JPS63209488A - Operation control unit of relay for controlling rotation of motor - Google Patents

Abstract

PURPOSE:To permit operation control switches to be composed of semiconductors, by providing a timer circuit and an interlock circuit to a normal rotation operation control circuit and a reverse rotation operation control circuit. CONSTITUTION:When a normal rotation operation control switch A is turned ON, a timer circuit 12 outputs the normal rotation signal after the appointed time. An interlock circuit 13 gives the 'ON' signal to a solidstate relay 23 for normal rotation through an output circuit 15 when the normal rotation signal is given. At this time, interlock circuits 18 and 19 on the reverse rotation operation control circuit side will perform interlock action of reverse output and prevent the phase-to-phase short-circuit caused by turning 'ON' of a solid- state relay 24 for reverse rotation. On the other hand, if a reverse operation control switch B is turned ON in normal rotation operation, the reverse rotation signal will rise after the normal rotation signal falls by a timer circuit 17. The phase-to-phase short-circuit can thereby be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention applies a forward rotation drive voltage to a motor connected to its output terminal by turning on the contact of a forward rotation control relay such as a solid state relay. When the contact of the reverse control relay is turned on, a reverse drive voltage is applied to the motor connected to its output terminal to reverse the motor, and the forward rotation occurs in response to a forward rotation signal. An operation control unit that provides a contact-on output (forward rotation output) to the input terminal of the control relay, and a contact-on output (reverse rotation output) to the input terminal of the reverse control relay in response to being given a reverse rotation signal. Regarding.

(Prior Art and its Problems) FIG. 6 is a schematic block diagram showing a circuit example of a conventional operation control unit of this type, a solid state relay as a control relay whose operation is controlled by the operation control unit, and a motor. . As shown in the figure, this operation control unit a has input terminals al and a for forward rotation signals and reverse rotation signals.
2, and each output terminal a for forward rotation output and reverse rotation output 7. an output circuit a4 having an output circuit a8, a timer circuit a5 provided between both circuits and controlling the input timing of the forward rotation (or reverse rotation) signal and the output timing of the forward rotation (or reverse rotation output), respectively; Interlock circuit a to eliminate mutual interference between side and reverse side
6.

The six input terminals al and a2 of the input circuit a3 have manual switches bl for forward rotation signals and reverse rotation signals, respectively.

AC power supply C is connected via b2. Also, each output terminal a7 of the output circuit a4. A8 has solid state relays DL for forward rotation and reverse rotation.

(Twelve input terminals d3 and d4 are connected.

Each output terminal d5 of solid state relay di, d2 for forward rotation and reverse rotation. d6 is commonly connected to the AC voltage application terminal el of the induction motor e.

In this operation control unit a, when the motor e is to be rotated in the forward direction, by turning on the forward rotation signal input switch b1, a forward rotation signal is applied to the input circuit a3 thereof, and the output terminal a7 of the output circuit a4 is Outputs normal rotation output. The normal rotation output is given to the input terminal d3 of the solid state relay dl.

Then, the contact of the solid state relay di turns on, and a drive voltage for normal rotation is applied to the motor e connected to its output terminal d5.

The same applies to reversing the motor, so the explanation thereof will be omitted.

By the way, in this operation control unit a, each input terminal al of the input circuit a3 to which a forward rotation signal or a reverse rotation signal is applied
, a2 are the corresponding operation control switches b1. Since it was configured to be connected to the AC power supply C via b2, its operation control switch bl.

b2 is constituted by a relay contact, and the relay contact is turned on and off by controlling the energization of the relay coil.

However, in such an operation control unit, since a forward rotation signal or a reverse rotation signal is obtained by turning on and off a relay contact, there is a problem that there is a delay in the operation time, that is, the response is poor.

In addition, in this operation control unit, for example, the collector/emitter of a transistor is directly connected between the input terminal connected to the relay contact and the ground, and a forward rotation signal or a reverse rotation signal is generated by turning the transistor on and off. It could not be applied to the so-called semiconductor output method.

(Object of the Invention) An object of the present invention is to provide an operation control unit for a relay for controlling rotation of a motor, which has excellent responsiveness and can be applied to a semiconductor output method.

(Structure and effects of the invention) The present invention takes the following configuration to achieve the above object.

In other words, the operation control unit of the present invention has a forward rotation control circuit connected to the input terminal of the relay for controlling the forward rotation of the motor, and a reverse rotation control circuit connected to the input terminal of the relay for controlling the reverse rotation of the motor. circuit, and a DC power supply for at least both of the operation control circuits.

The forward rotation control circuit includes an input circuit to which a forward rotation signal is given in response to the on/off of a forward rotation control switch of the motor, and an input circuit that outputs a forward rotation output in response to the forward rotation signal to control the forward rotation of the motor. An output circuit that is applied to the relay input terminal for the motor, an interlock circuit that turns off the forward rotation output while the motor is running in reverse, and an output circuit that turns off the forward rotation output when the motor is in reverse operation control mode. A timer circuit is provided that enables a forward rotation operation control output to be output after a predetermined period of time has elapsed since the turn-off.

- The reverse rotation control circuit also includes an input circuit that receives a reverse rotation signal in response to the on/off of a motor reverse rotation control switch, and an input circuit that outputs a forward rotation output in response to the reverse rotation signal to a relay for controlling the motor reverse rotation. An output circuit that is applied to the terminal, an interlock circuit that turns off the reverse rotation output during forward rotation of the motor, and a predetermined period of time after the output of the forward rotation control circuit is turned off when switching from the forward rotation control mode to the reverse rotation control mode. and a timer circuit that enables a reverse operation control output to be output after the elapse of time.

The present invention is characterized in that the common potential can be input to each of the input circuits as a forward rotation signal or a reverse rotation signal when the contact of each of the operation control switches is in an on state.

In the operation control unit of the present invention having the above configuration, the forward rotation or reverse rotation signal for rotating the motor in the forward or reverse direction is transmitted to the common 11m1 by turning on the contact of the operation control switch.
．． Since it can be made into a U, it becomes possible to construct the operation control switch with a semiconductor such as a transistor. The operating speed of such a semiconductor switch is faster than that of a relay switch. As a result, the problem of operating speed when configured with relays as in the past will be resolved.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an operation control unit of a motor rotation control relay (a forward rotation control relay and a reverse rotation control relay) according to an embodiment of the present invention, and a rotation control relay controlled by this operation control unit. It is a circuit block diagram of a solid state relay (abbreviated as 5SR) and a motor connected to the solid state relay, and FIG. 2 is a detailed circuit diagram of its operation control unit.

In these figures, IO is the operation control unit.

The operation control unit IO performs reversible operation control of the motor, and includes a motor forward rotation operation control circuit, a reverse rotation operation control circuit, and an operation stop control circuit.

The forward rotation operation control circuit includes an input circuit 11, a timer circuit 12, an interlock circuit 13, 14, and an output circuit 5, and the reverse rotation operation control circuit includes an input circuit 16, a timer circuit 17,
It includes interlock circuits 18 and 19 and an output circuit 20. An input circuit 21 is provided as an operation stop control circuit.

Further, the operation control unit IO has a built-in DC power supply 22.

23 is a normal rotation control solid state relay for controlling the rotation of the motor in the forward rotation direction, and 24 is a reverse rotation control solid state relay for controlling the rotation of the motor in the reverse rotation direction. These solid state relays 23 and 24 are connected to three light emitting diodes and one for each phase individually.
This is a well-known device consisting of two triacs and other necessary circuit components (not shown).

25 is a three-phase induction motor whose operation is controlled in each operation control mode of forward rotation, reverse rotation, and stop; 26 is a no-fuse breaker;
27 is an AC power source. A is a normal rotation operation control switch that is operated when the motor 25 is operated in the normal rotation, and B is a normal rotation operation control switch for the motor 2.
5 is a reverse operation control switch that is operated when the motor 25 is operated in reverse, and C is a stop operation control switch that is operated when the motor 25 is stopped. Each of the operation control switches A, B, and C is shown as a contact point in the drawing, but in reality, it is constituted by a semiconductor switch, for example, a transistor, and corresponds to its collector/emitter or its contact point. When a drive signal for forward or reverse rotation is applied to the base of the transistor, the transistor is turned on, that is, each of the operation control switches A, B, and C is turned on.

In the forward rotation operation control circuit of the operation control unit IO,
Its input circuit 11 includes a transistor TRI whose base is connected to the operation control switch A via resistors R1 and R3, and its timer circuit 12 includes a transistor Tr (2) and the base of the transistor TR2 and grounded. The interlock circuit 13 includes an inverter circuit G2, G4 and a Nant gate G3, and a capacitor C3 connected in parallel to the collector and emitter of the transistor TR2. The interlock circuit 14 includes a capacitor C2 and a transistor TR2 shared with the timer circuit 12, a Nant gate GI, and the output circuit 15 includes transistors TR3 and TR4 connected to Darlington.
Furthermore, a diode D2 having another interlock function is provided.

Since the reverse rotation operation control circuit side has the same configuration as the forward rotation operation control circuit side, only the reference numerals are given. The operation stop control circuit includes an input circuit 21 . The output section of this input circuit 21 is connected to diodes D4 and D as shown in *a in the figure.
24 cathodes, respectively.

Next, the operations of the forward rotation, reverse rotation, and stop operation control circuits will be explained with reference to the time chart shown in FIG. Figure 4 (a
) is a forward rotation signal given to the input circuit 11 when the forward rotation operation control switch A is on, and FIG. 4(b) is a reverse rotation signal given to the input circuit 16 when the reverse rotation operation control switch B is on. FIG. 4(C) shows a stop signal given to the input circuit 21 when the stop operation control switch C is on, and FIG. 4(d) shows a normal rotation output appearing at the output of the output circuit 15 in response to the normal rotation signal. , FIG. 4(e) is a time chart of each reverse rotation output appearing at the output of the output circuit 20 in response to the reverse rotation signal.

As shown in these figures, the normal rotation operation control switch A is normally off. In other words, the potential of the power supply side contact of switch A is at the power supply potential. and,
In order to rotate the motor 25 in the normal direction, the operation control switch A is turned on as shown in the period from time t1 to time t3 in FIG. 4(a). This is a state in which the power supply side contact and the common side contact of switch A are short-circuited, and the power supply side contact is at the common potential (ground potential in the embodiment). As a result, input circuit 1
A normal rotation signal having a waveform shown at time tl-t3 in FIG. 4(a) is applied to the base of transistor TRI of No. 1. The normal rotation signal is applied to the input circuit 11 and then to the timer circuit 12. The timer circuit 12 supplied with the normal rotation signal charges the capacitor C3 with a voltage corresponding to the normal rotation signal at a rate according to its time constant. The interlock circuit 13 operates at a time t2 after a predetermined time TI has elapsed from the time tl when the forward rotation operation control switch A was turned on and the forward rotation signal was applied.
It operates in response to the output of the timer circuit 12 and outputs the normal rotation signal to the output circuit 15.

The output circuit 15 receives the time t from the interlock circuit 13.
2, the first stage transistor Trt3 is turned on, and at the same time, the next stage transistor TR4 is turned on.
can be turned on. This causes the output circuit 15 to
The normal rotation output shown at times t2 to t4 in FIG. 3(d) is output to the input terminal of the solid state relay 23 for normal rotation. This causes the motor 25 to rotate forward.

In this case, the interlock circuit 13 on the forward rotation operation control circuit side
．． 14 prohibits the output of the forward rotation output from the output circuit 15, that is, does not perform an interlock operation, and the corresponding interlock circuits 18 and 19 on the reverse operation control circuit side perform an interlock operation of the reverse rotation output to prevent the forward rotation solid state. This prevents phase-to-phase short circuits caused by simultaneous turning on of the state relay 23 and the reversing solid state relay 24. That is, in the forward rotation control mode, the output of the timer circuit 17 on the reverse rotation control circuit side is applied to one input portion of the Nant gate G3 of the interlock circuit 13 via the inverter circuit G2. Further, a normal rotation signal, which is the output of the timer circuit 12 on the normal rotation operation control circuit side, is given to the other human power section of the Nant gate G3. As a result, the interlock circuit 13 outputs its normal rotation signal to the output circuit 5 without performing an interlock operation.

On the other hand, the interlock circuit 18
3, the output of the timer circuit 12 on the forward rotation control circuit side is given to one input section of 3 through the inverter circuit G22, and the output of the timer circuit 17 on the reverse rotation control circuit side is given to the other input section. No signal is provided to output circuit 20. Further, the output circuit 20 is also interlocked via the diode D2. Furthermore, one input part of the Nant gate G21 of the interlock circuit 19 receives the input circuit 11 output on the forward rotation operation control circuit side, and the other input part receives the output circuit 15 output on the forward rotation operation control circuit side. Since the Nandt gate G21 outputs a high potential output and turns on its transistor TR22, no inversion signal is provided to the output circuit 20.

In this way, no reverse rotation output is output during the forward rotation operation control mode. On the other hand, during the reverse rotation control mode, the interlock circuits 13 and 14 on the forward rotation operation control circuit side prevent the output of the normal rotation output. Note that from time t5 to time t shown in FIG. 4(b)
The fact that a reverse rotation signal is applied to the rotation signal 7 and a reverse rotation output is outputted from time t6 to t8 as shown in FIG.

Next, a normal rotation signal is applied to the input circuit 11 on the normal rotation operation control circuit side from time t9 to t13 shown in FIG. 4(a), and at time tlO-t12, not shown in FIG. When the forward rotation output is being output from the time tll-t1
5, the case where a reverse rotation signal is applied to the input circuit 16 on the reverse operation control circuit side will be explained. In this case, time t9
The normal rotation signal shown in FIG. 4(a), which falls at the time, is applied to the input circuit 11 on the normal rotation operation control circuit side.

Then, a normal output that rises at time 110 in FIG. 4(d) is output from the output circuit 15. In this case, the interlock circuits 13 and 14 on the forward rotation control circuit side are not in the interlock operation state as described above, and the interlock circuits 18 and 19 on the reverse rotation control circuit side are in the interlock operation state, so the output is output. Even if the circuit 15 outputs a normal rotation output, the output circuit 20 does not output a reverse rotation output.

Next, a reverse rotation signal is applied to the input circuit 16 on the reverse operation control circuit side from time 111 to t15 in FIG. 4(b). In this state, if the control solid state relays 23 and 24 are turned on at the same time with the control switches A and B in the state, a short circuit will occur between the phases.
12, the forward rotation output from the output circuit 15 on the forward rotation operation control circuit side falls and is no longer output, but the reverse rotation output is not output immediately, but is output at time t14 after a certain time lag period T2. Ru. That is, until the charge in the capacitor C22 of the interlock circuit 19 on the reverse operation control circuit side is discharged and its charging potential becomes below a predetermined value, the transistor TR22 is turned off and the reverse output becomes possible. is not output. The reason for this constant time lag is that solid-state relays include triacs, and if the output of the other side is output immediately after the forward or reverse output falls, there is a risk of a short circuit between the phases. It is from.

Contrary to the above, when the reverse rotation signal is given from time t17 to t21 and the normal rotation signal is given from time t19 to t23, similarly, after the reverse rotation output is output from time t18 to t20, a predetermined time lag period Time t22 after T2
A normal rotation output is output from to t24.

When a stop signal as shown in FIG. 4(c) is input to the input circuit 21 at time t25, during the period while the stop signal is being applied, the stop signal as shown in FIG. Even if the forward rotation signal and reverse rotation signal shown at time t27 in FIG. 4(b) are manually input, the corresponding forward rotation output and reverse rotation output are not output.

When its switch C is turned on, a low potential stop signal causes the diode D connected to its input circuit 21 to
This is because when the transistors TR3 and TR23 of each output circuit I5 and 20 are turned off via the output circuits I5 and D22 (*a), their forward and reverse rotation outputs are turned off.

FIG. 3 is a circuit diagram of an operation control unit according to another embodiment of the present invention, and FIG. 5 is a time chart for explaining the operation of the embodiment circuit of FIG.

In these figures, parts corresponding to those in FIGS. 2 and 4 are designated by the same reference numerals. The embodiment shown in FIG. 3 differs from that shown in FIG. 2 in the following points. That is, in this embodiment, between the timer circuit 12 on the forward/incorrect control circuit side and the output circuit 15, there is a latch circuit constructed of a flip-flop circuit, unlike the interlock circuit in the embodiment of FIG. 13' is inserted, and the interlock circuit I
4, a series circuit of a Nant gate G5 and an OR gate G6 is added. The output of the input circuit 21 on the stop operation control circuit side (indicated by C) is applied to the OR gate G6. Furthermore, a latch circuit 18 constructed of a flip-flop circuit as described above is provided between the timer circuit 17 on the reverse operation control circuit side and the output circuit 20.
' is inserted, and a series circuit of a Nant gate G25 and an OR gate G26 is added to the interlock circuit 19. Similarly to the above, the output of the input circuit 2I on the stop operation control circuit side is applied to the OR gate G6. Note that *a1*b are connected to each other. The rest of the configuration is the same as that shown in FIG. 2, so a description thereof will be omitted.

In other words, in the case of the embodiment shown in Fig. 2, the operation control switch is suitable for manual operation, whereas in the case of the embodiment shown in Fig. 3, the operation control switch is automatically operated. This is suitable when the switch is turned on and off in a short period of time. That is, the one shown in FIG. 3 is effective when the forward rotation signal, reverse rotation signal, or stop signal is pulse-like as shown in the time chart of FIG. 5.

For example, at time t50 in FIG. 5(a), when a short normal rotation signal like a pulse is applied to the input circuit 11 on the normal rotation operation control circuit side, the normal rotation signal passes through the input circuit 11 and the timer circuit 12. The signal is then input to the input terminal PR of the latch circuit 13'. The latch circuit 13', which is given such a pulsed normal rotation signal, outputs a normal rotation output from its output terminal Q as shown at time t51 in FIG. The normal rotation output is latched until the signal is applied. In addition to the output from the Nant gates G5 and G25 connected in series to the OR gates G5 and G26, the clear signal is also used for the forward rotation operation control circuit side as shown in *b and *C, respectively. The output from the output terminal Q of the latch circuit 18' on the control circuit side and the input circuit 21 on the stop operation control circuit side, and the output terminal Q of the latch circuit +3' on the forward operation control circuit side on the reverse operation control circuit side. This corresponds to the input circuit 21 on the stop operation control circuit side. Note that the other time charts in FIG. 5 are the same as those in FIG. 4, so a description thereof will be omitted.

[Brief explanation of the drawing]

FIG. 1 is a schematic circuit diagram of an operation control unit according to an embodiment of the present invention, a rotation control relay and a motor whose operation is controlled by the operation control unit, FIG. 2 is a circuit diagram of the operation control unit of FIG. 1, and FIG. A circuit diagram of another operation control unit, FIG. 4 is a time chart for explaining the operation of the operation control unit of FIG.
FIG. 5 is a time chart for explaining the operation of the operation control unit shown in FIG. FIG. 6 is a schematic circuit diagram of a conventional motion control unit, a rotation control relay and a motor whose motions are controlled by the motion control unit. In the figure, 10 is an operation control unit; 11. ．． 16 is an input circuit, 12.17 is a timer circuit, 13. +4°18.19
is an interlock circuit, 15.20 is an output circuit, 22 is a DC power supply, 23 is a relay for forward rotation control, and 24 is a relay for reverse rotation control.

Claims (1)

[Claims] (1) A forward rotation operation control circuit connected to the input terminal of the motor forward rotation control relay, a reverse rotation operation control circuit also connected to the input terminal of the motor reverse rotation control relay, and at least both of the aforementioned operation control circuits. The forward rotation operation control circuit includes: an input circuit that provides a forward rotation signal in response to on/off of a forward rotation operation control switch of the motor; and a forward rotation output circuit in response to the forward rotation signal. an interlock circuit that turns off the forward rotation output when the motor is running in reverse, and an interlock circuit that turns off the forward rotation output when the motor is running in reverse, and and a timer circuit that enables a forward rotation control output to be output after a predetermined period of time has passed after the output of the operation control circuit is turned off, and the reverse rotation control circuit outputs a reverse rotation signal in response to turning on and off of a reverse rotation control switch of the motor. an input circuit that is applied to the motor; an output circuit that responds to the reverse rotation signal and applies a forward rotation output to an input terminal of a relay for controlling the reverse rotation of the motor; and an interlock circuit that turns off the reverse rotation output during normal rotation of the motor; and a timer circuit that enables a reverse rotation control output to be output after a predetermined period of time has elapsed after the output of the forward rotation operation control circuit is turned off when switching from the forward rotation operation control mode to the reverse rotation operation control mode, and a contact point of each of the operation control switches. An operation control unit for a relay for controlling rotation of a motor, characterized in that the common potential can be input to each of the input circuits as a forward rotation signal or a reverse rotation signal in an on state.