JPH08237775A - Power control system - Google Patents

Abstract

PURPOSE: To devise the system so that a control panel and a supervisory panel are interconnected easily with a 2-wire line. CONSTITUTION: A terminal equipment 5g connecting to an electromagnetic contactor M controlling a power source, and terminal equipments 5d, 5e each provided with a switch used to control On and OFF contacts of the contactor M of the terminal equipment 5g are connected to a transmission unit 4 through 2-wire signal lines 6. The transmission unit 4 adopts the time division multiplex system to send information to each of the terminal equipments 5d, 5e, 5g and the electromagnetic contactor M is controlled by the operation of each switch. The terminal equipments 5d, 5e are contained in a supervisory panel 3, and the terminal equipment 5g is contained in a control panel 2 in the vicinity of the power source, then the control panel 2 and the supervisory panel 3 are connected by the 2-wire signal lines 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power control system for controlling a pump motor used in a water supply system.

[0002]

2. Description of the Related Art Conventionally, a power control system for controlling a large number of power sources such as a pump motor for pumping water to an elevated water tank and monitoring the operating state of each power source has been used in an apartment house or the like. Has been adopted. This type of power control system operates with respect to the power source 1 as shown in FIG.
While controlling the stop, the power source 1 and the system state in which a change occurs due to the power source 1 (for example, in the water supply system, the water level in the water tank or the pressure of the water supply channel) or abnormalities are monitored to control the power source 1. A control panel 2 is provided. In addition, the control panel 2 is arranged relatively close to the power source 1, and the control panel 2
Has a function of notifying the above-mentioned state or abnormality to a monitor panel 3 arranged in a different place (administrator room etc.), and the monitor panel 3 monitors the power source 1 by the notification from the control panel 2. At the same time, if necessary, a command is sent to the control panel 2 to control the operation / stop of the power source 1. That is, as shown in FIG. 9, the control panel 2 receives the contact output from the monitoring panel 3 and operates / stops the power source 1, and the state of the power source 1 or the system including the power source 1. A monitoring unit 22 for detecting an abnormality, controlling the power source 1 and notifying the monitoring panel 3 is provided. Here, since the contact output is sent from the monitoring panel 3 to the control unit 21, at least two wirings 23 are required for each power source 1 between the control panel 2 and the monitoring panel 3. There is.

On the other hand, conventionally, in order to control an electric motor used for opening and closing a shutter, as shown in FIG. 10, a plurality of terminals 5a, 5b are provided to a transmission unit 4 via a two-wire type signal line 6. There is provided a remote monitoring control system for branching and connecting and transmitting information between the transmission unit 4 and each of the terminals 5a and 5b by a time division multiplex transmission system. In this type of remote monitoring control system, an address is given to each terminal 5a, 5b, and a switch 11 is attached to each terminal 5.
The sensor 12, the electric motor 13, the indicator lamp 14, etc. are connected in advance, and the switch 11 and the sensor 1 are connected depending on the address relationship.
2, the electric motor 13, the indicator light 14 and the like are coupled to each other. For example, if the switch 11 connected to the terminal device 5a is operated, the operation information of the switch 11 is transmitted via the transmission unit 4 to the other terminal device 5b having the correspondence set by the address, and the operation information of the switch 11 is transmitted. If the electric motor 13 is connected to the terminal device 5b that has received, the electric motor 13 is controlled. Further, when the position information of the shutter opened and closed by the electric motor 13 is detected by the sensor (here, the limit switch) 12, the information is sent from the terminal 5b and transmitted to the terminal 5a via the transmission unit 4. With terminal 5
The information is displayed by the indicator lamp 14 provided in b. The terminal 5b to which the electric motor 13 is connected is housed in the relay board 7 together with the transmission unit 4.

Further, in the same manner as the above-mentioned control of the electric motor, in order to control the lighting load to be turned on and off at a distant place, a plurality of terminals are provided to the transmission unit via a two-wire signal line. There is also provided a remote monitoring control system in which a switch is branched and connected, and each terminal is connected with a switch, a lighting load, and an indicator light for indicating whether the lighting load is on or off. In this type of remote monitoring and control system, as shown in FIG. 8, a lighting control panel 8 in which a large number of terminals equipped with switches and indicator lights are centrally arranged is provided, and a lighting load L is connected to a relay panel 7. By housing the terminal device and the transmission unit, the lighting load L can be centrally managed. If such a remote monitoring control system is used to manage the lighting load L in a tenant building and the lighting control panel 8 monitors whether the lighting load L is turned on or off, the lighting load L is forgotten to be managed. can do.

[0005]

As described above, the conventional power control system requires at least two wires 23 for each power source 1 between the control panel 2 and the monitoring panel 3. , Control panel 2 and monitoring panel 3 that are located in different places
Since a large number of wirings 23 are required between the wirings, it becomes difficult to understand the connection relationship, and the cost burden required for the wirings 23 becomes large. Further, as shown in FIG. 8, it is necessary to provide a power control system in addition to the remote monitoring control system for centrally managing the lighting load L.
It is inconvenient because the monitoring panel 3 and the lighting control panel 8 are required separately.

On the other hand, the transmission unit 4 and the terminal 5 used in the remote monitoring control system for controlling the electric motor.
a and 5b, the transmission unit 4 and the terminal 5b are housed in the control panel 2, the power source 1 is controlled by the terminal 5b, the terminal 5a is housed in the monitoring panel 3, and the terminal 5a is switched. It is conceivable to provide or an indicator lamp to control and monitor the power source 1. However, the remote monitoring control system for controlling the electric motor does not allow the electric motor to rotate normally, reversely, or stop (that is,
It is configured to instruct opening, closing, and stopping), and the power control system only requires operation and stopping of the power source 1, which is inconvenient for diversion.

Particularly, in the electric motor control, three kinds of instructions of forward rotation, reverse rotation and stop are given to one electric motor. Therefore, as shown in FIG. 10, the terminal 5b has three kinds of terminals of open, closed and stopped. Although it has Ta, Tb, Tc and a common terminal Td,
If this terminal device 5b is diverted to power control, an electromagnetic contactor is connected between each terminal Ta, Tb, Tc and the common terminal Td, and a total of three electromagnetic contactors operate the power source 1 respectively.・ Stop will be controlled. Therefore,
Since the three wires are concentrated on the common terminal Td, the wiring work becomes troublesome.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a dedicated terminal device for controlling a power source by using a two-wire system between a control panel and a monitoring panel. An object of the present invention is to provide a power control system that can be easily wired and can centrally manage a power source with the same system as a lighting load.

[0009]

According to a first aspect of the present invention, a plurality of terminals each having an address set individually are branched and connected to a transmission unit via a two-wire signal line, and the transmission unit includes address data. The transmission unit sends the transmission signal to the signal line by the time division multiplexing transmission method to access each terminal individually, and the transmission unit transmits the monitoring data generated by any one of the terminals during the signal return period set in synchronization with the transmission signal. When received, the control data is generated based on the monitoring data, and the control unit transmits the control data to the other terminal device in which the correspondence between the terminal device that generated the monitoring data and the address is preset, and the terminal device is transmitted. It is a system that controls the load connected to the power source and is housed in a control panel that is equipped with a switch for instructing on / off of the power source A first terminal device, and an electromagnetic contactor as a load having a contact inserted between a power source and a power source, which is controlled in accordance with an instruction of the switch, to a monitoring panel arranged near the power source. And a second terminal to be stored.

According to a second aspect of the present invention, a second terminal includes an on-contact, which is a normally open contact, and an off-contact, which is a normally-closed contact, and each of the on-contact and the off-contact is individually provided. It is characterized by having a connected terminal. According to a third aspect of the present invention, the first terminal unit is provided with an indicator lamp for receiving the control data for instructing the ON display and performing the ON display, and the second terminal unit is a contact which is turned ON when the power source is activated. It is characterized in that a monitor terminal to which an input is connected is provided and monitoring data for instructing the on-display of the indicator lamp is sent when the contact input is turned on.

According to a fourth aspect of the present invention, a third terminal unit is provided which is equipped with an indicator lamp for receiving the control data for instructing the ON display and performing the ON display, and is housed in the monitoring panel. The present invention is characterized in that a monitor terminal to which a contact input that is turned on when the power source is activated is provided, and monitoring data that directs the on-display of the indicator lamp is sent when the contact input is turned on.

[0012]

According to the structure of the invention of claim 1, a switch for instructing on / off of the power source and an electromagnetic contactor for turning on / off a contact inserted between the power source and the power source are separately provided. The operation of the switch and the operation of the electromagnetic contactor are associated with each other by the transmission signal transmitted by the time-division multiplex transmission method. By storing the terminal device to which the contactor is connected and storing the terminal device equipped with a switch in the monitoring panel that is placed at a different location from the control panel, the wiring between the control panel and the monitoring panel can be two lines. It is possible to use a signal line of a formula, which facilitates wiring work. Moreover, since the number of wirings is small, the cost required for wiring is also reduced.

According to the second aspect of the invention, the second terminal is provided with the on-contact and the off-contact, and the respective ends of the on-contact and the off-contact are provided with separate terminals. As a result, the work of connecting with the electromagnetic contactor becomes easier than the case where the terminal provided collectively is provided. According to the configuration of the inventions of claims 3 to 4, the terminal device housed in the monitoring panel is provided with the indicator lamp, and in the terminal device housed in the control panel, the contact input connected to the monitor terminal is the power source. When it is turned on during operation, it instructs to turn on the indicator light, so the indicator light is turned on while the power source is operating, and the operation of the power source and the display state of the indicator light match. The power source can be managed from a distance.

[0014]

EXAMPLE This example shows an example in which a pump motor for pumping water to an elevated water tank 9 as shown in FIG. 2 is used as a power source 1, and is basically configured as shown in FIGS. 1 and 2. . That is, a plurality of types of terminals 5c to 5h are connected to the transmission unit 4 via the two-wire signal line 6. Each terminal 5c ~
An individual address is set in 5h, and the transmission unit 4 individually recognizes the terminals 5c to 5h by using this address.

The transmission unit 4 sends the transmission signal Vs having the format shown in FIGS. 3A and 3B to the signal line 6. That is, the transmission signal Vs includes a start pulse ST indicating the start of signal transmission, a mode data signal MD indicating the signal mode, an address data signal AD for transmitting address data for individually calling the terminals 5c to 5h, and lighting serving as a load. Time for receiving the load L, electromagnetic contactor M, control data signal CD for transmitting control data for controlling the indicator light, checksum data signal CS for detecting a transmission error, and return data signal from the terminals 5c-5h. Bipolarity (± 24 consisting of signal return period WT which is a slot)
V) is a time division multiplexed signal, and data is transmitted by pulse width modulation. Here, the electromagnetic contactor M has a contact (not shown) inserted between the power source 1 and the power source, and the power source 1 is operated / stopped in accordance with opening / closing of the contact of the electromagnetic contactor M. Is done.

In each of the terminals 5c to 5h, when the address data transmitted by the transmission signal Vs received via the signal line 6 matches the preset address data, the control data is fetched from the transmission signal Vs and The return data is returned as a current mode signal (a signal that is sent by short-circuiting the lines of the signal line 6 via an appropriate low impedance) in synchronization with the signal return period WT of the transmission signal Vs.

Further, the transmission unit 4 is provided with dummy signal transmitting means and interrupt signal processing means.
The dummy signal transmitting means always sends out a dummy transmission signal in which the mode data signal MD is in the dummy mode. Further, the interrupt signal processing means, when any of the terminal devices 5c to 5h receives the interrupt signal Vi as shown in FIG. 3C generated due to a request for information transmission, the terminal which generated the interrupt signal Vi. The devices 5c to 5h are searched, and the address data set in the terminal device 5c or the like 5h is returned as reply data. That is, the dummy signal transmitting means always sends the dummy transmission signal to the signal line 6, and the terminal 5c
When the interrupt signal Vi generated from ~ 5h is detected in synchronization with the start pulse signal ST of the dummy transmission signal, the transmission signal from the transmission unit 4 is the transmission signal Vs in which the mode data signal MD is set to the address confirmation mode by the interrupt processing means. Send to. In each of the terminals 5c to 5h, an interrupt flag for requesting an interrupt when the interrupt signal Vi is generated is set, and in the terminals 5c to 5h in which the interrupt flag is set, the mode data signal MD is the transmission signal Vs of the address confirmation mode. Is received, this transmission signal Vs
The address data set in the terminals 5c to 5h are returned as reply data in synchronization with the signal returning period WT of. Thus, in the transmission unit 4, the interrupt signal V
The addresses of the terminals 5c to 5h which generated i can be acquired.

In the transmission unit 4, when the addresses of the terminals 5c to 5h which generate the interrupt signal Vi are obtained, the control data to be transmitted to the terminals 5c to 5h having a correspondence relationship preset by the address is generated, and at the same time, The transmission signal Vs including the control data is sent to the signal line 6, and the control data is transmitted to the corresponding terminals 5c to 5h to control the load.

In each of the terminals 5c to 5h, the transmission signal Vs transmitted through the signal line 6 is full-wave rectified and stabilized to obtain a power source for operating the internal circuit. However, in the terminals 5g and 5h to which the lighting load L and the electromagnetic contactor M are connected, a power supply AC for driving the lighting load L and the electromagnetic contactor M is separately provided. A commercial power source is generally used as the power source AC.

The transmission unit 4, the terminal 5f equipped with a switch for instructing the lighting load L to be turned on and off, and the terminal 5h equipped with a relay Ry for controlling the lighting load L to be turned on and off are conventionally known. The description is omitted. In addition, the terminals 5d and 5e and the terminals 5g, each of which has a switch having a corresponding relationship with the terminal 5g for controlling the electromagnetic contactor M,
The terminal device 5c equipped with a display lamp for performing a display corresponding to the contact input to the terminal device 5c has the same basic configuration as the terminal device 5f equipped with a switch used for controlling the lighting load L, and therefore the description thereof will be omitted. However, the terminal device 5d is used only for the operation of turning on the contact of the electromagnetic contactor M, and the terminal device 5e is used only for the operation of turning off the contact of the electromagnetic contactor M.
That is, if the switch of the terminal 5d is operated, the control data of ON is transmitted to the terminal 5, and if the switch of the terminal 5d is operated, the control of OFF is transmitted to the terminal 5g.

Next, the terminal 5g will be specifically described. Terminal unit 5g is ON contact r ₁ is a normally open contact, the normally closed contact and a clear contact r ₂ is a point, on the contact r ₁ and OFF contact r ₂ and the corresponding terminal T ₁ in pairs by ~T ₄ and a pair of monitor terminals T ₅ and T ₆ for receiving a contact input x from the outside. The electromagnetic contactor M includes a contact y that works in conjunction with a contact that opens and closes a power source to the power source 1, and the contact y is connected between both ends of the on-contact r ₁ . Further, a series circuit of the contact y, the coil of the electromagnetic contactor M, and the power supply AC is connected between both ends of the off contact r ₂ .

Therefore, when the on-contact r ₁ is turned on by operating the switch of the terminal 5d, the coil of the electromagnetic contactor M is energized from the power source AC through the off-contact r ₂ and the on-contact r ₁ to turn on the contact y. . After that, even if the on-contact r ₁ is turned off, the coil of the electromagnetic contactor M is energized from the power supply AC through the off-contact r ₂ and the contact y, so that the electromagnetic contactor M is self-held. In this state, the power source 1 such as a pump motor is energized to drive the power source 1. Here, the on-contact r ₁ is controlled so as to be turned off after a certain period of time.

On the other hand, when the off contact r ₂ is turned off by operating the switch of the terminal 5e, the power supply from the power source AC to the coil of the electromagnetic contactor M is cut off, and the on contact r ₁ is turned off by this point. Therefore, the contact y of the electromagnetic contactor M is turned off. That is, the power supply to the power source 1 is also stopped and the power source 1 is stopped. Here, the OFF contact r ₂ is also controlled to return to the ON state after a certain time has passed after the OFF contact r ₂ . In short, both the on contact r ₁ and the off contact r ₂ perform a one-shot operation.

In order to enable such operation, the terminal
The container 5g has a structure as shown in FIG. On in Figure 4
Contact point r₁And off contact r₂And a spare contact point r₃Provided
And has a common configuration for all the terminals 5c to 5h.
The terminal module 20 that is₁, Off contact
r₂, Spare contact r₃Latching to open and close each
Ray Ry₁~ Ry₃Set coil SC₁~ SC₃And
And reset coil RC ₁~ RC₃Are connected. Forecast
Binary contact r₃Is the on contact r₁Functions as a normally open contact
Is controlled to₃A pair of ends on both ends of
Child T₇, T₈Are connected.

On the other hand, the monitor terminals T ₅ and T ₆ are inserted between the smoothing capacitor C ₁ and the light emitting element of the photocoupler PC, and the contact input x connected to the monitor terminals T ₅ and T ₆ is applied. When turned on, the light receiving element of the photocoupler PC is turned on, and this on output is input to the terminal module 20. The smoothing capacitor C ₁ smoothes the DC power source obtained by rectifying the transmission signal Vs, which is a bipolar signal, by the rectifier RE such as a diode bridge. Also,
Auxiliary contacts r ₁₁ , r are provided for the ON contact r ₁ and the auxiliary contact r _3.
31 is provided, and both auxiliary contacts r ₁₁ and r ₃₁ are connected to the terminal module 20. Further, the terminal module 20 is connected with a reception display circuit 31 including a light emitting diode LL that lights up when the on contact r ₁ is turned on.

As shown in FIG. 5, the terminal module 20 includes a signal processing circuit 21 which is a dedicated integrated circuit containing a microcomputer. Here, the numbers attached to the terminals in FIG. 5 correspond to the numbers of the terminals of the terminal module 20 in FIG. The signal processing circuit 21 includes a reception circuit 22, a return circuit 23, and a power supply circuit 24 between a pair of terminals SIG (t ₁ , t ₂ ) connected to the signal line 6. The reception circuit 22 converts the bipolar transmission signal Vs into a unipolar signal, and the return circuit 23 flows to the signal line 6 depending on whether the signal lines 6 are open or short-circuited via a low resistance. The current is changed and a binary signal in the current mode is output. Further, in the power supply circuit 24, the transmission signal Vs is full-wave rectified by the rectifier circuit DB formed of a diode bridge to obtain a constant voltage to obtain an internal power supply. Here, the rectifier circuit DB also has a function of depolarizing the connection between the terminal 5g and the signal line 6 by being inserted also between the receiving circuit 22 and the return circuit 23 and the signal line 6.

Address data unique to the terminal 5g is stored in the data memory 25 composed of an EEPROM. The address data written in the data memory 25 can be exchanged with an external device by an optical wireless signal using infrared rays through an address receiving circuit 26 including a light receiving element LR and an address transmitting circuit 27 including a light emitting element LE. That is, it is possible to write, correct, and confirm the address data using the optical wireless signal.

Further, the signal processing circuit 21 is provided with a plurality of terminals for generating a one-shot output (an output which becomes active only for a short time) according to the control data received through the signal line 6, and each terminal is connected through the inverting circuit 28 to the above-mentioned terminals. Latching relays Ry _{1 to} Ry ₃ set coils SC _{1 to} SC
It is adapted to be connected to a _three and a reset coil RC ₁ to RC _3. Further, the signal processing circuit 21 is also connected to a vibrator 29 for generating a clock signal and a reset circuit section 30 for resetting at the start of operation.

By the way, the above-mentioned terminal module 20
The other terminals 5c to 5f and 5h also have the same configuration, and by using common parts, the equipment cost for the manufacturing equipment and the management cost at the time of inventory are reduced. Therefore, in this type of remote monitoring and control system, red and green are usually displayed on the terminal device on the operating side so that it is possible to know whether the load is turned on or off by operating the switch on the operating side. The two color light emitting diodes are used as an indicator light so that the red light is turned on when the load is turned on and the green light is turned on when the load is turned off (in the terminal module 20 used for the indicator light, the functional data is stored in the data memory 25). By writing, the output does not become a one-shot operation so that the output can be obtained continuously.

Here, in the terminal module 20, by assigning a 2-bit load number to one address, four switches can be identified, and four switches can be identified.
It is configured so that each load can be controlled individually. That is, each of the four monitoring input terminals IN of the terminal module 20
If a switch is connected between 0 to IN3 and the ground terminal GND, ON / OFF information can be transmitted individually for each switch, and eight control output terminals OUT0 to OUT7 form two pairs each. Generate different types of output individually. The pair of control output terminals OUT0 to OUT7 is an output corresponding to ON when one is an output corresponding to ON (that is, the control output terminals OUT0 to OUT7 output two values and become a pair). One is a non-inverted output and the other is an inverted output).

Therefore, the control output terminals OUT0 to OUT0 on the operating side
Out of the pair of OUT7, connect the red light emitting indicator light to the one that becomes active when there is an on instruction, and connect the green light emitting indicator light to the one that becomes active when there is an off instruction. If connected, it is possible for the operated side to turn on red when turned on and to turn on green when turned off.

By the way, in the motor control system described as the conventional example, as shown in FIG. 7, the collector-emitter of the switching transistor Q is connected between the monitoring input terminal IN3 of the terminal module 20 and the ground terminal GND. , The base of the transistor Q is connected to the connection point of the pair of resistors R ₁ and R ₂ connected between the power supply terminal 24V of the terminal module 20 and the ground terminal GND, and the light receiving element of the photocoupler PC is connected to the resistor R _2. Are connected in parallel. On the other hand, the contact input x connected to the monitor terminals T ₅ and T ₆ is turned on when the shutter or the like driven by the electric motor as the load is closed.

As described above, during the period when the load operates,
The indicator light is turned on (for example, lights up in red)
Therefore, in the motor control system, the monitor terminal
T_Five, T ₆When the contact input x to the
It is necessary to indicate that the light is off. Therefore,
In the motor control system, transistor Q and resistance
R₁, R₂By providing the contact input x on / off
The logic of the input to the monitoring input terminal IN3 is inverted.
Of. That is, when the contact input x is on, the operated side
Then, the transistor Q is turned off and it is turned off on the operating side.
Shown, when the contact input x is off
Is turned on, and the operation side also displays on.
It The contact input x turns off when the motor is operating
Since it indicates that the camera is opening,
This correspondence is sufficient in the motive control system.

However, the configuration of the electric motor control system as described above cannot be adopted in the power control, and the display is the same as when the lighting load L is turned on / off. That is, the contact input x is in a state in which it is necessary to operate the power source 1 in power control (for example, if the pump motor that supplies water to the elevated water tank 9 is the power source 1 as shown in FIG. 2, the water level in the elevated water tank 9 is When the power source 1 is turned on when the power source 1 is turned on below a predetermined value), it is required to display the on state during the operation of the power source 1 unlike the electric motor control system. Therefore, as shown in FIG. 4, when the contact input x is turned on, the light receiving element of the photocoupler PC is turned on, and the monitoring input terminal IN3 and the ground terminal GND are short-circuited, an indication of ON ( For example, the red indicator light is turned on). In short, the transistor Q and the resistors R ₁ and R ₂ in the motor control system
Becomes unnecessary.

Actually, the operating state of the power source 1 (that is, ON / OFF of the contact input x) is displayed on the terminal 5c equipped with an indicator light, and the operating state of the power source 1 (when the contact input x is ON) is displayed. The indicator light is turned on, and the indicator light is turned off while the power source 1 is stopped (when the contact input x is off). in this way,
Since it is possible to match the operating state of the power source 1 with the lighting / extinguishing state of the indicator lamp, the power source 1 can be remotely operated by observing the lighting / extinguishing state of the indicator lamp.

Further, since the auxiliary contacts r ₁₁ and r ₃₁ are respectively inserted between the monitoring input terminals IN0 and IN2 of the terminal module 20 and the ground terminal GND, the on / off of the on contact r ₁ and the spare contact r are performed. On / off of ₃ can also be notified to the terminal device on the operating side. That is,
If either the on contact r ₁ or the spare contact r ₃ is turned on, the corresponding indicator lamp on the operating side displays on (red light emission or lighting of the indicator lamp), and if it is off, it indicates off ( The red light is emitted or the indicator lamp is turned off).
Here, as described above, the indicator lamp may be incorporated in the switch terminal device without providing the indicator lamp dedicated terminal device 5c.

The terminal 5g described above is as shown in FIG.
It is installed in a case 40 of the distribution board agreement size. This case
40 is a body 41 that opens upward and an opening of the body 41.
The cover 42, which is connected to the mouth side, is connected with the assembly screw 43.
The case 40 has the above-mentioned circuit portion inside.
Two circuits mounted and connected to each other by a tape wire 45
The road boards 44a and 44b are stored. Cover 42 side turn
The light emitting device LE, the light receiving device LR, and the receiving device are provided on the road substrate 44a.
The light emitting diode LL of the display circuit 31 is mounted. circuit
The board 44a is connected to the cover 42 by a fixing screw 46.
Then, a name plate 47 is attached to the upper surface of the cover 42. Toko
The cover 42 has a terminal screw on one side of the upper surface.
Terminal T₁~ T_Four, T₇, T₈And monitor terminal
T_Five, T₆Are arranged in pairs of two, and the other
Terminal t with terminal screw on the side₁, T ₂Is provided
It That is, the terminal T for connecting to the electromagnetic contactor M₁~
T_FourThe two are individually provided. Cover 42
At terminal T₁~ T_Four, T₇, T ₈And monitor terminal
T_Five, T₆To the part corresponding to
The child cover 48 is attached.

As described above, the control panel 2 is provided with the terminal 5
By providing g, the control panel 2 can be connected to the monitoring panel 3 together with the relay panel 7 used in the system for controlling the lighting load L, and the monitoring panel 3 can be used for controlling the power source 1 and displaying an operation. Since the terminals 5c, 5d, 5e and the terminal 5f for controlling the lighting load L can be collectively provided, the control of the power source 1 and the lighting load L can be collectively carried out in an administrator room or the like. It can be done with one monitoring board 3.

[0039]

According to the invention of claim 1, a switch for instructing on / off of a power source and an electromagnetic contactor for turning on / off a contact inserted between the power source and a power source are separate terminals. The operation of the switch and the operation of the electromagnetic contactor are associated with each other by the transmission signal transmitted by the time-division multiplex transmission system, so that the electromagnetic contactor is installed in the control panel located near the power source. The terminal between the control panel and the monitoring panel is stored in a two-wire system by storing the terminal connected to the control panel and the terminal equipped with a switch in the monitoring panel that is placed at a different location from the control panel. Since it can be used as a signal line, there is an advantage that wiring construction is facilitated. . Moreover, since the number of wirings is small, the cost required for wiring can be reduced. Also,
By adopting this configuration, it becomes possible to share the transmission unit with the remote monitoring control system that has been conventionally provided for controlling the lighting load, and control the power source and the lighting load on the same signal line. Will be possible. That is,
One monitor panel can monitor and control the power source and the lighting load, saving space.

According to the second aspect of the present invention, the second terminal is provided with the ON contact and the OFF contact, and the terminals are provided at the respective ends of the ON contact and the OFF contact. There is an advantage that the connection work with the electromagnetic contactor is easier than the one provided with. According to the invention of claims 3 to 4, an indicator lamp is provided in the terminal unit housed in the monitoring panel, and in the terminal unit housed in the control panel, the contact input connected to the monitor terminal is turned on when the power source operates. When this happens, the display lamp is instructed to be turned on, so the display lamp is turned on during the operation of the power source, and the operation of the power source and the display state of the indicator light match. There is an advantage that it can be managed at a remote place (that is, remote monitoring and operation).

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment.

FIG. 2 is a schematic configuration diagram of an example.

FIG. 3 is a waveform diagram of a transmission signal used in the example.

FIG. 4 is a circuit diagram of a terminal used in the embodiment.

FIG. 5 is a circuit diagram of a terminal block used in the embodiment.

FIG. 6 is an exploded perspective view of a terminal used in the embodiment.

FIG. 7 is a circuit diagram of a main part of a motor control system as a comparative example.

FIG. 8 is a schematic configuration diagram of a conventional example.

FIG. 9 is a connection diagram of a control panel and a monitoring panel used in a conventional example.

FIG. 10 is a wiring diagram of a motor control system as a comparative example.

[Explanation of symbols]

1 power source 2 control panel 3 monitoring panel 4 transmission unit 5c terminal device 5d terminal device 5e terminal device 5f terminal device 5g terminal device 5h terminal device 6 signal line 7 relay panel L lighting load M electromagnetic contactor r ₁ on contact r ₂ off Contact T ₁ terminal T ₂ terminal T ₃ terminal T ₄ terminal T ₅ monitor terminal T ₆ monitor terminal x contact input

Claims (4)

[Claims] 1. A plurality of terminals each having an address set individually are branched and connected to a transmission unit via a two-wire signal line,
Send a transmission signal containing address data from the transmission unit to the signal line by time division multiplexing transmission method to access each terminal individually, and generate at any terminal during the signal return period set in synchronization with the transmission signal When the transmission unit receives the monitored data, the control unit generates control data based on the monitoring data, and the transmission unit sends the control data to the other terminal unit that has a preset correspondence relationship with the terminal unit that generated the monitoring data. It is a system that controls the load connected to the terminal device by transmitting the data, and is housed in a monitoring panel that is equipped with a switch for instructing on / off of the power source The first terminal and the electromagnetic contactor as a load having a contact inserted between the power source and the power source are controlled in accordance with the instruction of the switch, and are placed near the power source. Power control system characterized by comprising a second terminal device housed in monitoring panel being location. 2. The second terminal device comprises an ON contact, which is a normally open contact, and an OFF contact, which is a normally closed contact, and terminals individually connected to each end of the ON contact and the OFF contact. The power control system according to claim 1, further comprising: 3. The first terminal is provided with an indicator lamp for receiving the control data for instructing the on-display and performing the on-display.
7. The terminal device is provided with a monitor terminal to which a contact input that is turned on when the power source is activated is connected, and when the contact input is turned on, monitoring data for instructing the on-display of the indicator lamp is sent out. 1. The power control system according to 1. 4. A third housing housed in a monitoring panel, which is provided with an indicator lamp for performing on-display in response to control data for instructing on-display.
Is provided, and the second terminal is provided with a monitor terminal to which a contact input that is turned on when the power source is activated is connected, and sends monitoring data for instructing the on-display of the indicator light when the contact input is turned on. The power control system according to claim 1, wherein: