Siemens SINAMICS S120 Function Manual page 139

Series reactor
When high-speed special motors are used, or other low leakage induction motors, a series
reactor may be required to ensure stable operation of the current controller.
The series reactor can be integrated via p0353.
Commissioning/optimization
1. Estimate the motor current p1612 on the basis of the mechanical conditions (I = M/kt).
2. Optimize K
3. Determine the load moment of inertia in the speed range above I/f operation (> p1755) by
Function diagrams (see SINAMICS S120/S150 List Manual)
• 5019
• 5050
• 5060
• 5210
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
(p1470) and T
n
inertia should be set to zero here (p1498 = 0), since this deactivates part of the torque
precontrol.
setting p1498 via a ramp response (e.g. ramp time 100 ms) and assessing the current
(r0077) and model speed (r0063).
Servo control - Speed control and V/f control, overview
Servo control - Speed controller adaptation (Kp_n-/Tn_n adaptation)
Servo control - Torque setpoint, switchover control mode
Servo control - Speed controller without encoder
4.12 Sensorless operation (without an encoder)
(p1472) above I/f operation (> p1755). The load moment of
n
Servo control
139