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The principle of intelligent controller and its application in fans and pumps
I. Introduction Fans and pumps are a kind of general-purpose machinery, which is widely used in various fields such as industry, agriculture and life. At the same time, various design codes also have corresponding specific requirements for the control and protection of fans and pumps in different situations in the construction field. With the rapid development of the construction industry, building automatic monitoring systems (BAS, Build Automatic Monitor System) are also commonly used in buildings and large-scale public building construction projects. 2. Intelligent controller The intelligent controller uses the 32-bit ColdFire V1 core MCF51EM256 processor introduced by Freescale as the control core, 4 channels of 16-bit SAR ADC, 3 SPI, 3 SCI and 1 I2C interface, 3 timing module hardware, independent The RTC clock and two LASH memories, abundant GPIO ports, and abundant CPU Katayama resources ensure the reliability and advancement of the module. The controller integrates measurement, protection, control, and bus communication. It replaces the original protection relays, electrical measuring instruments, changeover switches, buttons and signal indicators that are configured with separate components. It integrates direct start, star-delta start, etc. Various control methods. At the same time, it provides records of important management information such as operation times, running time, and trip events. The bus communication function can carry out data exchange and remote control with the management system, which improves the intelligent level of the building and simplifies the traditional control cabinet design.
Published:
2020-11-11 11:44
I. Introduction
Fans and pumps are a kind of general-purpose machinery, which is widely used in various fields such as industry, agriculture and life. At the same time, various design codes also have corresponding specific requirements for the control and protection of fans and pumps in different situations in the construction field. With the rapid development of the construction industry, building automatic monitoring systems (BAS, Build Automatic Monitor System) are also commonly used in buildings and large-scale public building construction projects.
2. Intelligent controller
The intelligent controller uses the 32-bit ColdFire V1 core MCF51EM256 processor introduced by Freescale as the control core, 4 channels of 16-bit SAR ADC, 3 SPI, 3 SCI and 1 I2C interface, 3 timing module hardware, independent The RTC clock and two LASH memories, abundant GPIO ports, and abundant CPU Katayama resources ensure the reliability and advancement of the module.
The controller integrates measurement, protection, control, and bus communication. It replaces the original protection relays, electrical measuring instruments, changeover switches, buttons and signal indicators that are configured with separate components. It integrates direct start, star-delta start, etc. Various control methods. At the same time, it provides records of important management information such as operation times, running time, and trip events. The bus communication function can carry out data exchange and remote control with the management system, which improves the intelligent level of the building and simplifies the traditional control cabinet design.
3. Fan control scheme
The National Standard Design Atlas "Commonly Used Motor Control Circuits" (10D303-2) collects the control circuits of commonly used fans in buildings, including exhaust fans, dual-purpose single-speed fans, exhaust and smoke dual-use dual-speed fans, etc. This kind of scheme is convenient for electrical designers to design and improve work efficiency. However, with the introduction of building energy-saving requirements and building equipment monitoring system technical specifications, the control scheme using the original atlas discrete component method can no longer meet the requirements of equipment upgrades and the requirements of the monitoring system for equipment monitoring content.
3.1 Principle of ordinary fan control
The standard requirements for the linkage of ordinary fans and electric dampers are: "All AC motors should be equipped with phase-to-phase short-circuit and ground fault protection, and overload, phase-out and low-voltage protection should be installed according to specific conditions." When the fan starts, the damper opens: return to manual/automatic mode to DDC, receive DDC control signal in automatic mode, protect against short circuit or overload failure during operation, indicator light alarms, and return fan failure signal to control point .
Related News
2020-11-25
How do dry-type transformers judge faults through various sound abnormalities
When dry-type transformers are running, there is no noise at all. This is normal, but sometimes there will be a lot of noise, which means that you can judge whether the transformer is faulty by sound. In fact, the sound of the dry-type transformer can also be seen whether there is damage to the dry-type transformer. If there are several problems in the sound of the dry-type transformer, it means that the dry-type transformer is malfunctioning and needs to be repaired. When common dry-type transformers are running, these sound problems indicate that your dry-type transformer is broken. Let’s take a look at it in detail below: There is noise in the dry-type transformer. If the sound of the transformer is higher than normal and there is noisy noise, but the current and voltage are not abnormal, it may be caused by the loosening of the clamp or the screw pressing the iron core, which makes the silicon steel sheet vibrate. There is a discharge sound from the dry-type transformer. If partial discharge occurs on the transformer or the surface, there will be a "crack" discharge sound in the sound. When this happens, if you can see blue corona or sparks near the transformer bushing at night or in rainy weather, it means that the porcelain is very dirty or the equipment clamps are in contact; if the transformer discharges, it is not Electrostatic discharge of grounded parts, or contact discharge of tap changer, the transformer should be further tested or disabled. There is a sound of boiling water in the dry-type transformer. If the sound of the transformer is mixed with the sound of water boiling, the temperature changes, and the oil level rises, it should be judged that the transformer winding has a short-circuit fault, or the tap switch has caused serious overheating due to contact, and the transformer should be stopped for inspection. There is a popping sound in the dry-type transformer. If the sound of the transformer is mixed with uneven popping sound, it is the insulation breakdown of the transformer or the surface. At this time, the transformer should be stopped for inspection. The above sound problem is a detail that cannot be ignored. Everyone should take good care of it. Otherwise, it will not work well. Not only does the dry-type transformer do not work well, it may also shorten the service life!
2020-11-25
Do you know all the wiring methods of dry-type transformers?
Users need to master the wiring method when using dry-type transformers. If there is a problem in the wiring, it is easy to cause malfunction. So what is the wiring method of the dry-type transformer? The following editor will introduce it in detail. Wiring method of dry-type transformer: 1. Short-circuit the "input" and "output" terminals of the transformer to test the insulation resistance with the ground wire with a megohmmeter. When measuring with a 1000V megger, the resistance is greater than 2M ohms. 2. The cross-section wiring of the transformer input and output power lines should meet the requirements of the current value; it is appropriate to configure the current density at 2-2.5 A/min2. 3. The input and output three-phase power lines should be connected to phase A, phase B, and phase C respectively according to the color of the busbar of the transformer terminal block, yellow, green, and red. The neutral line should be connected to the neutral neutral line of the transformer, the grounding line and the transformer The shell and the transformer point are connected. The ground and neutral wires we usually talk about are drawn from the neutral point of the transformer. (For example, the transformer box should be connected to the corresponding ground mark of the box body). Check the input and output lines to confirm that they are correct. 4. First power on at no-load and observe and test that the input and output voltages meet the requirements. At the same time, observe whether the machine has abnormal noises, sparks, odors and other abnormal phenomena. If there are abnormalities, please disconnect the input power. 5. After the no-load test is completed and normal, the load can be connected.
2020-11-11
Do you know how the transformer is operated and maintained? Senior electrician explained, gain knowledge
One. Several rated operation modes of transformers 1. Allowable range of transformer voltage change For a power transformer, if the voltage is not higher than its rated voltage, then this will not have a great impact on the transformer itself, but will only reduce the output of the transformer; In a transformer, if the voltage has exceeded its rated voltage, this will increase its reactive power loss and core loss. Therefore, this will have some bad effects on the insulation performance of the transformer.
2020-11-11
Use and maintenance of dry-type transformers
With the exception of individual product series, dry-type transformers with air as the insulating medium are less able to withstand impulse voltage than oil-immersed transformers. Therefore, their use conditions are generally limited to indoors that are not directly connected to overhead lines, so they will not be exposed to the atmosphere. Otherwise, special lightning protection should be added to ensure that the amplitude of atmospheric overvoltage does not exceed the amplitude of the power frequency test voltage.
2020-11-11
The principle of intelligent controller and its application in fans and pumps
I. Introduction Fans and pumps are a kind of general-purpose machinery, which is widely used in various fields such as industry, agriculture and life. At the same time, various design codes also have corresponding specific requirements for the control and protection of fans and pumps in different situations in the construction field. With the rapid development of the construction industry, building automatic monitoring systems (BAS, Build Automatic Monitor System) are also commonly used in buildings and large-scale public building construction projects. 2. Intelligent controller The intelligent controller uses the 32-bit ColdFire V1 core MCF51EM256 processor introduced by Freescale as the control core, 4 channels of 16-bit SAR ADC, 3 SPI, 3 SCI and 1 I2C interface, 3 timing module hardware, independent The RTC clock and two LASH memories, abundant GPIO ports, and abundant CPU Katayama resources ensure the reliability and advancement of the module. The controller integrates measurement, protection, control, and bus communication. It replaces the original protection relays, electrical measuring instruments, changeover switches, buttons and signal indicators that are configured with separate components. It integrates direct start, star-delta start, etc. Various control methods. At the same time, it provides records of important management information such as operation times, running time, and trip events. The bus communication function can carry out data exchange and remote control with the management system, which improves the intelligent level of the building and simplifies the traditional control cabinet design.
2020-11-11
How to quickly understand the wiring diagram of the temperature controller? How to wire the two-wire three-wire temperature sensor?
Hello, my friends, I’m Big Brother, today let’s talk about the wiring of the temperature controller. There are many models of temperature controllers, and the output methods are slightly different, but the wiring principle is the same. As long as we understand the working principle, we can directly wire any temperature controller.
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