JPS6169379A - Self-holding reversible interlock circuit - Google Patents

Abstract

PURPOSE:To prevent a shortcircuit between phases of a solid state contactor by switching between normal and reverse in a time delay. CONSTITUTION:When an input contact 2 is closed, the output signal of a NAND circuit 11 becomes 'H', the output of a NAND circuit 13 becomes 'L', and this state is held. Thus, a transistor TR21 is turned ON to close a solid state contactor 25. A capacitor C21 is charged by the output of a NOR circuit 31, and the output of a NOR circuit 24 is held at 'L'. When an input contact 4 is closed in this state, the output of the NAND circuit 13 becomes 'H'. On the other hand, the capacitor C21 is discharged by the output 'L' of the NOR circuit 21, an interlock is released after the prescribed time, a transistor TR22 is turned ON, and a solid state contactor 26 is closed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an interlock circuit, and more specifically, it prevents short circuits between phases in the main circuit during forward and reverse operation of a reversible solid state contactor, and also enables self-holding operation. This invention relates to a self-holding reversible interlock circuit.

[Conventional technology]

FIG. 6 shows a self-holding type reversible interlock circuit of an electromagnetic contactor. The magnetic contactor has a main surface FN4 contact and an auxiliary circuit contact, and the auxiliary circuit contact is used to provide a self-holding circuit, an electrical interlock, and a mechanical interlock to prevent short circuits between phases of the main circuit. I'm trying to prevent it. The self-holding circuit has a normal rotation side a contact (30
1 and a contact 01) on the reverse side.

Further, the electrical interlock is constituted by a b contact 02 on the forward rotation side and a b contact 01 on the reverse rotation side. This electrical interlock prevents normal rotation by closing the button (b) on the forward rotation side.When the A contact (301) of the The b-contact Oj on the side is used to interlock the reverse side from driving.For the reverse side, reset the circuit once using the button (G), and then turn the reverse side button again. Close the button (G).Furthermore, mechanical interlock (To)'□
uses a movable part operated by an electromagnet to prevent the movable part from moving even if the coil of one electromagnetic contact is energized while the other electromagnetic contact is operating. .

[Problem that the invention seeks to solve]

By the way, solid-state contactors consist of a thyristor (triac) that corresponds to the main circuit contacts of the electromagnetic contactor, and there is no part that corresponds to the auxiliary circuit contacts of the electromagnetic contactor, and there is no mechanically operating part. There is no. Therefore, conventional solid-state contactors are not equipped with a self-holding circuit and electrical interlock using auxiliary circuit contacts, unlike electromagnetic contactors, and therefore have a problem in that they cannot perform self-holding operation. Furthermore, a mechanical interlock using a mechanically operating part such as an electromagnetic contactor is not provided, and short circuits between phases of the main circuit cannot be prevented.

The present invention was made for the purpose of solving the above problems.
The present invention provides a self-holding operation reverse interlock circuit for models that do not have an auxiliary contact circuit or mechanically operating parts, such as a double-state contactor.

Means for Solving Problem C] Therefore, the present invention provides a forward rotation side self-holding circuit, a forward rotation side solid state contactor drive circuit, a reverse rotation side self-holding circuit,
Reverse rotation solid state contactor drive circuit, forward rotation solid state contactor reset circuit, reverse rotation 1111
Solid state contactor reset lI-! A self-holding operation reverse interlock circuit is constructed by the L path and the forward/reverse rotation interlock circuit. Here, the forward rotation side and reverse rotation side self-holding circuits are the forward rotation side and reverse rotation side self-holding circuits, respectively.
The 111 solid-state contactor is self-held, and the forward-side and reverse-side solid-state contactor drive circuits drive the forward-side and reverse-side solid-state contactors by the output signals of the forward-side and reverse-side self-holding circuits, respectively. , the solid-state contactor reset circuits are self-holding, and the forward-side and reverse-side solid-state contactor reset circuits reset the forward-side signal when the forward side is self-holding and when the reverse side signal is input, and when the reverse side is self-holding, the forward side signal is input. When is input, the self-holding of the solid-state contactors on the forward and reverse rotation sides is released, and the forward/reverse rotation interlock circuit releases the self-holding of the solid-state contactors on the forward and reverse rotation sides. The operation of the side solid state contactor drive circuit is locked for a predetermined interlock time.

[Effect]

With the above configuration, the solid state contactor on the forward rotation side is self-held by inputting the forward rotation side signal, and the solid state contactor on the reverse rotation side is self-held by inputting the reverse rotation side signal, and the solid state contactor on the forward rotation side is self-held. When a reverse side signal is input when the contactor is self-holding, or when a forward side signal is input when the reverse side solid-state contactor is self-holding, the forward side solid-state contactor Self-holding or reverse rotation (all solid-state contactors self-holding is released, and after a predetermined interlock time has elapsed, the reversing solid-state contactor or forward rotation (all solid-state contactors are self-holding. Self-maintaining operation of solid-state contactors with no parts is possible,
Further, by providing an interlock time, short circuits between phases can be prevented.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.
p.

FIG. 1 is a circuit diagram of a self-holding operation reverse interlock circuit according to the present invention. In Figure 1, (1) is an AC power supply, (2) is a normal rotation side signal input contact, (Dl) is a half-wave rectifier diode, (R1), (R2), (R6), (R4)
, (R5) is a resistor, (3) is a photocoupler, (C1) is a capacitor for setting a hash level, and (D2) is a discharge diode. When the normal rotation side signal input contact (21) closes due to the input of the normal rotation side signal, the AC power supply (AC signal of 11 is connected to the contact (
2) and flows to the diode (Dl) via terminal A,
This diode (Dl) performs half-wave rectification, and the current flows through the voltage dividing resistor (R2) and the photodiode (D3) of the photocoupler (3) via the resistor (R1). Hood・□ When the phototransistor (TRI) of the photocoupler (3) turns on in response to the half-wave rectified AC signal flowing through the odd diode (D6), the phototransistor (TR,
When 1) is off, resistor (R,'5) and resistor (R,
4) The capacitor (C1), which was being charged by applying 2 voltage Vcc through 2, transfers the charged charge to the resistor (C1).
R5), diode (D2) and transistor (TR
1) Discharge through 4. Therefore, chanter B rotates forward 1j
When the ll signal input contact (2) is open, it is at a high level ゛■('', and when the contact (2) is closed, the AC signal is at a low level when it is positive, and when it is negative it is at a low level. Becomes a high level TL H#. Make it a 1st shift and reverse 1
111 signal input When the reverse side signal input contact (4) closes, the terminal (Q changes from high level ""H" to low level °
'L'K:1' (PL, t & IJ upper set number input contact (when 51 closes, terminal) level will change.

Next, ((1), (121, (13), +14) are Nando 101 paths, (1)11), (Dl2-) are backflow check diodes, (R11), (R12), (R13) ,(
R14) is a resistance, and these parts allow forward rotation in
Forward rotation side self-holding circuit that outputs a signal to self-hold the solid state contactor (25), reverse rotation side self-holding circuit that outputs a signal to self-hold the reverse rotation side solid-state contactor (20), normal rotation side When the solid state contactor (c) is self-holding and the reverse side signal input contact (4) closes, that is, when the reverse side signal is input, the forward side solid state contactor (2□
Forward rotation side solid state contactor reset circuit to release the self-holding of □□, when the reverse rotation side solid state contactor (c) is self-holding, when the forward rotation side signal input contact (2) closes, i.e. When the forward rotation side signal is input, the reverse rotation side solid state contactor (
4) When the reversal (1111 solid state contactor reset circuit) and reset signal input contact (5) are closed, the self-holding of the reversing solid state contactor (1) is closed. They both release the hold and form a 7-bit circuit.

Next, 龜υ, ■, C21, Q41i/7 circuit, (C21
), (C22) are time capacitors, (D21), (
D22) is a charging diode, (R21), (R22)
, (R23), (R24), (R25), and (R26) are resistors, and (TR21) and (TR22) are transistors, and these parts allow the p-normal rotation to occur according to the output signal of the normal rotation side self-holding circuit. -Solid state contactor C ((
The forward rotation side solid state contactor drive circuit (26) drives the forward rotation side solenoid contactor (26) and rotates the reverse rotation side solid state contactor (26) by the output signal of the reverse rotation side self holding circuit.
The reverse rotation (1f11 solid-state contactor drive circuit) that drives and self-holds the forward rotation 1i11 solid-state contactor (after releasing the self-holding of the two reverse-side solid-state contactors (a), and the reverse rotation (It constitutes a forward/reverse interlock circuit that locks the operation of the solid state contactor drive circuit or the operation of the forward/reverse 1 solid state contactor drive @(b) path for a predetermined interlock time.) The overall operation of the self-holding operation reverse interlock circuit according to the invention will be explained with reference to the timing chart shown in FIG.

First, input contacts (2), (41, and fil are both 1 (when they are off (see Figure 2 (a), (bl, and c)), and phototransistors (TR1) and (TR2) are off. Tona 9, NAND circuit Il+, 12), +131.
(+41 is the input terminal (b), (d), ge), (g) K
Since the signal 1L" is input to the signals 1H", (e), (2)), the NAND circuits f13) and +141 output the signal "H". NAND circuit (13), the output of 141 is
level −H”, the Noah circuit (2υ,
('', +29) is input terminal (i), (to), (n
) is inputted with a signal "H" and outputs a signal "L". Therefore, transistors (TR21), (TR22) are off and the solid-state contactor ('!L f
x6) is turned off (see FIG. 2(di, (e)).

Next, when the input contact (2) turns on at time t1 (second
(See Figure (a)), the transistor (TR1) is turned on, so the charge in the capacitor C1 is discharged.

As a result, the signal "L" is input to the input terminal (h) of the NAND circuit (11), and the NAND circuit (13) outputs the signal "L".

NOR circuit CD, (2'3J is a NAND circuit (when one output signal "L" is input, it outputs a signal "H". As a result, the transistor (TR21) is turned on, and the solid state contactor (four turns on (Figure 2(d)
)reference).

, ;B, -・7'"0"Py IICfx
O-・0=7, and even if the signal "'H" is input manually to the NAND circuit (lυ), the output of the NAND circuit (13) is returned to the NAND circuit (111), so the NAND circuit (1:1 The output signal "L" of the contactors (1 to 2) is kept on.

Also, due to the output signal "'H" of the NOR circuit 1'J+1,
The capacitor (C, 21) is charged and the NOR circuit (24)
When the signal "H" is input to nl, the output signal "L#" of the NOR circuit (2) is held. Therefore, the contactor IE6) remains off.

Next, when the input contact (4) turns on at time t2 (second
(see figure (b)), the transistor (TR2) is turned on, so the charge in the capacitor (C2) is discharged.

Therefore, a diode (D12) is connected to the NAND circuit f+3).
When the signal "L" is inputted through the transistor (TR21), the NAND circuit 1131 outputs the signal "H". is turned off, and the solid-state contactor (koji is turned off (see Figure 2 (d)). On the other hand,
The capacitor (C21) is charged by the output signal "L" of the NOR circuit C2υ, and the output signal "L#" of the NOR circuit (24) is locked during the non-interlock time t which is the charging time of the capacitor (C21). Also, Nando circuit t!
3 outputs the signal "H" to the NAND circuit (14) by inputting the signal "L", and the NAND circuit (141 outputs the signal "L", which returns to the NAND circuit (13), so the NAND circuit (141) The output signal "L" of the circuit 114) is self-maintained.

After the interlock time elapses, the NOR circuit C24) outputs the signal 1H'' by the output signal 1L'' of the NAND circuit (!).As a result, the transistor (TR22) turns on, and the solid state contactor C24 turns on (the first 2
(See figure (e)). In addition, the Noah circuit (the rib outputs the signal ""H" and charges the capacitor (C22), and the Noah circuit 1
Outputs the signal "■" to the 2nd row, and turns on the output signal "L" of the NOR circuit (231).

Next, when the input contact 1Fil closes at time t3 (see Fig. 2 (C)), the transistor (TR3) turns on,
Outputs signal "L" to NAND circuit (+3, +141).

As a result, the NAND circuit tlL (141 is the signal @H''
Output m and release self-holding. As a result, the output of the NOR circuit C~, (24) becomes "L", and the transistor (
TR21) and (TR22) are turned off, and the solid state contactors Ca and (A) are turned off.

〔Effect of the invention〕

As explained above, according to the present invention, the forward rotation side solid state contactor and the reverse rotation side solid state contactor are self-maintained by inputting the forward rotation side signal and the reverse rotation side signal, respectively, and the forward rotation side solid state contactor is When a reverse rotation side signal is input when the solid-state contactor is self-holding, or conversely, when a forward rotation side signal is input when the reverse rotation side solid-state contactor is self-holding, it will switch to the forward or reverse rotation side. The self-retention of the solid-state contactor on the side is released, and the solid-state contactor on the reverse rotation or forward rotation side is made to self-retain after a predetermined interlock time has elapsed. Phase-to-phase short circuits can be prevented.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a self-holding type reversible interlock circuit according to the present invention, Fig. 2 is a timing chart showing the operation of the self-holding type reversible interlock circuit of Fig. 1, and Fig. 6 is a circuit diagram of a self-holding type reversible interlock circuit according to the present invention. FIG. 2 is a circuit diagram of a self-holding reversible interlock circuit. 2.4.5... Signal input contact, 6... Photo coupler, 11 to 14... NAND circuit, 21 to 24...
NOR circuit, 25.26...So11 state contactor. Agent Patent Attorney Sanro Kimura Procedural Amendment (Voluntary) June 28, 1985

Claims (1)

[Claims] A forward rotation side self-holding circuit outputs a signal that self-holds the forward rotation side solid state conductor in response to input of a forward rotation side signal, and a forward rotation side solid state contactor is driven by the output signal of the forward rotation side self holding circuit. A forward-side solid-state conductor drive circuit that causes the solid-state conductor to self-hold, a reverse-side self-holding circuit that outputs a signal to self-hold the reverse-side solid-state conductor in response to input of a reverse-side signal, and a reverse-side self-holding circuit that outputs a signal to self-hold the reverse-side solid-state conductor, and a reverse rotation based on the output signal of the reverse-side self-holding circuit. A reverse side solid state conductor drive circuit drives the side solid state conductor to self-hold, and when the forward side solid state conductor is self holding and a reverse side signal is input, the forward side solid state conductor is The forward rotation side solid state contactor reset circuit releases self-holding, and when the reverse rotation side solid state conductor is self-holding and the forward rotation side signal is input, the self-holding of the reverse rotation side solid state conductor is released. The reverse solid-state conductor reset circuit operates the reverse solid-state conductor drive circuit or drives the forward solid-state conductor after the self-holding of the forward solid-state conductor is released or after the self-holding of the reverse solid-state conductor is released. A self-holding type reversible interlock circuit characterized in that it includes a forward rotation/reverse rotation interlock circuit that locks the operation of the circuit for a predetermined interlock time.