【正文】 , energy feedback unit applies to need to stop quickly of occasions, such as rolling mill, large longmen planer, spindle etc, , energy feedback unit work may apply to other motors in renewable power state occasions. Four, energy feedback element and braking unit difference Energy feedback unit is renewable power of electric motor to power grid (right now meter feedback inversion), supply other equipment use, feedback efficiency can reaches as high as 97% above. And braking unit needs and braking resistance are used together, motor power generation of electricity consumption in regenerative braking resistance into heat wasted. In addition, using braking unit and braking resistance of braking unit, pared with energy feedback braking torque is small, can39。t use this energy consume, so with dc bus voltage will rise, the influence of the frequency converter working normally. Energy feedback unit, through the automatic detection inverter with dc bus voltage, frequency converter dc link of dc voltage inverter with frequency voltage into with the same phase ac voltage, via multiple noise filter link after connected to exchange work, so as to achieve the purpose of energy feedback work, back to the grid electricity generating energy reached 97%, and effectively save electric energy. Second, energy feedback unit matters needing attention , energy feedback unit and its connected device internal have endanger the personal safety of high pressure, wrong operation or improper installation may lead to personal property loss, so that the proposed by specially trained personnel installation operation. , installation and wiring, in order to ensure the safe, please make sure to energy feedback unit and connected to it inverter power supply all disconnect and waits for 5 ~ 10 minutes, stay inverter internal capacitance stored in electricity discharge is finished, all can only operate. , energy feedback unit and converter as close as possible to the farthest distance, do not exceed 2 meters. , because energy feedback unit interior special design allows the user can not consider the grid sequence, namely: energy feedback unit of A, B and C terminals need not to the grid A, B and C or frequency converter input R, S, T onetoone. But connection request when energy feedback unit of A, B and C terminals must and inverter munication input terminals R, S, T directly connected, can not through any intermediate switches or contactors, also can not connected to other ac circuits. , energy feedback unit DC (+) terminal and converter DC bus is connected, DC () and converter DC bus negative connected the two cable advice adopting soft cable, and stranded inner connection, in order to reduce radiation. , located on the radiator PE site wiring screws, please connect real reserve, could not connect grid neutral (neuter line). , energy feedback unit designs for natural cooling way, so he asked energy feedback unit within the fluctuation, left 100mm 30mm inside cannot have other things influence the air flow shade. Third, energy feedback unit applicable occasions , energy feedback unit used in potential type load such as: oil pumping unit, mine hoist, etc。 Or large inertia load such as: fan, cement system pipe, Dynamic balancing machines etc。s customary problem. When set up the stack area, does not mean that the region as a dedicated memory, it can be as mon as the use of memory region, but under normal circumstances programming will not put it as an ordinary memory use. AVR single chip The AVR core bines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. The ATmega8 provides the following features: 8K bytes of InSystem Programmable Flash with ReadWhileWrite capabilities, 512 bytes of EEPROM, 1K byte of SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible Timer/Counters with pare modes, internal and external interrupts, a serial program mable USART, a byte oriented Twowire Serial Interface, a 6channel ADC (eight channels in TQFP and MLF packages) where four (six) channels have 10bit accuracy and two channels have 8bit accuracy, a programmable Watchdog Timer with Internal Oscillator, an SPI serial port, and five software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt system to continue functioning. The Powerdown mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next Interrupt or Hard ware Reset. In Powersave mode, the asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except asynchronous timer and ADC, to minimize switching noise during ADC conversions. In Standby mode, the crys tal/resonator Oscillator is running while the rest of the device is sleeping. This allows very fast startup bined with lowpower consumption. The device is manufactured using Atmel’s high density nonvolatile memory technology. The Flash Program memory can be reprogrammed InSystem through an SPI serial interface, by a conventional nonvolatile memory programmer, or by an Onchip boot program running on the AVR core. The boot program can use any interface to download the application program in the Application Flash Memory. Software in the Boot Flash Section will continue to run while the Application Flash Section is updated, provid