Siemens SINAMICS S120 Function Manual page 131

An increased stall power (p1402.6 = 1) provides an improvement for both synchronous and
induction motors in the following ranges:
● For induction motors, the stall power decreases with the speed (see "voltage limiting
Characteristics" in the figure below).
Figure 5-12
● For synchronous motors, the stall power represents a constant power limit (see "voltage
limiting power" in the figure below).
Figure 5-13 Synchronous motor: Power-torque characteristic
Using r1549[1], when braking from a high speed, the stall power setting can be recorded using
a trace. The following must be observed:
● If a ramp-function generator is active, this should be deactivated so that the power limit can
be reached.
● If the motor in the stall power range is braked along the set limits (p640, p1520, p1521,
p1531), and r1549[1] remains set at zero, then p0388 should be increased. If p0388 remains
set too low, then the maximum possible motor power at the stall power limit is not reached.
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Induction motor: Power-torque characteristic
5.11 Increased stall power at the voltage limit
Servo control
129