Siemens SINAMICS S120 - Slip Compensation

V/f control (vector control)
6.3 Slip compensation
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
305
6.3
Slip compensation
The slip compensation ensures that the motor setpoint speed n
set
of induction motors is
essentially kept constant independent of the load. For a load step from M1 to M2, the
setpoint frequency should be automatically increased, so that the resulting frequency and
therefore the motor speed is kept constant. When the load decreases from M2 to M1, then
the setpoint frequency is automatically reduced.
If a motor holding brake is used, a setting value can be specified at the slip compensation
output via p1351. A parameter setting of p1351 > 0 automatically activates the slip
compensation (p1335 = 100%).
Figure 6-5 Slip compensation
Overview of important parameters (see SINAMICS S120/S150 List Manual)
•
r0330[0...n]
Rated motor slip
•
p1334[0...n]
V/f control slip compensation s
tarting frequency
•
p1335[0...n]
Slip compensation scaling
p1335 = 0.0 %
The slip compensation is deactivated.
p1335 = 100.0 %:
The slip is fully compensated.
•
p1336[0...n]
Slip compensation limit value
•
r1337
CO: Actual slip compensation
•
p1351[0...n]
CO: Motor holding brake start frequency