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FAQs Library
Q
Does INVT medium voltage VFD (MVD) can support motor temperature sensor?
2022-08-24
A

Yes.INVT MVD can support motor temperature  sensor terminals.
One solution is use temperature controller to collect signal, the information is showing on controller;
The other solution is use INVT PLC+PT to collect signal, the information is showing on HMI.

Q
What is the different for INVT medium voltage VFD (MVD) driving synchronous motor and asynchronous motor?
2022-08-24
A

INVT MVD can drive synchronous motor and asynchronous motor , only the MVD model name is different, others include cabinets,components and software is the same. Customer can set parameters to drive different motors.

Q
Does INVT medium voltage VFD (MVD) has grid line power momentary interruption and the MVD don't stop function?
2022-08-24
A

Yes.INVT MVD has this function. When the grid line power off briefly 0.1s-5s,the MVD can continue drive motor without fault.

Q
Why the medium voltage VFD (MVD) drive motor when running at 25-35Hz some times the ouput current vibration is huge?
2022-08-24
A

Because when MVD drive motor running at 25-35Hz,the speed of the motor and load reach at resonance frequency point,so the MVD output current vibration is huge. At this time, we can setting jumping frequency to aviod this resonance frequency point.

Q
Does INVT medium voltage VFD (MVD) can drive slip-ring motor?
2022-08-24
A

Yes.INVT MVD can drive slip-ring motor.
But need change the slip-ring motor rotor connection and remove brush.
Right diagram is reference for slip-ring motor renovation.

图片1.png

Q
Does INVT medium voltage VFD (MVD) need input and output filter? If no need, please expain the reason?
2022-08-24
A

The INVT MVD don't need input and output filter.
Because INVT MVD use shiffting transformer and multi-level output principle,it can counteract below 50th odd harmonic so the VFD input and output harmnic is low(THD less than 4%), input power factor is high (>0.97)and output du/dt is low,so it don't need input and output filter.

Q
How to calculate INVT medium voltage VFD (MVD )output electrical level?
2022-08-24
A

INVT MVD principle is multi-level output;
Take 6kv voltage for example,each phase has 5 pcs power cells, so the output level is:(2*5)+1=11 levels.
The formula is :Output level=(2*N)+1, the N is each phase power cell numbers.

Q
For INVT medium voltage VFD(MVD) how to calculate the input pluses?
2022-08-24
A

INVT MVD principle is multi-level output;
Take 3kv voltage for example, each phase has 3 pcs power cells and each power cell has 6 pluses,so for 3kv MVD, the input pluses are 3*6= 18 pluses.
The formula is :Input pluses=6*N, the N is each phase power cell numbers.

Q
What standards can GD5000 voltage and current harmonics meet?
2022-08-24
A

Designed in comp;iance with the strictest requirements of IEEE 519 1992 voltage and current harmonic distortion standards.

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