Siemens SINAMICS V20 Operating Instructions Manual page 221

Parameter Function
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).
P1340[0...2] Imax controller propor-
tional gain
Proportional gain of the I_max controller.
The Imax controller reduces inverter current if the output current exceeds the maximum motor current
(r0067).
In linear V/f, parabolic V/f, FCC, and programmable V/f modes the I_max controller uses both a frequency
controller (see P1340 and P1341) and a voltage controller (see P1345 and P1346).
The frequency controller seeks to reduce current by limiting the inverter output frequency (to a minimum of
the two times nominal slip frequency).
If this action does not successfully remove the overcurrent condition, the inverter output voltage is reduced
using the I_max voltage controller.
When the overcurrent condition has been removed successfully, frequency limiting is removed using the
ramp-up time set in P1120.
In linear V/f for textiles, FCC for textiles, or external V/f modes only the I_max voltage controller is used to
reduce current (see P1345 and P1346).
Note: The I_max controller can be disabled by setting the frequency controller integral time P1341 to zero. This
disables both the frequency and voltage controllers.
Note that when disabled, the I_max controller will take no action to reduce current but overcurrent warn-
ings will still be generated, and the inverter will trip in excessive overcurrent or overload conditions.
P1341[0...2] Imax controller integral
time [s]
Integral time constant of the I_max controller.
P1341 = 0: I_max controller disabled
•
P1340 = 0 and P1341 > 0: frequency controller enhanced integral
•
P1340 > 0 and P1341 > 0: frequency controller normal PI control
•
Dependency: This parameter is influenced by automatic calculations defined by P0340.
Note: See P1340 for further information. The Factory setting depends on inverter power.
SINAMICS V20 Inverter
Operating Instructions, 09/2014, A5E34559884
Range Factory Can be
default changed
0 - 600 250 U, T
- - -
0.00 - 10.00 0.00 U, T
0.000 - 0.030 U, T
0.499
0.000 - 0.300 U, T
50.000
Parameter list
7.2 Parameter list
Scaling Data Data
set type
- DDS U16
PERCEN - Float
T
- DDS Float
- DDS Float
- DDS Float
Acc.
Level
2
3
3
3
3
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