Buy Control system and protection of electric motors of ventilatory coolers
Control system and protection of electric motors of ventilatory coolers
systema_upravlenyya_y_zashchyt_elektrodvygatelej
systema_upravlenyya_y_zashchyt_elektrodvygatelej
systema_upravlenyya_y_zashchyt_elektrodvygatelej
systema_upravlenyya_y_zashchyt_elektrodvygatelej
systema_upravlenyya_y_zashchyt_elektrodvygatelej

Control system and protection of electric motors of ventilatory coolers

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Ukraine, Brovary
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16 years on Allbiz
Technical characteristics
  • BrandБРОТЕП
  • Country of manufactureUkraine
Description

Control system and protection of electric motors

ventilatory coolers

(further in the text a control system) *

* Note: in the description the general information and approach to design of control systems is provided.

 

At the request of the Customer such system can be significantly simplified.

The control system and protection of electric motors of the cooler can work without participation of the person, completely in the automatic mode.

For economy of the electric power consumed by the electric motor, the cooler can be equipped with local system of automatic control (ACS) which  provides reliability of work, excludes a human factor.

The system of automatic control provides:

·        remote control of operation of fans  of coolers

·        safe switching of the modes of fans

·        smooth  launch of electric motors

·        change  of frequency of rotation of driving  wheels

·        ensuring  complex protection of electric motors of fans

·        control of operability of power electric equipment

·        visual  control of parameters of functioning of the equipment

·        start of the modes of anti-frosting and drying of electric motors

 

The control system and protection of electric motors of coolers is developed in such a way that allows to participate in the general system of automation of the enterprise

As a rule, the system of automatic equipment of the modern industrial enterprise consists of several levels, each of which allows to operate subordinate.

At the lower level there are local push-button posts with  start-up buttons - a fan stop. Level above –  a control system of the cooler. Such complex allows to broadcast signals with information on own state on top levels and to receive "from above" instructions on change of any parameters of operation of the equipment. Thus, the operator of all production cycle, being in remote control center, can see a condition of the cooler and regulate parameters of each fan.

 The prepriyatiya is the central part of industrial control system the controller who  accepts and processes signals from sensors of a condition of the equipment and team of the operator of system.

 

On the basis of signals, according to in advance set program, the controller operates the frequency converters connected to it. Converters of frequency accelerate or slow down engines of fans. The air consumption in the cooler is so regulated. The controller transmits parameters of the equipment and signals of sensors to the top level, and also displays on the connected operator panels and screens.

Description

 The control system can be developed individually under each Customer. In this case development of individual schemes of management as a part of the general project of automation of technological processes will be required or the standard scheme is offered.

 Schemes of automation are made on the basis of experience of design, adjustment and operation of ventilatory installations of coolers at the plants metallurgical, chemical (including the petrochemical industry), power (thermal power plant, combined heat and power plant) the branches, at the plants overworking, food (the sugar plants, creameries, the juice plants, oil extraction plants, distilleries, etc.) and can be distributed to other industries.

 Automation of management processes of reverse cycles is based as the speed of the external air which is pumped over through a sprinkler of the cooler from temperature of chilled water (at the exit from the cooler), pressure on an entrance to the cooler, vibrations of ventustanovka, temperatures of the stator of electric motors, temperatures of bearings of the electric motors and other sizes characterizing technological process.

  Appointment

 The control system is necessary for increase in efficiency and quality of process of management of cooling of water by means of coolers.

 The control system provides speed control of rotation of driving wheels of ventilatory installations of coolers, depending on the taken temperature of chilled water at the exit from the cooler. The measured values of temperature which is entering (heated) and the coming-out (cooled) water, and also values of vibration of electric motors are induced on the information display.

 The control system displays key parameters: the set speed, output frequency, current and tension of the engine, output power, the moment, a condition of discrete entrances exits, the general operating time and so forth.

 The control system makes control of the feeding tension of electric motors, protects from overloads on current and tension, from a distortion or loss of a phase of a power line, from an overheat of windings and bearings of electric motors, from excess of vibration of the ventilatory max installations of value of a setting.  

Characteristic of objects of automation

The main object in the projected control system and protection is the common industrial asynchronous electric motor which sets the driving wheel of ventilatory installation of the cooler in motion. For the purpose of increase in energy efficiency of use of coolers, electric motors of ventilatory installations are operated by means of converters of frequency of Schneider Electric, ABB, Siemens,  Danfoss, Emerson, Mitsubishi Electric PCh, temperature sensors, is more rare with use of sensors of pressure, an expense, level, etc., and also by means of various program devices, cards of the PCh expansion. Also devices of smooth start-up of UPP are used. Each electric motor can work through the PCh which will operate the speed of its rotation and to monitor possible emergencies. The modes of the multiengine and a multiconfiguration are possible, using one PCh on two and more electric motors.

  For ensuring trouble-free operation of the cooler, in case of failure of the converter of frequency or during routine maintenance of PCh, power supply of electric motors is provided in a case of management through the reserve By-Pass line.

Management of operating modes of a control system and indication of working parameters is carried out by means of touch panels of operator HMI Schneider Electric, Kinco, and also the Modicon Schneider Electric controllers, logical Logo Siemens modules, etc. providing automatic control of electric drives of mechanisms of processing equipment with respect for the set functional dependences (simultaneity, a certain sequence, the set frequency of rotation of ventilatory installations, etc.).

Depending on length of the feeding lines, recommendations about installation of additional throttles on an entrance to PCh and the electric motor will be provided.

 

 Description

 

The control system can be developed individually under each Customer. In this case development of individual schemes of management as a part of the general project of automation of technological processes will be required or the standard scheme is offered.

 

Schemes of automation are made on the basis of experience of design, adjustment and operation of ventilatory installations of coolers at the plants metallurgical, chemical (including the petrochemical industry), power (thermal power plant, combined heat and power plant) the branches, at the plants overworking, food (the sugar plants, creameries, the juice plants, oil extraction plants, distilleries, etc.) and can be distributed to other industries.

 

Automation of management processes of reverse cycles is based as the speed of the external air which is pumped over through a sprinkler of the cooler from temperature of chilled water (at the exit from the cooler), pressure on an entrance to the cooler, vibrations of ventustanovka, temperatures of the stator of electric motors, temperatures of bearings of the electric motors and other sizes characterizing technological process.

  

Appointment

 The control system is necessary for increase in efficiency and quality of process of management of cooling of water by means of coolers.

 The control system provides speed control of rotation of driving wheels of ventilatory installations of coolers, depending on the taken temperature of chilled water at the exit from the cooler. The measured values of temperature which is entering (heated) and the coming-out (cooled) water, and also values of vibration of electric motors are induced on the information display.

 

The control system displays key parameters: the set speed, output frequency, current and tension of the engine, output power, the moment, a condition of discrete entrances exits, the general operating time and so forth.

 

The control system makes control of the feeding tension of electric motors, protects from overloads on current and tension, from a distortion or loss of a phase of a power line, from an overheat of windings and bearings of electric motors, from excess of vibration of the ventilatory max installations of value of a setting.  

Characteristic of objects of automation

The main object in the projected control system and protection is the common industrial asynchronous electric motor which sets the driving wheel of ventilatory installation of the cooler in motion. For the purpose of increase in energy efficiency of use of coolers, electric motors of ventilatory installations are operated by means of converters of frequency of Schneider Electric, ABB, Siemens,  Danfoss, Emerson, Mitsubishi Electric PCh, temperature sensors, is more rare with use of sensors of pressure, an expense, level, etc., and also by means of various program devices, cards of the PCh expansion. Also devices of smooth start-up of UPP are used. Each electric motor can work through the PCh which will operate the speed of its rotation and to monitor possible emergencies. The modes of the multiengine and a multiconfiguration are possible, using one PCh on two and more electric motors.

  For ensuring trouble-free operation of the cooler, in case of failure of the converter of frequency or during routine maintenance of PCh, power supply of electric motors is provided in a case of management through the reserve By-Pass line.

Management of operating modes of a control system and indication of working parameters is carried out by means of touch panels of operator HMI Schneider Electric, Kinco, and also the Modicon Schneider Electric controllers, logical Logo Siemens modules, etc. providing automatic control of electric drives of mechanisms of processing equipment with respect for the set functional dependences (simultaneity, a certain sequence, the set frequency of rotation of ventilatory installations, etc.).

Depending on length of the feeding lines, recommendations about installation of additional throttles on an entrance to PCh and the electric motor will be provided.

 Structure and functioning of system

As a part of a control system it is possible to allocate the following compound units:

- the case of management (CM) which performs measurement of temperature of heated and chilled water, vibration of electric motors, and indication of the measured values on the information display. Also on ShU the Start-up buttons, Stop, Emergency stop of electric motors, the switch Manual/automatic for the choice of an operating mode, the Reverse button and the signalena of a lamp of indication of operating and emergency operation are installed.

 

- the converter of frequency of PCh which makes regulation of speed of rotation of the electric motor of ventilatory installation, depending on the measured value of temperature of chilled water. Besides PCh provides protection of electric motors against instability of a power line, against an overheat of bearings and windings of the electric motor. In case of PCh exit out of operation, the possibility of power supply of electric motors through By-Pass is provided.

 

- the terminal box (TB), is intended day of installation on the cooler in close proximity to each electric motor. On a terminal box the Start-up buttons, Stop, Emergency stop and the Reverse in coordination with the Customer are installed.

The button Emergency stop has execution with fixing (fungus button) and gives the chance to break off the feeding chain of the corresponding electric motor in the place, in case of an unforeseen situation and need of the emergency stop.

Also through a terminal box all sensors are connected: water temperature sensors, sensors of vibration of electric motors, sensors of temperature of bearings and temperature of windings of the stator.

 

Modes of functioning of system:

- an automatic operating mode, with regulation of speed of rotation of electric motors via frequency converters;

- a manual operating mode, with regulation of speed of rotation of ventilatory installation in the manual mode;

- a remote operating mode from dispatching office;

- mode of reversive rotation;

- an operating mode through By-Pass.

 

The list of emergencies on which reliability is regulated

During the work of system the following emergencies which influence reliability of work of system are possible:

- failure in power supply of electric motors (distortion of phases, break of one of phases,   excess of currents and tension);
- excess by vibration of electric motors of value of a setting;
- overheat of windings of electric motors;
- overheat of bearings of electric motors;

At emergence of one or several emergencies there is a cooler electric motor stop on which there was an emergency. The code of the arisen accident, date and time of its emergence are fixed in non-volatile memory.

Ergonomics and industrial art

The control system provides process of management of cooling of water, convenient and clear for the operating personnel, in coolers. Regarding external design:

- all governing bodies located on a case of management, frequency converters terminal boxes have signatures of their functional purpose;

- at indication of each measured parameter, on displays the name of the measured size and unit of its measurement is displayed;

- if necessary there is a possibility of carrying out correction of values of settings of temperature and vibration.

 

Safety of information at accidents

In system the archiving of emergencies with their binding to time and date of emergence is provided. Information on accidents which took place to be, to be stored in non-volatile memory or on the external store.

 

Protection against influence of external influences

- The system has a possibility of functioning at fluctuations of tension of power supply in limits (380 ± 20%).

- The system has a possibility of functioning in the range of the admissible ambient temperatures established by the manufacturer of hardware.

- The system has a possibility of functioning in the range of the admissible values of humidity of the environment established by the manufacturer of hardware.

- The system has a possibility of functioning in the range of admissible values of the vibrations established by the manufacturer of hardware.

 The functions which are carried out by system

The case of management performs the following functions:

 1)  Measurement of temperatures of the entering and coming out water and their indication.

2)  Measurement of vibration of electric motors and their indication.

3)  Formation of a task for speed for the frequency converter, proceeding from the measured value of chilled water at the exit from the cooler.

4)  Formation of a signal at achievement of vibration of the corresponding electric motor of value of a setting of 7 mm / with and an emergency stop, at increase of vibration is higher than value of a setting of 10 mm / page.

5)  Start-up, Stop of each electric motor in the automatic or manual mode, in the direct or reversive direction of rotation.

6)  Emergency stop of each electric motor in the place.

7)  Switching of operating modes Manual/automatic and directions of rotation of the electric motor Forward / Reverse.

8)  Switching of diets of electric motors via the converter of frequency or through By-Pass.

9)  Indication of the current operating mode or emergencies of the cooler by means of alarm lamps and the information display on the forward panel of a case of management.

 

10)  An archiving of the arising emergencies with their binding to a temporary grid.

The converter of frequency performs the following functions:

 1)  Regulation of speed of rotation of the electric motor of separate ventilatory installation, depending on temperature of chilled water in the automatic mode, for the purpose of achievement of the most effective cooling of reverse water at essential economy of energy.

2)  Formation of an emergency at an overheat of windings or bearings of the electric motor.

3)  Formation of an emergency at emergence of overloads on current and tension, at a distortion or loss of a phase of a power line of the electric motor.

4)  A manual task of speed of rotation of ventilatory installation, during the work in the manual mode.

 

The terminal box performs the following functions:

Start-up, electric motor Stop, when pressing the corresponding button KK.

2)  The emergency stop of the electric motor when pressing the button Emergency Stop

3)  Ensuring impossibility of launch of the electric motor, when finding the button Emergency Stop in the pressed situation.

4)  Connection of alarm cables from sensors of water temperature, temperature of windings of the electric motor, temperature of bearings of the electric motor, vibration of electric motors.

 

The scheme of the organization of control of electric drives can provide local, remote and automatic control. All three types of management are applied in all possible combinations. The greatest distribution was gained by the structures of management providing: local and remote control; local and automatic control; local, remote and automatic control.

The type of control of the electric drive (local, automatic or remote) is chosen by means of switches of chains (switches of a type of management) which are installed on local cases of management, directly on platforms of service of ventilatory installations, dispatching boards and control panels.

In a control system where air TEN is provided, anti-condensate heating of the case of the electric motor is carried out. In the presence of a reducer there is a heating of gearbox oil.

 Also long work of ventilatory installations at minimum possible frequency + 15 Hz is in working order provided in the winter period against frosting of entrance windows of the cooler and maintenance of isolation of each electric motor.

Short-term work (inclusion for 15-20 min.) ventilatory installations in the reverse mode - 15 Hz is allowed. 

 

 

 

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Control system and protection of electric motors of ventilatory coolers
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