of exchange. The signal collection and conversion device 7 is provided for each package type air conditioner, and receives signals from each package type air conditioner, such as digital input signals for the operating status of the blower, compressor, etc., and alarms such as failures. ,
It also handles digital output signals as control signals to each packaged air conditioner.

The device CPU, 27 is a read-on memory ROM,,',?
23 is a random access memory RAM, 23 is a communication interface, 24 is a dinotal input interface, 25 is a digital output interface, and t13 is a path line connecting these. The central processing unit CPU20 is a ROM
Based on the program stored in RAM 22
Control calculations are performed using the data.

It has a communication interface 23 for exchanging signals with the upper central control unit 6, and further includes an input interface 24 for digital input signals from the packaged air conditioner and a digital output interface 25 for digital output signals. have.

FIG. 1(c) is a flowchart of a method for detecting temperature abnormality in the system configuration of the present invention that handles only digital signals such as on/off signals of switches, as described above. 30 is a step of checking the number of failed air conditioners in the air conditioning temperature control zone; 3 is a step of determining whether there is a failed air conditioner; 32 is a step of determining whether the number of failed air conditioners is greater than the number of spare units. ,3
3 is a step for outputting a heavy warning, and 34 is a step for outputting a light warning. It is assumed that the number of packaged air conditioners 3 that satisfy the maximum load is N units and the number of standby units is M units. The central control device 6 first checks how many devices are currently out of order for each zone via the signal collection and conversion device 7 (Stella 7°30). Let the number of failed devices be n. Check whether the number of failed units n is one or more (step 3). If the number of failed machines is 1 or more, there are M spare machines, so
Step 3: Check whether the number of failed units is M or more.
2) For example, if it is (M+1) or more, a heavy warning is outputted (step 33), and if it is less than M, a light warning is outputted (STELLA 7'J4). Various criteria can be considered for determining the light warning and single warning described above, and various warning stages can be set.

(Effects of the Invention) As explained above, in the present invention, in an air conditioning system consisting of multiple IP cage type air conditioners, necessary alarms are output by comparing the number of spare units and the number of failure units, and the air conditioning temperature is controlled. By providing early notification of temperature abnormalities within the zone, - The signal collection and conversion device between the seven-cage air conditioner and the central controller only needs to handle input and output of digital signals, resulting in low cost. This has the advantage that the system can be configured using

[Brief explanation of drawings]

FIG. 1(a) is a block diagram of an air conditioning temperature control system according to an embodiment of the present invention, FIG. 1(b) is a circuit block diagram of a signal collection and conversion device according to an embodiment of the present invention, and FIG. ) is a flowchart showing an example of a method for notifying temperature abnormalities according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional air conditioning control system, and FIG. 3 is a conventional method for detecting temperature abnormalities. FIG. 1... Air conditioning temperature control zone, 2... Temperature sensor, 3
...and cage type air conditioner, 4...Air conditioner control unit, 5...Signal collection and conversion device (handles analog signals and digital signals), 6...Central control device, 7...
・Signal collection conversion device, Al m42 * L3...
Signal line, 20...Central processing unit CPU, 21...R
OM, 22...RAM, 2.7...Communication interface, 24...Digital input interface, 25
...Digital output interface, 113...Pass line, t...Temperature, UL! ...upper limit,
LLl...lower limit, UL2...narrow upper limit, )%LL2...narrow lower limit, SP...
・Setting value. Patent applicant: Nippon Telegraph and Telephone Public Corporation (and one other person) Figure 1 (
a) Figure 1 (b) Figure 2

Claims (1)

[Scope of Claims] N package-type air conditioners that satisfy the load capacity of an air conditioning temperature control zone, and M package-type air conditioners for backup;
The air conditioning control system consists of a central control unit, and signals are sent and received between the central control unit and the packaged air conditioner via a signal collection and conversion device via signal lines. The signal collection and conversion device performs input/output control of only digital signals, including input signals of alarm signals including operating status and failure of the packaged air conditioner, and on/off output signals, and the central control device , an air conditioning control system characterized by outputting an alarm when the number of failed package air conditioners exceeds M units.