JPH0326097A - Controller for equipment - Google Patents

Abstract

PURPOSE:To prevent an operating state lamp lit with a false signal by stopping the supply of a power for lighting an operating lamp until prescribed time elapses when the power to light the operating lamp is stopped once with the initial closing operation of an operating switch. CONSTITUTION:An operating part 50 is equipped with a variable resistor circuit 51 to set a control targeted value, a first display circuit 56 which performs the display of an operating state with a prescribed AC component in a supply voltage, a second display circuit 57 which performs the display in operation when the effective voltage of the supply voltage exceeds a prescribed voltage, and a switching circuit 52 including a normally-open type switch SW1. When the normally-open type switch SW1 is operated during performing an operation, the operation of equipment is stopped, and the sequence control part of a controller supplies no power to perform the display with the second display circuit 57 even when the normally-open type switch SW1 is operated until the prescribed time elapses. Thereby, no abnormality display without relating to the operating state of the equipment is performed on the first display circuit even when the normally-open type switch is operated repeatedly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an operating unit having a variable resistance circuit for setting a control target value, which is equipped with a switch and a display element for instructing the operation of equipment. Regarding the control device. [Prior Art] As a control device that controls equipment according to the operating state of a variable resistor, a variable resistance circuit is provided in an operating section connected to the control device by two electric wires. There is one that applies a constant voltage to the resistor and determines the control target value based on the voltage that changes depending on the resistance value. In addition, for example, in a gas water heater, when multiple display elements are provided on the operating section and a voltage with a constant voltage direction is supplied to the operating section, the supplied voltage may contain an alternating current component that exceeds a predetermined voltage. The first display circuit provides an indication when the effective value of the supplied voltage (effective voltage) is equal to or higher than a predetermined voltage. A system has been proposed in which each display circuit performs an independent display, such that a first display circuit performs a display when combustion starts. In this way, in order to perform each display, each display circuit is connected in parallel with a variable resistance circuit, and while supplying each voltage for display, these voltages are interrupted for a minute period, and the Only a constant voltage is supplied, and the control target value is determined according to the setting state of the variable resistance circuit. Furthermore, a switch circuit including, for example, a normally open switch is provided in parallel with the variable resistance circuit and each display circuit,
It is being considered to control the operation of equipment by detecting the voltage that changes as the switch closes and using it as a switch to instruct the equipment to start and stop operation. [Problems to be Solved by the Invention] However, as described above, in a device in which the operating unit is equipped with two types of display circuits and a switch circuit in parallel with a variable resistance circuit, when the switch is repeatedly operated quickly. To,
When the voltage for displaying by the second display circuit is supplied intermittently in response to this, the voltage between the two wires changes, which approximates the case where the supplied voltage contains an alternating current component. This results in a state in which a pseudo signal is generated. Therefore, in the first display circuit, since the alternating current component of the pseudo signal is detected,
This causes a problem in that combustion is displayed even though no combustion is actually occurring. As described above, the present invention provides a control device that is equipped with two display circuits that display information based on two types of supply voltages on an operating section, and a switch for starting and stopping operation, which is related to the operating status of equipment. The purpose of this is to prevent abnormal displays without proper information.

[Means for Solving the Problems] The present invention provides a variable resistance circuit for setting a control target value,
A first display circuit that displays based on a predetermined alternating current component in the supply voltage, a second display circuit that displays when the effective voltage of the supply voltage is equal to or higher than a predetermined voltage, and a switch circuit including a normally open switch. An operating section in which a variable resistance circuit, the first display circuit, the second display circuit, and the switch circuit are connected in parallel; supplying a predetermined voltage to an operation unit, and when the device is stopped, to start operation of the device in response to a closing operation of the normally open switch and to perform a display by the second display circuit; and a control unit that stops supplying a predetermined voltage for operating the device and displaying information on the second display circuit in response to a closing operation of the first normally open switch while the device is in operation. In the control device, the control unit maintains the predetermined voltage for displaying the display by the second display circuit for a predetermined period of time after the operation of the device is stopped, even if the normally open switch is closed. It is a technical measure not to supply it to the operation section. [Function] In the present invention, when the normally open switch is closed while the device is not operating, the device starts operating accordingly and a voltage with an effective voltage equal to or higher than a predetermined voltage is supplied to the operating unit. The second display circuit performs display. During operation, the control target value is determined according to the setting state of the variable resistance circuit, and the equipment is controlled. Further, a display is performed by the first display circuit depending on the operating state. If the normally open switch is operated during operation, the operation of the device is stopped, and the supply of voltage for displaying information by the second display circuit is also stopped. Thereafter, even if the normally open switch is closed, voltage for display by the second display circuit will not be supplied until a predetermined period of time has elapsed.

[Effects of the Invention] In the present invention, once the operation of the device is stopped, the second display circuit displays the display even if the normally open switch is operated until a predetermined period of time elapses thereafter. No voltage is supplied for this purpose. Therefore, even if the FfA type switch is repeatedly opened and closed, the voltage for displaying by the second display circuit will not change accordingly. Therefore,
Since the voltage for displaying by the second display circuit is not supplied to the operation unit as a voltage including AC voltage, the first display circuit does not display. Therefore, abnormal displays unrelated to the operating status of the equipment will not occur. [Example] Next, the present invention will be explained based on an example shown in the drawings. Inside the combustor case lO of the gas water heater 1 shown in FIG.
A burner group 11 consisting of a plurality of burners is arranged, and a blower 12 for supplying combustion air to the burner group 11 is provided below the combustor case 10. A wood-tube heat exchanger 13 is provided above the burner group 11 in the combustor case 10, and water passing through the interior is heated by combustion heat from the burner group 11. A burner 14 for igniting the burner group 11 is provided near the burner group 1l in the combustor case 10, and a flame rod 15 for detecting ignition of the burner group 11 is provided to confirm the operation of the gas water heater 1.
is provided. An exhaust port 2 is provided above the combustor case 10 for discharging combustion exhaust gas to the outside. A nozzle pipe i6 for supplying fuel gas is provided below the burner group 11.
A plurality of fuel injection ports 16a for ejecting fuel gas are provided corresponding to each burner.

The fuel pipe 2o that guides the fuel gas to the nozzle pipe 16 includes two electromagnetic valves 21 and 22 that allow the fuel gas to pass when energized, and a governor that adjusts the amount of fuel gas supplied by controlling the supply pressure according to the energized current. Proportional valves 23 are provided in order from the upstream side. A water supply pipe 17 that leads water from a water supply source (not shown) to the heat exchanger 13 is equipped with an electric water flow control device 18 for adjusting the amount of hot water supply, and a water flow switch 19 for detecting the amount of water passing through the heat exchanger 13. A hot water supply pipe 17a which is provided sequentially from the upstream side and which guides hot water flowing out from the heat exchanger 13 to a hot water supply port (not shown) is equipped with a hot water outlet temperature thermistor 25 that detects the outlet temperature of hot water flowing out from the heat exchanger 13. ing. The gas water heater 1 having the above configuration is controlled by a control device 30 shown in FIG.
The control device i1f30 controls the sequence control section 31, the temperature control section 32, and the combustion control section 33 according to the program in the ROM.
, water 1 control section 34, and display control section 35, and is driven by remote control drive circuits 40 and 40a, respectively (hereinafter referred to as "main remote control"). 50 and a sub-remote controller (hereinafter referred to as "sub-remote controller") 60. The control device 30 is provided with terminals 36 and 37 for connecting the main remote controller 50 and terminals 38 and 39 for connecting the sub remote controller 60. The main remote control 50 has terminals 36 and 3 of the control device 30.
Terminals 50A and 50B are provided for connection between the control device W. 30 and each terminal of the main remote controller 50 are connected by two wires A40K and 40B.

In this case, since the polarity is not particularly determined, the terminals 50A and 50B of the main remote controller 50 may be connected in reverse to the terminals 36 and 37 of the control device 30.

Similarly, the sub remote controller 60 has terminal 3 of the control device 30.
Terminals 60A and 60B are provided for connection between 8 and 39, and two electric wires 40C and 40D connect each terminal. Similarly, the sub remote controller 6
0 ends 7-6OA, 60B are the terminals 38 of the control device 30.
, 39 may be connected in reverse. First, the configuration of the main remote controller 50 will be explained. The main remote controller 50 has terminals 50A and 5 as shown in FIG.
Between 0B, variable resistance circuit 51, operation switch circuit 52,
A display circuit 53 is provided in parallel. The variable resistance circuit 51 includes variable resistors VRI connected in parallel.
and a resistor Rl are connected in series with a resistor R2, and the set temperature is determined according to the resistance value of the variable resistance circuit 51, which changes when the user operates the variable resistor VRI. The operation switch circuit 52 consists of an operation switch SW1 for instructing the start and stop of operation of the gas water heater 1, and a resistor R3 connected in series with the operation switch SW1.The operation switch SWI has a normally open type. A push button switch is used,
The circuit is closed only during operation. The display circuit 53 has terminals 50A. ．． 50B is the control device 3
0 terminals 36 and 37 can be connected in reverse,
A bridge circuit 54 consisting of six diodes D1 to D6 forming a full-wave rectifier circuit, and a combustion lamp circuit 56 and an operating lamp circuit 57 provided in parallel on the output side of the bridge circuit 54 via a switching circuit 55. Become. In the bridge circuit 54, the voltage applied between the terminals 50A and 50B is connected to the switching circuit 55 and the combustion lamp circuit 56.
The rising voltage of the display circuit 53 is set high by connecting the diode D3 and the diode D4, and the diode D5 and the diode D6 in series, respectively. The current flowing to the display circuit 53 is reduced when the drive voltage to the display circuit 53 is not supplied. The switching circuit 55 is a circuit for supplying lamp lighting power to the combustion lamp circuit 56 and the operating lamp circuit 57 when the voltage supplied from the bridge circuit 54 is equal to or higher than a predetermined voltage. transistor Q
When the voltage applied to the Zener diode ZDI connected to the base of the Zener diode ZDI exceeds the breakdown voltage of the Zener diode ZDI, both the transistor Q1 and the transistor Q2 are turned on, and power is supplied to each of the lamp circuits 56 and 57. The combustion lamp circuit 56 is supplied with power for lighting the lamp from the switching circuit 55, and at that time, the diode D7
When the DC voltage applied to the resistor R5 via the AC voltage includes an AC component and the AC component exceeds a predetermined voltage, the combustion lamp L1 consisting of a light emitting diode (LED) is turned on. Here, the AC voltage applied to the resistor R5 passes through the capacitor C1, is voltage doubled and rectified by the diodes D8 and D9, and is then charged to the capacitor C2 via the resistor R6. When the charging voltage of capacitor C2 is above a certain voltage, the charge of capacitor C2 is transferred to resistor R.
7 to the transistor Q3 as a base current,
At this time transistor Q3 is turned on and the combustion lamp connected to the collector of transistor Q3! -1 lights up. The operating lamp circuit 57 lights the operating lamp L2 made of a light emitting diode when power for lamp lighting is supplied from the switching circuit 55 and the effective value of the DC voltage at that time is equal to or higher than a predetermined voltage. Here, it is charged by the supply voltage from the switching circuit 55 via the resistor R8, and when the supply voltage is lower than the charging voltage, the diode DIO
When the potential of the capacitor C3 discharged by is equal to or higher than a predetermined voltage, the base current flows to the transistor Q4 via the resistor R9, turning on the transistor Q4, and the operation lamp L2 connected to the collector of the transistor Q4 lights up. do. Next, the sub remote control 60 will be explained. The sub remote controller 60 has a terminal 60 as shown in FIG.
A variable resistance circuit 61 and a display circuit 63 are provided in parallel between A and 60B. Similar to the variable resistance circuit 51, the variable resistance circuit 61 includes a variable resistor VR2 and a resistor R11 connected in parallel.
12, and a rotary priority switch SW2 is further connected in series to these. The priority switch SW2 controls the temperature: Aitq in the control device 30.
This is a switch for controlling the temperature based on the set temperature of the sub-remote controller 60, and is a priority switch SW2 in the control device 230.
When is in the on state, the sub remote control 60 is selected,
In the off state, the main remote controller 50 is selected. The display circuit 63 has the same structure as the display circuit 53 in the main remote controller 5o, and includes a bridge circuit 64 and a combustion lamp circuit 66 provided in parallel with the output side of the bridge circuit 64 via a switching circuit 65 and equipped with a combustion lamp L3. A priority display circuit 68 is provided on the output side of the bridge circuit 64 in parallel with the switching circuit 65. The priority display circuit 68 includes a display switch SW3 and a resistor R1.
3. Priority lamps L5 consisting of light emitting diodes are connected in series. The display switch SW3 is a rotary switch that works in conjunction with the priority switch SW2, and when giving priority to the sub remote control 6o, the priority switch SW3 is
2, close the circuit and turn on the priority lamp L5. These main remote controller 50 and sub remote controller 6o are provided in the control device 3o according to the user's needs.As a basic usage pattern, when both the main remote controller 50 and the sub remote controller 60 are provided, only the main remote controller 50 is provided. There are three options: when the system is equipped with a remote control, and when it is not equipped with a remote control at all. By switching the not-shown switch, the sub remote controller 60 can be directly connected to the ends 7-36 and 37 instead of the main remote controller 50, and only the sub remote controller 60 can be used, or the sub remote controller 60 can be connected to two terminals.
machine can also be used, in which case terminals 36 and 37
The priority switch SW2 of the sub-remote controller 6o connected to the sub-remote controller 6o is used as the operation switch, but the following description will be made assuming that the main remote controller 50 is connected to the terminals 36 and 37.

Next, the control device 30 and the control device! In the control device 30, when the control device 3o is connected to the power line, the power supply (5) (not shown) is always operating and the microcomputer is in a standby state. It's working. In the sequence control unit 3l, the control device! When 30 is connected to the power line, it is always in standby state and resistor 4
Terminals 36 and 37 detected via terminals 1 and 41a, respectively.
175, each terminal voltage V, between terminals 38 and 39. , ■6.

Determine a predetermined operating mode based on. In the sequence control unit 31, each terminal voltage V, O, V66
As shown in Figure 5 or Figure 6, respectively, 0.5~2,5■ was read as the set temperature voltage, and 3
．． Read 5~5■ as disconnection detection voltage, 0.05V
Read the following as the short circuit detection voltage between terminals 36 and 37 and between terminals 38 and 39. Also, the terminal voltage V on the main remote controller 5o side. , a voltage of 0.05 to 0.3M) lower than the lowest voltage of 0.5V read as the set temperature voltage and higher than 0.05V as the short circuit detection voltage is read as the operation switch operation voltage.

On the other hand, regarding the terminal voltage V6o on the sub-remote controller 60 side, since 0.5 to 2.5V as the set temperature voltage is detected only when the priority switch SW2 is closed, the set temperature The time when the voltage is detected is the time when the sub-remote controller 60 is used preferentially. Conversely, when the priority switch SW2 is in the open state, the terminal voltage is v6. is higher than the set temperature voltage of 0.5 to 2.5V, so the case where 3.5 to 5V is detected is when the main remote controller 50 is used. In this way, when a voltage of 3.5 to 5■ is detected for the terminal voltage V66, it is not possible to determine whether it is due to a disconnection or the like or because the priority switch SW2 is in the open state. In this case, the setting state of the variable resistance circuit 61 of the sub-remote controller 60 has no bearing on the control, so there is almost no practical problem.

The operating mode is determined by each terminal voltage. , V6. is determined by determining the connection state or conduction state of each, based on whether it is the disconnection detection voltage or the set temperature voltage set respectively as described above. The operating modes include a multi mode in which the main remote controller 50 and sub remote controller 60 are both connected, an automatic mode in which neither remote controller is connected, and a single mode in which only the main remote controller 50 is connected. be. In cases other than automatic mode, the sequence control unit 31
When the operating signal of the operation switch SWI is detected, the machine enters a standby state, and in automatic mode, it is always in a standby state. In the case of multi mode, when the operation signal of the operation switch SWl is detected and the operation standby state is established, the priority switch S
Terminal voltage V6 on the sub-remote controller 60 side equipped with W2. Based on this, it is determined which remote controller is to be controlled based on the set temperature information, and the set temperature from the selected remote controller is transmitted to the temperature adjustment control section 32.

In addition, in the operation standby state, the operation standby state and
The selected remote control selection information is transmitted to the display control section 35. Note that in the sequence control unit 31, the operation switch SWI
When an instruction to start or stop operation is given by the closing operation of the
-2 seconds), no new closing operation signals will be accepted. Therefore, for example, even if a closing operation is repeatedly applied to the operation switch SWI during operation, if the start standby state is entered in response to the first closing operation, the operation standby state will not be entered within the predetermined time tl.

Conversely, even if the closing operation is repeatedly applied to the operation switch SW1 in the start standby state, once the start standby state is entered, the start standby state will not be returned until the predetermined time t1 has elapsed. This stabilizes the control state and
Unnecessary changes in behavior can be eliminated. In the operation standby state, the power of the drive circuit for driving the blower 12 and each valve of the gas water heater 1 is turned on.
When water flow to the heat exchanger 13 is detected by the water flow switch 19, a predetermined ignition sequence control is performed to start combustion, and when water flow stop is detected, a fire extinguishing sequence 'ri' is started.
Stop combustion by tm. Each terminal voltage V,. , v6. If a short circuit between terminals is detected, all control will be stopped as an abnormality has been detected. When the temperature control unit 32 enters the operation standby state and the operation state, the temperature control unit 32 reads the set temperature voltage from the selected remote controller before the water flow is detected, and starts heating based on the temperature information detected by the outlet hot water temperature thermistor 25. The amount is determined and transmitted to the combustion control section 33. The combustion control section 33 controls the blower l2 and the governor proportional valve 23 according to the heating amount determined by the temperature control section 32 to control the combustion amount of the burner group 11. In automatic mode, the system is always on standby, and when water flow is detected, the temperature is set to a certain level (e.g. 60°C or 75°C).
> is set as the set temperature, and in the single mode, it is in a standby state for starting, and operates only in response to the operating state of the main remote controller 50, similar to when the main remote controller takes priority in the multi mode described above. The display control unit 35 controls each lamp of each remote controller 50, 60 in three types: on, off, and blinking based on the information of the selected remote controller and the combustion information detected by the flame rod 15, depending on the respective operating conditions. A control signal for controlling each of these is sent to the remote control drive circuits 40 and 40a, respectively.

Prior to explaining the control contents of the display control section 35, the remote control drive circuits 40, 40 controlled by the display control section 35 will be described.
Let us explain the configuration of a. In the remote control drive circuits 40 and 40a, the voltage supplied from the 5.
and is constantly supplied as a detection voltage v rent to each remote controller 50, 60 connected to each terminal 36, 38. In addition to the detection voltage V rl 31, DC voltage from an SVi source is directly applied to each terminal 36, 38 of the remote control drive circuit 40, 40a.
0 and 60, switching transistors 43 and 43a are connected to respective terminals 36 and 38 via diodes 44 and 44a. Further, in order to directly supply DC voltage from a 12V power supply (not shown) to each remote controller 50, 60, a switching transistor 4 is provided.
5, 45a are connected to each terminal 36, 38. Note that switching transistors 46 and 46a are provided before the transistors 45 and 45a, and each transistor 43, 43a, 46, and 46a is connected to the display control unit 35.
Each is controlled by In the remote control drive circuit 40, the switching transistors 43 and 45 apply their respective voltages to the terminal 36 only when turned on by the control signal, and when both the transistors 43 and 45 are turned off, the switching transistors 43 and 45 apply voltages from the 5V power supply. Only the voltage of g. Resistance 4 as vre garden
2 to terminal 36. When the transistor 43 that directly supplies power from the 5V power supply and the transistor 45 that directly supplies power from the 12V power supply are both off, the detection voltage v rem from the 5V power supply is controlled by the variable resistance circuit in the main remote controller 50. A voltage is applied to a series circuit consisting of a parallel circuit of 51 and operation switch circuit 52 and a resistor 42, and a divided voltage corresponding to the combined resistance is applied to the terminal 36 according to the operating state of the variable resistance circuit 51 in the main remote control 50. Terminal voltage ■,
. It appears as . Similarly to the remote control drive circuit 40, when the respective voltages are applied to the remote control drive circuit 40a and both the transistors 43a and 45a are off, the terminal 3
8, a voltage corresponding to the operating state of the remote controller 60 appears as a terminal voltage V(, o. In the display control unit 35, each remote controller 50, 60 is connected via the remote controller drive circuit 40, 40a configured as described above. is controlled according to the control state of the sequence control unit 31. The lighting, blinking, and extinguishing of each lamp is controlled depending on the operating state of the gas water heater 1, such as whether it is in a standby state or not, and whether it is in combustion mode. A separate display is performed for each remote controller 5o, 6o depending on whether or not an abnormality has occurred, and depending on whether the remote controller is in a priority state. Regardless of priority or non-priority, when a flame is detected by the flame rod 15, it lights up continuously to indicate that combustion is in progress, and in the case of an ignition error or a misfire during combustion, it blinks to indicate an abnormality detection state. 2. During operation standby and combustion, L4 lights up on the priority remote controller, blinks on the non-priority remote controller if it is the main remote controller 50, and lights up on the sub remote controller. 60, it lights up.Furthermore, when an abnormality occurs, it does not light up and turns off, regardless of priority or non-priority.The priority lamp L5 in the sub remote controller 60 is a sub-remote controller whose priority switch SW2 and display switch SW3 are closed. Only when the remote control 60 is prioritized, it lights up or blinks in response to the lighting of the operation lamp L4 or the blinking of the combustion lamp L3.The relationship between the display state on each remote control 50, 6o and the operation state of the gas water heater 1 is They are summarized in Table 1.

From Table 1 onwards, the control of the remote control drive circuit 40 by the display control section 35 will be explained. Note that the remote control drive circuit 40a is written as ``C'' in parentheses 0. ■Operation without lighting the combustion lamp Ll (L3). 2 (L4), turn on the transistor 45 (45a) and turn on the transistor 1 as shown in FIG.
It supplies electricity from a 2V power supply almost continuously.

In this case, since the set temperature signal is too low for the remote controller that receives this control, the power supply from the 12V power supply is stopped for a short period of time, and only the detection voltage v rein is supplied from the power supply. The time for which the data is displayed is set at intervals of 30 mS, each being BmS.

■Operation lamp L without lighting combustion run 7LL (L3)
2 (L4) only, turn on and off the transistor 45 (45a) according to the blinking cycle.
As shown in Figure 8, power is supplied intermittently from a 12V power supply. At this time, the blinking cycle is, for example, 2.7 seconds.
On, 2.7 seconds off. ■ Combustion lamp Ll (L3) and operation lamp L72 (
When both transistors L4) are turned on, the transistor 43
<43a) is turned on to continuously supply power from the 5V power supply, and the transistor 45 (45a) is controlled to turn on for 5 mS and for 5 mS with continuous constant pulses with a pulse period of 10 mS, for example. 12V was converted into a pulse as shown in Figure 9.
The power from the power supply is supplied in combination with the power from the 5V power supply. In this case as well, the time during which both the power from the 5V power supply and the power from the 12V power supply are stopped and only the detection voltage Vre is supplied is 30mSI'W in BmS increments! They are located at intervals. ■When only the combustion lamp LL (L3) is lit continuously and the operation lamp L2 (L4) is blinked,
For example, as shown in FIG. As shown in
The power from the 5V power supply is controlled to vary according to the blinking cycle.

■If you want to blink only the combustion lamp LL (L3) without lighting the operation lamp L2 (L4), turn off the transistor 43 (43a>) and stop the power from the 5V power supply. As shown, pulse period 10m
Power from a 12V electric wire converted into continuous constant pulses of S is supplied intermittently according to a blinking cycle in which, for example, lsec is turned on and Isec is turned off. 5 ■ Transistor 43 that directly supplies power from the power supply
(43a>) and the transistor 45 (45a) for directly supplying power from the 12V power supply are both off, and when only the detection voltage ~rram from the 5V power supply is continuously supplied, the combustion lamp L , 1 (L3) and the operation lamp L2 (L4>) do not light up.In addition, in each of the above cases, even if each lamp is lit or flashing, the remote control 50
In order to be able to read the operating state of (60), as in case (2), the time during which only the detection voltage v rem from the 5V1t source is supplied is increased by 3 mS each time.
It is set to be silent for 0mS. In this case, since the time during which only the detection voltage v ram is supplied is a very short time of 3 mS, each lamp can be lit and blinked without any visual problem. Note that in the sequence control section 31 described above, the terminal 36
, 37 is detected as a short circuit detection voltage of 0.05 V or less, each transistor 43, 45 in the remote control drive circuit 40 is not turned on in order to protect each transistor 43, 45 from damage etc. Similarly, the short circuit detection voltage between terminals 38 and 39 is 0.0.
If 5V or less is detected, the remote control drive circuit 40
The power supply by each transistor 43a, 45a in a is stopped.

Furthermore, when the operation switch SWI is closed,
The sequence control unit 31 does not accept a closing operation for which the predetermined time t1 has not passed. Therefore, in the control of the remote control drive circuit 40 by the display control unit 35, if the operation switch SWI is repeatedly closed, the sequence l! According to the operation change between the start standby state and the operation standby state by the J control unit 31, the transistor 45 (45a>) is not turned on or off until at least a predetermined time t1 has elapsed.

Therefore, 12V1! Since the electric power supplied from the source does not act on the combustion lamp circuit 56 (66) as a voltage having an alternating current component, the electric power supplied from the combustion lamp circuit 56 (66)
) will not light up accidentally. In the water amount control section 34,
Based on the temperature information detected by the outlet hot water temperature thermistor 25, the electric water flow control device 118 is controlled to restrict the flow rate exceeding the heating capacity from passing through the heat exchanger l3. Next, the operation of the gas water heater 1 according to the present embodiment, which has the above configuration, will be explained in the multi-mode case with reference to FIG. 12. If the operation switch SWI of the main remote controller 50 is operated and detected as an operation signal when the control unit 30 is connected to the power line and is in the startup standby state (YES in step 1), the priority switch is activated as the operation standby state. SW
The operating lamp of the selected remote controller lights up according to the setting state of step 2, and the operating lamp of the non-priority remote controller lights up or flashes (step 2). At this time, if the sub remote control 60 is selected, the priority lamp L5 lights up together with the operation lamp L4. At this time, as shown in Figure 7, only the detection voltage Vreso is applied to the selected remote control at a predetermined period, and while each lamp is lit or flashing, the user When the hot water temperature is set using the variable resistance circuit of the selected remote control, the terminal voltage corresponding to the resistance value of the variable resistance circuit is read as a set temperature signal (step 3).
).

At this time, a detected temperature signal is also read from the outlet hot water temperature thermistor 25, and the fuel #lM is determined using these as heating information.

Thereafter, a hot water tap (not shown) is opened, water flow inside the thermographic clamp is detected (YES in STEG 4), and ignition Ill control is performed in a predetermined sequence (Step 5).
Combustion begins.

At this time, the blower 12 and the governor proportional valve 23 are controlled based on the already determined combustion amount, and combustion is started with a combustion output corresponding to the set temperature. If ignition is detected (YES in step 6). The combustion lamps on each remote control will light up (step 7). At this time, if ignition is not detected within the predetermined time (NO in step 6), the operation lamp is turned off and the combustion lamp is blinked (step 8). After this, the combustion lamp continues to blink until the off signal is not given by the operation switch SW1 (No in step 9), and when the operation switch SW1 is operated and the off signal is given (YES in step 9), The combustion lamp goes out (step 10). Also, if a misfire is detected during combustion (YES in step 11), the process moves to step 8 and subsequent steps. After ignition is detected, no misfire is detected (NO in step 11). Also, if water flow is not stopped (step 1)
(NO in 2). After repeating steps 7 onwards, the set temperature and outlet temperature are constantly read at predetermined intervals, and the combustion amount is determined accordingly. When water flow is stopped (YES in step 12),
Combustion is stopped and the combustion lamp is extinguished (
Step 13). After that, if the off signal is not given by the operation switch SW1 (NO in step 14). The machine moves to step 2 and enters the standby state again. After combustion is stopped, when an off signal is given by operation switch SW1 (YES in switch SW1)
), the operation lamp is turned off (Steg l5). The operation switch operation detection in step 1, step 9, and step 14 described above is performed as follows, as shown in FIG. When the operation switch SWI is closed (YES in step 20), the operation of the operation switch SWI is detected (step 21) regardless of whether it is in the startup standby state or the operation standby state, and the operation is continued for a predetermined time t1. (Step 22). If the clocking time has exceeded the predetermined time t1 (YES in Step 23), Step 2
0, and it is determined whether the operation switch SWI is to be closed again. If the predetermined time t1 has not elapsed since the start of time measurement (No in step 23), the process waits until the predetermined time lfntl has elapsed and does not proceed to step 20.
Therefore, there is no need to determine whether or not the operation switch SWI has been closed. Note that if there is no operation to close the operation switch SWI, if No in step 20, the process remains on standby and waits for the operation switch SWI to be closed.
Note that if an instruction to start operation is not given by the operation switch SWI (NO in step 1), combustion will not start even if water is supplied. As described above, in this embodiment, when the operation switch is closed, unless the predetermined time t1 or more has elapsed,
It is assumed that the switch is not operated no matter how many times it is closed within the predetermined time t1 because the switch is not detected to have been closed.
No changes are made to the operating state, and the operation continues as it is. Therefore, even if the operation switch is repeatedly closed rM in the operation standby state, once the power for lighting the operation lamp is stopped again by the first closing operation, the operation will continue until the predetermined time t1 has elapsed. Since the power for lighting the operating lamp is not supplied, the voltage of the electricity for lighting the operating lamp does not change when the operation switch is closed, so the combustion lamp will not be lit by a false signal. In this embodiment, operation is stabilized by not accepting repeated closing operations of the operating switch SWI within a predetermined time tl, thereby eliminating erroneous lighting of the combustion lamp. By providing a delay circuit that receives the information and delays the supply of driving power for the operating lamp by a predetermined time ffl t 1 after receiving information about the supply, erroneous lighting of the combustion lamp during standby can be prevented. You can also eliminate it.
In this embodiment, water flow is detected by a water flow switch, but water flow may also be detected by a flow detection signal from a flow rate sensor. In the above embodiments, a gas water heater is shown, but a water heater equipped with a combustor that uses other fuels such as petroleum, or a water heater that uses electric heating may also be used, and the device is not limited to a water heater. It may be an air conditioner or the like as long as it is a control device for equipment in which a display element is provided in the operation section.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the functional configuration of the control device for the gas water heater of this embodiment, Fig. 2 is a schematic configuration diagram showing the gas water heater of this embodiment, and Fig. 3 shows the main remote control of this embodiment. 4 is a circuit diagram showing the sub-remote controller of this embodiment, FIG. 5 is a voltage explanatory diagram showing the discrimination voltage regarding the main remote controller in the control device of this embodiment, and FIG. 6 is a circuit diagram showing the sub-remote controller of this embodiment. Figures 7 to 11 are voltage waveform diagrams for lighting the lamps of each remote controller, and Figure 12 shows the operation of the gas water heater of this embodiment. FIG. 13 is a flowchart showing the operation in detecting operation switch operation. In the figure, 1... gas water heater (equipment), 30... control device (control unit), 50... main remote control (operation unit),
51... Variable resistance circuit, 52... Switch circuit, S
W1... Operation switch (normally open type switch), 56...
- Combustion lamp circuit (display circuit). 40A, 40B...
Electric wire (2 wires).

Claims (1)

[Claims] 1) A variable resistance circuit for setting a control target value, a first display circuit that displays according to a predetermined alternating current component in the supply voltage, and a display when the effective voltage of the supply voltage is equal to or higher than the predetermined voltage. an operation unit comprising a switch circuit including a second display circuit and a normally open switch, and in which the variable resistance circuit, the first display circuit, the second display circuit, and the switch circuit are connected in parallel; The device is connected to the operating unit by two electric wires, supplies a voltage with a constant voltage direction to the operating unit, and starts operating the device in response to a closing operation of the normally open switch while the device is stopped. In addition to supplying a predetermined voltage for displaying by the second display circuit, when the device is in operation, the operation of the device and the second display circuit are performed according to the closing operation of the normally open switch. In a device control device comprising a control unit that stops supplying a predetermined voltage for displaying, the control unit controls whether the normally open switch is closed for a predetermined period of time after the operation of the device is stopped. A control device for equipment, characterized in that the predetermined voltage for performing a display by the second display circuit is not supplied to the operation unit even when the second display circuit is in use.