RU174938U1 - Digital Position Alarm Unit - Google Patents

Abstract

The utility model relates to mechanical engineering, in particular to position signaling units, and can be used for installation in multi-turn electric drives to convert the position of the output organ, the torque at the output organ, and the temperature of the electric motor into electrical signals. The technical result is an increase in reliability. The digital position signaling unit contains a main power supply unit, a position sensor, a torque sensor, a motor thermal protection sensor, a position current signal assembly, an RS-485 interface main channel assembly and discrete outputs unit for electromagnetic relays. In addition, a backup power node, a backup channel node of the RS-485 digital interface, and additional relays with the possibility of generating discrete local control outputs in the discrete output node have been introduced. The discrete output unit is made on bistable electromagnetic relays with an operating current of 8 A at a voltage of 220 V. 1 zp f-ly, 1 ill.

Description

The utility model relates to mechanical engineering, in particular, to position signaling units and can be used for installation in multi-turn electric drives to convert the position of the output organ, the torque at the output organ, the temperature of the electric motor into electrical signals supplied to the control device for operation of the electric drive as part of the process control system .

A known signaling unit for the position of the patent holder of OJSC “ABS ZEiM Automation” according to patent RU No. 92949, published on 10.27.2009, containing an output shaft position indicator with indication elements, a position sensor, a control device with inputs for connecting torque and temperature sensors located in the electric drive . The disadvantage of this unit is the lack of reliability due to the following characteristics: low resource of digital outputs; lack of redundancy of the digital interface for signaling the status of the drive; lack of redundancy of the power source; the impossibility of local control of the electric drive without installing an additional control panel.

The closest analogue of the claimed device, taken as a prototype, is the position signaling unit of the patent holder of OJSC ABS ZEiM Automation according to patent RU No. 109550, published 05.05.2011, containing a position sensor, a torque sensor, position and moment indication elements, controls and settings, alarm elements for end and intermediate positions, as well as excess torque signals in the form of discrete outputs of the dry contact type (electromagnetic relays), the source of the current signal is proportional the position of the output shaft of the drive with a range of 4-20 mA, and optionally a digital interface of the RS-485 standard for transmitting position and torque to the control device. The unit is powered from an AC network with a voltage of 220 V or from a DC network with a voltage of 24 V. The disadvantage of this unit is the lack of reliability due to the following characteristics: low resource of digital outputs; lack of redundancy of the digital interface for signaling the status of the drive; lack of redundancy of the power source; the impossibility of local control of the electric drive without installing an additional control panel.

The objective of the proposed utility model is to create a device that provides increased reliability during operation.

The technical result is to increase reliability.

The technical result is achieved by the fact that the inventive digital position signaling unit, comprising a main power supply unit, a position sensor, a torque sensor, a temperature sensor for electric motor protection, outputs connected to the input of the central processor unit, a current position signal unit, an RS-485 interface main channel assembly and a node for discrete outputs on electromagnetic relays, inputs connected to the output of the central processor unit, an indication and control unit exchanging information with the central unit a processor, a backup power node has been introduced, connected to the input of the central processor node by the output, a backup channel channel of the RS-485 digital interface with an input connected to the output of the central processor node, additional relays with the possibility of generating discrete local control outputs, are inserted into the digital output node by the input connected to the output CPU node. In this case, the discrete output node is made on bistable electromagnetic relays with an operating current of 8 A at a voltage of 220 V.

Improving reliability is achieved due to the fact that

bistable electromagnetic relays with higher load capacity are used in the discrete output node. Relays with an operating current of 0.5 A at a voltage of 220 V have been replaced by relays with an operating current of 8 A at a voltage of 220 V. Using bistable relays can improve the reliability of outputs (increase load capacity) without increasing the power of the power supply that would be required if monostable relays were used ;

a unit has been inserted into the unit for connecting backup power from a 24 V DC source, which allows to increase reliability during operation (if main power fails, work from a backup power source);

a redundant channel of the RS-485 standard digital interface is introduced into the unit, which makes it possible to increase operational reliability for signaling the state of the electric drive;

additional electromagnetic relays have been introduced into the discrete output node to form discrete local control outputs ("open", "close" commands) by pressing the buttons on the front panel of the unit, i.e. increased reliability during operation without installing an additional control panel.

The essence of the utility model is illustrated by a functional diagram.

The following notation is used in the diagram: 1 - the main power supply node, 2 - the backup power supply node, 3 - the display and control unit, 4 - the central processor unit, 5 - the 4-20 mA position current signal unit, 6 - the RS- interface main channel node 485, 7 - node for the backup channel of the RS-485 interface, 8 - node for discrete outputs, 9 - position sensor, 10 - torque sensor, 11 - temperature sensor for electric motor protection, 12 - bistable relays, 13 - additional relays.

The unit contains the following elements: the main power unit 1, which is an electric circuit operating from an alternating current network with a voltage of 220 V, the backup power unit 2, which is an electric circuit operating from an alternating current network with a voltage of 24 V, forming a supply voltage for all unit nodes and supplying it to the node of the central processor 4, made on the microcontroller and designed to implement the algorithm of the sensors, the signal generation algorithm for the control device, algo ITMA switching power supplies, storage and display software parameters and actuator state. The block also contains a position sensor 9, which is a multi-turn non-contact rotation angle sensor mechanically connected to the output shaft of the electric drive, a torque sensor 10, which is a non-contact rotation angle sensor, the shaft of which is mechanically connected to the electric drive shaft, the angular position of which is proportional to the output torque the shaft of the electric drive, the temperature sensor of the electric motor 11, which is the inputs for connecting a thermistor located in the electric motor igitel, the signals from which are fed to the input of the central processor unit 4. The display and control unit 3, which is a four-digit seven-segment indicator, status indicators, four control buttons and an operating mode switch located on the front panel of the unit, exchanges information with by the central processor unit 4. The block also includes nodes that process signals from the central processor unit 4 and transmit them further to the control device: current signal unit position 5, which is an electrical circuit designed to generate a current signal proportional to the position of the drive shaft with a range of 4-20 mA, the nodes of the main 6 and backup 7 channels of the RS-485 digital interface for transmitting position, moment and other diagnostic information to the control device , discrete output node 8, consisting of six bistable relays 12 with an operating current of 8 A at a voltage of 220 V, for generating signals of final and intermediate positions, as well as an excess signal to utyaschego drive shaft torque, two thin type switch 13 G6S-2-DC5 for generating local control signals.

The operation of the digital position signaling unit is based on the method of controlling the parameters of the electric drive by tracking the position of the output shaft of the electric drive using a position sensor 9, monitoring the torque on the shaft of the electric drive using a torque sensor 10, and monitoring the temperature of the motor winding using the overheating sensor of the electric motor 11.

The position signal of the output shaft of the electric drive generated by the position sensor 9, the torque signal on the output shaft of the electric drive generated by the torque sensor 10 and the overheating signal of the electric motor generated by the thermal protection sensor of the electric motor 11 are sent to the central processor unit 4, containing software that implements the functionality of the unit. The CPU unit 4, in turn, depending on the settings, transmits a signal to the display and control unit 3 to indicate the current status of the drive, a signal to the current signal node of position 5 to generate a current signal with a range of 4-20 mA proportional to the position of the drive output shaft , a signal to the nodes of the main 6 and backup 7 channels of the digital RS-485 interface for transmission to the control device, a signal to the node of discrete outputs 8 to generate the corresponding discrete signals. The indication and control unit 3, when the buttons are pressed or the operating mode is switched, generates signals arriving at the central processor unit 4, where, in accordance with the software operation algorithm, the unit settings are changed or, in case of switching to the local control mode, the signal is transmitted to the discrete units outputs 8 for the formation of local control signals. The central processor unit 4 monitors the presence of the main and backup power supply, information about this comes from the main power supply unit 1 and the backup power supply unit 2, and in the event of a main power failure, the central processor unit 4 gives a signal about switching the unit to work from the backup power source.

The digital position signaling unit allows improving operational reliability by creating a reserve of a digital interface for signaling the status of the electric drive and reserve power supply by introducing a backup power supply unit, increasing the load capacity of discrete outputs by using a bistable relay with an operating current of 8 A at a voltage of 220 V.

The inventive unit can be repeatedly played on modern equipment. The unit is planned to be used in multi-turn electric drives, which allows us to conclude that it meets the criterion of "industrial applicability" for a utility model.

Claims (2)

1. The digital position signaling unit, which contains the main power supply unit, the position sensor, the torque sensor, the motor thermal protection sensor, the outputs are connected to the input of the central processor unit, the current position signal unit, the main channel node of the RS-485 interface and the unit of discrete electromagnetic outputs relays, inputs connected to the output of the central processor unit, an indication and control unit exchanging information with the central processor unit, characterized in that the unit is introduced into the unit a redundant power supply, with an output connected to the input of the central processor unit, a backup channel node of the digital interface RS-485, an input connected to the output of the central processor unit, additional relays with the possibility of generating discrete local control outputs are introduced into the discrete output node, connected in input to the output of the central processor unit . 2. The position signaling unit according to claim 1, characterized in that the discrete output node is made on bistable electromagnetic relays with an operating current of 8 A at a voltage of 220 V.

Images