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Can I use VSD ATV61 for a Screw blower of constant torque?

ATV61: is for Variable torque applications
Applications:
Range specifically for high performance pumps and fans for industrial and building markets.

ATV71: is for Constant torque Applications
Applications:
High performance applications:
  • Material handling
  • Hoisting
  • Wood-working machines
  • Process machinery
  • Textile machines
  • Packaging
  • ..etc

So, Regarding your Application (Screw blower) it is a constant torque application; Where the ATV71 range is highly recommended than the ATV61.
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