JPH0157947U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a block diagram of the control circuit of the present invention, Figure 2 is a block diagram of the control circuit of the present invention.
The figure is a circuit diagram specifically showing Figure 1, and Figure 3 is a circuit diagram specifically showing Figure 2.
Fig. 4 is a block diagram of a modified embodiment, Fig. 5 is a circuit diagram specifically showing Fig. 4,
FIG. 6 is a time chart showing the operating status of the second detection circuit shown in FIG. 10... Control means, 11... Automatic return type forward/reverse changeover switch, 12... Self-holding relay circuit, 13
... Switching circuit, 14 ... Transistor switch, 15 ... Time limit timer circuit, 16 ... Detection circuit for detecting excessive current during operation, 17 ... Second detection circuit.

Claims (1)

[Claims for Utility Model Registration] 1. A driven member is rotated or linearly reciprocated by an electric drive system including a motor that rotates forward and reverse, and the driven member is moved to a predetermined position by a mechanical drive regulating means provided in the electric drive system. The control device detects the motor current that increases with the stop and stops the motor, the control device comprising: an automatic return type forward/reverse changeover switch that outputs an operation signal for the drive system; A time-limited timer circuit outputs a time-limited signal that masks the motor current detection output when starting the motor to prevent malfunctions during startup, and has a detection level that follows increases and decreases in motor current with a certain level difference, and prevents excessive overshoot current. For this purpose, there is a detection circuit for detecting overcurrent during operation which is activated by comparing with the detection level due to the difference in circuit time constant, and the motor is started by the operation signal and the time limit signal, and the motor is activated by the output of the detection circuit. 1. A control circuit for an electric mechanism, comprising: a control means for stopping the electric mechanism. 2. Mechanical drive regulating means provided in an electric drive system that rotates or linearly reciprocates a powered member by a motor that rotates in forward and reverse directions stops the driven member at a predetermined position, and reduces the motor current that increases with the stoppage. The control device detects and stops the motor, and includes an automatic return type forward/reverse changeover switch that outputs an operation signal for the drive system, and an automatic return type forward/reverse changeover switch that outputs an operation signal for the drive system, and a switch that is activated by the operation signal and masks the motor current detection output when the motor is started. It has a time limit timer circuit that outputs a time limit signal to prevent malfunction of the motor, and a detection level that follows increases and decreases in motor current with a fixed level difference, and operates by comparing the detection level with the time constant difference in case of excessive overshoot current. a first detection circuit for detecting overcurrent during operation; and a second detection circuit for detecting overcurrent during startup, which operates by comparing with a reference current value that is smaller than the motor startup inrush current and larger than the steady maximum operating current value at low temperatures. A control circuit for an electric mechanism comprising a detection circuit and a control means for starting a motor according to the operation signal and the time limit signal and stopping the motor according to the output of the first or second detection circuit. 3. The control circuit for the electric mechanism according to item 1 or 2, wherein the automatic return type forward/reverse changeover switch operates a plurality of the electric systems at once. 4. The control means includes self-holding relay circuits for forward and reverse rotations that are activated by the forward or reverse operation signal of the automatic return type forward/reverse changeover switch to rotate the motor in the forward and reverse directions, the detection output of the first detection circuit, and the detection output of the first detection circuit. A transistor switch that has a base input circuit that forms a parallel input element with a time limit signal of a timer circuit and is connected in series with the relay circuit to operate the circuit, and a motor that rotates the motor in the forward and reverse directions using the relay contacts of the relay circuit. 4. A control circuit for an electric mechanism according to claim 1 or 3, comprising a driving switching circuit. 5. The control means includes self-holding relay circuits for forward and reverse rotations that are activated by the forward or reverse operation signal of the automatic return type forward/reverse changeover switch to rotate the motor in the forward and reverse directions, and a pull-up detection output of the first detection circuit. a transistor switch having a base input circuit forming a parallel input element by a diode forward output, a time limit signal of the timer circuit, and a detection output of the second detection circuit, and connected in series to the relay circuit to operate the circuit; 4. The control circuit for an electric mechanism according to claim 2 or 3, comprising a switching circuit for driving a motor to drive the motor in forward and reverse directions using relay contacts of the relay circuit.