Siemens Sinamics G120 Series Parameter Manual page 163

p1340[0...2] Imax controller prop. gain / Imax ctrl prp gain
Access level: 3
Quick comm. NO
Can be changed: U, T
Min
0.000
Description: 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 parameters P1340 and P1341) and a voltage controller (see parameters 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 parameters 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 warnings will still
be generated, and the drive will trip in excessive overcurrent or overload conditions.
p1341[0...2] Imax controller integral time / Imax ctrl int time
Access level: 3
Quick comm. NO
Can be changed: U, T
Min
0.000 [s]
Description: 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
Note: See parameter P1340 for further information.
The Factory setting depends on inverter power.
r1343 CO: Imax controller freq. output / CO:Imax ctrl Foutp
Access level: 3
Unit: [Hz]
Description: Displays effective frequency limitation.
Dependency: If I_max controller not in operation, parameter normally shows max. frequency P1082.
r1344 CO: Imax controller volt. output / CO:Imax ctrl Voutp
Access level: 3
Unit: [V]
Description: Displays amount by which the I_max controller is reducing the inverter output voltage.
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
P-Group: Closed-loop control
Active: YES
Max
0.499
P-Group: Closed-loop control
Active: YES
Max
50.000 [s]
P-Group: Closed-loop control
P-Group: Closed-loop control
Parameters
List of Parameters
Data type: Floating Point
Data set: DDS
Factory setting
0.000
Data type: Floating Point
Data set: DDS
Factory setting
0.300 [s]
Data type: Floating Point
Data set: -
Data type: Floating Point
Data set: -
1-163