JPS6327932B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power control panel, and particularly to a power control panel for driving and controlling a plurality of motors that are driven in conjunction with each other, such as motors that respectively drive a pump and its discharge valve. Concerning what is suitable for

[Conventional technology]

In sewage treatment plants, multiple pumps and related equipment are controlled all at once by a central center. The driving and control of these pumps and the like is performed by remote control from a so-called control center of the same standard placed near the pumps (at the site) via the center.

FIG. 1 is a circuit diagram of a conventional power circuit relating to a main pump and its discharge valve, and FIG. 2 is a partially detailed diagram.

The example shown in Figure 1 is the main pump drive motor (IM).
This shows the case where the discharge valve drive motor (IM) is controlled. The main pump drive motor 1 is driven and controlled by a motor control center 10, but the power supply to the motor 1 is provided by a wiring cutter 1.
1, from the power line bus 3 via the electromagnetic switch 12 and temperature relay 13, respectively. Further, the discharge valve driving motor 2 is similarly driven and controlled by the motor control center 20, and power is supplied to the motor 2 by connecting each of the wiring sheath disconnector 21, the electromagnetic switch 22, and the temperature relay 23 to the power line bus 3. It is done more. Further, the power for driving the relays related to the interlocking sequence of related controls is obtained from the power line bus 3 via the operating power transformer 4. As is well known, the wiring sheath breakers 11 and 21 have the function of a sectional switch and the short-circuit protection function of the motor circuit, and the electromagnetic switches 12 and 22 are for turning the motor on and off.
Temperature relays 13 and 23 are used for overcurrent protection of each motor.

In this way, control centers related to pumps, discharge valves, etc. that are driven in relation to each other are grouped together into a group (block), and a power control unit is configured for each such group.

In addition, as shown in Fig. 1, the operating power supply is provided with one operating power transformer 4 for multiple groups, and in addition to supplying it to a relay panel that controls the interlocking sequence, as shown in Fig. 2. An operating power transformer 4 is provided on the output side of the wiring cutter 11 of each control center 10, 20, and the reduced voltage drives the drive coil 120 of the electromagnetic switch 12 and the auxiliary equipment relay 5. In some cases,

[Problem that the invention seeks to solve]

As mentioned above, in a group of related devices that are closely related, such as the main pump drive motor 1 and the discharge valve drive motor 2, even if one motor is operable, the other motors must be operable. In this case, the drive cannot be controlled in practice.

Therefore, according to the prior art explained in FIG. 1 and FIG.
If 1 or 12 is not turned on, the corresponding motor will of course not be driven, but some of the related auxiliary relays 5 will not operate, so none of them will be able to be driven. In spite of this, providing a wiring cable and a disconnector for each motor not only complicates the configuration but also leads to the problem of erroneous operation.

In addition, even in the case of the operation power supply method, the first
According to the system shown in the figure, if the operating power transformer 4 fails, all of the plurality of power control units will stop, causing a problem in the reliability of the entire facility.

In addition, in either of the operating power supply systems shown in Figures 1 and 2, the excitation voltage of the drive coil of the electromagnetic switch is usually required to be 100 VAC or higher.
Lowering the voltage of sequence relay circuits having operating equipment for which a lower voltage is desirable has been prevented.

An object of the present invention is to provide a power control panel having a structure that simplifies the configuration of a power circuit, improves the reliability of an operating power source, and allows selection of voltage according to operating equipment.

[Means for Solving the Problems] In order to achieve the above object, the present invention groups a plurality of motors that are driven in association with each other, and provides one wiring cutter and disconnector for this group. , a control unit in which a plurality of electromagnetic switches which are branched from the wiring switch and disconnector and drive each of the motors on and off, and an interlocking sequence related to the group are incorporated; and an operating power transformer connected to the output side of the electromagnetic switch and supplying excitation power for the drive coil of the electromagnetic switch, and supplying operating power to the control unit by stepping down the secondary voltage of the operating power transformer. The automatic voltage regulator is housed in the same panel.

[Effect]

With this configuration, when one wiring cutter is turned on, multiple related motors can be started, and each motor can be opened and closed by remote control or by an interlocking sequence. Start and stop control is performed selectively by the device. That is, since one wiring cutter is provided for each group of motors that are driven in association with each other, the power circuit is simplified and erroneous operations such as forgetting to turn on the motor can be prevented.

Further, when the wiring sheath breaker is turned on, a secondary voltage is directly supplied from the operation power transformer to the drive coil of the electromagnetic switch of the motor group. on the other hand,
The reduced voltage is supplied to the control unit related to the interlocking sequence of the motor group via the automatic voltage regulator. That is, since one operational power transformer is provided separately for each group of motors that are related to each other, each group becomes independent, and the reliability of the equipment as a whole is improved. In addition, since the operating power supply is distributed for each group, but integrated into one for each group, it is easy to create multiple operating voltage levels without complicating the configuration, and it is possible to lower the voltage of the sequence circuit. It can be achieved.

〔Example〕

Hereinafter, the present invention will be explained based on examples.

FIG. 3 is a configuration diagram showing an embodiment of the present invention.
The power control panel 30 is arranged in a distributed manner for each group of related driven motors, and is composed of a power circuit unit 31, a transmission unit 32, a control unit 33, an analog calculation unit 34, and an operation monitoring unit 35. be done. These have a transmission function with a higher-level controller and an operation monitoring section for individual and linked operation of the corresponding block. The power circuit unit 31 controls each of the main pump drive motor 1 and the discharge valve drive motor 2 (rotation speed control and on/off). Note that the transmitter 6 is for transmitting on-site information. The transmission unit 32 also includes a transmission line 7.
is provided between the center and the center to transmit information and commands. A plurality of power control panels 30 having the same configuration (FIG. 3 shows a case of three power control panels) are provided. Further, the internal arrangement of the power control panel 30 is such that the power circuit unit 31 is disposed on the rear side of the panel, and the remaining components are provided on the front side. In particular, the operation monitoring unit 35 is attached to the front door. With this arrangement, it is possible to separate the high-voltage side on the rear side of the panel and the low-voltage circuit section on the front side of the panel.

FIG. 4 is a circuit diagram of one power control panel 30.

Power is supplied from the bus 3 to the power circuit unit 31 using only one wiring sheath breaker 11. The power path unit 31 connects the motor control centers 10 and 20 to the wiring sheath disconnector 1 in FIG.
Power circuit 311, 31 with a configuration in which 1 and 21 are removed
2 (the internal configuration is the same as that shown in FIG. 1, so the explanation will be omitted). On the other hand, the operating power is supplied from the output of the wiring disconnector 11 to the operating power transformer 4.
AC100V is obtained through. This voltage is directly used as a power source for the drive coil 120, and is also supplied to an automatic voltage regulator (AVR) 36 to obtain a low stabilized voltage, which is then supplied to each circuit and relay.

In this way, only one wiring switch and disconnector is provided for each motor group, one operating power transformer is provided for each group, only the drive coil is driven with AC100V, and other sequence control relays, etc. is assumed to be driven at low voltage via ACR.

Therefore, according to this embodiment, the configuration of the power circuit is simplified and the problem of erroneous operation such as forgetting to turn on the power does not occur.

In addition, the power supply for operation is distributed to each motor group, and one motor group is consolidated into one power source, making it easy to create multiple operating voltage levels.
For example, the reliability of the operating power source seen from the perspective of the entire sewage treatment facility is improved, and it becomes possible to select the voltage according to the operating equipment.

〔Effect of the invention〕

As explained above, according to the present invention, the related driven motors are grouped into one group, and one wiring cutter and one disconnector are provided for this group.
The configuration of the power circuit is simplified, and erroneous operations such as forgetting to turn on the power can be prevented.

In addition, while the operating power transformers are distributed for each motor group, one
By consolidating the power supply into a single operating power transformer and installing an automatic voltage regulator, it is easy to set up multiple operating voltage levels, making it possible to lower the voltage according to the voltage required by the operating equipment. There is.

The field of application of the present invention is not only water treatment equipment but also equipment that can be commonly connected to the cutter and cutter of rolling mills, etc., that is, all facilities where related driven equipment is installed on site. be.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a conventional power circuit, Figure 2 is a partial detailed diagram of the circuit in Figure 1, Figure 3 is a block diagram showing an embodiment of the present invention, and Figure 4 is a diagram of an embodiment of the present invention. It is a circuit diagram. DESCRIPTION OF SYMBOLS 1... Motor for driving a pump, 2... Motor for driving a discharge valve, 3... Power line bus, 4... Power transformer for operation, 7... Transmission signal line, 11... Wiring cutter, 12 , 22... Electromagnetic switch, 13, 23
...Temperature relay, 30...Power control panel, 31...
Power circuit unit, 32...Transmission unit, 33
...Control unit, 34...Analog calculation unit, 35...Operation monitoring unit, 36...
…Automatic voltage regulator.

Claims (1)

[Claims] 1. A plurality of motors that are driven in a related manner are set as one group, and one wiring sheath breaker is provided for this group, and a wiring sheath breaker is provided branching from this wiring sheath breaker. , a plurality of electromagnetic switches that drive each of the motors on and off, a control unit that incorporates an interlocking sequence related to the group, and a control unit that is connected to the output side of the wiring sheath breaker and that connects the electromagnetic switch An operating power transformer that supplies excitation power for the drive coil of the control unit, and an automatic voltage regulator that steps down the secondary voltage of the operating power transformer and supplies operating power to the control unit are housed in the same panel. A power control panel.