Slip Compensation - Siemens SINAMICS S120 Function Manual

U/f control (vector control)

7.3 Slip compensation

7.3 Slip compensation
Function description
The slip compensation ensures that the motor setpoint speed n
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 %).
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● r0330[0...n]
● p1334[0...n]
● p1335[0...n]
● p1336[0...n]
● r1337
● p1351[0...n]
300
Rated motor slip
U/f control slip compensation starting frequency
Slip compensation scaling
p1335 = 0.0 % The slip compensation is deactivated.
p1335 = 100.0 The slip is fully compensated.
%:
Slip compensation limit value
CO: Actual slip compensation
CO: Motor holding brake start frequency
of induction motors is
set
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions