Siemens Sinamics G120 Series Parameter Manual page 181

p1752[0...2] Start-freq. speed adaption (VC with encoder) / Start-freq. (VC)
CU240S Access level: 3
CU240S DP
Quick comm. NO
CU240S DP-F
Can be changed: U, T
CU240S PN
Min
0.1 [Hz]
Description: Enters start frequency of the n-adaption in vector control with encoder (VC, hysteresis like P1755).
The feature of speed-adaptation is an essential function to correct the torque (i.e. slip) in VC-mode. However, at low
frequencies the activated n-adaptation may cause some troubles. Therefore, below the limit of P1752 * P1756 / 100
% this feature is switched off.
p1755[0...2] Start-freq. motor model (SLVC) / Start-freq. (SLVC)
Access level: 3
Quick comm. NO
Can be changed: U, T
Min
0.2 [Hz]
Description: Assigns in SLVC the frequency limit for switch over from closed-loop operation to open-loop operation and vice
versa.
Start frequency motor model is involved in following formulas:
f_cl = P1755 - switch over frequency to closed-loop control
f_ol = P1755 * (P1756 / 100 %) - activation frequency for P1759
f_ol/2 = 0.5 * P1755 * (P1756 / 100 %) - switch over frequency to open-loop control
For detailed information see "Function manual", Section "Vector Control without Speed Encoder".
Note:
The Factory setting depends on inverter power.
p1756[0...2] Hyst.-freq. motor model / Hyst. freq.
Access level: 3
Quick comm. NO
Can be changed: U, T
Min
10.0 [%]
Description: Enters hysteresis for open-/closed-loop control (SLVC) and activation/deactivation of speed adaption (VC).
Note: For detailed information see P1752 and P1755.
p1758[0...2] T(wait) transit to open-loop / T(wait) trans.->OL
Access level: 3
Quick comm. NO
Can be changed: U, T
Min
100 [ms]
Sets waiting time for change from closed-loop to open-loop control mode.
Description:
Note: Waiting time will be ignored if the the absolute value of RFG input and the output frequency are below the absolute
value 0.5 * P1755 * (P1756 / 100) simultaneously.
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
P-Group: Closed-loop control
Active: YES
Max
250.0 [Hz]
P-Group: Closed-loop control
Active: YES
Max
250.0 [Hz]
P-Group: Closed-loop control
Active: YES
Max
100.0 [%]
P-Group: Closed-loop control
Active: YES
Max
2000 [ms]
Parameters
List of Parameters
Data type: Floating Point
Data set: DDS
Factory setting
5.0 [Hz]
Data type: Floating Point
Data set: DDS
Factory setting
5.0 [Hz]
Data type: Floating Point
Data set: DDS
Factory setting
50.0 [%]
Data type: Unsigned16
Data set: DDS
Factory setting
1000 [ms]
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