NORD Drivesystems BU0180 - Manual (Page 171)

9 Additional Information
BU 0180 GB-0914 Pre-series version 171
I
S
= Motor current vector (line current) I
SD
= Magnetizing current vector (magn. current) I
SQ
= Load current vector (load current)
No flux optimisation With flux optimisation
Motor under partial load Motor under full load
9.7 Energy Efficiency
NORD frequency inverters have a low power consumption and are therefore highly efficient. In addition, with
the aid of "Automatic flux optimisation" (Parameter (P219)) the inverter provides a possibility for increasing
the overall efficiency of the drive in certain applications (in particular applications with partial load).
According to the torque required, the magnetisation current through the frequency inverter or the motor
torque is reduced to the level which is required for the present drive power. The resulting reduction in power
consumption, as well as the optimisation of the cos
φ factor of the motor rating even in the partial load
range, contributes to creating optimum conditions both with regard to energy consumption and mains
characteristics.
A parameterisation which is different from the factory setting (Factory setting = 100%) is only permissible for
applications which do not require rapid torque changes. (For details, see Section 6.1.3 Parameter (P219))
WARNING!
This function is not suitable for lifting applications or applications with frequent, large changes
in load and parameter (P219) MUST be left in the factory setting (100%).