JPH1194418A - Fan control device - Google Patents

Abstract

(57) [Problem] To provide a control circuit capable of easily responding to a change in the number of fans without increasing the number of signal lines even if the number of fans increases, and performing rotation control individually for each fan. SOLUTION: A plurality of fans for cooling equipment 1-1 to 1-1.
n, a plurality of flip-flops FF are provided corresponding to the shift registers S
The control unit 2a supplies the shift data Din and sequentially sets the flip-flops FF. And
When the flip-flop is set, the receiving unit 2 receives the corresponding fan rotation pulse signal, fan rotation type signal, and the like.
To the fan 1-1 by the rotation decrease detecting means 2e.
1-n is detected, and a fan rotation switching flip-flop FF1 and a failure notification flip-flop FF2 are set. Further, a clock is counted until the data Din supplied from the control unit 2a reaches the reception unit 2, and the number of fans is automatically recognized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a fan used for cooling equipment, and more particularly to a device for detecting a failure (low rotation) of many / various types of fans, controlling the number of rotations of many fans, and the like. The present invention relates to a fan control device that can be used.

[0002]

2. Description of the Related Art Fans (hereinafter referred to as F) used for cooling equipment.
AN) includes the following various types, and a combination of these types. Controls FAN rotation / stop only by power supply. Outputs a rotation pulse signal when the fan is rotating. Outputs a rotation stop signal when the rotation of the fan stops. One that can switch the rotation speed by a rotation speed switching signal. The rotation speed changes according to the supplied power supply voltage. A fan with the function of automatically changing the number of revolutions according to the temperature of the fan itself.

[0003] In an electronic device or the like that requires high reliability, in order to prevent a failure due to a decrease in cooling capacity, a FAN of a type that outputs a rotation pulse signal is used, and the rotation speed is reduced from a steady rotation speed. (For example, 30% decrease), and appropriate measures (alarm notification, start of operation of alternative FAN, etc.) are often taken. Further, in an office environment, in order to reduce FAN noise due to excessive cooling at a normal temperature (approximately 28 ° C.), a type of FAN capable of switching the rotation speed described above is used, or the fan is rotated by the above power supply voltage. A method has been used in which an FAN of a type that changes in number is used, and when the device environment temperature is lower than 28 ° C., the rotation is switched to low-speed rotation, and when the temperature is 28 ° C. or higher, high-speed rotation is controlled.

Further, for the same purpose as described above, it has been practiced to use a fan of the above type, turn on / off the power of the fan, and reduce the number of operating fans at normal temperature to suppress noise. On the other hand, FANs also include small FANs for local cooling and large FANs for exhausting equipment, and these FANs have different steady-state rotation speeds. For this reason, when using FANs of various sizes, it is necessary to change the threshold value for detecting rotation decrease in accordance with the FAN.

FIG. 7 is a diagram showing a configuration of a conventional FAN control device. In the figure, reference numerals 101 to 11n denote FANs which output a rotation pulse signal, 12 denotes a connection board,
Reference numeral 3 denotes a system control board.
3 is equipped with a switch 131 and a processing device 132. The processing device 132 is composed of, for example, a one-chip microcomputer or the like, and as shown in the figure, a timer 13a, a counter 13b, a FAN rotation decrease detection control unit 13c, a comparator 13d, a threshold table 13
e, functioning as the FAN rotation speed control unit 133;

The FAN control device shown in FIG. 7 operates as follows. When the FANs 101 to 11n rotate, each FAN
Output rotation pulse signals # 01 to # 0n, and the rotation pulse signals are transmitted to the system control board 13 via the connection board 12. On the other hand, the system control board 13
First, the FAN rotation decrease detection control unit 13c clears the counter 13b with a clear signal and starts a timer with a trigger signal. Thus, the timer 13a enables the counter 13b to operate for a fixed time by the start / stop signal. Meanwhile, the rotation pulse signal from the FAN selected by the switch 131 is input to the clock input of the counter 13b, and the counter 13b counts the rotation pulse signal.

Further, a signal indicating the FAN number selected by the switch 131 and a FAN rotation control state is transmitted from the FAN rotation control unit 133 to the threshold value table 13e, and the threshold value corresponding to each FAN is output from the threshold value table 13e. Is read. The operation of the counter 13b is started /
When stopped by the stop signal, the comparator 13d compares the count value of the counter 13b with the threshold value read from the threshold value table 13e.

[0008] The output of the comparator 13d is input to the FAN rotation decrease detection control unit 13c, and the FAN rotation decrease detection control unit 1c.
When the count value of the counter 13b is smaller than the threshold value, the fan 3c determines that the fan rotation is abnormal, and sends a fan error signal of the corresponding number. The above processing is performed for all FANs 101 to 11
n is repeatedly performed to detect a rotation abnormality of the FAN. The FAN rotation control state is controlled by the environmental temperature or the like, and the FAN rotation control unit 133 sets the FA based on the environmental temperature or the like.
For example, switching of the N rotation speed is performed. The number of FANs is FA
The N configuration information is provided to the FAN rotation control unit 133.

[0009]

The above-mentioned conventional fan control device has the following problems. (1) When the number of FANs increases, the following problems occur. It is necessary to connect the number of rotation pulse signals to the system control board by the number of FANs, and the number of connector poles between the connection board and the system control board increases, resulting in an increase in cost. The size of the changer became large, putting pressure on the circuit space on the system control boat, which was disadvantageous for saving space. The number of rotation control signals increased, the number of connector poles between the connection board and the system control board increased, and costs increased. If the number of switching signals is large, the rotation can be controlled in fine units, which is advantageous for noise reduction. In addition, the air flow balance at the time of failure of the fan is controlled to reduce the cooling capacity so that the redundant F is small.
Although an AN can be realized, an FAN with high performance / cost has to be adopted due to the limitation of the number of connector poles / the number of ports of the microcomputer.

(2) When the required cooling capacity changes due to addition of an option or the like, the following problem occurs. The number of FANs and the type of FAN rotation speed are F
Since it is fixedly provided to the microcomputer or the like as the AN configuration information, it is not possible to easily add a FAN or change the FAN rotation speed type (for example, increase the performance of the FAN). For this reason, the maximum number of fans and a high-performance fan are installed from the beginning as a basic configuration of the device, resulting in an increase in cost. Even if a means for changing the FAN configuration information is provided,
A control circuit that can handle up to the maximum number of fans is required.
For this purpose, the circuit space and the number of connector poles must be secured, and the cost has increased.

Further, in a redundant FAN system,
When replacing a failed FAN, which FAN should be replaced was determined by checking the mounting position from the FAN number, which could cause a replacement mistake. In addition, when a fan of a low rotation speed type is mistakenly mounted, there is a disadvantage that it is not possible to detect that the required cooling capacity has been lowered until the rotation is detected to be low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and a first object of the present invention is to provide a system control board having a signal line which is provided even when the number of fans is increased. An object is to realize a low-cost control circuit that does not increase in number. A second object of the present invention is to make it possible to control the rotation of each FAN individually, thereby realizing low noise and low cost of the FAN. A third object of the present invention is to provide an FA
An object of the present invention is to automatically recognize a change in the number of N and respond to a change in the number of FAN due to a change in the device configuration.
A fourth object of the present invention is to automatically recognize a change in the FAN rotation speed type and respond to a change in the FAN rotation speed type due to a change in the apparatus configuration. A fifth object of the present invention is to enable a failure lamp to be turned on individually for each FAN, thereby preventing a failure in replacing a failed FAN.

[0013]

FIG. 1 is a diagram showing a basic configuration of the present invention. As shown in FIG.
The above problem is solved as follows. (1) A plurality of flip-flops FF are provided in correspondence with a plurality of fans 1-1 to 1-n for cooling equipment, and the flip-flops are serially connected to form a shift register SR. Further, when the flip-flop FF is set, a gate G1 for passing the rotation pulse signal of the corresponding fan is provided. Then, the shift data Din is supplied from the control unit 2a to the shift register SR, the flip-flops FF are sequentially set, and the receiving unit 2 receives the rotation pulse signal of each fan via the gate G1.

In the above configuration, fan number recognizing means 2b for receiving the output Dout of the shift register SR is provided.
The number of fans can be recognized by counting the number of clock pulses until the data Din supplied from the control unit 2a reaches the reception unit 2. Further, a failure detecting means 2c is provided, and a failure can be detected when the data supplied from the control unit 2a does not reach the receiving unit 2.

(2) A plurality of fans 1-1 for cooling the equipment
A plurality of flip-flops FF are provided corresponding to 1-n, and the flip-flops are serially connected to form a shift register SR. Then, when the flip-flop corresponding to the fan for switching the rotation speed is set, a rotation speed switching signal of the fan is transmitted from the set information generating means 2d, and the rotation speed switching signal is set in the rotation switching flip-flop FF1. Then, switch the rotation of the fan.

(3) A plurality of fans 1-1 for cooling the equipment
A plurality of flip-flops FF are provided corresponding to 1-n, and the flip-flops are serially connected to form a shift register SR. When a failed fan is detected and a flip-flop corresponding to the fan for which a failure notification is made is set, the set information generating means 2d
Sends a failure notification signal, sets the failure notification signal in the failure setting flip-flop FF2, and notifies the failure of the fan.

(4) A plurality of fans 1-1 for cooling the equipment
A plurality of flip-flops FF are provided corresponding to 1-n, and the flip-flops are serially connected to form a shift register SR. The flip-flop FF
Is set, a gate G1 for passing the rotation pulse signal of the corresponding fan is provided. And the control unit 2a
Supplies the shift data Din to the shift register SR, sequentially sets flip-flops FF,
The rotation pulse signal of each fan is received by the receiving unit 2 via 1, and the rotation reduction of the fan is detected by comparing the fan rotation signal with the threshold value 2 f by the rotation reduction detecting unit 2 e. Further, it recognizes the fan rotation type, and changes the threshold value 2f according to the fan rotation type.

(5) In the above (1) to (4), an option board 3 on which a part of a flip-flop constituting the shift register SR is mounted, a connector C2 for inserting and removing the option board, and an input side And a through circuit 4 whose output side is connected to a shift input and a shift output of a flip-flop constituting the shift register. When the option board 3 is inserted into the connector C2, the shift data input to the through circuit 4 is supplied to a shift register composed of a flip-flop on the option board 3, and the shift data on the option board 3 The output of the shift register is output from the through circuit 4, and when the option board 3 is removed, the shift data input to the through circuit 4 is output as it is.

[0019]

FIG. 2 is a diagram showing the overall configuration of a fan control device according to an embodiment of the present invention. In FIG.
FANs 1 to 11m are connected to individual control circuits 141 to 14m provided on the individual control circuit mounting board 14, respectively. Individual control circuit 14
Each of the shift registers 1 to 14m is provided with a shift register which shifts by a clock pulse sent from the system control board 13 as described later. According to the shift position of the shift register, information such as a FAN rotation pulse and a FAN type is stored in the system. Send it to the control board 13.

The system control board 13 includes the processing device 1
32 are mounted. The processing device 132 is, for example, a one-chip microcomputer or the like, as shown in FIG. 7 described above, and has a timer 13a, counter 13b, FAN rotation drop detection control unit 13c, Unit 13d, threshold table 13
e, shift control unit 13f, FAN type recognition unit 13g,
FAN number recognition unit 13h, shift data generation unit 13i,
It functions as a clock generator 13k and a setting pattern generator 13n.

In FIG. 2, a timer 13a and a counter 1
3b, FAN rotation decrease detection control unit 13c, comparator 13
d, the operation of the threshold value table 13e is the same as that shown in FIG. 7, and in the present embodiment, the following are provided in addition to those shown in FIG. Shift control unit FAN rotation decrease detection control unit 1 including a shift register, etc.
3c, FAN type recognition unit 13g, FAN number recognition unit 1
3h and the like are sequentially operated. FAN type recognition unit Each individual control circuit 1 controlled by the shift control unit 13f
FAN by GOUT signal sent from 41 to 14m
Recognize type. FAN Number Recognition Unit The number of FANs is controlled by the shift control unit 13f and is recognized by Dout sent from the individual control circuit mounting board 14.

The shift data generator generates shift data Din and sends it to the shift controller 13f and the individual control circuits 141 to 14n. Clock generator The clock pulse is supplied to the individual control circuit mounting board 14, the shift controller 13f, and the like. Set information generation unit Generates set information for setting flip-flops and the like provided in the individual control circuits 141 to 14m and the cyst control unit 13g to predetermined states. Setting pattern generation unit FAN provided from FAN rotation decrease detection control unit 13c
A setting pattern such as a fan speed is generated based on the failure information, the environmental temperature, and the like.

FIG. 3 shows an individual control circuit 14 in this embodiment.
It is a figure which shows the structure of 1-14m. Individual control circuit 141
14m are connected to the FANs 111 to 11m via a connector 14a having a FAN type setting function as shown in FIG.
The type of the connected FAN is set by opening or shorting the pins a-b and cd of a. Table 1 shows the correspondence between the open / short state of the pins ab and cd and the FAN type.

[0024]

[Table 1]

SRn denotes flip-flops FFn1 to FFn
n3 (hereinafter, flip-flop is abbreviated as FF), and is a 3-bit shift register. Din of the shift register SRn of the n-th individual control circuit has a shift register SRn-1 of the preceding individual control circuit. Dou
t is connected, and Dout of the shift register SRn is connected to Din of the shift register SRn + 1 of the next individual control circuit. Din given from the system control board 13 is input to the shift register SR1 of the first individual control circuit, and Dout of the shift register SRm of the last individual control circuit is a signal for recognizing the number of FANs. It is sent to the system control board 13.

That is, each shift register of the individual control circuit is serially connected to form [the number of individual control circuits] × [3-bit shift register] as a whole, and shift operation is performed by a shift pulse. Then, the first bit (FFn1) of the shift register SRn of the individual control circuit is set to "
FT indicating FAN type 0 by setting "H"
The gate G1 of the YPE0 signal is opened and the gate G2 is opened, so that the rotation speed switching FF can be set. Also, “H” is set in the second bit (FFn2) of the shift register SRn.
Is set, FTYP indicating FAN type 1 is set.
The gate G3 for the E1 signal is opened and the gate G4 is opened, so that the fault lamp lighting FF can be set.

Further, by setting "H" to the third bit (FFn3) of the shift register SRn, the FAN
The gate G5 of the rotation pulse signal opens. The rotation speed switching FF is set according to the state of the SET signal sent from the system control board 13 when "H" is set in the first bit of the shift register SRn. Also,
The fault lamp lighting FF is set according to the state of the SET signal sent from the system control board 13 when "H" is set in the second bit (FFn2) of the shift register SRn.

FIGS. 4 and 5 are time charts showing the operation of the present embodiment. FIG. 4 shows FFn1 to FF of the individual control circuit.
The output of n3 is shown (FF11 to FF13 are FFs of the first individual control circuit in the serially connected individual control circuits, and FF21 to FF23 are F of the next individual control circuit.
F), and FIG. 5 is a diagram illustrating each signal on the system control board and the rotation speed switching FFn in the individual control circuit.
A, the operation of the fault lamp lighting FFnB. In FIGS. 4 and 5, the width of the third clock pulse CLK and the operation time of the FF13 and FF23 are changed to the width of the other clock CLK and the operation time of the FF in order to make the description of the FAN rotation pulse counting operation easy to understand. Although the expression is longer than the width, the width / period of the clock pulse CLK and the operation time of the FF may be the same.

Hereinafter, the operation of the FAN control apparatus according to the present embodiment will be described with reference to FIGS. (1) Clearing all shift registers of the individual control circuit After turning on the system power, the shift data generating unit 13i of the system control board 13 sets the Din signal to L and sets the clock pulse CLK of [the upper limit of the number of mountable FANs x 3].
Is supplied to the individual control circuit mounting board 14 to clear the shift registers SRn of the individual control circuits 141 to 14n.

(2) Recognition of the number of FANs Clock pulse C of [more than the upper limit of the number of FANs that can be mounted × 3] by setting Din to “H” only during the first clock.
LK is supplied to the individual control circuit mounting board 14. When the shift register of each individual control circuit sequentially shifts and Dout is output from the individual control circuit mounting board 14, the FAN number recognizing unit 13h of the system control board 13 sets the Dout to "H" at what clock pulse. Depending on
Recognize the N number. For example, Dou on the 3 × m clock
When t becomes "H", it is understood that the number of mounted individual control circuits (the number of FANs) is m. Also, even if the transmission of the clock pulse CLK is completed, Dout remains at "
If not "H", it is determined that the circuit is faulty.

(3) Recognition of FAN type and detection of decrease in FAN rotation When Din is set to "H" during the first clock and a clock pulse is supplied to the individual control board 141, as shown in FIGS. Circuit shift register SR
FF11 to FF13 and FF21 to FF23 are sequentially “
The first clock pulse is supplied to the individual control circuit, and when the output of the FF 11 goes to the "H" level, the gate G1 opens (the gate G2 opens at the same time, which will be described later), and the FTYPE0 signal Is Gout
Is sent to the system control board 13 and input to the FAN type recognition unit 13g.

The pin a- of the connector 14a of the individual control circuit
When b is short-circuited (in the case of the FAN rotation type 1), FTYPE0 is at "H" level as shown in Table 1 above. When the FAN rotation type is not 1 or when the FAN is not mounted, the pins ab are open and FTYPE0 is at the “L” level.
The FAN type recognition unit 13g outputs the FTYPE0 signal as "
H ”, it is recognized as FAN rotation type 1. Similarly,
When the second clock pulse is supplied and the output of the FF 12 becomes "H" level, the gate G3 opens (gate G4).
Also open at the same time, which will be described later), FTYP
The E1 signal is sent from the Gout to the system control board 13 and input to the FAN type recognition unit 13g.

The pin c- of the connector 14a of the individual control circuit
When d is short-circuited (in the case of the FAN rotation type 2), FTYPE1 is at the "H" level as shown in Table 1 above, and when the FAN rotation type is not 2 or when the FAN is not mounted. In this case, the pins cd are open, and FTYPE1 is at the “L” level.
The FAN type recognition unit 13g outputs the FTYPE1 signal as "
H ”, it is recognized as FAN rotation type 1.
When both TYPE0 and FTYPE1 are at “L” level,
It recognizes that FAN is not installed.

When the third clock pulse is supplied to the individual control circuit, the FF 13 of the shift register SRn becomes "
The gate G5 opens to output the rotation pulse from the Gout. At the same time as the output of the third clock pulse, the FAN rotation reduction detecting circuit of the system control board 13 first clears the counter 13b by the clear signal. After that, the timer 13a is activated by a trigger signal, and the timer 13a enables the counter 13b to operate for a fixed time by a start / stop signal.

In the meantime, a rotation pulse signal is input from the Gout to the clock input of the counter 13b, and the counter 13b counts the rotation pulse signal as shown in FIG. The FAN type recognized by the FAN type recognition unit 13g is input to the threshold table 13e, and a threshold corresponding to the FAN type is read from the threshold table 13e. When the operation of the counter 13b is stopped by the start / stop signal, the count value of the counter 13b and the threshold value table 1 are output by the comparator 13d.
The threshold values read from 3e are compared.

The output of the comparator 13d is input to the fan rotation reduction detection control unit 13c, and the fan rotation reduction detection control unit 1c
When the count value of the counter 13b is smaller than the threshold value, the fan 3c determines that the fan rotation is abnormal, and sends a fan error signal of the corresponding number. When the next fourth to sixth clock pulses are supplied, the outputs of the FFs 21 to 23 sequentially become "H" level as described above, and the FAN type is recognized by the Gout signal sent from the next individual control circuit. A rotation pulse is counted. The same procedure is repeated until the Dout signal becomes “H”, and the FANs of the m FANs are repeated.
Performs type recognition and rotation reduction detection. If no FAN is installed in the individual control circuit, the detection of the FAN rotation decrease is skipped.

(4) Setting of the rotation control FF and the failure lamp lighting FF When the first FAN rotation control is performed, the first clock pulse is supplied to the individual control circuit as shown in FIG. Give a SET signal. With this, SET
The state of the signal is set in the rotation control FFnA of the individual control circuit. To turn on the failure lamp of the first fan, the second clock pulse is supplied to the individual control circuit as shown in FIG.
As a result, "L" is set to the failure lamp lighting FFnB of the first FAN, and the light emitting diode LED1 is lit. The rotation control FF and the failure lamp lighting FF of the other individual control circuits are set. The set can be set in the same manner as described above.

In the embodiment described above, the controllable FA
The number N is determined by the number of individual control circuits on the individual control circuit board, and cannot control more fans than the number of individual control circuits. An embodiment in which a change (change in the number of fans) can be easily handled will be described.

FIG. 6 shows an embodiment in which an option board and a through circuit are provided in order to easily cope with a configuration change of the apparatus. In the figure, reference numeral 14 denotes a boat equipped with an individual control circuit,
As described above, the clock pulse CLK, the SET signal, and Din are supplied from the system control board 13, and the Gout signal and the Dout signal are transmitted from the individual control circuit mounting board 14 to the system control board 13. The individual control circuit mounting board 14 has an individual control circuit 141 provided with a shift register group SR1, a through circuit 15, and an individual control circuit 142 provided with a shift register group SR3. It is composed of a circuit Not, AND gates G6 and G7, and an OR gate G8.

Reference numeral 17 denotes a connector, 16 denotes an option board, and the option board 16 includes a shift register group S
An individual control circuit 14op including R2 is mounted. In the figure, when the option board 16 is mounted, the input side of the NOT circuit NOT is grounded.
The output of the NOT circuit NOT changes to "H" level, thereby closing the gate G7 and closing the gate G7.
6 opens. Therefore, the output Dout of the shift register group SR1 of the individual control circuit 141 is supplied to the shift register group SR2 of the option board 16 via the connector 17.
The Dout of the shift register group SR2 of the option board 16 is connected to the Di of the shift register group SR2 of the individual control circuit 142 via the connector 17.
n.

Therefore, the individual control circuit 14op mounted on the option board 16 operates as described with reference to FIGS. 2 and 3, and the FA connected to the individual control circuit 14op.
Recognition of the N FAN type and a decrease in rotation are detected. When the option board 16 is not connected,
The input terminal of the NOT circuit NOT becomes "H" level, the gate G7 opens, and the gate G6 closes. Therefore, Dout of the shift register group SR1 of the individual control circuit 141 is connected to Din of the shift register group SR2 of the individual control circuit 142 via the gates G7 and G8.

That is, when the option board 16 is not mounted, the Dout of the shift register group SR1 is supplied directly to the Din of the shift register group SR2 through the through circuit 15. By appropriately providing the through circuit 15 on the individual control circuit mounting board 14, it is possible to easily cope with a change in the number of fans. That is, if the number of FANs increases, the option boards 16 are added, and if the number of FANs decreases, the option boards can be removed to easily cope with a configuration change.

[0043]

As described above, in the present invention,
The following effects can be obtained. (1) A plurality of flip-flops are provided in correspondence with a plurality of fans for cooling equipment, the flip-flops are serially connected to form a shift register, shift data is supplied to the shift register, and the flip-flops are sequentially set. When the flip-flop is set, a rotation pulse signal of the corresponding fan, a fan rotation type signal, and the like are transmitted to the receiving unit, and a fan rotation switching signal and a failure notification signal are transmitted. Even if the number increases, the number of signal lines entering the system control board does not increase, and a control circuit can be realized at low cost. In addition, the number of fans can be automatically recognized by counting the number of clock pulses until the data supplied from the control unit reaches the receiving unit, so that the number of fans can be changed by changing the device configuration. It becomes possible.

(2) Since the number of rotations can be switched individually for each fan, low noise and low cost fan can be realized. (3) Since the rotation type of the fan can be automatically recognized, it is possible to cope with a change in the rotation type of the fan due to a change in the device configuration.

(4) When a failed fan is detected, a failure notification signal is sent to notify the failure of the fan. Therefore, the failure lamp can be turned on for each fan, and the fan can be replaced. Mistakes can be prevented. (5) An option board on which a part of the flip-flop constituting the shift register is mounted, a connector for inserting and removing the option board, and a shift input and a shift of the flip-flop whose input side and output side constitute the shift register By providing a through circuit connected to the output, it is possible to easily cope with a change in the number of fans.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention.

FIG. 2 is a diagram illustrating an overall configuration of a FAN control device according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of an individual control circuit according to the embodiment of the present invention.

FIG. 4 is a time chart showing the operation of the embodiment of the present invention.

FIG. 5 is a time chart (continuation) showing the operation of the embodiment of the present invention.

FIG. 6 is a diagram showing an embodiment in which an option board and a through circuit are provided.

FIG. 7 is a diagram showing a conventional example.

[Explanation of symbols]

1-1 to 1-n fan 2 reception unit 2a control unit 2b fan number recognition unit 2c failure detection unit 2d set information generation unit 2e rotation decrease detection unit 2f threshold 2g fan rotation type recognition unit 3 option board 4 through circuit 111 to 11m Fan 13 System control board 132 Processing unit 13a Timer 13b Counter 13c FAN rotation decrease detection control unit 13d Comparator 13e Threshold table 13f Shift control unit 13g FAN type recognition unit 13h FAN number recognition unit 13i Shift data generation unit 13k Clock generation unit 13m Setting Pattern generation unit 14 Individual control circuit mounting board 14 14a Connector 141 to 14m Individual control circuit 15 Through circuit 16 Option board SRn Shift register FFn1 to FFn3 Flip-flop G1 to G5 Gate FFnA Rotation speed switching flip-flop FFnB Fault lamp lighting flip-flop

Claims (5)

[Claims] 1. A plurality of fans for cooling equipment, a shift register in which a plurality of flip-flops provided corresponding to each of the fans are serially connected, and when the flip-flop is set, rotation of the corresponding fan A gate that passes a pulse signal; a control unit that supplies shift data to a shift register including the flip-flop and sequentially sets the flip-flop; and a reception unit that receives a fan rotation pulse signal output by the gate. A fan control device comprising: 2. A plurality of fans capable of switching the number of rotations for cooling equipment, a shift register serially connecting a plurality of flip-flops provided corresponding to each fan, and a shift register including the flip-flops And a control unit for supplying the shift data to the flip-flop and sequentially setting the flip-flop; and a set information generating means for transmitting a rotation speed switching signal of the fan when the flip-flop corresponding to the fan for switching the rotation speed is set. And a rotation switching flip-flop which sets a rotation number switching signal output from the set information generating means and outputs a rotation switching signal to the fan. 3. A plurality of fans for cooling equipment, a shift register serially connecting a plurality of flip-flops provided corresponding to each of the fans, and shift data supplied to a shift register including the flip-flops. And a control unit for sequentially setting the flip-flop, and when a failed fan is detected, when a flip-flop corresponding to the fan for which a failure is notified is set,
A fan control device comprising: a set information generating unit that transmits a failure notification signal; and a failure setting flip-flop that sets a failure notification signal output by the set information generation unit and notifies a failure of the fan. . 4. A plurality of fans for cooling equipment, a shift register serially connecting a plurality of flip-flops provided corresponding to each of the fans, and rotation of the corresponding fan when the flip-flop is set. A gate that passes a pulse signal; a control unit that supplies shift data to a shift register including the flip-flop and sequentially sets the flip-flop; and a reception unit that receives a fan rotation pulse signal output by the gate. A fan rotation decrease detection unit that detects a decrease in the rotation of the fan by comparing the fan rotation signal received by the reception unit with a threshold value; a fan rotation type recognition unit that recognizes a fan rotation type; Means for changing a threshold value. 5. An option board on which a part of a flip-flop constituting a shift register is mounted, a connector for inserting and removing the option board, and a shift input of the flip-flop whose input side and output side constitute the shift register. And a through circuit connected to a shift output. The through circuit shifts shift data input to the through circuit when the option board is inserted into a connector, and includes a flip-flop on the option board. 2. The output of the shift register on the option board is output from a through circuit while being supplied to a register, and when the option board is removed, shift data input to the through circuit is output as it is. , 2, 3 or the fan system of claim 4 Apparatus.