Siemens Sinamics G120 Series - p1752[0...2] Start-freq. speed adaption (VC with encoder); Start-freq. (VC); p1755[0...2] Start-freq. motor model (SLVC); Start-freq. (SLVC); p1756[0...2] Hyst.-freq. motor model; Hyst. freq.; p1758[0...2] T(wait) transit to open-loop; T(wait) trans.->OL

List of Parameters
Parameters
1-181
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
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.
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
Note: For detailed information see "Function manual", Section "Vector Control without Speed Encoder".
The Factory setting depends on inverter power.
Description: Enters hysteresis for open-/closed-loop control (SLVC) and activation/deactivation of speed adaption (VC).
Note: For detailed information see P1752 and P1755.
Description: Sets waiting time for change from closed-loop to open-loop control mode.
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.
p1752[0...2] Start-freq. speed adaption (VC with encoder) / Start-freq. (VC)
CU240S
CU240S DP
CU240S DP-F
CU240S PN
Access level: 3 P-Group: Closed-loop control Data type: Floating Point
Quick comm. NO Active: YES Data set: DDS
Can be changed: U, T
Min Max Factory setting
0.1 [Hz] 250.0 [Hz] 5.0 [Hz]
p1755[0...2] Start-freq. motor model (SLVC) / Start-freq. (SLVC)
Access level: 3 P-Group: Closed-loop control Data type: Floating Point
Quick comm. NO Active: YES Data set: DDS
Can be changed: U, T
Min Max Factory setting
0.2 [Hz] 250.0 [Hz] 5.0 [Hz]
p1756[0...2] Hyst.-freq. motor model / Hyst. freq.
Access level: 3 P-Group: Closed-loop control Data type: Floating Point
Quick comm. NO Active: YES Data set: DDS
Can be changed: U, T
Min Max Factory setting
10.0 [%] 100.0 [%] 50.0 [%]
p1758[0...2] T(wait) transit to open-loop / T(wait) trans.->OL
Access level: 3 P-Group: Closed-loop control Data type: Unsigned16
Quick comm. NO Active: YES Data set: DDS
Can be changed: U, T
Min Max Factory setting
100 [ms] 2000 [ms] 1000 [ms]