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Introduction INVT MVD for sugar mill application for fibrizer, Chopper & Mill.

Assembly workshop of MVD INVT CHH100 MVD

Technical features of INVT MVD outstanding energy saving effect outstanding energy saving effect High reliability Prefect protection function Prefect protection function ◆ Double power supply redundant design for control system; ◆ Abundant power unit monitor function, detect the power unit temperature, DC bus voltage, adjust system in advance to prevent failure. ◆ 11 kinds power cell fault protection function; ◆ More than 20 kinds protection for inverter and motor; ◆ Protection threshold can be adjusted according to working conditions. ◆ Automatically adjust the output voltage according to the load, save more energy for customers. Bypass for system and power cell Bypass for system and power cell ◆ Auto-switching between power frequency and variable frequency technology; ◆ bypass the fault power cell in 200ms, will not cause MVD stop; ◆ synchronous switchover technology, switching the system between power frequency and variable frequency smoothly

Speed tracing and start function Speed tracing and start function Good adaptability for voltage fluctuation Good adaptability for voltage fluctuation complete parameters record complete parameters record ◆ The MVD can output 100% torque while the voltage fluctuation range is ±10%; ◆ MVD run derating without protection when input voltage dropping to 65% rated voltage at short time (30s); ◆ Indicate multi-parameters in running status, temperature of each module, DC bus detection and indication, provide with fault indication, record and self-diagnostic function. ◆ When the instantaneous power off, the MVD can be started smoothly by speed tracing function; ◆ the system can be switched from power frequency to variable frequency smoothly. high efficiency high power factor low harmonics high efficiency high power factor low harmonics ◆ Efficiency ≥98 ％ at rating load ◆ Input power factor ≥0.96; ◆ Input & output harmonic ＜ 2 ％

Typical diagram of 690V VFD connections

Typical diagram of 11KV MVD connections

690V, VFD It needs additional step-down transformer, the cable length will be longer, and the transformer cause energy lose, which adds cost. The harmonic distortion is very high, which calls for additional electric devices like EMC filters and harmonic filters 11KV, MVD VFD comparison Adopt multi-power cell parallel connection technology, Input & Output harmonic less than 2% The starting current is very high, which may cause current shock for grid The starting current is low, reduce the current shock for the grid Additional transformer is unnecessary The system can be bypassed The system can not be bypassed

690V, VFD For output side, consider the dv/dt problem, output reactor or filter is recommended The output cable length is limited 11KV, MVD VFD comparison The output cable length without any limitation. Beneficial to system expansion The system is difficult for maintenance The system is modularized structure, it easy for maintenance The output reactor and filter is unnecessary The operation interface is not friendly for customer. HMI is used, the system is easy to be operated and monitored, the interface is more friendly.

690V, motor Volume of the motor is big The output current is big, the cross section of cable should be big, wiring connection is difficult. 11KV, motor Motor comparison The output current is small, big cross section of cable is unnecessary, wiring connection is easy. Copper loss of motor is bigCopper loss of motor is small Volume of the motor is small

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