technical Description of CT110 Series Inverter
The CT110 frequency converter is based on a DSP control system and adopts domestically leading PG free vector control technology, combined with multiple protection methods, which can be applied to asynchronous motors and provide excellent driving performance. The product has greatly improved customer usability and environmental adaptability in terms of air duct design, hardware configuration, and software functionality.
● Technical features
1. Water supply dedicated logic: Based on on-site working conditions, the water supply logic provides more stable constant pressure control performance.
2. Accurate motor parameter self-learning: Accurate self-learning of rotating or stationary motor parameters, easy debugging, simple operation, providing higher control accuracy and response speed.
3. Vectorized V/F control: automatic stator voltage drop compensation, VF control can also ensure excellent low-frequency torque characteristics.
4. Software current and voltage limiting function: good voltage and current control, effectively reducing the number of protection times for the frequency converter.
5. Multiple braking modes: Provides multiple braking modes for quick parking.
6. High reliability design: With a higher overall overheating point and good protection level, it is more suitable for the usage environment of the water supply industry.
7. Speed tracking restart function: Achieve smooth start of rotating motors without impact.
8. Automatic voltage adjustment function: When the grid voltage changes, it can automatically maintain a constant output voltage.
9. Comprehensive fault protection: protection functions for overcurrent, overvoltage, undervoltage, overtemperature, phase loss, overload, etc.
Conclusion
Applying frequency conversion technology to central air conditioning systems is of great significance in improving the automation level of central air conditioning, reducing energy consumption, minimizing impact on the power grid, and extending the service life of machinery and pipelines.
CT110 Water Supply Logic Explanation
The CT110 series dedicated frequency converter has built-in water supply specific logic and optimized PID control to ensure constant water pressure. At the same time, it automatically processes the logic of adding and subtracting pumps, and automatically adjusts the frequency during the pump addition and subtraction stages to ensure that the water pressure remains stable and controllable during the pump addition and subtraction process. The water supply logic is explained as follows:
1. Pump addition logic: When the water pressure continues to be lower than the set pressure, the frequency converter accelerates and runs. When the frequency converter accelerates to the pump addition frequency point (F13.01), if the water pressure is still lower than (set water pressure percentage) - (pump addition pressure tolerance percentage F13.02), it is considered that the current number of water pumps is not enough to use, and the water pumps need to be increased in operation. After the pump addition delay time is reached, the auxiliary relay will act, and the pump will run at this time.
2. Pump auxiliary logic: The newly added pump is a power frequency pump, which may cause a rapid increase in water pressure during the pumping process. Therefore, the variable frequency pump will automatically reduce its frequency during the pumping process to avoid excessive water pressure. The deceleration time of the variable frequency pump at this time is determined by F08.01.
3. Pump reduction logic: When the water pressure continues to be higher than the set pressure, the frequency converter runs at a reduced speed. When the frequency converter decelerates to the pump reduction frequency point (F13.04), if the water pressure is still lower than (set water pressure percentage)+(pump reduction pressure tolerance percentage F13.05), it is considered that the current number of water pumps is too many and the pump operation needs to be reduced. After the delay time of the pump reduction is reached, the auxiliary relay will act, and the pump will run at this time.
4. Pump reduction auxiliary logic: The newly reduced pump is a power frequency pump, which may cause a rapid drop in water pressure during the pump reduction process. Therefore, during the pump reduction process, the variable frequency pump will automatically increase the frequency to avoid low water pressure when adding the pump. The acceleration time of the variable frequency pump at this time is determined by F08.00.
5. Sleep function logic: When the auxiliary pumps have stopped and the water pressure is still high, the frequency converter will run at a reduced speed. When the frequency of the frequency converter is lower than the pump reduction frequency point, the frequency converter will automatically sleep and the keyboard will display the "SLEEP" status.
6. Sleep and wake-up logic: In the sleep state of the frequency converter, when the water pressure is low, the set frequency calculated by the PID is higher than the wake-up frequency setting, and the current pressure is lower than (set water pressure percentage) - (wake-up pressure tolerance percentage F13.02), it is considered that the frequency converter pump needs to run. After a wake-up delay, the frequency converter pump will sleep and wake up.
7. Priority of water pump control: The priority of water pump participation in operation is: variable frequency pump>auxiliary pump 1>auxiliary pump 2. That is, when it is necessary to add a pump, first add a variable frequency pump, then auxiliary pump 1, and finally auxiliary pump 2; When it is necessary to reduce the pump, first reduce auxiliary pump 2, then reduce auxiliary pump 1, and finally reduce the frequency converter to sleep and standby.
Characteristics of Variable Frequency Energy saving System
1. The interface of the frequency converter is LED display, with rich monitoring parameters; The keyboard layout is simple and easy to operate;
2. The temperature/temperature difference sensor is a digital dual screen LED display, with convenient temperature parameter setting and easy monitoring;
3. The frequency converter has various electronic protection devices such as overcurrent, overload, overvoltage, and overheating, and has rich fault alarm output functions, which can effectively protect the normal operation of the water supply system;
4. After installing a frequency converter, the motor has soft start and stepless speed regulation functions, which can greatly reduce the mechanical wear of the water pump and motor and extend the service life of the pipe group;
5. The frequency converter is equipped with a large capacity filtering capacitor inside, which can effectively improve the power factor of electrical equipment;
6. The system realizes PID closed-loop regulation of temperature, ensuring stable indoor temperature changes and providing a comfortable feeling for the human body.