SU451112A1 - Device for signaling the status of the actuator - Google Patents

Description

one

The invention relates to an automatic alarm; And; in particular, to devices controlling the operation of electromagnetic valves, solenoids in various automation systems and controls.

iiBbecTHO device for signaling the status of the actuator, containing a key connected to the positive pole of the power source and the indicator element.

However, the known device is not reliable in operation and cannot (operated with an executive mechanism that does not have a limit switch;

In order to increase the reliability of the device, a trigger executed on transistors, an amplifier, a differential unit and a load element were introduced into it, with one of the trigger inputs connected to one of the winding pins and performing a mechanism, followed by another load connected through differentiated and an amplifier with a trigger input, and the indicator element is included in the collector circuit of one of the trigger transistors.

FIG. An apparatus for signaling the status of an actuator; Fig. 2 shows a plot of the current flowing through the winding of the actuator during proper operation after supplying the supply voltage (.a; and in the event of malfunctioning of the actuator (b).

The device contains a load element (resistor) 1 connected in series with the winding 2 of the actuator, differentiating with capacitor 3 and resistor 4, amplifier 5, trigger with separate inputs on transistors 6 and 7 of indicator element B and key 9.

the device works as follows

In the INITIAL state, the key Y is open, power is not supplied to the circuit, the indicator element is not turned on.

1-1, after the key S supplies power, the transistor 7 opens and turns on the indicator element - the lamp 8. Simultaneously through the winding 2 of the actuator mechanism and the load element i, a current flows,% and the correct operation of the actuator at the time of the magnetic circuit flashing current, as shown Fig. 2a decreases sharply. The voltage removed from the load cell, fully corresponds to the current form, is differentiated by an E0 circuit consisting of a capacitor 3, a resistor 4, and through an inverting amplifier is fed to the base of transistor b, At the time of a sharp decrease in current, i.e. actuator actuation, current through the indicator element 8 is terminated.

Thus, with a working actuator, the indicator element is turned off.

 However, after the key 9 is closed, the actuator does not work, then the current in the winding 2, as shown in Fig. 26, increases smoothly. The impulse to turn on the transistor 6 does not form and the transistor 7 remains in the open state, resulting in the indicator element 8 including: .n, signaling malfunction of the actuator.

The device works in the same way, if in the winding 2 of the executive

The mechanism has a break or short circuit type fault. In the first case, the current through the load element i does not flow, in the second case, the current increases sharply and does not have a dip to form an opening pulse,

Both in the first and in the second cases, the indicator element 0 will be turned on with the key 9 closed, giving a fault signal.

Due to the absence of mechanical sensors in the final position, the device allows to control the operation of the actuator with high reliability and to signal its state.

IZIBRETENCH SUBJECT

A device for signaling the status of the actuator, containing a key connected to the actuating pole of the power source and an indicator element, characterized in that, in order to increase the reliability of the device, a trigger made on transistors, an amplifier differentiating the DC circuit, is introduced into it

and a load element, one of the trigger inputs is connected to one of the windings of the actuator mechanism, in series with the other output of which is connected a load element connected through a differentiator and an amplifier to another trigger input, and the indicator element is connected to the collector circuit of one of the transistors of the trigger.

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