1. Characteristics of Harsvert frequency converter

        High-High voltage resource VFD, direct 3,4.16,6,6.6,10,11kV input, direct 3,4.16,6,6.6,10,11 kV output, no output transformer necessary.

                Power factor is 0.95 in 20~100% load, low harmonic current, no power factor compensator or harmonic control device required

        Sinusoidal step PWM output wave, no output filter required, can be directly connected to common motor, no harm to the insulation of the cable or motor. Soft start function, no voltage reduction resulted from impact of motor start.

        Output waveform of VFD do not bring resonance for motor, torque pulse is less than 0.1%. it can reduce fans surge. VFD has resonance point skip function.

        No requirement to output cable. Motor is not influenced by common mode voltage and dv/dt.

        Complete microcomputer control, self-detection. VFD can display failure and remote alarm, which is convenient for personnel to solve problem.

        Local control and remote control, support Profibus, Modbus, TCP/ IP etc. various communication protocols.

        Torque character: 0~50 Hz constant torque, rated torque output, torque step response < 200ms. Up 50 Hz, constant power, maximal torque decreases in inverse proportion to speed.

        VFD can stand 35% voltage reduction of electric net and continue working, not trip off.

        Technique of cell-cascaded, better output waveform, no special requirement to motor and cable.

        Power cell manufactured with IGBT is high in redundancy; technique of self-bypass of power cell; system reconstructs voltage vector when failure power cell quits to operate, enhancing utilization of voltage; ensure 96% of output voltage when single power cell is broken in 8 level series.

        Start up again after power failure recovery: when power faults and recovers within set time ( default time: 20s ), VFD will self-start. System searches motor speed automatically to start again without impact, recovering original operation state.

        Starts up again during rotating.

        Main circuit is linked with controller by optical fiber, which make the system extremely safe and away from electromagnetic disturbance.

        Multi-ply rectifier technique, small harmonic, high power factor, up to standard IEEE std 519-1992.

        Friendly and easy interface.

        Redundancy design for control power source: AC220V or AC380V(three phase four wire) is applicable to HARSVERT VFD and double channel AC 220V at the same time, mutual standby. Double power source auto-turn switch ensure stability of control power source. Furthermore, DC220V, even DC110Vcan be spare power source, realizing mutual standby of AC and DC.

        Self-adaption of acceleration and deceleration.

        Complete fault monitor circuit, accurate fault alarm protection. Protection including: over voltage, over current, low voltage, phase lack, over load, over heat, earth and short circuit.

        VFD protects in classes and can operate in failure status to achieve continuous operation at the most.

        Compatible with an industry standard signal of 010V/420mA

        Integrated PID regulator according users requirement.

        Exceptional performance/price ratio

2. Parameters