SU399022A1 - DEVICE FOR THE CONTROL OF PARALLGETERS OF ELECTROMAGNETIC RELAYS AND ELECTROA / AGNETS - Google Patents

Description

one

There are known devices for controlling the values of electromagnetic relays and electromagnets containing a pulse generator, a resistor, a differentiating circuit, pulse shapers and logic elements “I.

To automatically control parameters and increase reliability, the proposed device is equipped with a coitrol mode switch and two threshold devices that are connected in parallel with the resistor. The outputs of the threshold devices are connected to the inputs of logical e. "I.

In the drawing, a block diagram is given of the on-1 device).

The controlled relay (electromagnet) / is connected to generator 2 through a resistor 3. The points of connection of the relay to the generator, the generator to the resistor and the resistor to the relay r; the switch to the terminals a-to switch 4, respectively. Terminals g and d switch and connector to the inputs of the threshold devices 5 and 6, made, for example, in the form of Schmitt triggers. The level of operation of the device 5 corresponds to the maximum value of the current (voltage) of the relay, and device 6 to the minimum value of the current (voltage) of the relay release. The connection point of the resistor 3 to the relay / is connected to the input of the differentiating circuit 7, the output of which is connected to the inputs of the drivers / and 9.

The output of the driver 8 and the switch to the input of the circuit "And 10, the second input of which is connected to the output of the threshold device 5. The output of the driver 9 is connected to the input of the circuit" And //, the second input of which is connected to you of the threshold input ycTpoiicTBa 6.

The device works as follows. In the initial state, the signals from the output of the generator 2 are missing, the relay (electromagnet) / de-energized, nap 15 at the inputs of the threshold devices 5 and 6 are zero, the output from the output of the differentiating circuit 7 and, therefore, the formers 8 and 9 are missing, the “And 10 11 do not issue a signal: s

"marriage.

In the case of a post-oscillator with a generator 2 of a smoothly increasing voltage on a resistor 3, an air conditioner proportional to the current flowing through the relay appears. Abrupt changes in the current through the relay coil, corresponding to the starting voltage supply from the generator, the time at which the relay is triggered, the starting voltage drop from the heater and the release of the relay, are released

differentiating circuit and formed in short pulses: the first two - by the shaper 8, the second two - by the shaper 9.

When the relay reaches a value equal to its maximum response current, with

the output of the threshold device 5 zhtinaet receive a signal. Since, with an operative relay, the level of its operation lies below the limit value, the signals in the AND 10 circuit do not match and the output signal of the circuit does not indicate a defect. The incompatibility of the current of operation of the relay with the requirements of the technical conditions of the relay is triggered later, as a result of which the AND 10 signals from the output of the threshold device 5 and the driver 8 coincide and the circuit issues a signal for the fault current.

When the voltage decreases from the output of the generator 2 to the value corresponding to the minimum release current of the relay (electromagnet) /, a single signal starts to come from the output of the threshold device 6. With a valid relay, this sigpal is issued after the last one is released, therefore, in the And 11 scheme, the signals do not match and the error signal is not output. If the release current of the relay does not match the requirements of the technical conditions, it is released later than the signal from the output of the threshold device 6, as a result of which this signal coincides with the signal from the output of the driver 9 and the And 11 circuit generates a release current fault signal.

When monitoring the tripping and releasing voltages, the tripping levels of the threshold devices 5 and 6 are set equal to the tripping and releasing voltages of the relays, respectively. The threshold devices 5 and 6 are connected in parallel with the relay. The operation of the device is carried out similarly to the operation in monitoring the actuation and release currents.

Subject invention

A device for monitoring the parameters of electromagnetic relays and electromagnets, comprising a pulse generator, a resistor, a differentiating circuit, pulse shapers and logic elements "AND, distinguished by the fact that, in order to provide automatic control of parameters and increase reliability, it is equipped with a control mode switch two threshold devices that are connected in parallel to the resistor, and the outputs of the threshold devices are connected to the inputs of logical elements “I.