Siemens Sinamics G120 Series Parameter Manual page 162

Parameters
List of Parameters
p1335[0...2] Slip compensation / Slip compensation
Access level: 2
Quick comm. NO
Can be changed: U, T
Min
0.0 [%]
Description: Dynamically adjusts output frequency of inverter 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 fre-
quency. 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 (see P1460 - gain speed control).
Notice: The applied value of the slip compensation (scaled by P1335) is limited by following equation:
f
Slip_comp_
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 / Slip limit
Access level: 2
Quick comm. NO
Can be changed: U, T
Min
0 [%]
Description: 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 / V/f slip freq.
Access level: 3
Unit: [%]
Description: Displays actual compensated motor slip as [%]
Dependency: Slip compensation (P1335) active.
p1338[0...2] Resonance damping gain V/f / Res.damp. gain V/f
Access level: 3
Quick comm. NO
Can be changed: U, T
Min
0.00
Description: Defines resonance damping gain for V/f.
The di/dt of the acitve current will be scaled by P1338. If di/dt increases the resonance damping circuit decreases
the inverter output frequency.
Note: The resonance circuit damps oscillations of the active current which frequently occur during no-load operation. 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).
1-162
P1336
= ⋅ r0330
max
100
P-Group: Closed-loop control
Active: YES
Max
600.0 [%]
P-Group: Closed-loop control
Active: YES
Max
600 [%]
P-Group: Closed-loop control
P-Group: Closed-loop control
Active: YES
Max
10.00
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
Data type: Floating Point
Data set: DDS
Factory setting
0.0 [%]
Data type: Unsigned16
Data set: DDS
Factory setting
250 [%]
Data type: Floating Point
Data set: -
Data type: Floating Point
Data set: DDS
Factory setting
0.00