Reactive Current Control; Harmonics Controller - Siemens SINAMICS S120 Function Manual

1.1.4

Reactive current control

A reactive current setpoint can be set to compensate the reactive current or to sta-
bilize the line voltage in infeed mode. The total setpoint is the sum of the fixed set-
point (p3610) and the dynamic setpoint via binector input p3611.
Note
The direction of rotation of the network is compensated automatically with reactive
current control. A negative reactive current setpoint causes an inductive reactive
current; a positive setpoint generates a capacitive reactive current.
Note
The closed-loop control limits the reactive current setpoint dynamically in such a
way that the sum of the active current setpoint and the reactive current setpoint
does not exceed the maximum device current.
Note
The reactive current consumption of the line filter selected in the configuration
Wizard is automatically covered by the Active Infeed closed-loop control. This
means that the display value of the current reactive current setpoint in 0075 no
longer corresponds with the parameterized total reactive current setpoint.
Note
The reactive power setpoint of the Line Module with respect to the network can be
derived by multiplying the parameterized total reactive current setpoint by 1.73 *
rated line voltage.
1.1.5

Harmonics controller

Description
Harmonics in the line voltage cause harmonics in the line currents. By activating
the harmonics controller, you can reduce current harmonics.
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition
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Active infeed
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