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FAQs Library
Q
Generally, the VFD supports 4-20mA analog. Why does the INVT medium Voltage VFD support 0-20mA analog ?
2022-08-24
A

Because INVT MVD support voltage (0-10V) and current (0-20mA) two type analog sources. Those two analog sources share one circuit, that is 0V=0mA and 10V=20mA, so INVT MVD current analog range is 0-20mA.

Q
What is the maximum distance between the motor and the MVD cable supported by the MVD without output reactor?
2022-08-24
A

The maximum distance between the motor and the MVD cable 2km without ouput reactor;
If MVD with output reactor or sine-wave filter can support maximum 5km.

Q
How to configure edium voltage VFD (MVD) indoor air conditioning ?(Not include cooling windows and doors)
2022-08-24
A

Firstly calculate the MVD poss loss;
Secondly 1HP can cooling 2.5kw power. 1HP=12000btu; 1btu=0.252kcal;
Finally can calculate the air conditioning power. Above data is rough design of reference data, the actual data please contact with INVT technical support engineer.

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.

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