RU217203U1 - DEVICE FOR CHECKING MEASURING CONVERTERS OF NORMALIZING - Google Patents

Abstract

The utility model relates to designs used in the field of automatic control systems for technological processes, in particular, to identify the causes of failure of analog signal input circuits. The objective of the utility model is to optimize the process of assessing the health of the PSI modules. EFFECT: reduction of troubleshooting time in analog input circuits of "KVANT-R" automatic control systems. The problem is solved, and the technical result is achieved by creating a universal device for testing the operability of the PSI modules, consisting of a case, on the panel of which there are: a button to turn on the device, a block for connecting and fixing the PSI module under test, regulators for simulating the input analog signals of the PSI within the ranges their measurements, a digital display for monitoring the voltage of the output signal of the PTS in the range from 0 to 10 V, a switch for selecting the type of the tested PTS and a unified DC005 connector for connecting an external power source with a constant voltage of 24 V. 3 ill.

Description

The utility model relates to designs used in the field of automatic process control systems (hereinafter referred to as ACS), in particular, to identify the causes of failure of the ACS analog signal input circuits.

VSUR.426438.003 16-channel analog signal input terminal panels VSUR.426438.003, which are printed the board on which the terminals for connecting input signals are located, replaceable modules of normalizing measuring transducers (hereinafter referred to as PTS), the type of which depends on the parameters of the input signal, which converts the input analog signal from external sensors into a unified signal with a voltage of 0-10 V. The terminal panel diagram is shown in Fig. 1.

In total, three types of PPI are used:

VSUR.426442.001-01 for converting analog signals of thermal resistances in the range of 74…208 Ohm;

VSUR.426442.001-06 for converting analog thermocouple signals in the range of -3.554…+54.138 mV;

VSUR.426442.001-07 for converting analog unified current signal in the range of 0…20 mA.

Further, the converted unified output signal with a voltage of 0-10 V is supplied to the mezzanine modules, which perform analog-to-digital conversion of these signals and transfer them to the computing module of the controller for processing and transmission to the upper level of the ACS.

During the operation of the ACS "KVANT-R" cases of failure of the PSI modules are not ruled out, which is perceived by the control system as the absence or unreliability of the signal coming from one of the analog sensors. In this situation, there is a problem of prompt detection and elimination of this malfunction, since there is no universal device for testing the above PSI modules, due to the variety of their design and types of converted analog signals (resistance, voltage, current).

The existing method for testing the performance of PSI modules with factory-made devices [Laboratory IP AKTAKOM APS-1721, electronic resource, URL: https://www.aktakom.ru/kio/index.php?SECTION_ ID=2096&ELEMENT_ID=11289402 (date of access: 29.08. 2022)], [Fluke-175 digital multimeter, electronic resource, URL: https://kipia.ru/catalog/izmeritelnye-pribory/elelrtroizmeritelnye 175-177, (Accessed: 29.08.2022)] and [Fluke 754 multifunctional calibrator , electronic resource, URL: https://flukeshop.m/kalibrator-mnogofunkcionalnyj-fluke-754, (Accessed 08/29/2022)] is shown in Fig. 2. It is performed in the following sequence: depending on the type and range of the converted analog signal indicated on the case of the IPN 1, a voltage value of 24 V is set on the laboratory power supply 2, then this voltage is applied to terminals 3 and 5 (Fig. 1) of the subject PSI 1 module with respect to polarity. Using a multimeter 3 in the mode of a voltmeter connected to terminals 4 and 5 of the module (Fig. 1), the level of a unified signal with a voltage of 0-10 V at the output of the module is controlled. The calibrator 4 is connected to terminals 0-2 (Fig. 1) of the IPN 1 according to the scheme, depending on the type of input signal. Next, the calibrator 4 sets the parameters of the input signals depending on the type of the tested module PSI 1 in the entire operating range. If, as a result of measurements, the beginning of each range corresponds to a voltage of 0 V of the output signal, and its end to a voltage of 10 V, and at the same time this signal changes linearly proportionally with a change in the input signal, the PPN 1 module under test is considered serviceable.

The disadvantage of this method is its complexity, due to the need for the simultaneous use of three devices in stationary laboratory conditions and a significant number of switching switching in the process of assessing the health of the PSI modules.

The objective of the utility model is to optimize the process of assessing the health of the PSI modules.

EFFECT: reduction of troubleshooting time in circuits of input analog signals of ACS "KVANT-R".

The problem is solved, and the technical result is achieved by creating a universal device for testing the operability of the PSI modules, consisting of a case, on the panel of which there are: a button to turn on the device, a block for connecting and fixing the PSI module under test, regulators for simulating the input analog signals of the PSI within the ranges their measurements, a digital display for monitoring the voltage of the output signal of the PTS in the range from 0 to 10 V, a switch for selecting the type of PTS being tested and a unified DC005 connector for connecting an external power source with a constant voltage of 24 V.

The electrical circuit diagram of the device for testing the modules of the IPN 1 is shown in Fig. 3. In the case 5 of the device are mounted: a button 6 for turning on the power of the device, a unified DC005 connector 7 for connecting an external power source with a constant voltage of 24 V, a printed circuit board 8 with an ATmega8 microcontroller 9 placed on it and a three-digit seven-segment LED indicator 10, intended for measurement and indication of the voltage output signal of the PSI module in the range of 0-10 V, three variable resistors 11, 12 and 13 for changing the parameters of analog input signals corresponding to each type of PSI module 1 in the following ranges:

Electrical resistance in the range of 74 ... 208 Ohm;

Electric current in the range of 0…20 mA;

Electric voltage in the range of -3.554…+54.138 mV, three-position switch 14 for selecting the tested PPN module (VSUR.426442.001-01, VSUR.426442.001-07 or VSUR.426442.001-06), mini 360 pulse voltage converter module 15 for power supply logical circuits of the device, a linear voltage regulator 16 for powering the current generator assembled on an LM 358 17 operational amplifier, a Traco Power TMR3-2422WI 18 bipolar voltage pulse converter for generating thermocouple simulation voltages and an LM358 19 operational amplifier for matching the input resistance of the PPN 1 module with the output resistance of the Traco Power TMR3-2422WI 18 bipolar voltage converter.

To check the serviceability, the PPN 1 module is placed in the block 20 of the device and fixed in it with a screw. The device is connected to an external power source through connector 7. Switch 14 is used to select the required type of the tested module PPN 1, indicated on its case. The regulator of variable resistors 11, 12 or 13, corresponding to the required type of signal, is moved to the leftmost position, indicating the initial value of the analog input signal range. After powering up the device with button 6, check whether the beginning of the range of the analog input signal corresponds to the voltage at the output of the module 0 V, displayed on the digital display. Further, by smoothly turning the regulator of variable transistors 11, 12 or 13, they check the correspondence of the end of the range of the analog input signal to a voltage of 10 V at the output of the module. The value of the analog output signal of the PSI 1 must change in proportion to the change in the input signal over the entire operating range. The absence of the output signal of the PPN 1 module, or its non-compliance with the input signal in a linear relationship, indicates a malfunction of the tested PPN 1 module.

The external power supply of the device must provide a stable supply voltage of 24 V and a current of at least 500 mA.

Claims (1)

A device for testing normalizing measuring transducers, characterized by the fact that it consists of a housing, on the panel of which there are: a button for turning on the device, a block for connecting and fixing the PTS module under test, regulators for simulating the input analog signals of the PTS within their measurement ranges, a digital display for output signal voltage control in the range from 0 to 10 V, a switch for selecting the type of tested PPS and a unified DC005 connector for connecting an external power source with a constant voltage of 24 V.

Images