NORD Drivesystems BU0505 - Manual (Page 176)

SK 54xE – Users Manual for Frequency Inverters
176 BU 0505 GB-1013
I
S
= Motor current vector (line current) I
SD
= Magnetisation current (Magn. current) I
SQ
= Load current vector (Load
No flux optimisation With flux optimisation
Motor under partial load Motor under full load
8.7 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 frequency 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 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 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 parameter
(P219))
Fig. 18 Energy efficiency due to automatic flux optimisation
WARNING Overload
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%). If this is not complied with, there is a danger that
the motor will break down if a sudden peak load occurs.
Pos : 457 /Anleit ungen/8. / 9. Zusatzinfor mationen [BU 0500 / BU 0200]/ 8. 8 N or mierung Soll- / Ist wert e [ BU 0500] @ 0\ mod_1328189360846_388. doc x @ 14466 @ 2 @ 1