JPS6052799A - Controller for sand pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sump pump home control device to which a multiplex transmission device is applied, for example in a nuclear power plant.

[Technical background and problems of the invention]

The sump pump control device controls the sump pump for transferring waste liquid stored in the sump tank to other equipment, and in automatic mode, when the liquid level in the sump tank reaches 1 high, it outputs a sump pump drive signal. output,
In manual mode, the control function always outputs a sump pump drive signal.

In a sap pump control device using a multiplex transmission device, conventionally, as shown in Fig. 1, the sump liquid height 1 signal 3 of the level switch 2 attached to the sump tank 1 is not transmitted to the sump pump 4 or the level switch 2. The signal is input to a multiplex transmission device 6 housed in a remote station 5 installed nearby. This signal is transmitted via a bidirectional multiplex transmission line 7 to a multiplex transmission device 6 housed in a master station 9 installed in a central operation room 8, and is output as a sump liquid level 1 high' output signal 10. In the central control room 8, the output signal 10 of the sander liquid level 1 high 1, the operation switch 1 automatic l signal 11, and the operation switch ``friend'' signal 12 are used to control the operation switch 1 automatic'' signal 11 and the operation switch 1 automatic signal 11. Signal obtained by logical product of liquid level 1 high 1 output signal 1O and operation switch 1
A drive interlock for the sump pump 4 is established, which is the logical sum of the human signal 12, and the sump pump drive signal 13 with this interlock is input to the multiplex transmission device 6 housed in the master station 9. The input sump pump drive signal 13 is output as a sump pump drive output signal 14 to a multiplex transmission device 6 housed in the remote station 5 through a bidirectional multiplex transmission line 7, thereby driving the sump pump 4.

In the sump control device using the multiplex transmission device sound having such a configuration, if the multiplex transmission device 6 housed in the master station 9 or the remote station 5 breaks down,
Alternatively, if the bidirectional multiplex transmission line 7 is disconnected, correct signals will no longer be transmitted, making it impossible to control the sump pump correctly. In this state, the sump pump 4 will not start, and if left unattended, the liquid level in the sump tank 1 will rise, and in order to prevent overflow, it is necessary to restrict the flow of waste liquid into the sump tank 1 in a short period of time. However, the disadvantage was that the operation of the plant itself had to be restricted.

[Purpose of the invention]

An object of the present invention is to drive the sump pump when the sump pump becomes 1 high I, and to enable waste liquid transfer from the sump tank, even if the multiplex transmission device fails or the bidirectional multiple transmission line is disconnected. It turns out.

[Summary of the invention]

The present invention enables a multiplex transmission device housed in a remote station on the load side to receive a sump pump drive signal or a sump pump drive interlock transmitted through a multiplex transmission line from a multiplex transmission device housed in a master station on the operating side. In the sump pump control device that drives all the sump pumps, the multiplex transmission device itself has an internal signal that makes up all the signals. Alternatively, the present invention is characterized in that a circuit for stopping the load is provided in the signal line for driving the sump pump of the remote station on the load side.

[Embodiments of the invention]

An embodiment of the sump pump control device to which the multiplex transmission device of the present invention is applied will be described below with reference to FIG.

The operation switch 1 of the sump pump 4 installed in the central control room 8 is automatic! A sump pump drive signal 13t which is a logical sum of the signal 11, the sump liquid level 1 high output signal 10 output from the multiplex transmission device 6, and the operation switch 1 signal 12 is sent to the manually operated master station 9. A multiplex transmission device 6 housed in the remote station 5 receives the sander liquid level 1' signal and outputs the sump pump drive output signal 13i. and a failure of the multiplex transmission bag f16 housed in the master station 9 or remote station 5, and the multiplex transmission device 60 housed in both the master station 9 and the remote station.
A failure detector 15, which is also housed in the remote station 5, detects disconnection of the bidirectional multiplex transmission line 7 between which data is transmitted. In addition, an AND signal of the failure output signal 16 of the failure detector 15 that is output when a failure or disconnection is detected, another sump liquid level 1 high signal 3a, and an AND signal of the sump pump drive output signal 14 is used to generate a signal in the sump tank 1. It consists of an output signal that drives the sump pump 4 to be added.

Now, in the central control room 8, the sump liquid level 1 high' output signal 10. When the drive interlock of the sump pump 4 is established based on the operation switch "auto" signal 11 and the operation switch "one person" signal 12, the sump pump drive number 13 is outputted and inputted to the multiplex transmission device 6 housed in the master station 9. Ru. This input original signal is the bidirectional multiplex transmission line 7
is output as a sump pump drive output signal 14 to a multiplex transmission device 6 housed in a remote station 5.
Drive the sump pump 4. Here, if a failure occurs in the multiplex transmission device 6 housed in the master station 9 or the remote station 51'14X, or if a disconnection occurs in the multiplex transmission line 7, and data is not transmitted correctly, the data will not be transmitted correctly to the remote station 5. Fault detector 15 to be stored
detects this and outputs a fault output signal 16. When the sump liquid level rises in this state, the other sander liquid level high' signal 3a of the level switch 2 turns on, and the sump liquid level increases by a signal obtained by taking the logical product of the fault output signal 16 and the sump liquid level 1 high 1 signal 3a. An output signal is generated which drives the pump 4 and the sump pump 4 is activated.

Next, another embodiment of the sump pump control device to which the multiplex transmission device of the present invention is applied will be described with reference to FIG. Components that are the same as those in the embodiment described in FIG. 2 are given the same reference numerals and will not be fully described. The operation switch "automatic" signal 11 and the operation switch "single person" signal 12 installed in the central control room 8 are input to the multiplex transmission device 6 housed in the master station 9, and are transmitted through the entire bidirectional multiplex transmission line 7 to the remote station. A multiplex transmission device 6 housed in 5 outputs the operating switch 1 automatic' output signal 17 and the operating switch 1' output signal 18, respectively. The logical sum of the operation switch 1 automatic' output signal 17, the failure detection signal 16 of the failure detector 15 housed in the remote station 5, the OR signal, and the sump liquid level 1 height 1 signal 3 is calculated. By ORing this ANDed signal and the output signal 18 of one operation switch, the sump pump drive signal 13 is all created and the sump pump 4 is driven. When the multiplex transmission device 6 housed in the station 9 or the remote station 5 fails, or when the bidirectional multiplex transmission line 7 is disconnected and data is not transmitted correctly, the failure detector 15
A failure detection signal 16 is output.

In this state, when the sander liquid level 6 high' signal 3a turns on,
A pump drive signal 8 is output, and the pump is driven.

〔Effect of the invention〕

As explained above, the failure detector gold film detects failure of the multiplex transmission device itself or disconnection of the transmission line, and when this failure is detected, the failure detection signal and the sander level 1 high 1 signal are output from the failure detector. Since the sump pump can be driven by the AND signal of Since the sump pump is driven, an abnormal rise in the level of waste liquid in the sump tank is prevented.

Furthermore, although the above explanation has focused on a sump pump control device, failures of multiplex transmission devices or multiplex transmission lines can also occur in control devices that use multiplex transmission devices that generally drive and control processes. When this occurs, the process can be controlled so that the system in which the process exists is systemically fail-safe by forcibly driving or stopping the process.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional sump pump control device applied to a multiplex transmission device, Fig. 2 is a configuration diagram showing an embodiment of the present invention applied to a multiplex transmission device, and Fig. 3 is a configuration diagram showing an embodiment of the present invention applied to a multiplex transmission device. 1 is a configuration diagram showing an entire embodiment of the present invention; FIG. ■...Sump tank 2...Level switch 3.3
&...Sump liquid level 1 high' signal 4...Sump pump 5...Remote station 6...Multiple transmission device 7...Bidirectional multiple transmission line 8...Central operation 34 9... Master station 10... Sump liquid level 1 high' output signal 11... Operation switch 1 automatic' signal 12... Operating switch 1 person' signal 13... Sump pump drive signal 14... Sangu bong drive output signal

Claims (1)

[Claims] A multiplex transmission device housed in a remote station on the load side configures a sump pump drive signal or an in-no-lock for driving the sump pump, which is transmitted through a multiplex transmission path from a multiplex transmission device housed in a master station on the operating side. In the sump pump control device that drives the sump pump, it is possible to forcibly drive or stop the sump pump as a fail-safe in the event of a failure of the multiplex transmission device itself or the multiplex transmission line. A sap pump control device characterized in that a circuit is provided in a signal line for driving a sump pump of the remote station on the load side.