JP5849247B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system that controls a VAV unit by a command signal transmitted from a VAV (Variable Air Volume) controller connected to a central monitoring device, and controls an air blowing capacity to each air conditioned space.

  2. Description of the Related Art Conventionally, an air conditioning system having a VAV (variable air volume) unit for controlling the air volume from an air conditioner individually according to the temperature status of each of a plurality of air-conditioned spaces is known. In this air conditioning system, if the temperature difference in the room is large, the air volume is increased to adjust the air volume corresponding to the temperature difference, thereby reducing the temperature difference in the room, and gradually decreasing the air volume as it approaches the set temperature. . Thereby, the burden on the air conditioner can be reduced, and the running cost can be reduced and the energy can be saved.

  The air conditioning system includes, for example, a central monitoring device, a VAV controller, a VAV unit, and the like. The VAV unit can open and close a damper by a damper opening / closing command signal from the VAV controller and perform fine air volume adjustment. The central monitoring device issues a start / stop command for the VAV unit, and displays the control status of each VAV unit on the screen based on the status signal returned from the VAV controller.

  In the sequence example of the air conditioning system shown in FIG. 13, the VAV controller 101 receives a start / stop signal from the central monitoring apparatus 102 (S131), and transmits a damper open / close command signal to the VAV unit 103 based on the start / stop command (S132). ). Further, the VAV controller 101 transmits the same content as the start / stop command received from the central monitoring apparatus 102 via the CPU to the central monitoring apparatus 102 as a current state signal (S133). The central monitoring device 102 confirms the current control state of each VAV unit 103 based on this state signal.

  By the way, a VAV control system that makes it possible to easily adjust the air conditioning for each individual air-conditioned space by giving a full-open command, a command for setting the maximum air volume, etc. to the respective VAV units collectively as needed when necessary. An adjustment method is also known (see, for example, Patent Document 1).

JP-A-8-271027

  However, in the conventional air conditioning system described above, the VAV controller 101 transmits a status signal that matches the received start / stop signal to the central monitoring device 102 without actually confirming the current status of the VAV unit 103 that is hardware. ing. For this reason, the central monitoring apparatus 102 cannot recognize the failure state of the VAV unit 103 even when a failure has occurred in the VAV unit 103, and has a problem of erroneously determining the operation state of the VAV unit 103.

  The present invention has been made in view of the above problems, and can determine the operation state of a VAV unit controlled by a VAV controller and prevent an erroneous recognition of the operation of the VAV unit in the central monitoring apparatus. The purpose is to provide.

In order to achieve the above object, the present invention comprises a central monitoring device, a VAV controller connected to the central monitoring device, and a VAV unit that is controlled by the VAV controller and variably controls the air volume into the conditioned space. In the air conditioning system, the VAV controller obtains damper control means for instructing opening / closing of a damper provided in the VAV unit based on an on / off signal received from the central monitoring device, and control information necessary for controlling the VAV unit. an acquisition unit that, using the switching command and the control information, and a determining means for determining operating conditions of the VAV unit, to the control information, the damper opening degree detecting unit provided in front Symbol VAV unit damper high degree signal detected, vs. prior Symbol Danpamota for driving a damper provided in VAV unit That the damper open command time, and are included between when the damper close command, the judging means, wherein the damper open command time - difference calculated by the expression that the damper close command time becomes a predetermined time or more, the When the damper high opening signal is not detected, the damper motor is determined to be in failure.

In this air conditioning system, the determination unit further transmits a damper open signal as the opening / closing command, and then when the wind speed signal acquired by the acquiring unit from a wind speed sensor provided in the VAV unit is equal to or less than a predetermined value, or the opening / closing After transmitting a damper closing signal as a command, it is preferable to determine that the VAV unit has a damper failure when the wind speed signal acquired by the acquiring means is equal to or greater than a predetermined value.

In the air conditioning system, the determination unit further transmits a damper opening signal as the opening / closing command, and then the damper opening degree signal detected by the damper high opening degree signal or the damper opening degree detecting unit provided in the VAV unit. And the wind speed signal is 0 or less, or after transmitting a damper close signal as the opening / closing command, the damper high opening signal and the damper proper opening signal are not detected, and the wind speed signal If is not less than 0, it is preferable to determine that the wind speed sensor of the VAV unit is faulty.

In this air conditioning system, before Symbol judging means further the damper close command time - difference calculated by the expression that the damper open command time becomes a predetermined time or more and the damper high degree signal or damper suitability opening If a signal is detected, it is preferable to determine that the damper motor is faulty.

In this air conditioning system, the acquisition unit further acquires, as the control information, a total number of control commands from the damper control unit per unit time to the damper motor provided in the VAV unit, and the determination unit includes the control information When the total number of commands is equal to or greater than a certain number, it is preferable to determine that the maintenance time of the VAV unit is present.

In the air conditioning system, the acquisition unit further acquires, as the control information, an integrated value of a damper open command time and a damper close command time to the damper motor provided in the VAV unit from the damper control unit per unit time. The determination means preferably determines the replacement time of the damper motor when the integrated value is equal to or longer than a predetermined time.

  In this air conditioning system, it is preferable that the damper control means stops a control command output to the damper motor of the VAV unit for a predetermined time when the determination means determines that the maintenance time or the replacement time.

  In this air conditioning system, it is preferable that the VAV controller includes a transmitting unit that transmits the determination result to the central monitoring device, and the central monitoring device includes a display unit that displays the determination result on a screen.

  According to the present invention, the VAV controller determines the state of the VAV unit using the damper opening / closing command signal and the control information acquired from the VAV unit, and transmits the determination result to the central monitoring device. Therefore, it is possible to determine the operation state of the VAV unit in the VAV controller and to prevent the central monitoring device from erroneously recognizing the state of the VAV unit.

The block diagram of the air conditioning system which concerns on embodiment of this invention is shown. The functional diagram of the same air conditioning system is shown. The functional block diagram of the VAV controller and VAV unit which are provided in the same air conditioning system is shown. It is a sequence diagram which shows the data flow of the whole air conditioning system same as the above. It is a flowchart which shows the operation | movement procedure of the VAV controller of an air conditioning system same as the above. It is a sequence diagram which shows the data flow of the whole air conditioning system which concerns on the modification 1 of embodiment same as the above. It is a flowchart which shows the operation | movement procedure of the VAV controller of an air conditioning system same as the above. It is a sequence diagram which shows the data flow of the whole air conditioning system which concerns on the modification 2 of embodiment same as the above. It is a flowchart which shows the operation | movement procedure of the VAV controller of an air conditioning system same as the above. It is a flowchart which shows the operation | movement procedure of the VAV controller of the air conditioning system which concerns on the modification 3 of embodiment same as the above. It is a flowchart which shows the operation | movement procedure of the VAV controller of the air conditioning system which concerns on the modification 4 of embodiment same as the above. It is a flowchart which shows the operation | movement procedure of the VAV controller of the air conditioning system which concerns on the modification 5 of embodiment same as the above. It is a sequence diagram which shows the data flow of the conventional air conditioning system whole.

(Embodiment)
An air conditioning system according to an embodiment of the present invention will be described with reference to FIGS. An air conditioning system S shown in FIG. 1 is used for monitoring and controlling air conditioning equipment in a large-scale office building, and includes a central monitoring device 1, a core unit 2, a VAV controller 3, a setting device 4, and a VAV unit 5. And an air conditioner 6 and an I / O 7. Each device is connected for communication via the bus 8.

  The central monitoring device 1 is a desktop or wall-mounted computer for centrally managing the air conditioning system S. The central monitoring device 1 acquires data such as room temperature, blowing temperature, actual air volume, damper opening information, etc. sent from each VAV unit 5 to the VAV controller 3 and displays them on the screen. The central monitoring device 1 also provides start / stop signals (damper ON / OFF signals) to be given to the respective VAV units 5, changes in indoor temperature setting values, changes in maximum / minimum air volume setting values, cooling / warming switching, and maximum air volume operation. Or the like is transmitted to the VAV controller 3 via the bus 8.

  The user can monitor the operating state of each VAV unit 5 by operating the central monitoring device 1 via a computer screen display, and can change various setting values of the VAV unit 5 individually or collectively.

  The core unit 2 arbitrarily selects and expands the I / O 7 of the air conditioner 6 according to the control target. The core unit 2 is connected to the central monitoring device 1 through the bus 8 to receive a control signal from the central monitoring device 1 and transmit an operation status. Further, the core unit 2 is communicatively connected to the VAV controller 3 and controlled in conjunction with the VAV unit 5.

  The VAV controller 3 is used by being attached to the VAV unit 5 and calculates the required air volume of the VAV unit 5 for each air-conditioned space from the detected value of the wind speed sensor and the indoor measured temperature detected by the temperature sensor 3a. The air volume is controlled by adjusting the opening of the damper. Each air-conditioned space is provided with a temperature sensor, and the VAV controller 3 detects a temperature deviation between the set temperature of each air-conditioned space and the actual temperature.

  The VAV controller 3 is connected to the central monitoring apparatus 1 via the bus 8 and includes a CPU 30 for receiving a start / stop signal and transmitting a failure state of the VAV unit 5 determined by a determination unit described later. . Further, the VAV controller 3 communicates with the core unit 2 to control the fan rotation speed and the like of the air conditioner 6 in order to realize interlock control between the VAV unit 5 and the air conditioner 6.

  As shown in FIG. 2, the setting device 4 is an indoor remote controller that is connected to the VAV controller 3 through a signal line and is used together with the VAV controller 3 when controlling the VAV unit 5. (ON / OFF) and temperature setting operation input are possible. The setting device 4 displays the on / off state of the VAV unit 5, operation display, room temperature display, and the like using a liquid crystal display. Note that the setting device 4 may incorporate a temperature sensor and have a room temperature measurement function or a room temperature setting function.

  The VAV unit 5 is communicatively connected to the VAV controller 3 and is connected to the air conditioner 6 via the duct 9. This VAV unit 5 is provided with a damper attached to the duct 9 for variably controlling the air volume of each air-conditioned space, and adjusts the opening degree of the damper based on an open / close command signal received from the VAV controller 3 to each air-conditioned space. Adjust the temperature. The VAV unit 5 includes a wind speed sensor disposed on the upstream side of the damper, and transmits a wind speed signal detected by the wind speed sensor to the VAV controller 3.

  The air conditioner 6 includes a blower that is rotationally driven by a motor, a heat exchanger, an inverter, and the like, and supplies cool air and warm air to a plurality of air-conditioned spaces through a duct 9 connected to the air conditioner 6. A VAV unit 5 is provided between the duct 9 and the conditioned space, and conditioned air is blown out to each conditioned space through the VAV unit 5. The air conditioner 6 is communicatively connected to the core unit 2 via the I / O 7 and receives a command from the VAV controller 3 such as the fan speed.

  Next, functional configurations of the VAV controller 3 and the VAV unit 5 used in the air conditioning system S according to the present embodiment will be described with reference to FIG. In FIG. 1, the core unit 2 is arranged between the central monitoring device 1 and the VAV controller 3. However, in the present invention, the core unit 2 is not an indispensable configuration. Detailed description is omitted.

  The VAV controller 3 includes a temperature detection unit 31, a calculation unit 32, a damper control unit 33, a determination unit 34, and a transmission / reception unit (acquisition unit) 35. The temperature detection unit 31 is a temperature sensor 3a or the like that detects the room temperature by changing the resistance value. The calculation unit 32 calculates the required air volume based on the room temperature detected by the temperature detection unit 31 and the set temperature, and calculates the damper opening of the VAV unit 5 based on the air volume. The damper control unit 33 generates a damper opening / closing command for the VAV unit 5 based on the damper opening calculated by the calculation unit 32. The determination unit 34 determines abnormality of the VAV unit 5 using control information such as a wind speed signal that is a signal necessary for control of the VAV unit 5. The transmission / reception unit 35 transmits / receives an on / off signal, control information, an opening / closing command signal, and the like to / from the central monitoring device 1, the core unit 2, and the VAV unit 5.

  As shown in FIGS. 2 and 3, the VAV unit 5 includes a damper motor 51, a damper opening degree detection unit 52, and a wind speed sensor 53. The damper motor 51 drives the damper to open and close by an electric signal. The damper opening degree detection unit 52 is a mechanical type attached to the damper for detecting a damper appropriate opening degree (for example, an opening degree of 75%) and a damper high opening degree (for example, an opening degree of 90% or more) based on the rotation angle of the damper. Limit switch. The damper appropriate opening signal and the damper high opening signal detected by the damper opening detector 52 are transmitted to the VAV controller 3. The wind speed sensor 53 is a sensor that can detect an accurate air volume in the duct 9, and the detected wind speed signal is transmitted to the VAV controller 3.

  Next, the operation of the air conditioning system S according to the present embodiment will be described with reference to FIG. First, the central monitoring apparatus 1 transmits an on / off signal for controlling opening / closing of the damper of the VAV unit 5 to the VAV controller 3 (S41).

  Then, the VAV controller 3 transmits a damper opening / closing command based on the start / stop signal to the VAV unit 5 (S42), and waits for a predetermined effect waiting period in order to receive the wind speed signal from the VAV unit 5. During this waiting period, the VAV unit 5 performs the opening control or the closing control of the damper based on the opening / closing command, detects the wind speed using the wind speed sensor, and transmits the wind speed signal to the VAV controller 3.

  Next, the determination unit 34 of the VAV controller 3 determines the current state of the damper of the VAV unit 5 based on the wind speed signal received from the VAV unit 5 (S43). Then, the VAV controller 3 transmits the determination result of the start / stop state and the damper state of the VAV unit 5 to the central monitoring device 1, and the central monitoring device 1 receives the state and displays it on the screen (S44).

  Next, the operation of the VAV controller 3 in the air conditioning system S according to the present embodiment will be described with reference to FIG. First, the VAV controller 3 checks whether or not a start / stop signal is received from the central monitoring apparatus 1 (S51). When the start / stop signal is received (YES in S51), the VAV controller checks whether the start / stop signal is a damper open command or a damper close command (S52).

  If the start / stop signal is a damper opening command (YES in S52), the VAV controller 3 waits for a predetermined effect waiting period (S53), and then whether or not the received wind speed signal is greater than X (m / s). Is determined (S54). When the wind speed signal is greater than X (m / s) (YES in S54), the determination unit 34 transmits a status signal “no damper failure” to the central monitoring device 1 (S55). On the other hand, when the wind speed signal is smaller than X (m / s) (NO in S54), the state signal “damper failure” is transmitted to the central monitoring apparatus 1 (S56).

  If the start / stop signal is an OFF command (NO in S52), the VAV controller 3 waits for a predetermined effect waiting period (S57), and then determines whether the received wind speed signal is equal to or less than X (m / s). (S58). If the wind speed signal is less than or equal to X (m / s) (YES in S58), the determination unit 34 transmits a status signal “no damper failure” to the central monitoring device 1 (S59). On the other hand, if the wind speed signal is not less than X (m / s) (NO in S58), a status signal “damper failure” is transmitted to the central monitoring device 1 (S60).

  As described above, in the air conditioning system S according to the present embodiment, the operation determination of the damper of the VAV unit 5 is easily performed with high accuracy by the VAV controller 3 without taking in a separate signal from the VAV unit 5. Can do. Therefore, the central monitoring apparatus 1 can determine the failure of the damper of the VAV unit 5 at the current time based on the determination result received from the VAV controller 3.

(First modification)
A first modification of the present embodiment will be described with reference to FIGS. In this modification, the VAV controller 3 performs failure determination of the wind speed sensor of the VAV unit 5 using the wind speed signal received from the VAV unit 5 and the damper high opening signal or the damper appropriate opening signal. In addition, the same code | symbol is attached | subjected to the structure similar to the air conditioning system S which concerns on the said embodiment, and the detailed description is abbreviate | omitted (hereinafter the same).

  The operation procedure of the air conditioning system S according to the first modification will be described with reference to FIG. First, the central monitoring apparatus 1 transmits the start / stop signal of the VAV unit 5 to the VAV controller 3 (S61). Then, the VAV controller 3 transmits an opening / closing command signal based on the start / stop signal to the VAV unit 5 (S62), and waits for a predetermined waiting period in order to receive the wind speed signal from the VAV unit 5 side. During this time, the VAV unit 5 performs damper open / close control based on the command signal, detects the damper proper opening and damper high opening using the damper opening detector 52, and detects the wind speed using the wind speed sensor 53. And the detection result is transmitted to the VAV controller 3 (S63).

  Next, the determination unit 34 of the VAV controller 3 determines the current state of the wind speed sensor of the VAV unit 5 based on the damper opening degree signal received from the VAV unit 5 and the wind speed signal. Then, the VAV controller 3 transmits the start / stop state of the VAV unit 5 and the determination result of the wind speed sensor as a state signal to the central monitoring device 1 (S64), and the central monitoring device 1 receives the state and displays it on the screen.

  Next, the operation of the VAV controller 3 in the air conditioning system S according to the first modification will be described with reference to FIG. First, the VAV controller 3 checks whether or not a start / stop signal is received from the central monitoring apparatus 1 (S51). When the start / stop signal is received (YES in S51), the VAV controller checks whether the start / stop signal is a damper open command or a damper close command (S52).

  When the start / stop signal is a damper opening command (YES in S52), the determination unit 34 receives a damper proper opening signal or a damper high opening signal within a predetermined effect waiting period waiting (S53) (S71). And YES), and it is determined whether the wind speed signal is 0 (m / s) or more (S72). The determination unit 34 receives the damper high opening signal or the damper appropriate opening signal (when the damper is open), and when the wind speed signal is greater than 0 (m / s) (YES in S72), the state signal “ “No wind speed sensor failure” is transmitted to the central monitoring device 1 (S73). On the other hand, if the damper proper opening signal or the damper high opening signal is detected (YES in S71) and the wind speed signal is not 0 (m / s) or more (NO in S72), the determination unit 34 determines the wind speed sensor 53. State signal “wind speed sensor failure” is transmitted to the central monitoring apparatus 1 (S74).

  When the start / stop signal is a damper close command (NO in S52), the determination unit 34 waits for a predetermined effect waiting period (S57) and then does not receive a proper damper opening signal or a high damper opening signal (S57). Whether or not the wind speed signal is 0 (m / s) or less is determined (S76). When the determination unit 34 does not receive the damper proper opening degree or damper high opening degree signal (YES in S75) and is equal to or less than the wind speed signal 0 (m / s) (YES in S76), the state signal “wind speed sensor” is determined. “No failure” is transmitted to the central monitoring apparatus 1 (S77). On the other hand, the determination unit 34 detects both the damper high opening signal and the damper appropriate opening signal (YES in S75), and the received wind speed signal is not less than 0 (m / s) (NO in S76). A state signal “wind speed sensor failure” is transmitted to the central monitoring device 1 (S78).

  As described above, in the air conditioning system S according to the first modification, the VAV controller 3 simply does not take in a separate signal from the VAV unit 5 and the VAV controller 5 simply and accurately uses the wind speed sensor. The operation can be judged. Therefore, the central monitoring apparatus 1 can determine the failure of the wind speed sensor of the VAV unit 5 at the current time based on the determination result received from the VAV controller 3.

(Second modification)
An air conditioning system according to a second modification of the present embodiment will be described with reference to FIGS. In the second modification, the VAV controller 3 determines a failure of the damper motor using the opening / closing command time for the damper motor and the damper high opening signal.

  The operation procedure of the air conditioning system S according to the second modification will be described with reference to FIG. First, the central monitoring apparatus 1 transmits the start / stop signal of the VAV unit 5 to the VAV controller 3 (S81). The VAV controller 3 transmits a damper opening / closing command signal to the VAV unit 5 based on the start / stop signal (S82). During this time, the VAV unit 5 performs damper open control or close control based on the command signal, detects the damper high opening signal using the damper opening detector 52, and detects the damper height detected by the VAV controller 3. An opening signal is transmitted (S83).

  Next, the determination unit 34 of the VAV controller 3 determines a damper motor abnormality of the VAV unit 5 using the damper opening command time, the damper closing command time, and the damper high opening degree signal. Then, the VAV controller 3 transmits the start / stop state of the VAV unit 5 and the abnormality determination result of the damper motor as state signals to the central monitoring device 1 (S84), and the central monitoring device 1 receives the state and displays it on the screen.

  Next, the operation of the VAV controller 3 in the air conditioning system S according to the second modification will be described with reference to FIG. First, the calculation unit 32 of the VAV controller 3 calculates a difference between “damper open command time−damper close command time” (S91). When the difference is equal to or longer than a certain time (YES in S91) and the damper high opening signal is not received (NO in S92), the determination unit 34 considers that the damper motor has failed, Is transmitted to the central monitoring apparatus 1 (S93). On the other hand, if the difference is equal to or longer than a certain time (YES in S91) and the damper high opening signal is received (YES in S92), the determination unit 34 determines that the damper motor is operating normally and A status signal of “no damper motor failure” is transmitted to 1 (S94).

  Here, exemplifying the operation of the second modification, the VAV unit 5 is configured such that when the damper opening signal continues for 100 seconds, the damper is in a 100% open state, and when the damper closing signal is continued for 100 seconds, the damper is changed from a 100% open state to a closed state. Assume. The detection of the damper high opening signal in the damper opening detector 52 is transmitted with the damper 90% open. In this case, when (damper open signal time−damper close signal time) ≧ 90 seconds, the VAV controller 3 receives the damper high opening signal. Therefore, the determination unit 34 of the VAV controller 3 transmits a status signal “damper motor failure” to the central monitoring device 1 if the damper high opening signal is not received when the difference is 90 seconds or more.

  As described above, in the air conditioning system S according to the second modification, the operation of the damper motor of the VAV unit 5 is simply and accurately performed by the VAV controller 3 without taking in a separate signal from the VAV unit 5. Judgment is possible. Therefore, the central monitoring apparatus 1 can determine the failure of the damper motor of the VAV unit 5 at the current time based on the determination result received from the VAV controller 3.

(Third Modification)
A third modification of the present embodiment will be described with reference to FIG. In the present modification, the VAV controller 3 performs failure determination of the damper motor using the opening / closing command time for the damper motor, the damper high opening signal, and the damper appropriate opening signal.

  The operation of the VAV controller 3 in the air conditioning system S according to Modification 3 will be described with reference to FIG. First, the calculation unit 32 of the VAV controller 3 calculates a difference of “damper close command time−damper open command time” (S101). When the difference becomes equal to or longer than a certain time (YES in S101) and the damper high opening signal or the proper damper opening signal is received (YES in S102), the determination unit 34 performs central monitoring of “damper motor failure”. It transmits to the apparatus 1 (S104). On the other hand, when the difference becomes equal to or longer than a certain time (YES in S101) and the damper high opening signal or the proper damper opening signal is not received (NO in S102), the determination unit 34 notifies the central monitoring device 1 to “damper motor”. A status signal “no failure” is transmitted (S103).

  Here, exemplifying the operation of the third modification example, the VAV unit 5 is, for example, a damper opened signal that is 100% continuous when the damper is opened for 100 seconds, and a damper that is closed from the 100% opened state when the damper closed signal is continued for 100 seconds. Suppose that It is assumed that the detection of the damper high opening signal in the damper opening detection unit 52 is transmitted in a state in which the damper is 90% open, and the detection of the damper proper opening signal is transmitted in a state in which 75% is opened. In this case, when (damper closing signal time−damper opening signal time) ≧ −75 seconds, the VAV controller 3 does not detect the damper high opening signal and the damper appropriate opening signal. Therefore, the determination unit 34 of the VAV controller 3 transmits the status signal “damper motor failure” to the central monitoring device 1 when the difference is −75 seconds or more and the damper high opening signal or the damper appropriate opening signal is received. To do.

  As described above, in the air conditioning system according to the third modification, as in the second modification, the operation of the damper motor can be simply and accurately performed by the VAV controller 3 without taking in a separate signal from the VAV unit 5. Judgment is possible. Therefore, the central monitoring device 1 can determine the failure of the damper motor at the current time based on the determination result received from the VAV controller 3.

(Fourth modification)
A fourth modification of the present embodiment will be described with reference to FIG. In the fourth modification, the VAV controller 3 determines the maintenance (adjustment failure) of the VAV unit 5 using the number of opening / closing command signals to the damper motor of the VAV unit 5 per unit time.

  The operation of the VAV controller 3 in the air conditioning system S according to Modification 4 will be described with reference to FIG. First, the determination unit 34 of the VAV controller 3 determines whether or not the total number of outputs of the damper open command and the damper close command per unit time is equal to or greater than a predetermined number (S111). Next, when the total number of damper opening / closing commands per unit time is equal to or greater than a certain number (YES in S111), the determination unit 34 determines that the VAV unit 5 is performing a hunting operation due to poor control adjustment, and maintains the maintenance signal “ON Is transmitted to the central monitoring apparatus 1 (S112). Then, the VAV controller 3 stops outputting the damper close command or the damper open command signal to the VAV unit 5 for a certain time (S114). The hunting operation in this case is an operation in which the damper repeats opening and closing within a predetermined period. On the other hand, when the number of damper motor control commands per unit time is equal to or less than the predetermined number (NO in S111), the determination unit 34 transmits a maintenance signal “OFF” to the central monitoring device 1 (S113).

  As described above, in the air conditioning system according to the fourth modification, the VAV controller 3 can easily determine the maintenance of the VAV unit 5 without taking in a separate signal from the VAV unit 5. Further, when the maintenance determination is made, the VAV controller 3 can suppress the hunting operation of the VAV unit 5 based on the maintenance signal by stopping the output of the damper opening / closing command signal for a predetermined time.

(Fifth modification)
A fifth modification of the present embodiment will be described with reference to FIG. In the fifth modification, the VAV controller 3 simply accumulates the operation time of the damper motor using the opening / closing command time (internal information) for the damper motor, and determines the damper motor life time of the VAV unit 5.

  The operation of the VAV controller 3 in the air conditioning system S according to Modification 5 will be described with reference to FIG. First, the determination unit 34 of the VAV controller 3 determines whether or not the integrated value of the output time of the damper opening command time and the damper closing command time per unit time is equal to or longer than a certain time (S121). Then, when the integrated value per unit time is equal to or longer than a predetermined time (YES in S121), the determination unit 34 determines that the replacement time has been reached due to the life of the damper motor, and sends a maintenance signal “ON” to the central monitoring device 1. Transmit (S122). Then, the damper closing command signal or the damper opening command signal is not output from the VAV controller 3 (S124). On the other hand, when the integrated value is equal to or shorter than the predetermined time (NO in S121), the determination unit 34 transmits a maintenance signal “OFF” to the central monitoring device 1 (S123).

  As described above, in the air conditioning system according to the fifth modification, the life of the damper motor of the VAV unit 5 can be easily determined by the VAV controller 3 without taking in a separate signal from the VAV unit 5. Further, when it is determined that the damper motor has reached the end of its life, the VAV controller 3 can suppress the operation of the damper motor that has exceeded the end of life, and can increase the safety of the VAV unit 5.

  The present invention is not limited to the configuration of the embodiment described above, and various modifications can be made without departing from the spirit of the invention. For example, the VAV unit 3 transmits a failure signal to the central monitoring device 1 only when the VAV unit 5 is in a failure state, and does not transmit a state signal to the central monitoring device 1 when the VAV unit 5 is not in a failure state. May be. In the present invention, the configuration of the core unit 2 is not essential.

DESCRIPTION OF SYMBOLS 1 Central monitoring apparatus 3 VAV controller 31 Temperature detection part 32 Calculation part 33 Damper control part (damper control means)
34 Determination part (determination means)
35 Transmitter / receiver (acquisition means)
4 Setter 5 VAV Unit 51 Damper Motor 52 Damper Opening Detection Unit 53 Wind Speed Sensor 6 Air Conditioner 7 I / O
8 Bus 9 Duct S Air conditioning system

Claims (8)

In an air conditioning system comprising a central monitoring device, a VAV controller connected to the central monitoring device, and a VAV unit that is controlled by the VAV controller and variably controls the air volume to the conditioned space,
The VAV controller is
Damper control means for instructing opening / closing of a damper provided in the VAV unit based on an on / off signal received from the central monitoring device;
Obtaining means for obtaining control information necessary for controlling the VAV unit;
Determination means for determining the operating state of the VAV unit using the opening / closing command and the control information;
The control information, before Symbol damper height position signal detected by the damper opening detector provided in VAV unit, the damper open command time for Danpamota for driving a damper provided in front Symbol VAV unit, and during the time of the damper close command Is included,
The determination means includes
The damper motor is determined to be in failure when the difference calculated by the equation of damper open command time−damper close command time is equal to or greater than a predetermined time and the damper high opening signal is not detected. Air conditioning system. The determination means further transmits a damper open signal as the opening / closing command, and then when the wind speed signal acquired by the acquisition means from a wind speed sensor provided in the VAV unit is a predetermined value or less, or a damper closing signal as the opening / closing command. 2. The air conditioning system according to claim 1, wherein a damper failure of the VAV unit is determined when a wind speed signal acquired by the acquiring unit is equal to or greater than a predetermined value after transmitting the signal. The determination means further detects a damper high opening signal or a damper appropriate opening signal detected by a damper opening detector provided in the VAV unit after transmitting a damper opening signal as the opening / closing command, and When the wind speed signal is 0 or less, or after the damper close signal is transmitted as the opening / closing command, the damper high opening signal and the damper proper opening signal are not detected, and the wind speed signal is 0 or more The air conditioning system according to claim 1, wherein the wind speed sensor of the VAV unit is determined to be a failure. The determination means further includes:
When the difference calculated by the equation of damper closing command time−damper opening command time is equal to or longer than a certain time and the damper high opening signal or the damper appropriate opening signal is detected, the damper motor is determined to be faulty. The air conditioning system according to claim 1, wherein: The acquisition means further acquires, as the control information, a total number of control commands to the damper motor provided in the VAV unit from the damper control means per unit time,
2. The air conditioning system according to claim 1, wherein the determination unit determines that the maintenance time of the VAV unit is in a case where the total number of the control commands is a predetermined number or more. The acquisition means further acquires, as the control information, an integrated value of a damper open command time and a damper close command time from the damper control means per unit time to the damper motor provided in the VAV unit,
2. The air conditioning system according to claim 1, wherein the determination unit determines that it is time to replace the damper motor when the integrated value is equal to or longer than a predetermined time.   6. The damper control unit according to claim 5, wherein the damper control unit stops outputting a control command to the damper motor of the VAV unit for a predetermined time when the determination unit determines that the maintenance time or the replacement time is reached. Item 6. The air conditioning system according to item 6. The VAV controller is
A transmission means for transmitting the result of the determination to the central monitoring device;
The central monitoring device is
The air conditioning system according to any one of claims 1 to 7, further comprising display means for displaying the result of the determination on a screen.