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Are line chokes mandatory for ATV61 Drive?

Issue
Are line choke  for ATV61 Drive?

Product Line:  
ATV 61

Environment:  
All Models , All serial numbers

Resolution: 
Line chokes are mandatory:  
For ATV 61HU40M3…HU75M3 drives powered by a 200…240 V 50/60 Hz single phase supply voltage. 
For ATV 61HC11Y…HC80Y drives.
For ATV 61QC13Y…QC80Y drives.
Their use is recommended for ATV 61H ... S6X and ATV 61HU30Y…HD90Y drives. 

Line chokes can be used instead of a DC choke with ATV 61H ... M3 drives powered by a 200…240V 50/60 Hz three-phase supply voltage, and ATV 61H ... M3X and ATV 61 .... N4 drives.

Note: ATV 61HD90N4…HC63N4 drives, supplied as standard with a DC choke, can be ordered without a choke by adding the letter D at the end of the reference (see page 25 of "Variable speed drives Altivar 61 and Altivar 61 Plus Catalogue October 2011" ). Chokes must be installed upstream of the drive.  Applications The use of line chokes is recommended in particular under the following circumstances:  Close connection of several drives in parallel,  Line supply with significant disturbance from other equipment (interference, over-voltages) Line supply with voltage balance between phases that is more than 1.8% of the nominal voltage, Drive supplied by a line with very low impedance (in the vicinity of power transformers 10 times more powerful than the drive rating),  Installation of a large number of frequency inverters on the same line,  Reduction of overloads on the cos. capacitors, if the installation includes a power factor correction unit.

Refer to "Variable speed drives Altivar 61 and Altivar 61 Plus Catalogue October 2011" which can be found at www.schneider-electric.com   See Page 74 for Altivar 61:  Reduction of current harmonics using Line Chokes Presentation. Depending on the line supply, one of the main solutions for reducing current harmonics is the Line Choke.  A line choke can be used to provide improved protection against over-voltages on the line supply and to reduce harmonic distortion of the current produced by the drive. The recommended chokes limit the line current.  They have been developed in line with standard IEC 61800-5-1 (VDE 0160 level 1 high-energy over-voltages on the line supply).  The choke values are defined for a voltage drop between phases of between 3% and 5% of the nominal supply voltage. Values higher than this will cause loss of torque. 
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