We are offering variable frequency drive. Specifications : rated voltage: 440v/three phase power range: 0.4kw-3.7 kw output frequency: 0-900hz features : automatic setting for acceleration/decelerating time control model v/f overload capacity: 60 with 150% of rated current, 105 with 180% of rated current automatic voltage regulation (avr) all -dimensional protection includes pid circuit control senseless vector control program and vector control of fan and water pump makes it more economical.