High Voltage AC Drive

Frequency Converter 1.Functional characteristics of the System Bypass SNG 5100 series high-voltage variable frequency speed regulating device is featured by sys tem fault by bypassing system faults and transfer power frequency operations. Power frequency bypass is designed to automatically change the motor running to power frequency running whe n a sudden failure occurs during speed regulation to ensure that production is operated continuously. Three options are available for you to choose power frequency bypass:Option 1: Manual power frequency bypass that is composed of three high voltage isolators and instrument trans forme rs.Op tion 2: Automatic power frequency bypass that is composed of three high-voltage vacuum contactors and instrument transformersOption 3: Automatic and manual power frequency bypass that is composed of three high-voltage vacuum contactors, three high voltage is olators an d instrument transformers. 2. Features of Perfect Harmony and Power Factors The power supply at the side of electric power grids of SNG5100 series high-voltage variable frequency speed regulating device is isolated by multiple second winding of phase-shifting rectifier transformers, and adopts enlarged triangles for connection. The mutual deviation of each output phase is 12 electrical degree, equivalent to 36 channels of impulse commutation, which effectively eliminates harmonic waves, greatly improves waveforms of the electricity grid system, as well as improve power factors. The system is a VSI transformer, and keeps running with high power factors in the same load range (see Figure 5 Comparison of power factor characteristics) compared with current source transformers.With advanced multiple-level output technology, the system is overlaid by multiple IGBT power units in series connection, and outputs pure sine waves, which effectively redu ces outp ut dv/dt, and prev ent the insulation of motors \and cables from being damaged, as well as prolong the length of output cables. The system is a typical "perfect harmony variabl e frequ ency sp eed r egul atin g dev ice" , and definitely red uces the harmonic loss of motors. The system also reduces the mechanical force of shaft bearings and impellers, and eliminates mechanical vibration, thus greatly improve the service life of equipment such as motors, Fans and pumps. (See Figure 6 Oscillogram). 3. Functional characteristics of the Master Control Unit and Standard Communication Interfaces The master control unit of the SNG5100 series high-voltage variable frequency speed regulating device ad opts the world's advanced transmission control technologies and exclusive double digital DSP integrated signal processor and p rogrammabl elogic controller (PLC) as the core technology. The system properly takes multiple measures such as isola tion for high voltage/low voltage and filtering with hardware/software to improve reliability and capacity of resisting disturbance. Double Digital Signal Process (DSP) is featured by very large scale integrated circuit (VLSIC), accurate col lected dat a, and fast calculation speed, with perfect monitoring and protection functions. Multiple methods are used in design, such as digital filtering, software/hardware watchdogs, software redundancy, and software traps, thus improving the anti-interference performance. You can cut off the power of the master control unit without switching off the system, thus a voiding th e failure of the controlling power. With leading technologies of fiber -optic communication, the master control unit control sall power units to ensure reliable control and efficient protection. The programmable logic controller (PLC) of the system can. 4. Features of Automatic Bypass of the IGBT Power Unit 5. Overcurrent Diversion and Overvoltage Blockade SNG5100 is featured by unique technologies of overcurrent diversion and overvoltage blockage, which are the patents of the Company. Electrical equipment (products) is faulty by over current or voltage, especially for inverters. The sudden change of loading on Fans or pump motors caused an abrupt change of current during temporary locking of motors, so that motors are heavily loaded and produce overcurrent, which make the speed regulation system faulty. To solve this problem, the proprietary technology of the Company aims to add a set of current division circuit. If the current is higher than the preset protection value, the circuit is automatically connected to divided current; after the overcurrent, the circuit automatically exists divided current, and ensures that no overcurrent or overloading occurs on the system at all working conditions. You can set overcurrent protection values according to actual working conditions. Overvoltage is produced if the electrified wire fence voltage fluctuates and causes overvoltage. If overvoltage is greater than the preset protection value due to any cause, the double DSP main control is automatically blocked to prevent overvoltage on the system. This ensures the safety, reliability and stability of the production. 6. System Control Functional characteristics 7. Functional Characteristics of LCD Working Platform SNG5100 series high-voltage variable frequency speed regulation system is equipped a true color LCD touch screen in Chinese, with plentiful of applications. You can efficiently set motor/inverter parameters online on the touch screen, such as soft start, close down, acceleration, deceleration and exit alarms, as well as properly measure, display, input and output complete event records such as operation voltage, current, power, frequency, communication, strong current status, external faults, unit faults, system status, and alarms. 8. Functional Characteristics of System Protection and Self Diagnostics SNG5100 series high-voltage frequency speed regulation system has perfect protection functions for lack of phase, short circuit, overload, overvoltage, undercurrent, undervoltage, and over temperature, as well as other functions such as sound and light alarms for faults, fault diagnosis and recognition, recognition of incorrect manipulation, self diagnosis, and self positioning. 9. Continuous Operation of Automatic Re-closing System of the Wire Fence SNG5100 series high-voltage variable frequency speed regulation system operates continuously when the power supply of the electrified wire fence is automatically re-closed in the standard time. If the motor is about to stop after power failure, when the power is supplied again, the system raises the speed as quick as possible. If the power has been cut off for too long, the system automatically restarts. 10. Capability of Reaction to Sharp Fluctuation of Network Voltagee SNG5100 series high-voltage variable frequency speed regulation system continues operation under full load when the network voltage varies within 70-120% of the rated value.