JP2000259261A - Safety device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a safety device by which input of high voltag power source is normally prevented at the state that a door is opened and the high voltage power source can be input even at the state that the door is opened by easy operation in the case of a test, etc. SOLUTION: In the safety device for high voltage power source to be used for a device with an opening/closing door and for which the high voltage power source is used as an input power source, a door monitoring circuit 2 to monitor opening/closing of the door and to restrict the input of high voltage power source to only in the case that the door is closed by actuating a control circuit 1, a self holding starting circuit 4 to enable the input of high voltage power source even when the door is opened by releasing restriction of the door monitoring circuit 2, a self holding circuit 3 to hold a state that the restriction of the door monitoring circuit 2 is released by the self holding starting circuit 4 and a restoring means to restore the state held by the self holding circuit 3 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a safety device,
In particular, it relates to a safety device for a high-voltage power supply.

[0002]

2. Description of the Related Art A device which is constructed in a large rack or the like and has a high input power supply. Conventionally, a power supply unit is usually constructed as shown in FIG. 3, and as a result, when an input power switch is turned on. Power was supplied. In FIG. 3, 1
Is a control circuit, 5 is a power switch, 6 is a high voltage input power supply,
7, an input signal for driving the control circuit; and 8, a power supply line.
However, in such a configuration, even when the rack panel door is open, if the power switch is ON, high voltage is applied to the inside of the device. If the safety was not confirmed visually, there was a danger of touching the inside of the device without knowing that high voltage was applied.

[0003] Of course, it is possible to adopt a circuit configuration in which the power is turned off when the door of the rack panel of the apparatus is open. However, in this case, the door of the rack panel of the apparatus is opened. In this state, it is not possible to check the operation of the equipment, perform tests or repairs, etc.The door must be closed each time the power is turned on for tests, etc., which is unnecessary for simple tests and checks. It will take time.

[0004]

As described above, conventional safety measures for a high-voltage power supply rely only on the operation of a power switch or simply prevent the high-voltage power supply from being input when the door is open. Simple and
There were problems such as not being sufficiently safe, and being unable to perform tests and the like with the door open. The present invention solves this problem so that high-voltage power is not normally input when the door is open, and high-voltage power can be input even when the door is open by a simple operation during a test or the like. It is an object of the present invention to realize an inexpensive safety device.

[0005]

In order to achieve the above object, the present invention provides a safety device for a high voltage power supply used in a device having an openable / closable door and using a high voltage power supply as an input power supply. A door opening / closing monitoring means for monitoring and limiting the input of the high voltage power supply only when the door is closed; and an input of the high voltage power supply even when the door is opened by releasing the restriction of the door opening / closing monitoring means. Limit release switch means, self-holding means for holding the state where the restriction release switch means has released the restriction of the door open / close monitoring means, and recovery means for restoring the state held by the self-holding means. It is characterized by having.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a safety device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating the principle of operation of the present invention. FIG.
Among them, 1 is a control circuit for receiving an input signal for driving and supplying input power to a power supply line inside the apparatus while the signal is maintained, and 2 is for monitoring the opening and closing of a door panel, and if the door panel is in a closed state. For example, a door monitoring circuit for transmitting a drive input signal to the control circuit 1, a self-holding circuit 3, a self-holding start circuit 4 for starting the self-holding circuit 3, a high-voltage input power supply 6, and a driving input signal 7 , 8 are power supply lines.

The self-holding circuit 3 stops the transmission of the drive input signal to the control circuit 1 when the door monitoring circuit 2 detects the open state of the door panel when the door panel is opened for a test of the apparatus or the like. Even in the case where the self-holding start-up circuit 4 starts up, the function of independently transmitting the drive input signal to the control circuit 1 is maintained, and the test of the device is completed and the reset signal is input. Alternatively, when the door panel is closed, the transmission function of the driving input signal is released, and the transmission of the driving input signal is entrusted to the door monitoring circuit 2.

With this configuration, during normal operation, the function of the door monitoring circuit 2 supplies high-voltage power only when the door panel is closed, and stops supplying high-voltage power when the door panel is opened. On the other hand, if you want to operate the device with the door panel open for testing, etc.,
If the self-holding activation circuit 4 is operated to hold the self-holding circuit 3, high-voltage power is supplied to the apparatus even when the door panel is open.

FIG. 2 shows a specific circuit diagram of an embodiment of the safety device of the present invention. In FIG. 2, 1 is a control circuit, 2 is a door monitoring circuit, 3 is a self-holding circuit, 4 is a self-holding activation circuit,
5 is a power switch, 6 is a high voltage input power supply, 7 is an input signal for driving a control circuit, and 8 is a power supply line. This circuit is constituted by a relay circuit.

When the apparatus is operated by supplying power, the door is closed and the power switch 5 is turned on. By closing the door, the momentary switch of the door monitoring circuit 2 is connected to the side a. As a result, the control circuit drive input signal 7 is input, a current flows through the relay coil of the control circuit 1, the relay contact is connected to the a side, the high voltage input power supply 6 is connected to the power supply line 8, and the power supply is connected to the device. Is supplied.
In this state, when the door is opened, the switch of the door monitoring circuit 2 is connected to the b side, the relay of the control circuit 1 is inactive, and the relay contact is at the b side. As a result, the connection between the high-voltage input power supply 6 and the power supply line 8 is disconnected, and the power supply to the device is stopped. That is, power supply to the apparatus is cut off by opening the door, and there is no danger of electric shock.

Next, when it is desired to supply power while the door panel is open for work such as a device test, the momentary switch of the self-holding start circuit 4 is pressed. As a result, the relay of the self-holding circuit 3 operates, and both of the two-pole relay contacts are connected to the a side. In this state, the input signal 7 for driving the control circuit flows through the relay coil through the a-contact of the first pole of the relay.
The self-holding circuit 3 continues to function even when the momentary switch is released. When the power switch 5 is turned on, the control circuit driving input signal 7 flows to the relay coil of the control circuit 1 through the contact a of the second pole of the relay and the power switch 5, and the relay contact of the control circuit 1 moves to the a side. The high-voltage input power supply 6 is connected to the power supply line 8 to supply power to the apparatus.

When the device test is completed, the door of the door monitoring circuit 2 is connected to the a side when the door panel is closed. As a result, the relay of the self-holding circuit 3 is deactivated, and the self-holding function ends and returns to the initial state.

The embodiment shown in the circuit diagram of FIG. 2 can be easily and inexpensively constructed using commercially available relays, microswitches, and momentary switches. Further, such a configuration can be easily realized by using a sequence control device, a microcomputer, or the like.

As described above, according to the present invention, in a device housed in a rack or the like using a high-voltage power supply as an input power supply, normally, the opening and closing of the door panel is monitored, and no power is input when the door panel is open. In this way, safety is ensured, and in special cases such as equipment tests, this is released and the power is turned on even if the door panel is open,
Safety measures and convenience during device testing can be obtained at the same time. Further, when the device test or the like is completed, the door is reset to the initial state simply by closing the door panel, so that the operation can be executed without being conscious of the release operation, and the operation is easy and safe. Further, the configuration is relatively simple and can be realized at low cost.

[0016]

As described above, according to the first aspect of the present invention, there is provided a safety device for a high-voltage power supply used in an apparatus having a door that can be opened and closed and using a high-voltage power supply as an input power supply. Door opening / closing monitoring means for monitoring and limiting the input of the high voltage power supply only when the door is closed, and releasing the restriction of the door opening / closing monitoring means to enable input of the high voltage power supply even when the door is open Limit release switch means, self-holding means for holding the state where the restriction release switch means has released the restriction of the door open / close monitoring means, and recovery means for restoring the state held by the self-holding means. And With this, in a device housed in a rack or the like that uses a high-voltage power supply as an input power supply, the door panel is normally monitored for opening and closing, and when the door panel of the device is open, power cannot be input to ensure safety, In special cases such as equipment testing, this power input restriction is released so that the power can be turned on even when the door panel is open, and the state in which the power input restriction has been released can be easily restored. Therefore, safety measures and convenience at the time of device testing can be obtained at the same time.

According to the invention of claim 2 of the present invention, the restoring means restores the state held by the self-holding means when the door is closed. Thus, the safety device can be restarted without being aware of the operation of closing the door after the test or the like is completed, so that the operation is easy and safe.

[Brief description of the drawings]

FIG. 1 is a diagram showing the operation principle of the present invention.

FIG. 2 is a specific circuit diagram of one embodiment of the safety device of the present invention.

FIG. 3 is a circuit diagram showing a configuration of a conventional power supply portion.

[Explanation of symbols]

1. Control circuit, 2. Door monitoring circuit, 3. Self-holding circuit,
4 Self-holding start circuit, 5 Power switch, 6 High-voltage input power supply, 7 Input signal for control circuit drive, 8 Power line

Claims (2)

[Claims] 1. A safety device for a high-voltage power supply used in a device having a door that can be opened and closed and using a high-voltage power supply as an input power supply, wherein the opening and closing of the door is monitored and the input of the high-voltage power supply is closed. Door open / close monitoring means for limiting only to the case, limit release switch means for releasing the restriction of the door open / close monitor means and enabling input of the high voltage power supply even when the door is open, and limit release switch means A self-holding unit for holding a state in which the restriction of the door opening / closing monitoring unit is released, and a restoring unit for restoring the state held by the self-holding unit. 2. The safety device according to claim 1, wherein the restoring unit restores the state held by the self-holding unit when the door is closed.