Functions, monitoring, and protective functions
9.2 Drive functions
Inverter chassis units
384 Operating Instructions, 07/2016, A5E00331449A
Efficiency optimization
Description
The following can be achieved when optimizing efficiency using p1580:
● Lower motor losses in the partial load range
● Minimization of noise in the motor
Figure 9-3 Efficiency optimization
It only makes sense to activate this function if the dynamic response requirements of the
speed controller are low (e.g. pump and fan applications).
For p1580 = 100%, the flux in the motor under no-load operating conditions is reduced to
half of the setpoint (reference flux) (p1570/2). As soon as load is connected to the drive, the
setpoint (reference) flux increases linearly with the load and, reaching the setpoint set in
p1570 at approx. r0077 = r0331 x p1570.
In the field-weakening range, the final value is reduced by the actual degree of field
weakening. The smoothing time (p1582) should be set to approx. 100 to 200 ms. Flux
differentiation (see also p1401.1) is automatically deactivated internally following
magnetization.
Field weakening characteristic, Id setpoint (ASM, p0300 = 1)
Field weakening controller, flux controller for induction motor (p0300 = 1)
Current setpoints, torque-generating
r0331
Motor magnetizing current/short-circuit current (actual)
p1570
p1580
Flux setpoint smoothing time
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