Siemens SINAMICS V20 Operating Instructions Manual page 257

Parameter Function
P1335[0...2] Slip compensation [%] 0.0 - 600.0
Parameter dynamically adjusts inverter output frequency so that motor speed is kept constant independent
of motor load.
In the V/f-control, the motor frequency will always be less than the inverter output frequency due to the slip
frequency. For a given output frequency, the motor frequency will drop as load is increased. This behavior,
typical for induction motors, can be compensated using slip compensation. P1335 can be used to enable
and fine-tune the slip compensation.
Dependency: Gain adjustment enables fine-tuning of the actual motor speed.
P1335 > 0, P1336 > 0, P1337 = 0 if P1300 = 5, 6.
Notice: The applied value of the slip compensation (scaled by P1335) is limited by following equation:
f_Slip_comp,max = r0330 * (P1336 / 100)
Note: P1335 = 0 %:
Slip compensation disabled.
P1335 = 50 % - 70 %:
Full slip compensation at cold motor (partial load).
P1335 = 100 % (standard setting for warm stator):
Full slip compensation at warm motor (full load).
P1336[0...2] Slip limit [%]
Compensation slip limit in [%] relative to r0330 (rated motor slip), which is added to frequency setpoint.
Dependency: Slip compensation (P1335) active.
r1337 CO: V/f slip frequency
[%]
Displays actual compensated motor slip as [%]. f_slip [Hz] = r1337 [%] * P0310 / 100
Dependency: Slip compensation (P1335) active.
P1338[0...2] Resonance damping
gain V/f
Defines resonance damping gain for V/f. The di / dt of the active current will be scaled by P1338. If di / dt
increases the resonance damping circuit decreases the inverter output frequency.
Dependency: This parameter is influenced by automatic calculations defined by P0340.
Note: The resonance circuit damps oscillations of the active current which frequently occur during no-load opera-
tion. In V/ f modes (see P1300), the resonance damping circuit is active in a range from approx. 6 % to
80 % of rated motor frequency (P0310). If the value of P1338 is too high, this will cause instability (forward
control effect).
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006
Range Factory
default
0.0
0 - 600 250
- -
0.00 - 10.00 0.00
Can be Scaling
changed
U, T PERCENT
U, T -
- PERCENT
U, T -
Parameter list
8.2 Parameter list
Data Data Acc.
set type Level
DDS Float 2
DDS U16 2
- Float 3
DDS Float 3
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