The supplier of the inverter energy feedback unit reminds you that the centrifuge is a high inertia constant torque device, and it is precisely this mechanical characteristic that makes the braking unit one of the main components of the centrifuge operation control. It is of great significance for the process control and mechanical efficiency improvement of the centrifuge. When the centrifuge slows down, if free parking is used, the actual parking time of the centrifuge will exceed 2 hours, which greatly restricts the use and process control of the centrifuge. Using mechanical braking method not only takes too long for larger capacity centrifuges, but also poses significant risks to control and safety; So we can only use frequency conversion speed regulation braking method. When using frequency conversion speed regulation braking, the set braking time of the frequency converter is relatively short. Due to the large moment of inertia of the centrifuge, the rotating drum of the centrifuge drives the motor to rotate. At this time, the speed of the motor is higher than the synchronous speed of the output of the frequency converter. The motor is in a generating state, causing the DC bus voltage of the frequency converter to rise. If this energy cannot be consumed and the DC bus voltage remains within the normal range, the frequency converter will have a DC overvoltage alarm fault and cannot work normally; In order to consume this regenerative energy, the braking unit and braking resistor cooperate with each other. When the braking unit detects that the DC bus voltage exceeds the normal working range value, the circuit channel between the DC bus and the braking resistor is opened to dissipate the regenerative energy generated by the motor on the braking resistor, thereby limiting the DC bus voltage and allowing the deceleration process to proceed normally.
Due to technological and cost limitations, previous centrifuge equipment manufacturers have adopted the above-mentioned energy consumption braking method. The regenerative electrical energy generated by the motor is directly consumed in the braking resistor, and a large amount of regenerative braking electrical energy cannot be utilized. Moreover, the braking unit and braking resistor are limited by the distribution room environment in terms of power, otherwise a large amount of heat will cause overheating protection of the braking unit and frequency converter, affecting the smooth progress of production. With the continuous development of electronic technology, energy feedback braking units are gradually being developed and utilized. Imported feedback braking units are limited in use due to their high price, long recovery period, high maintenance costs, and high maintenance level requirements. Nowadays, Shenzhen Hexing Energy has developed multiple series of energy feedback products with world leading technology, making the widespread application of feedback products a reality.
Among numerous domestic and international feedback braking units, the PSG sine wave energy feedback device produced by Shenzhen Jianeng is more widely accepted by users. Its characteristics are as follows:
1. Comprehensive energy-saving rate up to 20%~60%
2. Meet the stringent EN55022 Class A technical standard
Output sine wave, THD<5%， Always provide clean electricity feedback
3. Adopting automatic phase sequence discrimination technology
By using automatic phase sequence discrimination technology, the phase sequence of the three-phase power grid can be freely connected without the need for manual differentiation.
4. Built in fuse
Short circuit protection is in place to ensure the safe operation of the frequency converter.
5. It can automatically disconnect from faults to ensure the normal operation of the frequency converter
It is redundant with the original control system of the frequency converter and does not change the original control mode of the frequency converter.
6. Adopting multiple cutting-edge technologies, compatible with all brands of frequency converters
7. The energy conversion efficiency is as high as 97.5%, always leading the industry
We ensure such perfect conversion efficiency without sacrificing the quality of renewable energy and the stability of other equipment, which makes it even more valuable.
8. Built in reactor and filter, plug and play
PSG adopts an integrated structural design, with built-in reactors and filters, so users do not need to purchase separately.
9. Completely replace resistance braking
PSG can completely replace resistance braking, transforming energy consuming components into power generating components and saving over 60% of installation space.
10. Eliminate safety hazards
Remove high-power resistors that generate heat, significantly reduce the temperature of the production environment, and eliminate safety hazards.
11. Can extend the service life of other devices
Reduce investment in cooling equipment and save costs; Reducing static electricity can extend the service life of other mechanical and electrical equipment.
12. The selection is simple and does not require tedious calculations of resistance, torque, etc.
13. Easy to operate, reducing installation and training costs
Before leaving the factory, each PSG product has already been set with technical parameters that meet over 90% of the requirements, making it plug and play; At the same time, in order to meet the requirements of complex working conditions, users only need to adjust the action threshold simply to ensure 100% use. Therefore, even if you are not a technical expert, you can quickly get started operating PSG.
14. Applicable to global grid frequencies, with no geographical restrictions on application
PSG product THD meets global harmonic standards; EMC/EMI meets the most stringent EN55022 Class A standard; Stable operation can be achieved at grid frequencies ranging from 45Hz to 65Hz.
Therefore, the application of PSG products is completely independent of regional restrictions.
Energy-saving analysis
Due to the use of PSG sine wave energy feedback device, the operating potential energy of the centrifuge drum carrying materials is converted into regenerated electrical energy and directly fed back to the power grid during deceleration, thus saving a lot of electricity and reducing corresponding electricity expenses. In addition, after adopting PSG energy feedback, the use of air conditioning in the distribution room has been saved, the operating environment of electrical equipment has been improved, and energy-saving effects have been achieved on the other hand. Therefore, this investment is very beneficial for the company.