Slip Compensation - Siemens SINAMICS S120 Function Manual

U/f control (vector control)

5.2 Slip compensation

5.2 Slip compensation
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%).
Figure 5-5
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• r0330[0...n]
• p1334[0...n]
• p1335[0...n]
•
•
• p1336[0...n]
• r1337
260
Slip compensation
Rated motor slip
V/f control slip compensation starting frequency
Slip compensation scaling
The slip compensation is deactivated.
p1335 = 0.0%:
The slip is fully compensated.
p1335 = 100.0%:
Slip compensation limit value
Actual slip compensation
of induction motors is
set
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions