ATV6000 with voltage drop 30%

[LHNPhuong]

Hi community, 

What is the behavior of ATV6000 if supply voltage drop up to -30% ? 

In ATV6000 Handbook we know that Drive is de-rated if voltage drop to -25%

However, some competitor provide in their specs that Drive can work with voltage drop -30% 

Please advise

Thanks

[Daniel_Mougin · Accepted solution]

Hello,

As the variable speed drives are not designed for a UPS function, they cannot be asked to maintain full load/full speed if the input power in not there or not at the needed level.

However, we have strategies to maintain some level of operation, and most of the competitors (to not say all) go the same way and don't maintain full power at the output.

Firstly, the control is always supplied through an UPS to keep itactive.

Then, for ATV6000, the activation of the "Voltage Dip" function allows to let the motor go freewheeling or slightly regenerating to maintain the energy of the DC bus capacitors to supply the powercells (inverter part) control. This avoids activating the USF fault (undervoltage on DC bus).
The control of the motor can be taken back if the electrical network recovers within a maximum of 30s (settable delay between 0 to 30s).
VSD will then perform a “catch on fly” and re-accelerate the motor to the reference speed according to selected acceleration ramp.