RU2211471C2 - Unit for control, signaling and protection of compressor re- fueling module - Google Patents

Abstract

FIELD: control and regulation systems of general assignment, control means of compressor gas-filling plant. SUBSTANCE: control unit has central processor, module of analog-to-digital converter, modules of discrete input and output and indication panel incorporating light-emitting diodes, four-position seven-segment light-emitting diode indicator and operating time counter connected to outputs of modules of discrete output. EFFECT: provision for integration of functions of control, protection, signaling and gas supply with utilization of potential for information processing by processor module. 2 cl, 3 dwg, 1 tbl

Description

Technical field
The invention relates to control and regulatory systems for general purposes, and in particular to means and control systems of a compressor gas station (station).

State of the art
Known devices for the protection and signaling of automobile gas-filling compressor stations (CNG filling stations) (for example, CNG filling stations BK-40 E-MK VK, designed for refueling from gas pipelines) that carry out signaling and emergency shutdown of CNG filling stations in case of emergency. The disadvantage of these technical solutions is the lack of automatic control of functioning.

 Closest to the claimed technical solution (prototype) is the Control Panel of the CUBOGAS-S natural gas filling station (CUBOGAS NATURAL GAS REFUELLING STATION) installed in a safe area and equipped with an automatic control section with the Start, Stop buttons of the compressor and emergency alarm buttons and power section.

 The disadvantage of this technical solution is its small functionality, because The functions of accounting for gas consumption, cost and payment of supplied gas are performed by a centralized control system. The management, protection and alarm functions and the financial and settlement functions are separated. Therefore, the total cost of equipment to obtain the required control parameters is significant.

 The inventive device proposes to combine the functions of control, protection and signaling and gas release when using the information processing capabilities of the processor module and detailing the output of information on the display panel on the status of technical equipment in emergency situations using a multi-purpose four-digit LED indicator.

SUMMARY OF THE INVENTION
The known device contains a programmable controller consisting of a central processor module with flash memory and connected to the VME system bus module of the analog-to-digital converter input ADC, discrete input module ENTER = 24, the first and second discrete output modules OUTPUT = 24/1, discrete module OUTPUT = 24/2, discrete output module OUTPUT ~ 220/2, to the inputs and outputs of which sensors and actuators are connected, as well as a heat stabilizer that provides the required climatic conditions for the unit to operate, the fault contacts of which are connected to the input of the discrete input module INPUT = 24.

 The aim of this invention is to expand the functionality and increase the reliability and efficiency of operation.

 To obtain this technical result, a display panel and an operating time counter connected to the outputs of the first and second discrete output modules OUTPUT = 24/1 and the discrete output module OUTPUT = 24/2 of the controller are additionally introduced into the known device.

 The display panel contains a four-digit seven-segment LED indicator, the control inputs of the two least significant bits through resistors are connected to the outputs of the first discrete output module OUTPUT = 24/1, the control inputs of the two highest bits through resistors are connected to the outputs of the second discrete output module OUTPUT = 24/1, LEDs, LED anodes “DISCHARGE PRESSURE> 5 MPa", "SUCTION PRESSURE <2 MPa", "INCREASED RESISTANCE AT THE INPUT", "COMPRESSOR MALFUNCTION", "FIRE", "GAS LEAKAGE" through the resistors are connected to the outputs of my For the discrete output, “OUTPUT = 24/2”, and the cathodes are combined and connected to a power source, the cathodes of the LEDs “THERMOSTAT ON”, “AUTOMATIC ON”, “FAULT THERMOSTAT” are connected to the outputs of the temperature stabilizer sensors, and the anodes are connected to the voltage source , operating hours counter, the contacts of which are connected respectively to one of the outputs of the discrete output module OUTPUT = 24/2 and the supply voltage source.

 The sensor “Input pressure to the module” DD1, the sensor “Pressure at the inlet to the compressor” DD2, the sensor “Discharge pressure of the first stage” DD3, the sensor “The discharge pressure of the second stage” DD4, the sensor is connected to the inputs of the analog-to-digital converter module of the ADC controller input; "Pressure at the exit from the module" ДД5, sensor "Temperature at the exit from the module" ДТ1. The fire detector contacts, normally open contacts of the "Start" and "Stop" buttons, normally open contacts "Setpoint 1" and "Setpoint 2" and the outputs "О В" and "24 V" of the gas analyzer are connected to the inputs of the discrete input module ENTER = 24; normally closed contacts of the "Emergency" button and normally open contacts of the "Select" and "Change" buttons, solenoid valve actuators "Valve (bypass)" and "Valve (output)" are connected to the outputs of the digital output module OUTPUT = 24/2, discrete output module OUTPUT ~ 220/2 connected indicators with lamps on “Refueling”, “Alarm”, “Siren Alarm” electric siren terminals and coil contacts of the second magnetic starter. The first conclusions of the three main contacts of the second magnetic starter are powered from the second three-phase circuit breaker, and the second conclusions are connected to the input terminals of the electric drive of the MKZ compressor. The auxiliary normally open contact of the second magnetic starter is connected to the input of the discrete input module INPUT = 24. The output terminals of the second circuit breaker are connected to the three-phase AC network, one of the phases of the three-phase power supply after the second circuit breaker through the normally closed contact of the "Off" button connected to the first contact of the group of normally open contacts of the first magnetic starter and through the normally open contacts of the "On" button to the winding of the first magnetic starter, and the second contact of the group of normally open contacts and the terminals of the coil of the first magnetic starter are connected to the contacts of the thermostabilizer.

List of drawings
In FIG. 1 shows the structural diagram of the control unit, protection and alarm.

 Figure 2 shows the circuit diagram of the display panel.

 In FIG. Figure 3 shows the wiring diagram for the control, protection and alarm unit as part of the compressor refueling module.

An example embodiment of the invention
The control, protection and signaling unit (BUZS) 1 (Fig. 1) contains a programmable controller 2, consisting of a central processor module 3 and connected to the VME system bus module of the analog-to-digital converter INPUT AC 4, discrete input module INPUT = 24 5, the first 6 and second 7 discrete output modules OUTPUT = 24/1, discrete output modules OUTPUT = 24/2 8, discrete output modules OUTPUT ~ 220/2 9, BT 10 thermal stabilizer and display panel 11 with a running time counter 12 installed on it, four-digit seven segment LED indicator Ator 13 and LEDs "THERMOSTAT ON." 14, "AUTOMATION ON." 15, "PRESSURE PRESSURE> 5 MPa" 16, "SUCTION PRESSURE <2 MPa" 17, "INCREASED RESISTANCE INPUT" 18, "COMPRESSOR MALFUNCTION" 19, "FIRE" 20, "GAS LEAKAGE" 21, "THERMAL MALFUNCTION 22" as well as the RS-232-C interface for connecting an external personal computer 23 and input-output circuits 24 for connecting sensors and actuators.

 The display panel 11 (figure 2) contains an indicator 13, LEDs 14-22, first, second and third resistors 25, 26, 27. Figure 3 further indicates the following sensors and actuators located in the compressor compressor module (MKZ) 28 and connected to the control, protection and alarm unit 1: “Fire sensor” 29, “Stop” 30 and “Start” buttons 31, gas analyzer sensor 32, “Inlet pressure to the module” 33 sensors, “Inlet pressure to the compressor” 34 , "Discharge pressure of the first stage" 35, "Discharge pressure of the second stage" 36, "Pressure at the outlet of the module" 37, "Temper atura at the exit of module "38, valves" Valve (output) "39," Valve (bypass) "40, indicators" Refueling "41," Alarm "42, siren" Sound alarm "43, buttons" Alarm "44," Selection "45," Change "46, first magnetic starter 47, first circuit breaker 48, second magnetic starter 49, second circuit breaker 50.

 BUZS is designed for automatic control, alarm and protection of the compressor compressor module (MKZ) 28.

BUZS provides:
- automatic control of the magnetic starter for supplying and removing the supply voltage to the BUZS, the magnetic starter for starting and stopping the compressor, the bypass solenoid valve, the output solenoid valve, sound and light (emergency, fueling) alarms;
- automatic start and stop of the compressor according to the program;
- receiving information from sensors of controlled parameters (pressure, temperature, gas analyzer, fire detector), providing automatic alarm and compressor protection when controlled parameters go beyond acceptable limits;
- operational calculation of the amount of gas charged;
- operational diagnostics of the MKZ compressor operation, based on the operational calculation and performance monitoring;
- information on the volume of gas cylinders and the accident code when emergency and pre-emergency situations are detected on the display panel.

Main technical characteristics of BUZS:
- the number of discrete input channels with level = 24 V - 12;
- the number of analog input channels 4-20 mA - 6;
- the number of discrete output channels = 24 V - 41.

The composition of the BUZS 1 includes the following main devices and assemblies:
- controller 2, which includes the central process module 3, the analog-to-digital converter module ACC input 4, the digital input module ENTER = 24 5, two digital output modules OUTPUT = 24/1 6, 7, the digital output module OUTPUT = 24/2 8 and discrete output module OUTPUT ~ 220/2 9;
- thermal stabilizer 10;
- display panel 11;
- running hours counter 12.

 Controller 2 is the top link of the control of the CCD and is designed to collect data, process them, control the operation and diagnostics of the CEC equipment and automation components of the MKZ, as well as to provide communication on interface 23 with a remote PC.

 Controller 2 implements programmed protection and alarm control and provides for emergency shutdown and compressor protection.

Thermostabilizer 10 is designed to maintain the temperature inside the BUZS in the range from plus 5 to plus 55 ^o C at an ambient temperature of minus 40 to plus 40 ^o C and terminate the operation of the BUZS in case of violation of the temperature regime inside the unit.

Indication panel 11 is designed to visually control the running time of the compressor, the volume of gas cylinders, decrypt the operating, pre-emergency and emergency conditions of the system by illuminating a specific LED, displaying the gas volume charged, and also displaying the error number on a four-digit LED indicator 13, namely:
- LED 14 "THERMOSTAT ON." - indicates that the heating element of the thermostabilizer 10 is turned on and the heating unit is warming up;
- LED 15 "AUTOMATIC ON." - signals that the primary power supply from the thermostabilizer 10 to the submodules of the secondary power supply is supplied;
- LED 16 "PRESSURE PRESSURE> 5 MPa" - indicates that the command to start the compressor is prohibited, since the discharge pressure is more than 5 MPa;
- LED 17 "SUCTION PRESSURE <2 MPa" - indicates a decrease in pressure at the inlet to the compressor less than 2 MPa;
- LED 18 "ENHANCED INPUT RESISTANCE" - signals the excess of the pressure difference at the inlet to the MKZ and at the inlet to the compressor by more than 0.5-3 kgf / cm ² ;
- LED 19 "COMPRESSOR MALFUNCTION" - indicates that the compressor capacity is less than the set one and (or) the discharge pressure of the first stage of the compressor is greater than the discharge pressure of the second stage, at the same time, the discharge pressure of the second stage exceeds the pressure at the compressor inlet;
- LED 20 "FIRE" - signals the fire detector;
- LED 21 "GAS LEAKAGE" - signals the operation of the gas analyzer;
- LED 22 "THERMOSTAT MALFUNCTION" - signals the temperature inside the CWS and (or) the heating element of the thermostabilizer 10 exceeding the limits of permissible values.

 The error code and the interpretation of its value when outputting to a four-digit LED indicator 13 are shown in the table.

 The operating time counter 12 is designed to record the operating time of the compressor.

 The control unit, protection and alarm operates as follows (brief algorithm of work).

BUZS can be in the following states:
- switched off;
- power is on, warming up, automation is off;
- operating mode, automation is on;
- thermostat failure, automation turned off;
- overheating of the unit, the automation is turned off.

The transition between the states "AUTOMATIC OFF" - "AUTOMATIC ON" occurs automatically upon a signal from the thermostat that the operating temperature has been reached. The unit is turned on when the operating temperature reaches +5 ^o C, and the shutdown occurs when it overheats above +50 ^o C or when the temperature drops below +2 ^o C.

 After reaching the operating mode, power is supplied to the BUZS controller, sensors and other circuit elements.

Automation BUZS can work in the following modes:
- testing;
- stop;
- work (gas station);
- normal shutdown;
- Emergency Stop.

 The "TEST" mode occurs after turning on the power of the automation. 10-15 seconds after switching on, the BUZS emits a short sound signal and all display elements are illuminated, except for “MALFUNCTION OF THE THERMOSTAT” 22. To end the test mode, press the Stop button 30. The display elements also automatically turn off after 10 minutes, even if the button has not been pressed.

 The STOP mode occurs after the completion of the STOP command, that is, after the TEST mode. In this case, the compressor motor is turned off, both valves (output 39 and bypass 40) are closed. In this mode, the tank refueling volume should be set.

 The “OPERATION” mode starts when you press the “Start” button 31, if there are no conditions that prevent refueling.

 Refueling is carried out in the following sequence. After pressing the “Start” button (shortly) 31, an audible signal is generated by the siren 43. The value of the set gas volume is read. The value of the pressure at the output of the MKZ is checked. If the output pressure is small (<0.2 MPa), then the error "E534" - "SMALL PRESSURE ON THE DEVICE OUTPUT" is generated. If you need to refuel vehicles with a low residual pressure, press and hold the "Start" button 31 for the duration of the sound signal (5-7 s).

The discharge pressure is checked. In the event that it is> 5 MPa, and the pressure at the output of the MKZ is significantly less, then discharge pressure is transported into the transport. (The indicator “PRESSURE PRESSURE> 5 MPa" 16 in this case is lit in intermittent mode.) For this, the outlet valve 39 is opened. If, after the pressure has been relieved (equalized), it is lower than 5 MPa, the compressor is allowed to start, otherwise the error "E538" is generated - "ATTEMPT TO START AT PRESSURE OF PRESSURE> 50 KGS / SM ² ".

 If the discharge pressure is> 5 MPa, and the value of the outlet pressure does not allow it to be relieved, then the compressor starts up. The indicator "PRESSURE PRESSURE> 5 MPa" 16 lights up continuously.

 When compressor charge is enabled, bypass valve 40 opens. Then the compressor starts. After holding (5-10 s), charging starts to accelerate the compressor. The “Refueling” indicator 41 lights up, the bypass valve 40 closes, and then after 1-2 seconds the output valve 39 opens (if it was not opened earlier with direct refueling).

 With compressor and direct charging, 3-5 seconds after the start of the process, the value of the outlet pressure and temperature is stored, which immediately calculates the initial gas volume in the refueling tank.

 In the process of refueling, periodic calculation and display of the volume of gas charged is carried out, and on the basis of it, the compressor capacity is determined. If the capacity is lower than the minimum capacity setting (25 l / min), the warning indicator "COMPRESSOR MALFUNCTION" 19 lights up.

 During the filling process, the permissible discharge pressure is also continuously determined based on the allowed differential on the compressor and the suction pressure. In the event that the calculated output pressure is lower than the nominal charge pressure (20 MPa), the indicator "SUCTION PRESSURE <2 MPa" 17 operates in intermittent mode. If the calculated pressure is lower than the achieved discharge pressure, an alarm signal is generated with the code "E520" - "SUCTION PRESSURE 12.5 TIMES LESS OUTPUT".

 After the pressure at the output reaches the set point for the charge pressure, the "NORMAL STOP" command is automatically generated. After closing the outlet valve 39, with a delay of 2-3 s, the final pressure and temperature in the tank are determined, and the gas volume charged is calculated from them.

During the refueling process, the pressure difference between the inlet of the CCD and the compressor inlet is continuously monitored. If the pressure drop across the filter reaches 1.5 kgf / cm ² , a warning is generated, and the “INCREASED RESISTANCE INPUT” indicator 18 is in intermittent mode. If the pressure drop is> 3 kgf / cm ² , the indicator light is continuous.

 Also, the temperature and pressure at the outlet of the MKZ are continuously monitored during refueling. If the temperature exceeds the upper threshold ("E536") or the lower ("E537") or the output pressure exceeds the emergency stop setting ("E521"), a corresponding alarm is generated.

 Similarly, when the compressor is running, the maximum inlet suction pressure is also monitored (error "E535").

 The calculated value of the charged volume is held on the BUZS indicator until the beginning of a new filling or setting of another initial volume.

 When the compressor is on discharge, the ratio of the pressure of the I and II stages is also monitored. If the discharge pressure of the first stage exceeds the discharge pressure of the second stage, and the discharge pressure of the second stage is higher than the suction pressure, the alarm "E527" is generated and the indicator "COMPRESSOR FAULT" 19 is turned on.

The normal stop of the MKZ is carried out in three cases:
- when the operator presses the Stop button 30;
- upon receipt of the remote command "STOP" (from a remote PC);
- automatically, upon reaching the refueling pressure setting (20 MPa or less).

 In the latter case, a short beep sounds to alert the operator. The stop process is performed in the following sequence.

 The outlet valve 39 closes. Then, after 1-2 seconds, the bypass valve 40 opens. After 10 seconds (to run the compressor), its power is turned off. The Refueling indicator 41 turns off. It will then light in intermittent mode if the output pressure is close to the refueling set point (20 MPa).

 10 s after turning off the compressor, bypass valve 40 closes.

 After a normal stop, the MKZ switches to the STOP state.

Emergency stop is performed in two cases:
- when you click the "Emergency"44;
- in the event of an accident as determined by the CCD.

 In the event of an emergency stop, light (“Alarm” indicator 42) and continuous audible (siren “Audible Alarm” 43) signals are issued. The equipment shutdown is performed similarly to a normal stop, only the compressor shuts down immediately.

 When an emergency stop occurs, the BUZS indicator displays an emergency code, such as "E ...". (Decoding of codes is given in the table above).

 To unlock (reset) the accident, you must press the "Stop" button 30. In the event that the causes of the accident are not eliminated, the emergency stop occurs again. Upon normal termination, the device will enter the STOP state.

 When the automation is switched on, the following signals from MKZ sensors are continuously monitored.

 Upon receipt of a signal from the "Setpoint 2" of the gas analyzer, an "E523" alarm is generated with the "GAS LEAKAGE" 21 indicator on in continuous mode.

 When a signal arrives from the “Setpoint 1” of the gas analyzer, a “GAS LEAKAGE” warning is generated 21. The GAS LEAKAGE indicator is operating in intermittent mode.

 When a signal is received from the fire sensor 29, an "E524" alarm is generated with the "FIRE" indicator 20 on.

 The compressor compressor module operates as follows (brief operation algorithm).

 Open the front panel of the MKZ housing.

Submit external power to the MKZ. At the same time, the signals “THERMOSTAT ON.” Should appear on the BUZS panel 14 and "AUTOMATIC ON." 15. The second signal during the cold period of operation (when the CCD is cooled to +5 ^o C and below) appears with a delay of up to 30 minutes (depending on the time the device was warmed up).

 15-20 s after the “AUTO ON” signal appears 15 when the program starts normally, a short sound signal is emitted and all the indicators of the BUZS panel are illuminated (except for the signal "THERMOSTAT MALFUNCTION" 22) and the indicators "Alarm" 42 and "Refueling" 41 on the MKZ.

 The operator must check the glow of all indicators and, if successful, press the "Stop" button 30 on the MKZ. If there is no glow of any indicator, the operation of the CCD is prohibited until the fault is fixed.

 If for some reason the operator does not press the Stop button 30, unnecessary indicators will automatically turn off after 10 minutes. In this case, the resumption of the BUZS is also possible after pressing the "Stop" button 30.

 For refueling vehicles, the operator must connect the cars, check the tightness of the joint and the presence of residual pressure in the tanks of technical equipment, and also determine the total capacity (in liters) of the refueling tanks.

 The total capacity in liters is entered into the BUZS using the buttons on the MKZ “Choice” 45 and “Change” 46.

 When the “Select” button 45 is pressed, the indicator bits are highlighted one by one (the selected category starts flashing). The “Change” button 46 changes the value (0. ..9, 0, etc.). After completing the input, after 10-15 seconds, the blinking of the discharge automatically stops.

 Refueling of vehicles begins when you press the "Start" button 31. At the same time, a short-term sound signal of readiness is given.

 In the event that, for some reason, the residual pressure in the vehicle is close to zero (less than 0.2 MPa), to start refueling, press and hold the "Start" button 31 until the end of the sound signal that turns on when refueling (6-10 s ) With the usual (short-term) pressing of the “Start” button 31 in such a situation the “E534” alarm will be detected - “SMALL RESIDUAL EXIT PRESSURE”.

The refueling process can be stopped automatically in three cases:
- upon reaching the output voltage setting in the tanks (20 MPa);
- in the event of an emergency detected by the security system BUZS;
- in case of power failure, including short-term.

 When the compressor is idle, voltage drops of up to 1 s are permissible, and during discharge operation, up to 0.1 s. The voltage dip is determined by the release of the contactors MKZ.

 When refueling is completed due to the achievement of the nominal pressure after turning off the MKZ equipment, a short-term sound signal is issued to alert the operator. In the event of an accident, the “Sound Alarm” siren 43 and the “Alarm” light 42 are issued continuously until the operator releases the alarm. In case of power interruptions, the standard module switching procedure is carried out.

 During the refueling process, the “Refueling” signal 41 is continuously lit. Upon completion, when the pressure in the refueling vehicle is equal to the nominal set point (20 MPa), the indicator lights up in intermittent mode.

During refueling and upon its completion, the current value of the calculated refueling volume in “normal” liters is displayed on the BUZS indicator in a “running” line. For example, the value "1.23 nm ³ " will be displayed as "1_230".

 The operator can stop the manual refueling process at any time by pressing the Stop 30 or Alarm 44 buttons, depending on the situation.

 Also, the "STOP" command can be transmitted by an operator from a remote PC when such a need arises.

 When an automatically detected emergency occurs, as well as when you press the "Emergency" 44 button, an emergency shutdown of the equipment occurs with the sound and light signal "Emergency". In this case, the alarm code "E ..." is displayed on the BUZS indicator. Also, part of emergency situations is deciphered by light indicators on the BUZS panel with explanatory inscriptions. To unlock the accident, you must press the "Stop" button 30. If the emergency situation is not resolved, the protection will re-operate.

 When threatening situations are detected, the BUZS gives a warning signal to the lamp "Emergency" 42 in intermittent mode without a sound signal. Decryption of the reason for the warning is carried out by indicators on the BUZS panel. Operation (continued refueling) of the MKZ in the presence of warnings should be carried out under the continuous supervision of the operator, under his responsibility. Upon completion, it is necessary to take measures to eliminate the cause of the threatening situation.

 In the event of the warning “SUCTION PRESSURE <2 MPa" 17 (before or during filling), the filling will be carried out not to the maximum setting of 20 MPa, but to a value determined by the inlet pressure and allowable differential on the compressor (approximately 12.5 * value suction pressure).

 If the warning "PRESSURE PRESSURE> 5 MPa" 16 occurs, it is not possible to start the compressor without relieving the discharge pressure. Nevertheless, if the warning indicator is operating in intermittent mode, this means that it is possible to relieve pressure in the refueling vehicle. In this case, the Start button 31 opens the output of the MKZ (without starting the compressor). If after bleeding off the pressure it drops below the limit allowed for starting, the MKZ compressor will automatically turn on and refueling will continue. Otherwise, shutdown will occur.

 To increase the life of the CCD during prolonged breaks in operation (more than 1-2 hours), it is recommended to disconnect the MCZ from the mains.

 Setting the parameters of natural gas (gas constant, critical pressure, temperature), as well as the volume of refueling transport is possible with a remote PC. The set gas parameters are stored until the power off of the CCD. When you turn on the power, they are set to the original value.

Industrial applicability
The proposed device has wider control capabilities, increased reliability due to detailing the causes of emergencies and greater operational efficiency, as well as continuous diagnostics of the compressor based on the operational calculation of performance.

Claims (3)

 1. The control unit, protection and alarm of the compressor compressor module, comprising a programmable controller consisting of a central processor module with flash memory with a VME system bus, as well as sensors and actuators, characterized in that the unit also contains an analog-to-digital converter input module (4), a thermostabilizer designed to provide the required climatic conditions for the operation of the unit, the contacts of the temperature sensor of which are connected to the inputs of the input module of an analog-to-digital converter caller (4), and thermostat fault contacts to the input of the discrete input module (5), discrete output modules (6), (7), (8) and (9), the operating time counter and the display panel containing light-emitting diodes, four-digit seven-segment LED indicator, the outputs of the first discrete output module (6) are used to connect to one input of the LED indicator, and the outputs of the second discrete output module (7) are designed to connect to other inputs of the LED indicator, the outputs of one of the discrete output modules (8) are intended nacheny for connection to the LEDs, and one output intended for connecting operating time meter, the sensors and actuators are connected to the inputs and outputs of the digital input module, the module input analog-to-digital converter and the digital output modules, connected to a VME bus system.  2. The block according to claim 1, characterized in that the display panel contains a four-digit seven-segment LED indicator, the control inputs of the two least significant bits through the resistors are connected to the outputs of the first discrete output module (6), the control inputs of the two highest bits through the resistors are connected to the outputs of the second module discrete output (7), LEDs, anodes of LEDs “DISCHARGE PRESSURE> 5 MPa", "SUCTION PRESSURE <2 MPa", "INCREASED RESISTANCE IN THE INPUT", "COMPRESSOR MALFUNCTION", "FIRE", "GAS LEAK" through resistors under are connected to the outputs of one discrete output module (8), and the cathodes are combined and connected to a power source, the cathodes of the LEDs "THERMOSTAT ON", "AUTOMATIC ON", "MALFUNCTION OF THE THERMOSTAT" are connected to the outputs of the temperature stabilizer sensors, and the anodes are connected to the voltage source, operating hours counter, the contacts of which are connected respectively to one of the outputs of one discrete output module (8) and to the supply voltage source.  3. The unit according to claim 1, characterized in that the sensor “Pressure at the input to the module”, the sensor “Pressure at the entrance to the compressor”, the sensor “Pressure at the discharge of the first stage” are connected to the inputs of the input module of the analog-to-digital converter (4) of the controller , sensor "Discharge pressure of the II stage", sensor "Pressure at the exit from the module", sensor "Temperature at the exit from the module", fire detector contacts are connected to the inputs of the discrete input module (5), normally open contacts of the "Start" and "Stop" buttons ", normally open contacts" Setpoint 1 "and" Setpoint 2 "and outputs" O In "and" 24 V "of the gas analyzer, normally closed contacts of the" Emergency "button and normally open contacts of the" Select "and" Change "buttons, electromagnetic valve actuators" Valve (bypass) "and" are connected to the outputs of one discrete output module (8) Valve (output) ", to the outputs of another discrete output module (9) are connected indicators with incandescent lamps" Refueling "," Alarm ", the terminals of the electric siren" Sound alarm "and the contacts of the coil of the second magnetic starter, the first conclusions of the three main contacts of the second magnetic starterare powered from the second three-phase circuit breaker, and the second conclusions are connected to the input terminals of the compressor electric drive, the auxiliary normally open contact of the second magnetic starter is connected to the input of the discrete input module (5), the output terminals of the second circuit breaker are connected to a three-phase AC network, one of the phases three-phase power supply after the second circuit breaker through a normally closed contact button "Off. "connected to the first contact of the group of normally open contacts of the first magnetic starter and through the normally open contacts of the button" On "to the winding of the first magnetic starter, and the second contact of the group of normally open contacts and the terminals of the coil of the first magnetic starter are connected to the contacts of the heat stabilizer.

Images