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FAQs Library
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.

Q
Does GD5000 support the unit bypass function? What are the bypass methods?
2022-08-24
A

Support unit bypass.There are manual bypass, automatic bypass and neutral point drifting bypass.

Q
What is the rated output voltage of the GD5000 power unit?
2022-08-24
A

The rated voltage of the power unit is 690VAC.

Q
What is the heat dissipation (cooling) method of GD5000?
2022-08-24
A

Forced air cooling.

Q
What is the carrier frequency range of GD5000?
2022-08-24
A

The carrier frequency range of GD5000 is 0.8KHZ-1.2KHZ.

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