KR100437347B1 - Fan operation controlling method for improving cooling efficiency in a small transmitter - Google Patents

Abstract

The present invention relates to a fan operation control method for improving the cooling efficiency of a small repeater, and more particularly to a fan operation control bomber for improving the cooling efficiency of a small repeater.

To this end, the present invention, the fan operation control method for improving the cooling efficiency of the small repeater of the present invention comprises: a first step of determining whether the speed is increased to the initial set value by allowing the fan to rotate at a low size over a certain time; A second step of increasing the serial count to check time for serial transmission when the fan speed is increased to an initial set value; Performing a serial transmission if the serial count value is determined to be transmittable; A fourth step of reading a current temperature value and setting a state of whether it can be processed according to the temperature; A fifth step of increasing a speed adjustment time for going to the operation of adjusting the speed of the fan according to the temperature value if the processing is possible; When the speed adjustment time is reached, the sixth step of executing a fan speed control after storing a new temperature value, and the seventh step of checking whether an error occurs during operation.

Description

Fan operation controlling method for improving cooling efficiency in a small transmitter

The present invention relates to a fan operation control method for improving the cooling efficiency of a small repeater, and more particularly, to adjust the rotation speed of the fan according to the internal temperature of the repeater, to accurately determine the cause of the error, and to open and close the door itself The present invention relates to a fan operation control method for improving the cooling efficiency of a small repeater for controlling the start and stop of the fan according to the situation.

In general, various electrical and electronic devices as well as communication systems are composed of a large number of electrical and electronic components, the temperature generated by the current flowing through each of these components continues to rise, so long-term operation of the electrical and electronic equipment to meet the temperature rise Each part generates an operating error because of the overcurrent.

Therefore, there is a fan for forcibly cooling the heat of the heat sink and the component to maximize the area of contact with the external cold air as a means of lowering the temperature of each electronic component in the electronic device.

The fan has a conventional RPM to simply turn on / off around the reference value at a predetermined RPM, which has a predetermined RPM depending on the state of the temperature, so that the fan cannot cope sufficiently in the summer when the outside air is hot. In order to solve the above problems, a method for controlling the cooling fan speed by the internal temperature of the rack (a method and a system for controlling a return air blower such as a Korean patent application No. 012161 exchanger and the like) has been devised. The method is as follows. Ambient temperature is sensed and the weak voltage change that changes according to the temperature change is amplified, and then the amplified voltage is converted into a temperature to detect the rotational speed level of the return air fan and the rotation. The rotation speed of the return fan is adjusted by supplying a control voltage proportional to the speed level, and the rotation speed is When lowered the alarm signal is generated; A control method in which an alarm signal is generated when the amount of air flow is reduced by checking the amount of air flowing only when the control voltage is maximum; a temperature sensor that senses temperature and changes a voltage according to a temperature change; and a slight voltage change of the temperature sensor OP AMP to provide a signal source for controlling the return fan by amplifying the; and a comparator for converting the amplified voltage to a temperature to detect the rotational speed level of the return fan; generating a control voltage of the drive unit connected to the rear end A voltage generator; Supply unit for supplying power for driving the ventilation fan; A ventilation fan fan that rotates in proportion to the supplied voltage, the waveform generator is built in proportion to the rotational speed; By calculating the rotational speed of the ventilation fan as a waveform Waveform detector for generating an alarm signal when the rotational speed of the return fan is lower than the set value; Air flow sensor for generating an alarm signal when the amount of air flowing into the ventilation fan is reduced; The voltage generated by the voltage generator is the maximum It is a control method consisting of an end-catch to determine the check time of the air volume sensor only. However, the above method simply amplifies the voltage generated by the temperature change by using the temperature sensor by the temperature change inside the rack. This is to control the rotation speed of the fan by converting the voltage into temperature. If the door is opened by being fan will continue to operate, if you want to repair a problem that could rack will need to turn off the fan itself.

The present invention is to solve the above problems, the objective of the present invention is not a simple operation of the repeater door, whether the opening and closing of the door, the fan speed increase time, the speed of the fan, the internal temperature, etc. To provide a fan operation control method for improving the cooling efficiency of the small repeater for cooling the.

1 is a view showing a schematic appearance of a small repeater according to the present invention.

Figure 2 is a schematic diagram of an embodiment for the fan operation control for improving the cooling efficiency of the small repeater according to the present invention.

3 is a diagram showing an example of the flags of FIG.

4 is a flowchart illustrating a process in the case where the repeater is powered on or reset.

5 is a flowchart when an interrupt is generated with an internal timer in a high state.

6 is a flowchart showing a process for controlling the operation of a fan.

7 is a flowchart showing a process of a self test routine.

8 is a flowchart for a serial communication service.

9 is a flowchart for explaining a routine of reading the current temperature.

10 is a flowchart for a routine for obtaining a waiting time.

11A and 11B are flowcharts for a routine for adjusting the fan speed.

12 is a flowchart showing a process of slowing down the fan speed.

13 is a flowchart showing a process for reducing the fan speed.

14 is a flowchart showing a process for increasing the fan speed.

15 is a flow chart for an error service routine.

16 is a flowchart showing a process for checking a fan error.

※ Explanation of code about main part of drawing ※

10 repeater 12 door 14 fan

16 CPU 18 interface unit 20 input / output device

22: memory 24: register 26: flag

The fan operation control method for improving the cooling efficiency of the small repeater of the ball invention for achieving the above object, the first step to determine whether the speed is increased to the initial set value by allowing the fan to rotate in a gradual size over a certain time; ; A second step of increasing the serial count to check time for serial transmission when the fan speed is increased to an initial set value; Performing a serial transmission if the serial count value is determined to be transmittable; A fourth step of reading a current temperature value and setting a state of whether it can be processed according to the temperature; A fifth step of increasing a speed adjustment time for going to the operation of adjusting the speed of the fan according to the temperature value if the processing is possible; The sixth step of executing the fan speed control after storing the new temperature value and the seventh step of checking whether the error occurs during the operation when the speed adjustment time is reached.

In the first step, if the fan speed does not increase to the initial set value, it is preferable to perform a self test routine for measuring whether the door is opened, the fan speed increase time, the fan speed, and the like.

In the second step, the transmission data during the serial transmission may include a read temperature value, whether the door is opened or closed, and current fan speed values.

In the sixth step, the adjustment of the fan speed may include: an eighth step of conducting an inspection to confirm whether the speed difference is in a standby state after storing the temperature difference position; A ninth step of increasing a standby count when the temperature is in a standby state and setting a low temperature flag to notify the sub-zero temperature when the read temperature is 0 ° C. or less when the temperature is not in the standby state; If it is not below zero temperature, it is determined whether the previously read temperature is below zero. If the previous temperature is below zero and the read temperature is the fan operating temperature, the low temperature flag is cleared and the fan is operated. If the previously read temperature is not below zero, the fan off temperature is And a tenth step of determining a holding temperature, storing a holding temperature difference, and executing a fan speed reduction routine; An eleventh step of storing the current temperature difference together with the holding temperature in the buffer when the holding temperature is exceeded and clearing all the variables by checking whether all the variables for the fan speed change are clear; And a twelfth step of terminating the service without changing the fan speed when the difference between the read temperature and the maintenance temperature is zero, and increasing the speed so as to change at a constant rate if there is a temperature difference. It is done.

In this case, the fan speed reduction routine may include: checking whether the fan speed is in the down mode and reducing the fan speed, determining whether the reduced speed and the desired deceleration speed are the same, and switching to the standby state; Storing the speed value to be decelerated in the buffer when the fan speed is not in the down mode, and setting the standby flag to apply the minimum value to clear the previously set change value and inform the standby state if the speed value is small compared with the minimum speed; And, if it is not less than the minimum speed may be set to the minimum speed and switch to the standby state.

In the sixth step, the increase in the fan speed during the fan speed adjustment includes: checking whether the fan speed increase mode is used to increase the fan speed, and determining whether the increased speed and the desired increase speed are the same; Storing the speed value to be increased in the buffer when the fan speed increase mode is not increased, applying a minimum value when the speed value is small compared with the maximum speed, and setting a standby flag to clear a previously determined change value and notify the standby state; If the maximum speed is not small, it is preferable to set the maximum speed and switch to the standby state.

In the seventh step, the error occurrence check may include: checking whether a fan is generated and clearing the alarm or executing the next command; If it is not an alarm for the fan, checking a tacho pulse and comparing whether it is a high section; When the taco pulse is a high section, increasing a timer for the taco pulse high section for a predetermined time and generating a fan alarm and outputting an alarm when the timer passes for a predetermined time; If the taco pulse is not a high interval, increasing a timer for a taco pulse low interval, and generating a fan alarm when the low interval timer elapses for a predetermined time; When the alarm occurs for the fan, if the alarm generation section is a high section, the previously generated alarm is cleared when the level of the input taco pulse is low, and when the level of the input taco pulse is high when it is generated in the low section It is desirable to have a step of clearing a previously generated alert.

Hereinafter, described in detail by the accompanying drawings as follows.

In the embodiment of the fan operation control method for improving the cooling efficiency of the small repeater according to the present invention, the operation of the fan 14 mounted on the door 12 of the small repeater 10 of FIG. It can be controlled by the controller.

That is, referring to FIG. 2, the input / output device 20 and the memory 22 are connected to the CPU 16 through the interface unit 18. The interface unit 18 is provided with a register 24 and a flag 26 and flags therein. The flags 26 for the present invention are described in detail in FIG. 3.

Referring to FIG. 3, the flag 26 includes a power_init flag 260, a process_run flag 262, a door_open flag 264, and a carry flag 266. , Sensor_Open flag 268, Sensor_Short flag 270, Minus_Temp flag 272, Wait flag 274 and High_Error flag 276. have. A detailed description thereof will be described with reference to the following detailed method of FIG. 4.

4 is a flowchart illustrating a process of a program when a power is supplied to or reset from the repeater 10.

First, the RAM, which is an internal memory 22, is initialized, and a fan off value is written to the output port to stop the operation of the fan 14. Then, the corresponding port is read to check the state of the internal register setting and the current door 12 for using other functions (S1).

After that, it is checked whether the current door 12 is opened (S2), and when it is opened, the alarm output is cleared, the fan 14 is turned off, and a flag is set to indicate the 'door open' state (S3). . If it is not opened, the alarm port is cleared and power is supplied to the fan 14 (S4).

Then, the alarm state is output, the interrupt is enabled (Enable) and all timers are set to be enabled (S5).

Next, referring to FIG. 5, a flowchart illustrating a case where an interrupt occurs when the internal timer is high.

At this time, the register is first moved to the stack (S6). Then, it is determined whether it is a reception interrupt (S7) or an interrupt at the transmission (S8). The count value is compared whether there is data to be transmitted (S9). At this time, if there is data to be transmitted, load new transmission data, decrease the serial count by 1, increase the data pointer by 1 to designate the position of the next transmission data, and write the newly loaded data to the serial buffer to New data is transmitted (S10). Finally, the register value, which was initially moved, is transferred from the stack to the register again (S11). This allows you to return to the state before the interrupt.

6 is a flow chart showing the main process of the program for actually controlling the operation of the fan. This example will be explained in parallel with the figures presented next.

First, when a program for controlling the operation of the fan 14 is started, in order to gradually increase the fan operation, the speed of the fan is increased at a constant time in the self-test routine L1 as shown in the example of FIG. When the power initialization flag 260 is set when it is possible to confirm that the speed has been increased to the initial set value (S15).

When step S15 is normally performed, the serial count is increased to check the time for serial transmission (S16). In contrast, when the normal operation is not performed, the self test routine L1 of FIG. 7 is executed.

The serial count is increased and the serial count value is compared to determine whether it is time to transmit (S17). If serial transmission is possible, the serial service routine L2 of FIG. 8 is executed. In this case, as in the example of Fig. 9, the routine L3 for reading the current temperature value is executed. At this time, the process run flag 262 is set to indicate that the processing according to the temperature is possible.

Next, it is determined whether the processing is possible according to the read temperature value (S18), if possible to obtain a time to go to the routine (see Figs. 11a and 11b) for adjusting the fan speed according to the temperature value. The interrupt count value is increased (S19). It is determined whether to go to the fan speed control routine by checking the interrupt count value (S20), and if so, stores the read new temperature value (S21). Then, the fan speed adjustment routine L4 is called.

At this time, the error service routine (L5) is called to determine whether the result is an error. After that, all programs are terminated and the interrupt service is terminated, and the state is returned to the standby state until the next timer interrupt is generated.

<Self test (L1)>

Then, the process of the self test routine L1 will be described with reference to FIG.

First, in this routine, the door opening flag 264 is checked to see if the door 12 is open (S25), and if the door 12 is open, the error service routine L5 of FIG. 15 is executed. Done. On the contrary, if the door is closed, the alarm output port is cleared, and the system outputs that it is operating normally, and the self-count value is increased so that a certain time can be checked to increase the speed (S26). As a result, the time is checked to increase the fan speed (S27) and the fan speed is increased (S28) or returned. At this time, the fan speed decreases by 1/256 steps, and the 'FAN_PWM' value at the maximum speed that increases the fan speed is 0, and at the minimum, it stops 255.

It is determined whether the initial speed is increased by increasing the fan speed while increasing the speed (S29). If this is satisfied, the power initialization flag 260 is set (S30). In order to actually apply the changed fan speed value, the fan speed is changed and applied by recording the changed value in the latch buffer (S31).

Serial Service (L2)

Referring to Figure 8 will be described the process for the serial communication service.

First, the transmission buffer is cleared and the read temperature value is stored (S35). At this time, it is checked whether the door 12 is opened (S36), and if not opened, the current fan speed value is recorded in the transmission buffer (S37). If it is open, it writes '255' to the transmission buffer instead of the fan speed value (Write) to indicate that the fan is not currently running (S38). The serial transmission is started by writing the byte value to be transmitted to the serial count buffer and recording the '0AAH' hexadecimal 'AA' value in the transmission buffer (S39).

<Reading Current Temperature (L3)>

Next, a routine of reading the current temperature will be described with reference to FIG.

First, to initialize the temperature to access the A / D converter to read the temperature (S45). That is, the clock port is cleared, the chip select is turned on, and the address input is set. Then, the waiting time routine L6, which will be mentioned later in FIG. 10, is executed to wait for a predetermined time and set the clock (S46). After the clock is cleared (S47), these are repeated once (S48 and S49), and the wait time for the next clock is waited for the next clock to indicate that the clock set address is finished (S50). The clock is cleared once again (S51), the loop count is set to wait for the waiting time, set the clock, and repeat the predetermined number of times (S52). Then, the clock is reset (S53), waits for a predetermined time, and then clocks, reads an external port value into the carry flag 266 and stores it. Thereafter, the loop count is decreased by one to count the number of times (S54).

When the loop count is checked, it is asked whether to continue (S55), and when it ends, the current temperature up to this point is stored (S56). At this time, it is checked whether the stored current temperature is smaller than the minimum value. This is to check whether the temperature sensor is defective. That is, judging whether it is smaller than the minimum temperature (S57), if it is determined that it is not small, it is cleared by the sensor open to indicate that the temperature sensor is normal (S58). (S59).

At this time, compared to the maximum temperature again (S60), if it is greater than the maximum temperature, it is set to the sensor short to indicate that the temperature sensor is an error (S61), otherwise cleared by the sensor short to indicate that the temperature sensor is normal (S62).

<Wait time routine (L6)>

10 introduces a routine L6 for obtaining a waiting time. This example is to determine the duty ratio to create a synchronous clock to read analog values that vary with temperature as digital values. First, the loop time is stored as a predetermined variable (S65), and the variable which is the stored value is first subtracted (S66). If the result is smaller than or equal to 0, the next command is executed (S67).

<Fan speed control (L4)>

11A and 11B show an example of a routine for adjusting the fan speed.

First, after storing the temperature difference position (S70), a check is performed to determine whether the speed change is in a standby state (S71). In the case of the temperature change standby state, the wait count is increased (S72) and the wait count is determined to be 4.2 or more (S73) to clear the wait flag 274 (S74). If the temperature change is not in the standby state, it is determined whether the read temperature is 0 ° C. or less (S75), and if it is below, the low temperature flag 272 is set to notify the sub-zero temperature and the fan is stopped (S76). Then, the currently set fan speed is written to the output buffer (S77).

If the temperature is not below zero, it is determined whether the previously read temperature is zero (S78). If the previous temperature is below zero and the read temperature is the fan operating temperature (S79), the low temperature flag 272 is cleared and the fan is operated ( S80). If the previously read temperature is not below zero, it is determined whether the temperature is less than the fan off temperature (S81), and whether the temperature is lower than the holding temperature (S82). Proceed with the fan speed reduction routine (L7).

If the holding temperature is exceeded, the current temperature difference is stored in the buffer together with the holding temperature (S84). At this time, it is checked whether all variables for the fan speed change are in a clear state (S85), and if not, clears all variables (S86).

If the read temperature is 0 and the difference from the maintenance temperature is 0 (S87), the service is terminated without changing the fan speed. Comparing whether the temperature difference is 1 (S88), in the case of 1 increases the rate of change, increases by 3/256 (S89). Comparing whether the temperature difference is 2 (S90), in the case of 2, the rate of change is increased by 5/256 (S91). If the temperature difference is 3, the rate of change is increased by 7/256 (S93). Otherwise, the rate of change is further increased by 9/256 (S94). This fan speed increasing routine L8 is shown in FIG.

According to the flow as described above it can be seen that the fan speed control is made differently according to various conditions.

<Fan speed deceleration routine (L7)>

12, the process of decelerating the fan speed will be described.

First, it is checked whether all the variables for the fan speed change are in the clear state (S100), and if not the clear state, all the variables used for the fan speed change are cleared (S101). Then, if the difference is 0 by comparing the temperature difference, the process is terminated. Otherwise, the fan speed is reduced by giving a different change speed according to the temperature difference (S103, S105, S107) as in the fan speed adjusting routine L4. . After performing such a process, the routine L8 substantially reduces the fan speed.

<Fan speed reduction routine (L8)>

13 shows the process for reducing the fan speed in detail. First, by checking the fan speed down mode (Sown Mode) (S110) in the case of the corresponding mode, reduce the fan speed (S111), determine whether the reduced speed and the desired deceleration speed is the same (S112) go to the standby state or exit I'm going.

If the fan speed is not in the down mode, the speed value to be decelerated is stored in the buffer (S113), and if the value is small compared with the minimum speed, the minimum value is applied, and the standby flag 274 is cleared to clear the predetermined change value and inform the standby state. Set and terminate the service. If not less than the minimum speed is set to the minimum speed (S115), and switch to the standby state (S116). This terminates the deceleration service, writes the changed fan speed and terminates this service routine.

<Fan speed increase routine (L8)>

In Fig. 14, a process for increasing the fan speed is shown. First, by checking whether the fan speed increase mode (S120), in the case of the corresponding mode, increase the fan speed (S121), determine whether the increased speed and the desired increase speed are the same (S122), or go out to the standby state.

If the fan speed increase mode is not increased, the speed value to increase speed is stored in the buffer (S123), and if the value is small compared with the maximum speed, the minimum value is applied, and the standby flag 274 is cleared to clear the predetermined change value and inform the standby state. Set and terminate the service. If not less than the maximum speed is set to the maximum speed (S125), and switch to the standby state (S126). This terminates the fan speed increasing service, writes the changed fan speed, and terminates this service routine.

<Error service (L5)>

Referring to Figure 15, a flow for an error service routine is shown. First, the current error state stored in the error registration buffer is read and stored (S130). If the door is opened in the current state of reading and the door is opened, the next command is considered to be an error due to the door being opened (S131). Checks whether a door error has occurred and if it has already occurred, excludes the next command (S132). The time is increased to check whether the door is opened by a predetermined time (S133). It checks whether the door has been opened for a predetermined time, and generates an error signal if the door is opened to exceed the time (S134). Then, the time check counter is cleared, the door alarm is set, and the fan is stopped (S135).

Run the following command to check if an error occurred due to the door being opened. If an error occurs at this time, the door error state will be high (S137). If the door is open, the fan error check routine L9 is executed. On the contrary, increase the time to check whether the door is closed by a certain time (S138), clear the error if the closed time exceeds the maximum time (S139), clear the time check counter, , Clear all alarms. Then, the power initialization flag 260 is cleared so that all operations start again from the beginning (S140).

When this process is completed, the alarm service is completed by returning the error service by writing to the port.

<Check Fan Failure (L9)>

Referring to Fig. 16, a process for checking a fan error is shown.

This is to check whether there is an abnormality of the fan to be controlled and to generate an alarm. First, it is determined whether to check or skip by comparing whether the initial operation is completed (S145). If an alarm occurs for the fan, check whether the alarm is normal or not, and execute the next command (S146). If a fan alarm does not occur, check whether the fan is in a stopped state, and if not, check if it is in operation (S147). At this time, the tacho pulse is checked to compare whether it is a high ("H") section (S148). In the case of the high section, the timer for the taco pulse high section is increased (S149), and it is determined whether the taco pulse high section timer has elapsed for a predetermined time (S150). At this time, if a predetermined time elapses, a fan alarm is generated (S151) and an alarm state is output (S152).

If the taco pulse is not a high section, it is determined whether a fan alarm has occurred (S153). When the alarm is not generated, the timer for the taco pulse low (“L”) section is increased (S154), and the fan section is generated by determining whether the low section timer has elapsed for a predetermined time (S155).

If an alarm occurs for the fan in step S146, it is determined whether the section in which the alarm is generated is high or low (S157). If high, if the level of the taco pulse is "L", the previously generated alarm is cleared (S158).

As described above, according to the embodiment of the present invention, an appropriate and accurate control operation is performed according to the state of various components for cooling the repeater, so that the temperature inside the repeater is properly maintained.

As described above, the present invention has the effect of gradually cooling the repeater gradually and accurately by comprehensively judging whether the repeater door is opened or closed, the fan speed increase time, the fan speed, the internal temperature, etc., rather than a simple fan operation. As described above, the present invention has been described in detail only with respect to the described embodiments, but it will be apparent to those skilled in the art that various changes and modifications are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims. It is natural.

Claims (7)

In the cooling method, the speed of fan can be adjusted by changing the temperature inside the rack. A first step of determining whether the speed is increased to an initial set value by allowing the fan to rotate at a gradual size over a predetermined time; A second step of increasing the serial count to check time for serial transmission when the fan speed is increased to an initial set value; Performing a serial transmission if the serial count value is determined to be transmittable; A fourth step of reading a current temperature value and setting a state of whether it can be processed according to the temperature; A fifth step of increasing a speed adjustment time for going to the operation of adjusting the speed of the fan according to the temperature value if the processing is possible; A sixth step of executing a fan speed control after storing a new temperature value when the speed control time comes; Fan operation control method for improving the cooling efficiency of the small repeater, characterized in that it comprises a seventh step of checking whether an error occurs during operation. The method of claim 1, In the first step, when the fan speed does not increase to the initial setting value, the cooling of the small repeater is performed by performing a self test routine that measures whether the door is opened, the fan speed increase time, the fan speed, and the like. Fan operation control method for improving efficiency. The method of claim 1, In the second step, the transmission data during serial transmission includes a read temperature value, whether the door is opened or closed, and the current fan speed value. The method of claim 1, In the sixth step, the adjustment of the fan speed, An eighth step of storing the temperature difference position and performing an inspection to confirm whether the speed change is in a standby state; A ninth step of increasing a standby count when the temperature is in the standby state and setting a low temperature flag to notify the sub-zero temperature when the temperature read is less than 0 ° C. when the temperature is not in the standby state; If it is not below zero temperature, it is determined whether the previously read temperature is below zero, and if the previous temperature is below zero and the read temperature is the fan operating temperature, the low temperature flag is cleared and the fan is operated, and the previously read temperature is not below zero. Determining a temperature and a holding temperature to store a holding temperature difference and to execute a fan speed reduction routine; An eleventh step of storing the current temperature difference together with the yen maintenance temperature in the buffer when the temperature is exceeded and checking whether all variables for the fan speed change are in a clear state and clearing all variables; And And a twelfth step of terminating the service without changing the fan speed when the difference between the read temperature and the holding temperature is 0, and increasing the speed so that the temperature is changed at a predetermined rate if there is a temperature difference. Fan operation control method for improving cooling efficiency of small repeater. The method of claim 4, wherein The fan speed reduction routine, Reducing the fan speed by checking whether the fan speed is in the down mode, and determining whether the reduced speed is equal to the desired deceleration speed, and switching to the standby state; Storing the speed value to be decelerated in the buffer when the fan speed is not in the down mode, and setting the standby flag to apply the minimum value to clear the previously set change value and inform the standby state if the speed value is small compared with the minimum speed; And, And setting a minimum speed and switching to a standby state when the speed is not smaller than the minimum speed. The method of claim 1, When the fan speed is adjusted, the increase in the fan speed is, Checking whether the fan speed is increased, increasing the fan speed, determining whether the increased speed is equal to the desired increase speed, and switching to the standby state; Storing the speed value to be increased in the buffer when the fan speed increase mode is not increased, applying a minimum value when the speed value is small compared with the maximum speed, and setting a standby flag to clear a previously determined change value and notify the standby state; And, If not less than the maximum speed fan operation control method for improving the cooling efficiency of the small repeater comprising the step of setting the maximum speed to the standby state. The method of claim 1, The error occurrence check, If the alarm occurs for the fan, checking whether it is normal and clearing the alarm or executing a different command; If it is not an alarm for the fan, checking a tacho pulse and comparing whether it is a high section; When the taco pulse is a high section, increasing a timer for the taco pulse high section for a predetermined time and generating a fan alarm and outputting an alarm when the timer passes for a predetermined time; If the taco pulse is not a high interval, increasing a timer for a taco pulse low interval, and generating a fan alarm when the low interval timer elapses for a predetermined time; When the alarm occurs for the fan, if the alarm generation section is a high section, the previously generated alarm is cleared when the level of the input taco pulse is low, and when the level of the input taco pulse is high when it is generated in the low section A method for controlling fan operation for improving the cooling efficiency of a small repeater comprising the step of clearing a previously generated alarm.