Siemens SINAMICS G120D List Manual page 191

Dependency: p1335 > 0 %: Slip compensation active.
Refer to: p1335
p1338[0...n] U/f mode resonance damping gain / Uf Res_damp gain
Access level: 3
Can be changed: U, T
Units group: -
Min
0.00
Description: Sets the gain for resonance damping for U/f control.
Dependency: Refer to: p1300, p1339, p1349
Note: The resonance damping function dampens active current oscillations that frequency occur under no-load condi-
tions.
The resonance damping is active in a range from approximately 6 % of the rated motor frequency (p0310). The
shutoff frequency is determined by p1349.
For the open-loop control modes p1300 = 5 and 6 (textile sectors), the resonance damping is internally disabled in
order that the output frequency can be precisely set.
p1339[0...n] U/f mode resonance damping filter time constant / Uf Res_damp T
Access level: 4
Can be changed: U, T
Units group: -
Min
1.00 [ms]
Description: Sets the filter time constant for resonance damping for U/f control.
Dependency: Refer to: p1300, p1338, p1349
p1340[0...n] I_max frequency controller proportional gain / I_max_ctrl Kp
Access level: 3
Can be changed: U, T
Units group: -
Min
0.000
Description: Sets the proportional gain of the I_max frequency controller.
The I_max controller reduces the drive converter output current if the maximum current (r0067) is exceeded.
In the U/f operating modes (p1300) for the I_max control, one controller is used that acts on the output frequency
and one controller that acts on the output voltage. The frequency controller reduces the current by decreasing the
converter output frequency. The frequency is reduced down to a minimum value (equaling twice rated slip). If the
overcurrent condition cannot be successfully resolved using this measure, then the drive converter output voltage is
reduced using the I_max voltage controller. Once the overcurrent condition has been resolved, the drive is acceler-
ated along the ramp set in p1120 (ramp-up time).
Dependency: In the U/f modes (p1300) for textile applications and for external voltage setpoints, only the I_max voltage controller
is used.
Notice: When de-activating the I_max controller, the following must be carefully observed:
When the maximum current (r0067) is exceeded, the output current is no longer reduced, however, overcurrent
alarm messages are generated. The drive is shut down if the overcurrent limit (r0209) is exceeded.
Note: The I_max limiting controller becomes ineffective if the ramp-function generator is de-activated with p1122 = 1.
p1341 = 0: I_max frequency controller de-activated and I_max voltage controller activated over the complete speed
range.
© Siemens AG 2012 - 2013 All Rights Reserved
SINAMICS G120D List Manual (LH14), 01/2013
Calculated: p0340 = 1,3,4
Scaling: -
Unit selection: -
Max
100.00
Calculated: p0340 = 1,3,4
Scaling: -
Unit selection: -
Max
1000.00 [ms]
Calculated: p0340 = 1,3,4
Scaling: -
Unit selection: -
Max
0.500
Parameters
List of parameters
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: 1690, 6310
Factory setting
0.00
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: 6310
Factory setting
20.00 [ms]
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: 1690
Factory setting
0.000
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