JPH0290204A - Control device incorporated with programmable controller - Google Patents

Abstract

PURPOSE:To prevent a load apparatus from executing malfunction due to an incorrect command applied from a programmable controller(PC) by comparing the ON/OFF state to a breaker with an ON/OFF switched contents from the PC in the case of switching a maintenance made to an automatic or manual mode, and when both the contents are different, inhibiting mode switching under the condition of the discrepancy. CONSTITUTION:The ON/OFF state of the common breaker 1 is controlled by manually applied ON/OFF commands 3a, 3b in the maintenance mode or ON/ OFF commands 4a, 4b applied from the PC 4 in the 2nd automatic mode. At the time of switching the maintenance mode to the automatic mode, the ON/ OFF state to the breaker 1 is compared with the command contents 4a, 4b from the PC 4, and when both the contents are different, the mode switching is inhibited under the condition of the discrepancy. Even when the set value of a repeater 8 is incorrectly set up during the execution of maintenance/ inspection work in the maintenance mode, the breaker 1 can be prevented from generating malfunction at the time of switching the maintenance mode to the automatic mode.

Description

[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) This invention provides a programmable controller (hereinafter referred to as a PC).
This invention relates to the improvement of a control device containing a built-in device.

, (Prior Art) FIG. 3 shows an example of a control device incorporating a PC.
FIG. 2 is a circuit diagram showing the configuration of a control device used in a conventional power circuit breaker.

This control device has a manual mode (first mode) and an automatic mode (second mode), and switching between these modes is performed by switching a rotary switch attached to a predetermined control panel. .

When this rotary switch is set to the manual position,
The manual contact 2a is turned on, and the automatic contact 2b is turned off.

Therefore, in the manual mode, the circuit breaker 1 is controlled to be in the on/off state by an on/off command manually given via the on switch 3a and the off switch 3b.

On the other hand, when the rotary switch is set to the automatic position, its manual contact 2a is turned off and its automatic contact 2b is turned on.

Therefore, in the automatic mode, the circuit breaker 1 is controlled to be turned on or off via the contacts 5a and 6a of the auxiliary relay 5.6 according to the turn command 4a and cut command 4b given from the PC 4. .

Maintenance and inspection work on this type of power receiving system is performed by setting the rotary switch to the manual position and connecting the manual contact 2.
This is carried out with contact a turned on and automatic contact 2b turned off.

During maintenance and inspection work, the setting values of various relays related to the breaking conditions of circuit breaker 1 may be adjusted, or the
It is often done to change the C4 soft sequence.

When the maintenance and inspection work is completed, the rotary switch is set to the automatic position, the manual contact 2a is turned off, and the automatic contact 2b is turned on, thereby returning to the normal operating state.

(Problem to be Solved by the Invention) However, in such a conventional PC built-in control device, it is possible to incorrectly adjust a relay or forget to set the software sequence of the PC4 during maintenance 1 inspection work. As a result, there was a problem in that the circuit breaker 1 was erroneously activated the moment the manual mode returned to the automatic mode.

That is, in the manual mode, if the on-off command switch 3a is turned on, the circuit breaker 1 is turned on, but at that time, the PC 4
If the disconnection command 4b is erroneously outputted and the contact 6a of the auxiliary relay 6 is turned on, the circuit breaker 1 will operate the moment the manual mode is switched to the automatic mode.

This invention has been made in view of the above-mentioned problems, and its purpose is to provide a control device with a built-in programmable controller of this type, when the normal operating state is restored after maintenance and inspection work, etc. The objective is to prevent load equipment from malfunctioning due to erroneous commands from a PC.

[Structure of the Invention] (Means for Solving the yI Problem) In order to achieve the above object, the present invention has the following advantages: In the control device having a built-in programmable controller that controls a common load device to be turned on or off in response to an on or off command given from a programmable controller, When switching to the second mode, the present invention is characterized by providing means for comparing the state of the load equipment and the contents of the command from the programmable controller, and prohibiting the mode switching on the condition that there is a mismatch between the two. be.

(Function) According to such a configuration, when switching from the first mode to the second mode, if a mismatch between the state of the load equipment and the contents of the command from the programmable controller is confirmed, the mode is switched from the first mode to the second mode. Since this is prohibited, it is possible to prevent malfunctions of the load equipment due to incorrect output from the programmable controller.

(Example) FIG. 1 is a circuit diagram showing the configuration of a circuit breaker control device to which the present invention is applied.

In this figure, the same components as those of the conventional example shown in FIG.

The main feature of this embodiment of the device is that in addition to the automatic and manual modes, a new maintenance mode is provided, and when switching from the maintenance mode to the automatic or manual mode, the on/off state of the circuit breaker 1 and the PC4 are The contents of the ON and OFF commands are compared, and if the two do not match, the mode switching is prohibited.

That is, the aforementioned rotary switch is automatic.

Manual and maintenance positions are provided.

The contact 2a is turned on in the manual and maintenance positions, the contact 2b is turned on in the automatic position, the contact 2c is turned on in the automatic and manual positions, and the contact 2d is turned on in the maintenance position.

The contact 2d is inserted in the energizing path of a time-limited return relay 8 that measures a minute time T, the a contact 8a of this time-limited return relay 8 is connected to the energizing path of the control discrepancy detection circuit 4C, and the b contact 8b is connected in series with the contact 2b. is inserted.

Therefore, this time-limited return relay 8 activates the control discrepancy detection circuit 4C only for a minute time T when returning from maintenance mode to automatic or manual mode, and activates control mismatch detection circuit 4C only for a minute time T when switching from maintenance mode to automatic mode. The energization of the contacts 5a and 6a is delayed only for a time T.

On the other hand, the control mismatch detection circuit 4C is configured by a PO2 soft sequence in this example, and its logic content is shown in FIG.

That is, this control mismatch detection circuit 4C
A predetermined detection output is generated only when the human condition and the cut-off command from PO2 overlap, or when the cut-off state of the circuit breaker 1 and the input command from PO2 overlap.

As is well known, the circuit breaker 1 is provided with an auxiliary contact for displaying operation, etc., and the ON state and OFF state of the circuit breaker 1 are detected through this auxiliary contact.

The auxiliary relay 7 receives the detection output of the control discrepancy detection circuit 4C, and drives the alarm circuit through its a contact 7C, and automatically turns on and off command contacts 5a through its b contact 7b.
5a is disabled.

In normal operating conditions, the rotary switch (not shown) is set to the automatic position, and in this case contact 2a
is off, 2b is on, 2C is on, and 2d is off.

Further, since the a contact 8a of the time-limited return relay 8 is turned off, the control mismatch detection circuit 4C does not operate. Further, the b contact 8b of the time-limited return relay 8 is in an on state.

Therefore, block I! The FI device 1 receives an input command 4a from the PO2.

In response to the off command 4b, the on state is entered via the contacts 5a, 5a,
Each is controlled to the off state.

In the manual mode, the rotary switch is set to the manual position, and its contacts 2a are on, contacts 2t are off, contacts 20 are on, and contacts 2d are off.

Therefore, the circuit breaker 1 is a manual switch 3a.

The on state and the off state are controlled by operating the manual off switch 3b.

In this case, the manual mode is used when it is desired to disconnect the circuit breaker 1 from the PO2 and perform an operation test on it alone, or when the PO2 has failed.

In the maintenance mode, the rotary switch is set to the maintenance position, and its contacts 2a are on, contacts 2b are off, contacts 2c are off, and contacts 2d are on.

Therefore, the circuit breaker 1 is controlled to be turned on or off by operating the manual switch 3a and the manual off switch 3b.

Further, in this maintenance mode, the time-limited return relay 8 is operated, so that its a contact 8a is in an on state.

Next, the operation when switching from maintenance mode to automatic mode or manual mode, which is the main part of the present invention, will be explained.

When switching from the maintenance mode to the automatic mode, the contact 2a switches from on to off, the contact 2b switches from off to on, the contact 2C switches from off to on, and the contact 2d switches from on to off.

Then, due to the action of the time-limited return relay 8, the a contact 8a is kept in the ON state only for a short period T immediately after switching, and during that time, the control mismatch detection circuit 4C operates, and if a control mismatch occurs, The auxiliary relay 7 is energized, and the auxiliary relay 7 is self-maintained via its a contact 7a.

Then, the a contact 7c of the auxiliary relay 7 is turned on, the alarm circuit is driven, and the occurrence of the control mismatch state is notified by a buzzer or the like.

Furthermore, the B contact 8b of the time-limited return relay 8 returns from on to off with a slight delay from the time of switching from the maintenance mode to the automatic mode, while the B contact 7b of the auxiliary relay 7 turns on almost at the same time as the switching time. It switches from to off.

Therefore, from now on, the operations of contacts 5a and 6a that mediate the ON command and OFF command from the PC 4 are disabled by turning off the B contact 7b of the auxiliary relay 7, and even if a control mismatch occurs, maintenance The circuit breaker 1 will not malfunction when switching from mode to automatic mode.

The above is the case when switching from maintenance mode to automatic mode, but in this embodiment, even when switching from maintenance mode to manual mode and further switching from manual mode to automatic mode, the circuit breaker 1 malfunctions. We are making efforts to prevent this from happening.

In other words, even when switching from maintenance mode to manual mode, contact 2C switches from off to on, so the control discrepancy detection circuit 4C operates from then on in the same way as when switching from maintenance mode to automatic mode. However, if control mismatch has occurred, the b contact 7b of the auxiliary relay 7 is turned off, thereby disabling the operations of the contacts 5a, 5a.

Therefore, even if the manual mode is switched to the automatic mode in this state, the circuit breaker 1 will not malfunction because the contact 7b is turned off.

In this way, in the device of this embodiment, the first mode (
maintenance mode), manually given on/off commands (
3a, 3b), and in the second mode (automatic mode), the on/off command (4a) given from the programmable controller 4.

4b), in a control device incorporating a programmable controller that controls a common circuit breaker 1 to be turned on and off, from the first mode (maintenance mode) to the second mode (automatic mode). When switching, the on/off state of the circuit breaker 1 is compared with the command content (4a, 4b) from the programmable controller 4, and if there is a mismatch between the two, the mode is switched (from maintenance mode to automatic mode). This prevents circuit breaker 1 from malfunctioning when switching from maintenance mode to automatic mode, even if the setting value of the relay is incorrectly set during maintenance inspection work in maintenance mode. effective.

In the above embodiments, a control device with a built-in programmable controller and a control device for a power disconnector are mentioned, but the present invention is not limited to these and can be applied to various other control devices.

[Effects of the Invention] As is clear from the above description, according to the present invention, when a control device incorporating this type of programmable controller returns to a normal operating state after maintenance/inspection work, etc. It is possible to reliably prevent load equipment from malfunctioning due to erroneous commands from the PC.

[Brief explanation of the drawing]

FIG. 1 is a sequence circuit diagram showing one embodiment of the device of the present invention, FIG. 2 is a logic symbol diagram showing details of a control mismatch detection circuit, and FIG. 3 is a sequence circuit diagram showing the configuration of a conventional device. 1... Breakers 2a, 2b, 2c, 2d... Rotary switch contacts 3a... Manual switch 3b... Manual cut-off switch 4... Programmable controller 4a... Programmable controller on/off Directive 4
b...Cut command 4C from programmable controller
... Control mismatch detection circuit 5.6.7 ... Auxiliary relay 8 ... Time-limited return relay

Claims (1)

[Claims] In the first mode, the common load equipment is controlled by manually given on/off commands, and in the second mode, by the on/off commands given from the programmable controller. In a control device incorporating a programmable controller configured to control the on state and off state, when switching from the first mode to the second mode, the state of the load equipment and the content of the command from the programmable controller A control device having a built-in programmable controller, characterized in that the control device includes a means for comparing the modes and prohibiting the mode switching on condition that there is a discrepancy between the two.