JP4659478B2 - Frozen showcase - Google Patents

Description

  The present invention relates to a refrigerated showcase in which an air curtain is formed in an opening of a product storage unit that stores frozen products, and more particularly to a technique for operation control when an abnormality such as a power failure occurs.

  Conventionally, as this type of refrigerated showcase, a substantially box-shaped and heat-insulating showcase body with an open top surface, an inner box with an open top surface formed inside the showcase body, and a lower side of the showcase body The thing provided with the machine room provided is known (refer patent document 1). The inner box is disposed with a predetermined gap from the showcase body, and the gap serves as an air passage through which cool air passes. An evaporator and a blower that form a refrigeration cycle are arranged in the ventilation path. The cool air cooled by the evaporator flows through the ventilation path by the blower and is discharged from a discharge port formed on one side of the upper part of the showcase body. Further, a suction port communicating with the ventilation path is formed on the other side of the upper part of the showcase body. Thereby, an air curtain is formed on the upper surface of the showcase body. A heater for removing frost adhering to the evaporator is installed in the vicinity of the evaporator. Cooling devices such as a compressor and a condenser that form a refrigeration cycle, a blower that cools the condenser, a control device, and the like are installed in the machine room.

An AC power supply is supplied to the refrigeration showcase, and some devices such as a heater and a compressor operate by AC. In addition, the refrigerated showcase is provided with a power supply circuit that converts an alternating current power source into a direct current, and devices such as a control device operate with the direct current supplied from the power source circuit.
JP 200445018 A

  By the way, in a store installed in a refrigerated showcase, a power supply system supplied to the refrigerated showcase and a power supply system supplied to, for example, lighting in the store are often separated. For this reason, even when a power failure occurs in the power supply system supplied to the refrigerated showcase, there are cases where power supply is maintained for store lighting and the like. In this case, the store clerk may be left without noticing the interruption of the power supply to the freezer showcase, which may lead to product deterioration.

    The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerated showcase capable of appropriate operation even when an abnormality such as a power failure occurs.

In order to achieve the above object, in the present invention , a refrigeration showcase comprising a power supply device that converts alternating current power into direct current and a control device that operates by direct current supplied from the power supply device, and includes a backup battery. The control device monitors power supply to the control device by the power supply device and detects a power supply abnormality, and power supply monitoring means for supplying a direct current from the backup battery to the control circuit, and at least the power supply monitoring means has a power supply abnormality In the present invention, there is provided an alarm means for storing the power supply abnormality in a predetermined history storage means and generating an alarm from a predetermined output device.

According to the present invention, when an abnormality occurs in the power supply, power is supplied from the backup battery to the control device, and a warning of power supply abnormality is issued from the predetermined output device by the alarm means. As a result, the store clerk and the like can recognize the occurrence of the power supply abnormality, so that appropriate measures can be taken. In addition, as a method of issuing an alarm, there are a method of appealing to the hearing such as emitting a predetermined alarm sound or a warning message from a speaker, a method of visually appealing such as lighting or blinking an LED or a lamp, or a method combining these. Can be mentioned. Further, the power supply monitoring means may detect an abnormal supply of alternating current to the power supply apparatus as proposed in claim 7 , or the direct current of the power supply apparatus as proposed in claim 8 . A supply abnormality may be detected, or both AC and DC supply abnormalities may be detected.

Further, in claim 1, and a fan motor for driving a cooling fan installed in the machine room, and a rotational speed monitoring means for monitoring the rotational speed of the fan motor, said alarm means, rotational speed monitoring means fan motor When the rotation speed abnormality is detected, (a) the fan motor is stopped for a predetermined time and then restarted. (B) If the rotation speed abnormality of the fan motor continues even after the restart, the rotation speed abnormality is detected. Is stored in the history storage means, an alarm is issued, and (c) the process (a) and the process (b) are repeated.

  There may be various reasons for the occurrence of fan motor rotation speed abnormalities, but in the case of minor foreign matter or mischief, the normal operation may be started by stopping or restarting the fan motor. is there. In the present invention, at the time of detecting an abnormality in the rotational speed of the fan motor, the fan motor is stopped and restarted, and an alarm is issued only when the abnormality detection is still continued. As a result, abnormalities that can be dealt with by stopping and restarting the fan motor can be resolved without bothering humans, and an alarm is not excessively issued, which is preferable in operation.

Further, in claim 2, in the freezing showcase according to claim 1, wherein said alarm means includes rotational speed monitoring means when the power supply monitoring means detects returning from a power supply abnormality detecting the rotational speed abnormality of the fan motor And when the power supply monitoring means detects the rotation speed abnormality and records the history when the power supply abnormality is detected, the history storage means stores the rotation speed abnormality when the power supply is restored. We propose a feature that does not memorize and issue warnings.

  According to the present invention, when an abnormality in the rotation speed of the fan motor is detected and an alarm is issued, a power supply abnormality such as a power failure occurs, and when the power supply is restored, the abnormality in the rotation speed is detected. No alarm is issued for the abnormal rotation speed. In such a case, an alarm is issued before the power supply is abnormal for an abnormality in the rotation speed of the fan motor.Therefore, an alarm for the abnormality in the rotation speed is not required after the power supply is restored. Therefore, it is preferable for operation.

According to a third aspect of the present invention, the apparatus includes temperature detection means for detecting the temperature of the product storage, and the alarm means detects the internal temperature and the reference temperature when the internal temperature detected by the temperature detection means is equal to or higher than a predetermined reference temperature. The process of integrating the difference with time is started, and when the integrated value becomes equal to or greater than a predetermined value, the internal temperature abnormality is stored in the history storage means and an alarm is issued. Propose.

  According to the present invention, an alarm is issued not only when the internal temperature becomes equal to or higher than the reference temperature, but also when the integrated value of the difference between the internal temperature and the reference temperature becomes equal to or higher than a predetermined value thereafter. The alarm is not issued when the internal temperature is temporarily raised and there is no effect on the product deterioration. That is, the alarm is not excessively issued, which is preferable for operation.

According to a fourth aspect of the present invention, a timer for measuring the current time is provided, and the alarm means detects that the output date / time of the timer has not changed for a predetermined period or that the output date / time of the timer is abnormal. In such a case, it is proposed that the timer abnormality is stored in the history storage means and an alarm is issued.

  If an abnormality occurs in the timer, the output date does not change or an abnormality occurs in the output date. In the present invention, such a timer abnormality is detected and an alarm is issued, so that it is possible to prevent various troubles due to the timer abnormality, for example, the notification that the defrosting time is approaching.

Further, according to claim 5 , in the refrigeration showcase according to claim 4 , further comprising a heater for defrosting frost adhering to the cooler, the control device at a predetermined time interval based on the time and date of the timer. The defrosting operation is performed by turning on the heater and performing a defrosting operation at a predetermined counter interval by starting a counting process when the alarm means detects a timer abnormality. We propose what

  According to the present invention, when the abnormality of the timer is detected, the defrosting operation interval is switched from the time measurement by the timer to the time measurement by the counter process, so that the regular defrosting operation can be continued.

Further, in claim 6 , in the refrigeration showcase according to claim 5 , a defrosting stop button for stopping the defrosting operation is provided, and the defrosting control unit detects pressing of the defrosting stop button during the defrosting operation. The thing characterized by stopping a defrost operation is proposed.

  According to the present invention, the defrosting operation is started when unnecessary defrosting operation is started due to an erroneous operation or when the amount of frost is small and the defrosting treatment is not necessary although the periodic defrosting operation is started. Since it can be stopped arbitrarily, it becomes highly convenient.

Also, the alarm and the claim 9, in the freezing showcase of claims 1 to 8 to any one of claims, including an alarm stop button for stopping the alarm, said alarm means detects the depression of the alarm stop button during alarm issued We propose what is characterized by stopping.

  According to the present invention, even if an alarm is issued by the alarm means, the alarm can be stopped by pressing the alarm stop button, which is highly convenient.

  As described above, according to the present invention, when a power supply abnormality, a fan motor rotation abnormality, or an internal temperature abnormality occurs, an alarm of the abnormality is issued from a predetermined output device by the alarm means. As a result, the store clerk and the like can recognize the occurrence of power supply abnormality and the like, so that appropriate measures are possible.

  A frozen showcase according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a frozen showcase, and FIG. 2 is a cross-sectional view of the frozen showcase.

  As shown in FIGS. 1 and 2, the refrigerated showcase 1 includes an outer box 10 having a heat insulating top opening, an inner box 11 disposed inside the outer box 10 at a predetermined interval, And a machine room 20 provided below the box 10. In the frozen showcase 1 according to the present embodiment, the inner side of the inner box 11 serves as a product storage 12 for storing frozen products such as ice cream.

  A gap between the outer box 10 and the inner box 11 forms a ventilation path 13 through which cool air flows. The upper end of the outer box 10 protrudes inward so as to contact the upper end of the inner box 11. A discharge port 14 for discharging cool air from the ventilation path 13 is formed at the upper part of one side wall of the inner box 11, and an intake port 15 for sucking outside air into the ventilation path 13 is formed at the upper part of the other side wall. Has been. An evaporator 16 that forms a refrigeration cycle and an internal fan 17 that blows air cooled by the evaporator 16 are installed in the ventilation path 13. With such a structure, cool air from the evaporator 16 is discharged from the discharge port 14 by the internal fan 17. This cold air is kept cooled in the product storage 12 and is sucked into the ventilation path 13 from the suction port 15. That is, an air curtain is formed on the upper surface of the commodity storage 12. Thereby, the inside of the product storage 12 can be efficiently cooled and maintained. A heater 18 for heating frost attached to the evaporator 16 is installed in the vicinity of the evaporator 16.

  In the machine room 20, devices such as a compressor 21 and a condenser 22 that form a refrigeration cycle, a machine room blower 23 that mainly cools the condenser 22, and a control device 50 described later are installed. One side wall of the machine room 20 is a detachable panel 20a, and an outside air inlet 24 is formed in the panel 20a. A waste heat port 25 is formed in the other side wall of the machine room 20. Further, an air filter 26 for filtering dust contained in the outside air is detachably provided in the vicinity of the outside air inlet 24. The air filter 26 can be easily detached by removing the panel 20a.

  On the outer wall of the outer box 10, a display unit 30 for notifying various information to a store clerk is formed. FIG. 3 shows a front view of the display unit 30. As shown in the figure, the display unit 30 has an internal temperature display LED 31 composed of several 7-segment LEDs for displaying the internal temperature, a filter cleaning sign LED 32 for urging the air filter 25 to be cleaned, a store clerk, and the like. And a first alarm LED 33 for notifying the occurrence of an abnormality.

  The machine room 20 is provided with an operation unit 40 for a store clerk or a maintenance company to operate the refrigerated showcase 1. The operation unit 40 is provided at a position where it can be operated when the panel 20a is removed. FIG. 4 shows a front view of the operation unit 40. As shown in the figure, the operation unit 40 includes an information display LED 41 composed of several digits of 7-segment LEDs for displaying various information such as an error code and a time until the next defrosting, and an abnormality etc. The second alarm LED 42 and the buzzer 43 to notify, the defrosting LED 44 indicating that defrosting is in progress, the buzzer stop button 45 for stopping the alarm sound by the buzzer 43, and the defrost stop button 46 for stopping the defrosting operation. And.

  Next, a control system of the refrigerated showcase 1 according to the present embodiment will be described with reference to FIG. FIG. 5 is a control block diagram of the freezer showcase.

  As shown in FIG. 5, the refrigerated showcase 1 operates by supplying a 200V AC commercial power supply. The refrigerated showcase 1 includes a switching power supply device 60 that converts alternating current into direct current, and the control device 50 is driven by a direct current supplied from the switching power supply device 60. Furthermore, the refrigerated showcase 1 includes a power supply monitoring device 70 and a backup battery 80 for monitoring a power supply abnormality.

  The power supply monitoring device 70 includes an AC power supply monitoring unit 71 that detects an abnormality in the AC supplied to the refrigerated showcase 1 and a DC power supply monitoring unit 72 that detects an abnormality in the DC supplied from the switching power supply 60. Yes. When the power supply monitoring device 70 detects an abnormality in the AC power supply or the DC power supply, the power supply monitoring device 70 supplies a direct current from the backup battery 80 to the control device 50 and notifies the power supply abnormality. Each of the monitoring units 71 and 72 detects a power supply abnormality when the AC or DC supply is interrupted or when the monitoring unit 71 or 72 deviates from a predetermined voltage range.

  The control device 50 includes a main control unit 90 that performs normal control such as cooling control and defrosting processing in the commodity storage 12, and an abnormality monitoring unit 100 that performs abnormality monitoring.

  The main control unit 90 includes an in-compartment temperature control unit 91 that performs cooling control in the commodity storage 12, a defrosting processing unit 92 that performs a defrosting process, and a timer 93 that measures the current date and time.

  The internal temperature controller 91 drives and controls the fan motor 17a and the compressor 21 of the internal fan 17 so that the temperature detected by the internal temperature sensor 19 provided in the commodity storage 12 is within a predetermined temperature range. To do.

  The defrosting processing unit 92 periodically drives and controls the heater 18 in order to remove frost attached to the evaporator 16. Further, the defrosting processing unit 92 operates in cooperation with the internal temperature control unit 91 so as not to perform the cooling operation during the defrosting processing.

  The defrosting processing unit 92 turns on the heater 18 for a predetermined time when the output date of the timer 93 reaches a predetermined set time. Therefore, the defrosting process part 92 cannot start a defrosting process at an appropriate timing, when the timer 93 is not driving normally. Therefore, when the abnormality monitoring unit 100 detects an operation abnormality of the timer 93 as described later, the defrosting processing unit 92 starts the counter processing and performs the defrosting processing when the counter value exceeds a predetermined reference value. To start. Here, the counter process is a process of sequentially increasing the numerical value stored in an appropriate storage area. The increasing speed of the counter is determined by the calculation speed (clock speed) of the main control unit 90. The predetermined reference value may be calculated in advance based on the counter increase speed and the defrosting processing interval time when the timer 93 is used. Further, the time for turning on the heater 18 may be measured by the counter process.

  Moreover, the defrosting process part 92 will light the LED44 during defrosting of the operation part 40, if a defrosting process is started. Furthermore, the defrosting process part 92 stops a defrosting process, if pressing of the defrost stop button 46 of the operation part 40 is detected. When the defrosting process by the defrosting process unit 92 is completed, the main control unit 90 starts the cooling operation by the internal temperature control unit 91.

  The abnormality monitoring unit 100 includes a motor rotation number abnormality monitoring unit 101 that detects a rotation number abnormality of the fan motor 17 a of the internal fan 17, a chamber temperature monitoring unit 102 that detects a temperature abnormality of the product storage box 12, and a timer 93. When an abnormality is detected by the timer monitoring unit 103 that detects an operation abnormality of the above, each of the monitoring units 101 to 103, the AC power supply monitoring unit 71, and the DC power supply monitoring unit 72, it controls the issuing of an alarm for the abnormality. An alarm control unit 104 and an abnormality history storage unit 105 that stores a history of abnormality that has occurred are provided.

  The motor rotation number monitoring unit 101 monitors the output rotation number of the motor rotation number detection sensor 17b attached to the fan motor 17a. Examples of the motor rotation speed detection sensor 17b include a sensor that detects the rotation speed of a rotor attached to the rotation shaft of the fan motor 17a with an optical sensor. Hereinafter, a method of detecting the rotational speed abnormality by the motor rotational speed monitoring unit 101 will be described with reference to the timing chart of FIG.

  The motor rotation speed monitoring unit 101 states that “a state where the rotation speed of the fan motor 17a is lower than a normal rotation speed is lower than a predetermined reference rotation speed (800 rpm in the example of FIG. 6) or less is a predetermined reference time (example of FIG. 6). It is determined that the motor rotation speed is abnormal. When the motor rotation number monitoring unit 101 detects an abnormality in the motor rotation number, the motor rotation number monitoring unit 101 stops the fan motor 17a for a predetermined stop time (10 minutes in the example of FIG. 6). After that, when the motor rotation speed abnormality is not resolved even when the driving of the fan motor 17a is resumed, that is, when the reference rotation speed is not reached within the reference time, the alarm control unit 104 is notified of the motor rotation speed abnormality. . Thereafter, the motor rotation number monitoring unit 101 repeats the stop / restart process of the fan motor 17a. As a result of repeating stop / restart of the fan motor 17a, when the motor rotation speed abnormality is resolved, that is, when the reference rotation speed is reached within the reference time, a motor rotation speed abnormality is detected with respect to the alarm control unit 104. Notify that it has been resolved.

  A temperature abnormality detection method by the internal temperature monitoring unit 102 will be described with reference to the timing chart of FIG. When the temperature detected by the temperature sensor 19 reaches or exceeds a predetermined reference temperature (−15 ° C. in the example of FIG. 7), the internal temperature monitoring unit 102 integrates the difference between the detected temperature and the reference temperature over time. When the integrated value becomes equal to or greater than a predetermined reference value, it is determined that a temperature abnormality has occurred. That is, when the hatched areas S1 and S2 in FIG. However, in the internal temperature monitoring unit 102 according to the present embodiment, in order to simplify the process, the approximate value of the integrated value is calculated as follows, and the approximate value is compared with the reference value. To detect the occurrence of abnormal temperature. That is, the internal temperature monitoring unit 102 detects the internal temperature using the internal temperature sensor 19 periodically (for example, every minute), and integrates the difference between the detected temperature and the reference temperature. Then, when the integrated value becomes a predetermined reference value (for example, 75) or more, a temperature abnormality is notified to the alarm control unit 104. On the other hand, when the internal temperature becomes equal to or lower than the predetermined reference temperature, the alarm control unit 104 is notified that the temperature abnormality has been resolved.

  The timer monitoring unit 103 monitors the output date and time of the timer 93, and when detecting that the output date and time does not change for a predetermined period, notifies the alarm control unit 104 and the defrost processing unit 92 of the timer abnormality. . Further, the timer monitoring unit 103 notifies the alarm control unit 104 and the defrosting processing unit 92 of the timer abnormality even when the output date and time of the timer 93 is abnormal. Here, the output date / time abnormality is appropriate as the date / time, for example, when the “minute” of the output date / time exceeds 59 or when it is negative, or when the “month” exceeds 12 or when it is negative. For example, the value deviates from the range value.

  The alarm control unit 104 issues an alarm when the AC power supply monitoring unit 71, the DC power supply monitoring unit 72, the motor rotation number monitoring unit 101, the internal temperature monitoring unit 102, and the timer monitoring unit 103 detect an abnormality. Specifically, the alarm control unit 104 turns on the first alarm LED 33 of the display unit 30 and the second alarm LED 42 of the operation unit 40 when each of the monitoring units 71, 72, 101 to 103 detects an abnormality, and the buzzer. An alarm sound is emitted from 43, and an error code corresponding to each abnormality is displayed on the information display LED 41. Further, the alarm control unit 104 stores in the abnormality history storage unit 105 that the abnormality has occurred when the alarm is issued.

  However, in the alarm control unit 104, when the AC power supply monitoring unit 71 and the DC power supply monitoring unit 72 detect power supply return, the motor rotation number monitoring unit 101, the internal temperature monitoring unit 102, and the timer monitoring unit 103 detect abnormality. If the abnormality is detected even when the power supply is abnormal, the alarm is not issued and the history is not stored in the abnormality history storage unit 105. Such processing is realized by referring to the abnormality history storage unit 105 and confirming whether or not the abnormality is recorded when each of the monitoring units 101 to 103 detects an abnormality at the time of detecting the power recovery.

  Moreover, the alarm control part 104 stops the warning sound of the buzzer 43 when predetermined time (for example, 10 minutes) passes since issuing an alarm. Furthermore, the warning control unit 104 stops the warning sound of the buzzer 43 when detecting the pressing of the buzzer stop button 45 while the warning sound is being emitted by the buzzer 43.

  According to such a refrigeration showcase 1, when various power supply abnormalities such as supply of AC power supply stop, significant voltage drop or failure of the switching power supply device 60 occur, when the rotational speed abnormality of the fan motor 17 a occurs, When a temperature abnormality occurs or a timer abnormality occurs, an alarm is issued, so that the store clerk recognizes the occurrence of the abnormality and can take appropriate measures. Moreover, since the warning sound by the buzzer 43 among the warnings can be stopped by the buzzer stop button 44, it is suitable for operation in a store.

  Further, when an abnormality occurs in the rotational speed of the fan motor 17a, an alarm is issued only when the rotational abnormality continues even if the fan motor 17a is stopped or restarted. Can be prevented. Examples of such a case include a case where a rotational speed abnormality temporarily occurs due to a slight foreign matter mixing or mischief.

  Further, when an abnormality of the timer 93 is detected, the next defrosting time is switched from the time measured by the timer 93 to the counter process, so that a reliable defrosting operation can be performed even if an abnormality occurs in the timer 93.

  Furthermore, even if a power failure such as a power failure occurs, if a warning has already been issued for other abnormalities such as the fan motor 17a when the power failure occurs, the warning will be issued even if the abnormality continues when the power is restored. Since it is not issued, it is suitable for operation in a store. In this case, since the recording to the abnormality history storage unit 105 is not performed, the storage capacity of the abnormality history storage unit 105 can be saved.

  Furthermore, an alarm is issued not only when the internal temperature becomes equal to or higher than the predetermined reference temperature but also when the integrated value of the difference between the internal temperature and the reference temperature becomes equal to or higher than the predetermined value. In particular, an alarm is not issued when there is no effect on the product deterioration or the like only when the internal temperature rises. That is, the alarm is not excessively issued, which is preferable for operation.

  Although one embodiment of the present invention has been described in detail above, the present invention is not limited to this. For example, in the above-described embodiment, the refrigerated showcase in which the air curtain is formed on the upper surface of the commodity storage has been described in detail, but the showcase in which the air curtain is formed on the front surface may be used.

In the above embodiment, as a means for issuing an alarm, the first alarm LED 3 3 provided on the display unit 3 0 and the second alarm LED 4 provided on the operation unit 4 0 are provided.
The buzzer 4 3 is used, but other means may be used. That is, any means may be used as long as it appeals to the visual and auditory senses of a store clerk or the like.

  In the above embodiment, the power supply monitoring device 70 monitors and detects both AC and DC power supply abnormalities, but only one of them may be used.

External perspective view of a frozen showcase Cross section of frozen showcase Front view of display Front view of the operation unit Control block diagram of refrigerated showcase Timing chart explaining how to detect fan motor rotation speed abnormality Timing chart explaining how to detect internal temperature abnormalities

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Refrigeration showcase, 10 ... Outer box, 11 ... Inner box, 12 ... Merchandise storage, 13 ... Ventilation path, 14 ... Discharge port, 15 ... Suction port, 16 ... Evaporator, 17 ... Blower in chamber, 17a ... Fan motor, 17b ... Motor rotation speed detection sensor 17b, 18 ... Heater, 19 ... Inside temperature sensor, 20 ... Machine room, 21 ... Compressor, 22 ... Condenser, 23 ... Machine room blower, 24 ... Outside air intake, 25 ... Waste heat outlet, 26 ... Air filter, 30 ... Display unit, 31 ... Inside temperature display LED, 32 ... Filter cleaning sign LED, 33 ... First alarm LED, 40 ... Operation unit, 41 ... Information display LED, 42 ... second alarm LED, 43 ... buzzer, 44 ... defrosting LED, 45 ... buzzer stop button, 46 ... defrost stop button, 50 ... control device, 60 ... switching power supply device, 70 ... power supply monitoring device, 71 ... AC Power supply monitoring unit 72 ... DC power supply monitoring unit, 90 ... Main control unit, 91 ... Internal temperature control unit, 92 ... Defrosting processing unit, 93 ... Timer, 100 ... Abnormality monitoring unit, 101 ... Motor rotation number monitoring unit, 102 ... Inside Temperature monitoring unit 103 ... Timer monitoring unit 104 ... Alarm control unit 105 ... Abnormal history storage unit

Claims (9)

In a refrigeration showcase comprising a power supply device that converts alternating current power into direct current, and a control device that operates by direct current supplied from the power supply device,
A fan motor that drives a cooling fan installed in the machine room;
A rotational speed monitoring means for monitoring the rotational speed of the fan motor;
With a backup battery,
The controller is
Power supply monitoring means for supplying a direct current from the backup battery to the control device when a power supply abnormality is detected by monitoring power supply to the control device by the power supply device, and when at least the power supply monitoring means detects a power supply abnormality, the power supply An alarm means for storing the supply abnormality in a predetermined history storage means and issuing an alarm from a predetermined output device ;
When the rotational speed monitoring means detects an abnormality in the rotational speed of the fan motor, the alarm means (a) stops the fan motor for a predetermined time and then restarts it. (B) Even after restarting, the rotational speed abnormality of the fan motor is abnormal. Is stored in the history storage means, an alarm is issued, and (c) the processing (a) and the processing (b) are repeated . The alarm means is a case where the rotational speed monitoring means detects an abnormality in the rotational speed of the fan motor when the power monitoring means detects a return from an abnormal power supply, and the power monitoring means detects a power supply abnormality. in the case of being recorded history by detecting the rotational speed abnormality, according to claim 1, wherein a is not performed storage and alarm issued to the history storage means for rotational number abnormalities at power supply recovery Frozen showcase. In a refrigeration showcase comprising a power supply device that converts alternating current power into direct current, and a control device that operates by direct current supplied from the power supply device,
Temperature detecting means for detecting the temperature of the product storage;
With a backup battery,
The controller is
Power supply monitoring means for supplying a direct current from the backup battery to the control device when a power supply abnormality is detected by monitoring power supply to the control device by the power supply device, and when at least the power supply monitoring means detects a power supply abnormality, the power supply An alarm means for storing the supply abnormality in a predetermined history storage means and issuing an alarm from a predetermined output device ;
The alarm means starts a process of integrating the difference between the internal temperature and the reference temperature over time when the internal temperature detected by the temperature detection means is equal to or higher than a predetermined reference temperature, and the integrated value is a predetermined value. In the case of the above , the refrigeration showcase characterized by storing the temperature abnormality in the storage in the history storage means and issuing an alarm . In a refrigeration showcase comprising a power supply device that converts alternating current power into direct current, and a control device that operates by direct current supplied from the power supply device,
A timer that counts the current time,
With a backup battery,
The controller is
Power supply monitoring means for supplying a direct current from the backup battery to the control device when a power supply abnormality is detected by monitoring power supply to the control device by the power supply device, and when at least the power supply monitoring means detects a power supply abnormality, the power supply An alarm means for storing the supply abnormality in a predetermined history storage means and issuing an alarm from a predetermined output device ;
When the alarm means detects that the timer output date / time has not changed for a predetermined period or when it detects that the timer output date / time is abnormal, it stores the timer abnormality in the history storage means and issues an alarm. A freezing showcase characterized by discharge . With a heater to defrost frost adhering to the cooler,
The control device performs defrosting operation by turning on the heater at predetermined time intervals based on the time and date of the timer, and when the alarm means detects a timer abnormality, starts a counting process and starts a predetermined counter. The refrigeration showcase according to claim 4, further comprising a defrosting control unit that performs a defrosting operation at intervals. With a defrost stop button to stop the defrost operation,
The refrigeration showcase according to claim 5, wherein the defrosting control unit stops the defrosting operation when it detects pressing of the defrosting stop button during the defrosting operation. The refrigeration showcase according to any one of claims 1 to 6, wherein the power monitoring means detects an abnormal supply of alternating current to the power supply device. The refrigeration showcase according to any one of claims 1 to 7, wherein the power supply monitoring unit detects a DC supply abnormality caused by a power supply device. It has an alarm stop button to stop the alarm,
The refrigeration showcase according to any one of claims 1 to 8, wherein the alarm means stops the alarm when the pressing of the alarm stop button is detected while the alarm is issued.

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