Efficiency Optimization - Siemens SINAMICS G150 Operating Instructions Manual

Converter cabinet units 75 kw to 1500 kw

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Efficiency optimization

The following can be achieved when optimizing efficiency using p1580:

● Lower motor losses in the partial load range

● Minimization of noise in the motor

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.

Function diagram

Converter cabinet units

Operating Instructions, 03/2012, A5E03263466A

Efficiency optimization

Field weakening characteristic, Id setpoint (ASM, p0300 = 1)

Field weakening controller, flux controller for induction motor (p0300 = 1)

Current setpoints, torque-generating

Motor magnetizing current/short-circuit current (actual)

Flux setpoint

Efficiency optimization

Functions, Monitoring, and Protective Functions

9.2 Drive Functions