JPS59123116A - Control circuit of switch - 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 control circuit for a switch which is divided into a controlled power supply bus and a power operated power supply bus and which is controlled to be turned on or off by an electric operation circuit.

[Technical background of the invention]

An example of a control circuit for a conventional switch of this kind is shown in FIG. 1, which is composed of a closing control circuit, a cutoff control circuit, and an electric operation circuit ζ. In the closing control circuit, a series circuit consisting of a closing control switch 1, a closing control auxiliary relay The normally open contact Xal of the auxiliary relay X for closing control is connected.

In the cutoff control circuit, the cutoff control switch 3, the auxiliary relay Y for cutoff control, the normally open contact 4 of the switch, and a series circuit are connected between the control power supply buses P and N.
A normally open contact YaI of the auxiliary relay Y for cutoff control is connected in parallel to the .

On the other hand, the electric operation circuit is configured as follows. A power operation power supply bus PM obtained by branching from the control power supply buses P and N via the sectional switch 5.

A series circuit of the normally open contact Xat of the auxiliary relay for closing control, the DC motor M, and the normally open contact Xa of the auxiliary relay for closing control is connected between NM. Further, a normally open contact Ya of an auxiliary relay for cutoff control is connected in parallel to the DC motor M and the normally open contact Xa. Furthermore, a normally open contact Xa and a normally open contact Ya of an auxiliary relay for cutoff control are connected in parallel to the DC motor M.

[Problems with background technology]

In a device configured in this way, if the closing control switch 1 is operated to close the sectional switch 5 in an open state in order to lock the operation of the corresponding switch, etc., if the switch is in an open state, .

Relay X is energized via normally closed contact 2, which closes normally open contact X□ to form a self-holding circuit, and at the same time, normally open contact Xa1. Xas is also closed, but since no power is applied to the power control power supply buses PM and NM, the DC motor M does not operate and the switch is not turned on.

When the section switch 5 is closed in this state, the normally open contacts Xa, , X3g are already closed, so the DC motor M is driven and the switch is closed.

The above also applies when a cutoff operation is performed on a switch that is in a closed state. That is, when the 1-section switch 5 is open and the cutoff control switch 3 is closed, the relay Y is energized and the normally open contacts Ya, 1, y, are also closed, but the power control power supply buses PM and NM are closed. Since no power is applied, the DC motor M does not operate and the switch is not cut off. When the section switch 5 is closed in this state, the normally open contact ya2. Since Ya is already closed, the DC motor M is driven and the switch is cut off.

In this way, in the conventional switch control circuit, even if the closing or cutting-off control switch 1 or 3 is operated with the section switch 5 in the open state due to an operation lock or the like, the DC motor M is not driven, and the switch is not turned on or cut off, but if the section switch 5 is turned on again in this state, the DC motor M is driven and the switch is turned on or cut off.

[Purpose of the invention]

The present invention was made in view of these circumstances.
It is an object of the present invention to provide a control circuit for a switch that can prevent malfunctions of the switch, has a simple circuit configuration, has good coordination, and is highly reliable.

[Summary of the invention]

In order to achieve the above object, the present invention connects a switch closing/cutting control circuit between the control power supply buses connected to the control power supply, and includes a self-holding circuit for self-maintaining the operation of this control circuit. It is connected between the power operation power supply bus connected to the control power supply and the control power supply.

[Embodiments of the invention]

The present invention will be explained below with reference to FIG.
What is different from the diagram is the normally open contact Xa1 of the auxiliary relay for closing control
, the normally open contact Ya of the auxiliary relay Y for cutoff control are connected as follows.

That is, one end of the normally open contact Xa is connected to the power control power supply bus P.
M, and the other end is connected to control switch 1 and relay 6x
Connect to the connection point with. Further, one end of the normally open contact Ya1 is connected to the power operation power supply bus line PM, and the other end is connected to the connection point between the cutoff control switch 3 and the relay Y. In addition, the power operation power supply bus PM is connected to the sectional switch 5 from the control power supply bus P.
It was obtained by branching through . The configuration outside the point plate described above is the same as that in FIG. 1.

The explanation thereof will be omitted here.

The operation of the control circuit for the switch configured as described above will be explained below, but first, the case of the closing operation of the switch will be explained. By closing the closing control switch 1, the auxiliary relay for closing control X is excited via the normally closed contact 2 of the switch, the normally open contact Xa1 of the relay At the same time, normally open contacts X□, Xa of the relay are formed.

is closed, the DC motor M is driven, and the switch is closed. When the switch is turned on, the normally closed contact 2 of the switch opens.
The self-holding circuit of relay X is opened, and the closing operation of the switch is completed.

Next, a case will be described in which a switch in a closed state is operated to cut off. That is, by operating the cutoff control switch 3 to close, the cutoff control auxiliary relay Y is excited via the normally open contact 4 of the switch, the normally open contact YaI of the relay Y is closed, and the power operation power supply bus PMI is turned off. At the same time as the self-holding circuit is formed, the normally open contact Ya! of relay Y!
, Ya, are closed, the DC motor M is excited with a polarity opposite to that of the closing operation of the switch and is driven in the opposite direction, and the switch is cut off. When the switch is cut off, the normally open contact 4 of the switch is opened, the self-holding circuit of the relay 6Y is opened, and the cutoff operation of the switch is completed.

In this way, when the section switch 5 is in the open state due to the operation lock etc.
Even if the switch is closed or cut off, the closing control auxiliary relay You won't be hit.

〔Effect of the invention〕

As described above, the present invention is configured so that the power for the self-holding circuit of the auxiliary relay for controlling the closing or disconnecting of the switch is taken from the power operation power supply bus, so malfunction of the switch can be prevented and the circuit configuration is simple. We can provide highly coordinated and reliable switch control circuits.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram showing an example of a conventional switch control circuit.
FIG. 2 is a wiring diagram showing an embodiment of the switch control circuit of the present invention. P, N, , Control power supply bus, PM, NM... Power operation power supply bus, 1... Closing control switch, 2... Normally closed contact of switch, 3... Cutting off control switch, 4.・・Normally open contact of the switch, X ・・Auxiliary relay for closing control, Y・
...Auxiliary relay for cutoff control, XaI, Xa□Xa,,
,, Normally open contact of auxiliary relay for closing control, Yal, Y□. Yal...Normally open contact of auxiliary relay for cutoff control, M...
・Electric motor for operating the switch.

Claims (1)

[Claims] A power operation power supply bus is connected to the same control power supply via a control power supply bus and a sectional switch, and a closing control circuit or a cutoff control circuit of the switch is connected between the control power supply and the ffl line,
A self-holding circuit for self-maintaining the operation of the control circuit is connected between the control power supply bus and the power operation power supply bus, and when the self-holding circuit is formed between the power operation power supply bus, the switch A control circuit for a switch connected to an electric operating circuit such as an electric motor for turning on or off.