JPH03184738A - Setting method for electric control board of machine tool and electric control board thereof - Google Patents

Abstract

PURPOSE:To enable an accident prevention by detecting the polarity of a sequencer with the connection of the sequencer and the electric control board of a machine tool, changing over the polarity of the interface circuit of the electric control board from the detection result and responding promptly and freely to the sequencer of an unlike pole. CONSTITUTION:When a polarity detection circuit 11 is connected to the input terminal 23a of a sequencer 2 and a sequencer 2 is connected to the electric control board 1 of a machine tool, in the case of the input circuit of the sequencer 2 being voltage +V common input circuit 21a, current flows into the polarity detection circuit 11 from the power source +V of voltage +V common input circuit 21a. The polarity detection circuit 11 then judges that the polarity of the sequencer 2 is voltage +V common by this flowing-in of current, transmitting it as a discrimination signal to a polarity changing over circuit 12 and the polarity changing circuit 12 changes over the voltage of a common wire to a grand side by this discrimination signal. The sequencer 2 and an interface circuit 13 become in a conformed state by the action like this and the transmission and receiving of mutual information signals become possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for setting a power control panel of a machine tool controlled by a sequencer and a built-in sequencer of an NC device, and a power control panel therefor.

[Conventional technology]

In order to control a machine tool with a sequencer, it is necessary to design control software and determine the machine's operation.
It is necessary to design a hardware interface for the connection and prepare it on the machine tool's power panel. The interface of this machine tool's power panel is equipped with a circuit whose common wire polarity is fixed to match the input/output polarity of the sequencer, and is compatible with each sequencer.

FIG. 3 is a circuit diagram showing an example of an interface of a conventional power panel of a machine tool. Figure 3(a) shows the input circuit and output circuit when the polarity of the 7-sequencer is current outflow, and Figure 3(b) shows the input circuit and output circuit when the polarity of the sequencer is current inflow. The circuit and output circuit are shown. Third
In figure (a), when the contact 61 on the power panel of the machine tool closes, current flows from the power supply +■ on the sequencer side to the common wire of the power panel of the machine tool, the photocoupler 32 lights up, and the sequencer inputs a signal. You can check the status. Further, when the transistor 66 of the sequencer is turned on, a current flows from the sequencer to the common line, the relay 64 is operated, and the actuator of the machine tool is driven.

In Figure 3 (b), the current is the power supply of the machine tool's power board +■
The only difference from FIG. 3(a) is that current flows from the terminal to the common line of the sequencer, but the functions are the same.

[Problem to be solved by the invention]

For the interface of the above-mentioned machine tool's power panel, it is necessary to prepare a circuit to match the polarity of the sequencer.

Therefore, there is a problem that connection is not possible unless a powerful electrical board with an interface circuit is prepared for each type of sequencer. This results in the hassle of having to prepare and change the set of powerful electrical panels for different sequencers in the same machine tool, and also leads to accidents such as damage to the equipment due to connecting interfaces with different polarities.

[Means to solve the problem]

The present invention solves the above-mentioned problems by providing a power-operated power panel of a machine tool with a polarity detection circuit that detects the polarity of a sequencer and a polarity switching circuit that switches the polarity of an interface circuit based on the result of this determination.

[Effect]

The present invention detects the polarity of the sequencer by connecting the sequencer and the power board of the machine tool, and switches the polarity of the interface circuit of the power board based on the determination result, making it possible to quickly and freely respond to sequencers with different polarities. It is something.

〔Example〕

FIG. 1 is a block diagram showing an example of a power panel of a machine tool according to the present invention. The power control panel 1 of the machine tool includes an interface circuit 1 for transmitting and receiving signals to and from the sequencer 2, and a polarity detection circuit for determining the polarity of the sequencer 2 based on the current flowing in and out of the sequencer 20 input terminal 23a or output terminal 23b. It is constituted by a circuit 11 and a polarity switching circuit 12 that switches the polarity of the common line of the interface circuit 13 based on the determination result from the polarity detection circuit 11.

In such a configuration, the input terminal 23 of the sequencer 2
3 is connected to the polarity detection circuit 11, and when the input circuit of the sequencer 2 is the voltage + V common input circuit 21a, when the sequencer 2 is connected to the power panel 1 of the machine tool, the current changes to the voltage + V common input circuit. Flows into the polarity detection circuit 11 from the power supply +■ of 21a. The polarity detection circuit 11 determines that the polarity of the sequencer 2 is voltage + common due to the inflow of this current, and sends it to the polarity switching circuit 12 as a determination signal. The polarity switching circuit 12 switches the voltage of the common line to the ground side based on this discrimination signal. Through such an operation, the sequencer 2 and the interface circuit 16 are brought into a compatible state, and it becomes possible to send and receive information signals between them. The input circuit of sequencer 2 is ground common input circuit 2.
In the case of 1b, when the sequencer 2 is connected to the heavy-duty electrical panel 1 of the machine tool, current flows out from the polarity detection circuit 11 to the ground of the ground common input circuit 21b. The polarity detection circuit 11 determines that the polarity of the sequencer 2 is ground common due to the outflow of this current, and the polarity switching circuit 1
2 as a discrimination signal. The polarity switching circuit 12 switches the voltage of the common line to the +V side based on this discrimination signal.

Through such an operation, the sequencer 2 and the interface circuit 16 are brought into a state of compatibility, and it becomes possible to send and receive information signals to and from each other.

The polarity detection circuit 1 is connected to the output terminal 23b of the sequencer 2.
If you connect 1, the output circuit will be voltage +■Common output circuit 2
2a or the ground common output circuit 22b, the same operation as described above can be performed. However, in this embodiment, it is necessary to keep the output circuit of the polarity detection circuit 11 active at all times by the control software of the sequencer 2.

Furthermore, in this embodiment, the sequencer 2 is described assuming a combination of a voltage +■ common input circuit 2ia and a voltage +V common output circuit 22a, or a combination of a ground common input circuit 21b and a ground common output circuit 22a. However, the common switching by the polarity switching circuit 12 also applies to the combination of the voltage +V common input circuit 21a and the ground common output circuit 221) or the combination of the ground common input circuit 21b and the voltage +■ common output circuit 22a. It is possible to deal with it.

FIG. 2 is a circuit example of the polarity detection circuit 11 and the polarity switching circuit 12 of the heavy-duty power panel 1 of a machine tool according to the present invention.

The polarity detection circuit 11 includes a resistor 1' (a, Rb, and a resistor 'l) for converting an inflow/outflow current from a detection terminal T into a voltage.
'(Constructed of comparators 111a and 111b that compare the voltage converted by aSRb with a reference voltage to determine the voltage. The polarity switching circuit 12 is configured by the polarity detection circuit
Photocouplers 121a, 12 driven by the output of
1b, and transistors 122a and 1 that are driven by photocouplers 121a and 121b to switch the common line.
22b.

In such a configuration, when the ground common input circuit 21b is connected to the detection terminal T, a current i flows in the direction shown. When this current i passes through the resistor Ra, the voltage at the detection point S becomes lower than the reference voltage ka of the comparator 111a.
x This turns the output of the comparator 111a ON.
Therefore, the photocoupler 121a is turned on. When the photocoupler 121af is turned on, the transistor 122a becomes conductive, and the voltage of the common Com becomes +V. Further, when the voltage +■ common input circuit 21a is connected to the detection terminal T, the voltage at the detection point S becomes higher than the reference voltage kb of the comparator 111b, the comparator 111b is turned on, the photocoupler 121b is turned on, and the transistor 122b is turned on.
becomes conductive, and the common Com becomes grounded.

As mentioned above, the polarity detection circuit 11 is installed on the power panel 1 of the machine tool.
and the polarity switching circuit 12, it becomes possible to switch the polarity of the power control panel 1 of the machine tool in accordance with the polarity of the sequencer 2.

〔Effect of the invention〕

As described above, according to the power control board for a machine tool of the present invention, it is possible to connect a sequencer regardless of the polarity of the sequencer connected to the power control board, and it is possible to design and produce a power control board for each sequencer. This makes it possible to quickly deal with sequencer model changes, and it is economical because there is no need to prepare excess inventory.

Additionally, since the polarity is automatically switched by connecting to a sequencer, it is possible to prevent damage to the device due to incorrect connection.

Note that there is no need to prepare a dedicated circuit for the connection terminal on the sequencer side for the polarity detection circuit, and it can also be used with conventional sequencers.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a power panel of a machine tool according to the present invention, FIG. 2 is a circuit diagram showing an example of a polarity detection circuit and a polarity switching circuit in the power panel of a machine tool according to the present invention, and FIG. Figures (a) and (b) are circuit diagrams showing an example of an interface circuit of a conventional machine tool power board. 1... Powerful electrical panel of a machine tool, 2... Sequencer, 11... Polarity detection circuit, 12... Polarity switching circuit, 16...・Interface circuit, 111a, 11
1b...Comparator, 121a, 121b.
...Photo coupler, 122a, 122b...
...Transistor. ( ) figure( )

Claims (3)

[Claims] (1) In a setting method for a power control panel of a machine tool that is controlled using a sequencer, the polarity of the common wire of the interface circuit of the power control panel is changed using a switch in accordance with the polarity of the interface circuit of the sequencer. A method for setting up a powerful electrical panel for a machine tool. (2) The polarity of the sequencer is determined by detecting the current or voltage at the input terminal or output terminal of the sequencer connected to the power board, which is equipped for sending and receiving external signals, and the polarity of the sequencer is determined, and the Claim 1 characterized in that the polarity of the common line is automatically switched.
How to set up the power panel of the machine tool described. (3) A polarity detection circuit that determines the polarity of the interface circuit of the sequencer by detecting current or voltage in a heavy-duty electrical panel of a machine tool that is controlled using a sequencer, and a polarity detection circuit that determines the polarity of the interface circuit of the sequencer by detecting current or voltage, and detects the common wire of the heavy-duty electrical panel based on the determination result. A strong electrical panel for a machine tool, characterized in that it has a polarity switching circuit for switching the polarity of the machine tool.