JP7625429B2 - Discharge test method for standby power supply in fire alarm receiver and fire alarm receiver - Google Patents

Description

The present invention relates to a discharge test method for a standby power supply, which tests whether a standby power supply having a built-in battery provided in a fire receiver has the desired performance, and to a technology that is effective when applied to a fire receiver equipped with a standby power supply testing device.

Conventionally, in disaster prevention monitoring systems equipped with fire receivers and fire monitoring control panels that receive detection signals from fire detectors and issue fire warnings, a standby power supply unit with a built-in secondary battery for backup in the event of a power outage is provided in addition to a main power supply unit that runs on commercial AC power.

The secondary battery used in the standby power supply of a fire alarm receiver is, under normal monitoring conditions, kept in a charged state by a DC voltage obtained by rectifying and smoothing a commercial AC power supply, but since the secondary battery may deteriorate over a long period of use and may become insufficient in charge capacity, the standby power supply is tested periodically and as necessary. The standby power supply test is often configured to be performed by operating a standby power supply test switch provided on the fire alarm receiver.
Conventional inventions relating to discharge testing of a standby power supply device for a fire protection detector include those described in, for example, Patent Documents 1 to 3.

Japanese Patent Application Publication No. 09-35156 Japanese Utility Model Application Publication No. 64-5178 JP 2019-78636 A

When fire alarms equipped with a backup power supply are assembled at the factory, a discharge resistor is connected for a discharge test of the secondary battery, and after the confirmation test is performed, the alarm is shipped with the discharge resistor still connected. However, after the receiver is installed, for example, during maintenance and inspection, it may be determined that a circuit board or the like needs to be replaced. When replacing the circuit board, the discharge resistor needs to be disconnected and then reconnected after the board is replaced. However, sometimes this connection is forgotten and the resistor is left unconnected, or the connection wire is damaged during the wiring process, resulting in a disconnection.

Meanwhile, receivers are equipped with a function to perform automatic tests of each of the receiver's functions required at the time of installation (start of operation), including a discharge test of the secondary battery of the backup power supply unit (hereinafter referred to as the backup battery); if the circuit board is replaced, the test is performed before restarting operation. However, with conventional receivers, the discharge test is performed by disconnecting the charging circuit from the backup battery, connecting a discharge resistor as a dummy load, and measuring the backup battery voltage after discharge. This has revealed an issue that, as described above, the measurement is performed with the discharge resistor in an unconnected or disconnected state, and there is a risk that a reliable discharge test is not performed.

The present invention was made with the above-mentioned problems in mind, and its purpose is to prevent human error from causing a test to be performed without the discharge resistor connected during a fixed-time battery test (discharge test), in which a spare battery is discharged through a discharge resistor for a specified period of time, such as 10 minutes.

In order to solve the above problems, the present invention relates to
A method for testing a standby power supply in a fire control panel, comprising: a standby power supply device having a built-in display unit and a battery; and a method for testing whether the standby power supply device has a desired performance by passing a predetermined current from the standby power supply device to a discharge resistor for a predetermined test time, comprising:
a first voltage determination step of determining whether a difference voltage between a voltage measured at a time when a predetermined time shorter than the test time has elapsed after the start of the test and a voltage measured at the start of the test is equal to or greater than a predetermined voltage;
a second voltage determination step of determining whether or not a measured voltage of the standby power supply device at a time when the test time has elapsed after the start of the test is equal to or greater than a predetermined voltage value;
having
when it is determined in the first voltage determination step that the differential voltage is smaller than the predetermined voltage, the discharge test is forcibly terminated, and a "disconnection of the discharge resistor" is displayed on the display unit as a cause of termination of the test;
If the first voltage determination step determines that the differential voltage is equal to or greater than the predetermined voltage, the discharge test is continued. If the second voltage determination step determines that the measured voltage is higher than the predetermined voltage value, an output is output indicating that the battery is normal. Conversely, if the measured voltage is lower than the predetermined voltage value, an output is output indicating that the battery is abnormal and the test is terminated.

When a battery test is performed without the discharge resistor connected, no current flows through the discharge resistor, so the voltage of the spare battery hardly drops even after a certain amount of time has passed. According to the discharge test method having the above steps, if the voltage drop of the spare battery is large after the start of the test, it is determined that the discharge resistor is normally connected and the discharge test is continued, and if the voltage drop of the spare battery is small after the start of the test, it is determined that the discharge resistor is not connected or is in a broken state and the discharge test is terminated. This makes it possible to prevent a fixed-time battery test (discharge test) in which the spare battery is discharged through the discharge resistor for a specified time from being performed without the discharge resistor connected due to human error. This also makes it possible to prevent erroneous test results from being displayed.

Furthermore, according to the above method, the disconnection of the discharge resistor is displayed as the cause of the test termination, so that the supervisor can easily understand the reason when the test is terminated midway.
Here, the predetermined time shorter than the test time in the first voltage determination step is , for example, half the test time .
In this way, it is possible to reliably determine whether the discharge resistor is not connected.

Also, preferably, a required charging time calculation step of calculating a required charging time required for charging the standby power supply device after power recovery from a power outage or after a standby power supply test is completed based on a measured voltage of the standby power supply device at the time of power recovery from a power outage or after a standby power supply test is completed;
an elapsed time measuring step of measuring an elapsed time from a time when the power supply is restored or a time when a backup power supply test is completed;
a time determination step of determining whether the elapsed time is longer than the required charging time when a command to start a standby power supply test is input;
A discharge test of the standby power supply device is started in response to a determination in the time determination step that the elapsed time is longer than the required charging time.
According to this method, when starting a discharge test of a spare battery, if the time elapsed since power recovery or the previous discharge test is shorter than the time required to charge the battery, the discharge test will not be started. Therefore, by repeatedly performing discharge tests in a relatively short period of time, it is possible to perform a fixed-time discharge test of the spare battery while preventing further deterioration of the battery.

Another invention of the present application is a fire receiver comprising a standby power supply device with a built-in battery, voltage measuring means for measuring the voltage of the standby power supply device, a standby power supply testing device capable of testing whether or not the standby power supply device has desired performance by passing a predetermined current from the standby power supply device to a discharge resistor for a predetermined test time, a display device, an information notification lamp for notifying that there is information to be displayed, and an operation button for issuing a command to display the information ,
The standby power supply test device includes:
a first voltage determination means for determining whether a difference voltage between a voltage measured at a time when a predetermined time shorter than the test time has elapsed after the start of the test and a voltage measured at the start of the test is equal to or greater than a predetermined voltage;
a second voltage determination means for determining whether or not a measured voltage of the standby power supply device at a time when the test time has elapsed after the start of the test is equal to or greater than a predetermined voltage value;
when the first voltage determination means determines that the differential voltage is smaller than the predetermined voltage, it is determined that the discharge resistor is in an unconnected state or in an open state, and the discharge test is forcibly terminated, and when the discharge test is forcibly terminated, the display device is caused to display that the termination is due to the unconnection of the discharge resistor;
When the first voltage determination means determines that the differential voltage is equal to or greater than the predetermined voltage, it is determined that a discharge resistor is connected and the discharge test is continued; when the second voltage determination means determines that the measured voltage is higher than the predetermined voltage value, it outputs an indication that the battery is normal, whereas when the second voltage determination means determines that the measured voltage is lower than the predetermined voltage value, it outputs an indication that the battery is abnormal and ends the test.

With a fire receiver configured as described above, if the amount of voltage drop in the spare battery is large after the start of the test, it is determined that the discharge resistor is normally connected and the discharge test is continued, and if the amount of voltage drop in the spare battery is small after the start of the test, it is determined that the discharge resistor is not connected or is in an open state and the discharge test is terminated.Therefore, in a fixed-time battery test (discharge test) in which the spare battery is discharged through the discharge resistor for a specified time, it is possible to prevent the test from being performed in a state in which the discharge resistor is not connected due to human error.
Furthermore, because the disconnection of the discharge resistor is displayed as the cause of the test termination, the supervisor can easily understand the reason when the test is terminated midway.

According to the standby power supply discharge test method and fire alarm receiver of the present invention, in a fixed-time battery test (discharge test) in which a standby battery is discharged through a discharge resistor for a predetermined time such as 10 minutes, it is possible to prevent a test from being performed with the discharge resistor disconnected due to human error, and thereby to prevent an erroneous test result from being displayed . Furthermore, there is an effect that it is possible to know that an inappropriate test is being performed or has been performed before the predetermined time (10 minutes) has elapsed .

1 is a front view showing an example of the configuration of a fire receiver equipped with a standby power supply test device according to the present invention; 2 is a block diagram showing an example of the configuration of a standby power supply test device provided in a fire control panel according to an embodiment; 5 is a flowchart showing an embodiment of a procedure for a discharge test process performed by the standby power supply testing device according to the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Fig. 1 shows an example of the configuration of the front panel of a fire receiver equipped with a standby power supply testing device according to the present invention. The fire receiver 10 in Fig. 1 is installed in a disaster prevention center or a central control room of a building, and has the function of receiving a fire signal from a detector or a transmitter installed in the building, sounding a local sound device to notify the occurrence of a fire by sound, and announcing the occurrence of a fire by displaying a lamp or the like provided on the front panel of the fire receiver 10. In addition, a standby power supply device and a standby power supply testing device for testing the standby power supply device are provided inside the housing of the fire receiver 10.

As shown in FIG. 1, the front panel of the fire receiver 10 is equipped with a main operation unit 11 that displays the operating status of the fire receiver, such as AC power on, fire alarm, and transmitter signal input, by lighting various lamps, a district display unit 12 for the fire alarm line that displays the line where the fire alarm was generated and the line where the detector line has been disconnected, a district display unit 13 for the smoke control line that displays the location of the fire and the location where the smoke control terminal has been activated, a speaker 14 that notifies of the occurrence of a fire, etc., an audio operation unit 15 with a push button for stopping the receiver's sound and bell (district sound), an information display unit 16 consisting of an LCD (liquid crystal panel) that displays information such as the receiver's operating mode and the results of a battery test described below, a display operation unit 17 with a shift button for changing the displayed content, and an information operation unit 18 with an information button 18a and an information lamp 18b for displaying the details of the fire and abnormality of the receiver on the information display unit 16 for confirmation.

In the information operation unit 18, when there is a cause to notify the supervisor, the information lamp 18b flashes, and by pressing the information button 18a, fire information, abnormality information, etc. are displayed on the information display unit 16. In addition, an openable sub-door 10a is provided at the bottom of the front panel of the fire receiver 10, and on the inside of the sub-door 10a, an internal operation unit 19 is provided that has a battery test switch button 19A that commands the start of a battery test described below, a fire test switch button 19B that commands the start of a fire test, a test recovery button 19C that commands recovery from a test, and a recovery button 19D that commands recovery from a fire state.

The display operation unit 17 is provided with a shift button (△) for forwarding the displayed contents, a shift button (▽) for reversely shifting the displayed contents, a "back" button for returning the display mode to the original, and a "decision" button 17D for deciding the display mode.
Although not shown, a control board that receives command inputs from the operation units (11, 17, 18) and drives the display units (12, 13, 16) and speaker 14 is installed inside the housing of the fire receiver 10. Furthermore, a backup power supply device that supplies power to the control board and the like in the event of a commercial AC power outage and a backup power supply testing device that tests the backup power supply device are provided inside the housing of the fire receiver 10, and the backup power supply device is provided with a discharge resistor as a dummy load for a discharge test of the backup battery.

FIG. 2 shows an example of the configuration of a standby power supply test device provided in the fire control panel of this embodiment.
As shown in Figure 2, the standby power supply testing device in this embodiment includes a battery test control board 20 provided within the housing of the fire receiver 10, a voltage measuring unit 22 that detects the voltage of the standby power supply device 30, and a timer 23 for measuring time.

Command signals are input to the battery testing control board 20 from the battery test button 19A which commands the start of a battery test, the information button 18a of the information operation unit 18, and the shift buttons 17A, 17B, "Back" button 17C, and "Decision" button 17D of the display operation unit 17, and the battery testing control board 20 is configured to control the display drive of the information display unit 16 and the lighting drive of the information lamp 18b in response to signals from these input means.
The battery test control board 20 is equipped with known devices (circuits) such as a main power supply/standby power supply switching device and a battery charging/battery connection monitoring device (not shown).

3 shows a flowchart of one embodiment of the procedure of a 10-minute discharge test method using a standby power supply test device provided in the housing of the fire control panel 10. The discharge test is performed by passing a predetermined current from the standby power supply to a discharge resistor for a predetermined time (e.g., 10 minutes).
In the discharge test process shown in Fig. 3, if a discharge resistor is connected, a current flows through the discharge resistor at the start of the discharge test, causing the battery voltage to drop, whereas if a discharge resistor is not connected, the battery voltage does not drop even when a discharge test is performed. Based on this, the presence or absence of a discharge resistor is determined. The discharge test process shown in Fig. 3 will now be described.

The discharge test process shown in Figure 3 is started by simultaneously pressing (turning on) the battery test switch button 19A provided on the internal operation section 19 (see Figure 1) inside the sub-door 10a and the decision switch button 17D provided on the front panel.
When the above operation is performed, first it is determined whether the time elapsed from when the backup power source was switched from the main power source to the backup power source during the previous power outage and when the power source was restored (the time of switching) to the time when the current discharge test operation is performed, or the time elapsed from the end of the previous discharge test to the start of the current discharge test operation, is longer than the time required to fully charge the battery in the backup power source device calculated at the end of the previous discharge test (step S1).

The time required to fully charge a battery is expressed as follows: Vd is the measured voltage at the end of a 10-minute discharge test, Ve is the measured voltage at the end of the previous 10-minute discharge test, and if the charging voltage of an undegraded battery is Vf (e.g. 28.8 V) and the time required to fully charge is Tc (e.g. 48 hours), then the time T (h) required to charge a battery that has undergone a discharge test is calculated using the following formula: T (h) = (Vf-Ve) ÷ (Vf-Vd)/Tc
The closer the measured voltage Vd at the end of the test is to Vf, the smaller the value of (Vc-Vd) will be, and therefore the shorter the required charging time will be.

If it is determined in step S1 above that the time required for charging the battery has not elapsed (No), the process proceeds to step S11 without starting the 10-minute discharge test, and a message to that effect and the remaining time until the next 10-minute discharge test can be performed (required charging time - elapsed time) are calculated and displayed on the information display unit 16 provided on the front panel of the fire control panel 10. The required charging time may be calculated immediately before step S11, or after step S10 described below.
On the other hand, if it is determined in step S1 that the elapsed time is longer than the time required to fully charge the battery (Yes), the process proceeds to step S2, the lamp indicating "Battery Test" is turned on, a discharge test is started for 10 minutes, and then the voltage value of the spare battery measured by the voltage measurement unit 22 is read (step S3).

Then, it is determined whether the measured battery voltage is equal to or greater than a preset value Va (e.g., 12.0 V) (step S4). If it is determined that the battery voltage is not equal to or greater than the preset value Va (No), an abnormal termination of battery charging is displayed on the information display unit 16. In addition, the information lamp 18b, which indicates that there is information to display, lights up or flashes, and the discharge test is forcibly terminated for 10 minutes. After that, when the information button 18a is pressed, the cause of the abnormality (termination) (in this case, a defective battery) is displayed on the information display unit 16.

Also, if it is determined in step S4 that the battery voltage is equal to or higher than the predetermined value Va (Yes), the process proceeds to step S5, where the elapsed time (or remaining time) and the measured voltage are displayed on the information display unit 16 on the front panel of the fire control device 10.
Then, the process proceeds to step S6 to determine whether the battery test switch button B1 has been pressed (turned on). If it is determined that the test switch has not been turned on (Yes), the process proceeds to step S7 to determine whether, for example, five minutes have passed since the start of the test. If it is determined that this time has not passed (No), the process returns to step S3 and repeats the above process.

On the other hand, if it is determined in step S7 that five minutes have passed (Yes), the process proceeds to step S8 to determine whether the voltage difference ΔV between the battery voltage after five minutes has passed and the battery voltage before the test started is equal to or greater than a preset voltage Vc (e.g., 1.0 V). If it is determined that the battery voltage is less than the preset value Vc (No), that is, ΔV has not increased significantly even after five minutes have passed since the start of the battery discharge test, the discharge test is terminated as it is determined that the discharge resistor is not connected, and the cause of the forced termination (discharge resistor not connected) is displayed on the information display unit 16. When the discharge test is terminated, the information display unit 16 indicates that the test has been terminated by turning on or blinking the information notification lamp, and then when the information button 18a is pressed, the information display unit 16 may display the cause of the termination (discharge resistor not connected).

If it is determined in step S8 that the voltage difference ΔV between the battery voltage after 5 minutes has elapsed and the battery voltage before the test started is equal to or greater than the predetermined voltage Vc (Yes), that is, if the battery voltage has dropped to a certain extent due to discharging, the test is continued. Then, the process proceeds to step S9 to determine whether 10 minutes have elapsed since the start of the test. If it is determined that 10 minutes have not elapsed (No), the process returns to step S3 and the above process is repeated.

If it is determined in step S9 that 10 minutes have passed (Yes), the process proceeds to step S10 to determine whether the battery voltage after 10 minutes has passed is equal to or higher than a preset value Vb (e.g., 20.4 V), and if it is determined that the battery voltage is equal to or higher than the preset value Vb (Yes), the discharge test is normally completed. Then, the end status (backup battery normal) is displayed on the information display unit 16.
Furthermore, if it is determined in step S10 that the battery voltage after 10 minutes has elapsed is not equal to or greater than the predetermined value Vb (No), the discharge test is terminated and the termination status (reserve battery abnormality) is displayed on the information display unit 16. If the discharge test is terminated abnormally, the abnormal termination may be displayed, for example, by an information notification lamp on the information display unit 16 being lit or flashing, and then, when the information button 18a is pressed, the cause of the termination (reserve battery abnormality) may be displayed on the information display unit 16.

On the other hand, if it is determined in step S6 that the test switch has been turned on (No), that is, that the test switch has been turned on after the start of the battery test for 10 minutes, the flow proceeds to step S12 to determine whether or not 5 minutes have elapsed since the start of the discharge test.
If it is determined that five minutes have elapsed (Yes), the process proceeds to step S13, where it is determined whether the differential voltage ΔV between the battery voltage after five minutes has elapsed and the battery voltage before the test started is equal to or greater than a predetermined voltage Vc (e.g., 1.0 V). If it is determined that the battery voltage is less than the predetermined voltage Vc (No), it is determined that the discharge resistor is not connected, and the discharge test is forcibly terminated, and the cause of the forcible termination (discharge resistor not connected) is displayed on the information display unit 16.
When the discharge test is forcibly terminated, the information display unit 16 may indicate that the test has been forcibly terminated by causing the information lamp to light up or flash, and when the information button 18a is subsequently pressed, the information display unit 16 may display the cause of the termination (discharge resistor not connected).

On the other hand, if it is determined in step S12 that five minutes have not elapsed (No), step S13 is skipped and the process proceeds to step S14, where it is determined whether the battery voltage after five minutes has elapsed is equal to or greater than a preset value Vb (e.g., 20.4 V). If it is determined that the battery voltage is equal to or greater than the preset value Vb (Yes), the discharge test is terminated normally. Then, the end status (backup battery normal) is displayed on the information display unit 16. Thereafter, when the information button 18a is pressed, the end status (discharge test normal) is displayed on the information display unit 16. In addition, when the shift button on the display operation unit 17 is pressed, the time required for full charge can be displayed.

Furthermore, if it is determined in step S14 that the battery voltage is not equal to or greater than a predetermined value Vb (e.g., 20.4 V) (No), the 10-minute battery test ends and the end status (reserve battery abnormality) is displayed on the information display unit 16. Also, the information lamp 18b lights up or flashes. After that, when the information button 18a is pressed, the cause of the abnormality (end) (reserve battery abnormality) is displayed on the information display unit 16.
As described above, in the process of steps S12 to S14, if the test switch is turned on again after the start of the battery test for 10 minutes, the battery test is forcibly terminated immediately, without waiting for the 10 minutes to elapse, by distinguishing whether the spare battery is normal or abnormal. Even in this forced termination process, it is possible to determine whether the discharge resistor is not connected and display the result.

Although the invention made by the inventor has been specifically described above based on an embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, if it is determined in step S10 that the battery voltage is not equal to or greater than a predetermined value Vb (e.g., 20.4 V) (No), the battery test is immediately terminated as an abnormality. However, if it is determined that the battery voltage is not equal to or greater than the predetermined value Vb (No), it may be determined whether the battery voltage is equal to or greater than a predetermined value Va (e.g., 12.0 V), and if the number of such determinations has not reached a predetermined number (e.g., twice), the test is terminated as an abnormality due to a defective spare battery if the number of determinations has reached the predetermined number.

In the above embodiment, the required charging time at the start of the discharge test is calculated based on the measured voltage of the backup power supply (battery), the charging voltage of an undegraded battery, and the time required for full charging at that charging voltage, but this is not limited to this. For example, the required charging time may be calculated from the discharge amount at the start of the discharge test from the start of the required charging time (at the end of the discharge test, during a power outage, or when the battery is fully charged). Specifically, an ammeter that measures the current value on the output side of the battery may be provided in the backup power supply (battery test control board 20), and the discharge capacity may be calculated from the product of the discharge current and the discharge time, and the required charging time may be calculated from the charging current value.

Furthermore, in the above embodiment, a configuration was described in which a discharge test is started by pressing the battery test switch button 19A and the “Decision” button 17D, but a configuration in which a discharge test is started by pressing the battery test switch button 19A may also be used.
In addition, in the above explanation, an example was given of the case where the standby power supply testing device of the present invention is applied to a standby power supply testing device for a fire detector, but it is also possible to apply it to a testing device for a standby power supply provided in a monitoring device such as a fire monitoring control panel.

10. Fire receiver (monitoring device)
11 Main operation unit 12 Area display unit for fire alarm line 13 Area display unit for smoke control line 14 Speaker 15 Audio operation unit 16 Information display unit (display device)
17 Display operation section 18 Information operation section 18a Information button (operation button)
18b Information lamp (information notification lamp)
19 Internal operation section 19A Battery test switch button (operation button)

Claims (3)

A method for testing a standby power supply discharge in a fire control panel, the method comprising: a standby power supply device having a built-in display unit and a battery; and testing whether the standby power supply device has a desired performance by passing a predetermined current from the standby power supply device to a discharge resistor for a predetermined test time, the method comprising:
a first voltage determination step of determining whether a difference voltage between a voltage measured at a time when a predetermined time shorter than the test time has elapsed after the start of the test and a voltage measured at the start of the test is equal to or greater than a predetermined voltage;
a second voltage determination step of determining whether or not a measured voltage of the standby power supply device at a time when the test time has elapsed after the start of the test is equal to or greater than a predetermined voltage value;
having
when it is determined in the first voltage determination step that the differential voltage is smaller than the predetermined voltage, the discharge test is forcibly terminated, and a "disconnection of the discharge resistor" is displayed on the display unit as a cause of termination of the test;
A discharge test method for a standby power source in a fire control receiver, characterized in that if the first voltage determination step determines that the differential voltage is equal to or greater than the specified voltage, the discharge test is continued, and if the second voltage determination step determines that the measured voltage is higher than the specified voltage value, an output is output indicating that the battery is normal, and if the measured voltage is determined to be lower than the specified voltage value, an output is output indicating that the battery is abnormal and the test is terminated. a required charging time calculation step of calculating a required charging time required for charging the standby power supply device after power recovery from a power outage or after a standby power supply test is completed based on a measured voltage of the standby power supply device at the time of power recovery from a power outage or after a standby power supply test is completed;
an elapsed time measuring step of measuring an elapsed time from a time when the power supply is restored or a time when a backup power supply test is completed;
a time determination step of determining whether the elapsed time is longer than the required charging time when a command to start a standby power supply test is input;
A discharge test method for a standby power supply in a fire protection device as described in claim 1 , characterized in that a discharge test of the standby power supply device is started in response to the elapsed time being determined to be longer than the required charging time in the time determination process. A fire receiver comprising: a standby power supply device having a built-in battery; voltage measuring means for measuring the voltage of the standby power supply device; a standby power supply testing device capable of testing whether or not the standby power supply device has desired performance by passing a predetermined current from the standby power supply device to a discharge resistor for a predetermined test time; a display device; an information notification lamp for notifying that there is information to be displayed; and an operation button for issuing a command to display the information,
The standby power supply test device includes:
a first voltage determination means for determining whether a difference voltage between a voltage measured at a time when a predetermined time shorter than the test time has elapsed after the start of the test and a voltage measured at the start of the test is equal to or greater than a predetermined voltage;
a second voltage determination means for determining whether or not a measured voltage of the standby power supply device at a time when the test time has elapsed after the start of the test is equal to or greater than a predetermined voltage value;
when the first voltage determination means determines that the differential voltage is smaller than the predetermined voltage, it is determined that the discharge resistor is in an unconnected state or in an open state, and the discharge test is forcibly terminated, and when the discharge test is forcibly terminated, the display device is caused to display that the termination is due to the unconnection of the discharge resistor;
This fire receiver is characterized in that when the first voltage determination means determines that the differential voltage is equal to or greater than the predetermined voltage, it determines that a discharge resistor is connected and continues the discharge test, and when the second voltage determination means determines that the measured voltage is higher than the predetermined voltage value, it outputs that the battery is normal, and when the measured voltage is lower than the predetermined voltage value, it outputs that the battery is abnormal and terminates the test.

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