SU1418103A1 - Arrangement for emergency disconnection of electric locomotive power supply - Google Patents

Abstract

The invention relates to automation of transport operations and is intended for use on remote-controlled electric locomotives. The device for emergency shutdown of the power of an electric locomotive contains - logical elements HE 3 and 2-HE 8, between the cable of the first of which and one of the inputs of the latter include a circuit of series-connected resistors 6 and 5, the last of which is shunted by a diode 4, an executive relay, the coil 9 of which is shunted by a diode 10 and connected to the positive output of the power source and the output of a logic element 2I-HE 8, which is connected to one of the inputs one of the outputs of the capacitor 7, and a signal relay, the coil 2 of which is connected by one of the outputs to a plus of the power supply source. 1 nl

Description

To the dual load current sensor

To binary Uatchik

00 Oh

WITH

The invention relates to the automation of transport operations in the process of underground mining of mines intended for use in remote contact and battery locomotives.

The purpose of the invention is to increase traffic safety.

The drawing shows a schematic diagram of the device for emergency power off of the locomotive.

The device contains a branch from the series-connected contact 1 of the control contactor and the coil 2 of the signal relay connected to the positive output of the power supply to the control circuits, an HE 3 logic element, whose input is intended to be connected to a binary sensor (not shown) with control signals and the output connected to the cathode of diode 4 and to one of the terminals of the resistor 5.. The diode 4 of the diode and the other terminal of the resistor 5 are interconnected and a resistor 6 is connected in series with them, the other terminal of which is connected to one of the terminals the capacitor 7 and one of the inputs of the logic element 2И-НЕ 8. The other output of the capacitor 7 is connected to the minus terminal of the power supply of the control circuits, and the other input of the logic element 2IHE 8 is intended to be connected to a binary sensor (not shown) engine load. The output of the logic element 2I-NOT 8 is connected to one of the terminals of the coil 9 of the executive relay, shunted by the diode 10. Another output of the coil 9 of the executive relay and the cathode of the diode 10 are connected to. the positive output of the control power supply source,

The device works in the following way.

If there is no control signal from the binary sensor for the presence of control signals at the input of the receiver (not shown), a logical zero signal is fed to the input of the logical element 3, to which the logical unit corresponds to the output of this logic element. Capacitor 7 is charged to the level of a logical unit. At the other input of the logic element 2И-НЕ 8, in the absence of a load current, the logic zero level is set.

2 2 25

40

five

0

five

what is the logical unit at the output of this logic element, and the coil 9 of the executive relay is de-energized. When control signals appear at the receiver input of the control signals, a logical unit is formed at the output of the binary sensor for the presence of control signals, and a logic zero level is output at the output of the logic element HE 3, and through a resistor 6 the resistance of which is significantly less than the resistance of the resistor 5, and diode 4, capacitor 7 is quickly discharged to the level of logic zero, setting the same level at one of the inputs of the 2Y-NOT 8 logic element. From the {moment when the binary load current sensor of the traction motor The gate switches to a single state, signaling the presence of a load current in a traction motor, a single level is held at another input of logic element 2ID-HE 8. When the control signal from the output of the binary sensor disappears, the control signals go to the input of the HE 3 logic element logical zero, and the output of this logic element is NOT 3 sets the level of the logical unit, and through the resistors 5 and 6, the capacitor 7 begins to charge - to the level of the logical unit, counting the delay time In the meantime, the power contactor is disconnected and the current in the traction motor circuit drops. If current

in the traction motor circuit, it decreases to zero during the charging time of the capacitor 7, the executive relay does not operate. If for any reason (for example, welding the contacts) the current in the traction motor circuit does not decrease to the switching value of the binary sensor for the presence of current in the traction motor circuit from one to zero, after a time delay due to the circuit parameters from the capacitor 7 and resistors 5 and 6, at one of the inputs of the logic element 2I-NOT 8, the level of the logical unit is set, the same level is maintained at the other input of this logic element. As a result, a logic zero level is set at the output of logic element 2I-HE 8, the executive relay is activated and the contact of this relay (not shown) closes the power supply disconnect circuit.

Claims (1)

Claims of the Invention A device for emergency power off of an electric locomotive comprising a circuit connected to a power source from the control contactor and the signal relay coil connected in series, semiconductor valves, and an executive relay. one of the outputs of the coil of which is connected to one of the terminals of the power source, and the capacitor, is in fact that, in order to increase the safety of the movement, it is equipped with logical elements mi NOT and 2I-NOT and resistors, one of the terminals of which are interconnected, while others are connected to the output of the logical element NOT and to one of the inputs of the logic element 2I-NOT to which another terminal of the power source is connected to a capacitor, one of the resistors and another output terminal connected to the output of the logic element 2I-NOT is shunted by the corresponding semiconductor valves, and the input of the logic element NOT and the other input of the logic element 2I-NOT are intended to connect the sensor outputs s presence, respectively, the control signals and the load current.