Siemens 440 - Manual (Page 127)

Issue 01/06 Parameter Description
MICROMASTER 440 Parameter List
6SE6400-5BB00-0BP0
127
P1080[3] Min. frequency Min: 0.00
CStat: CUT Datatype: Float Unit: Hz Def: 0.00
P-Group: SETPOINT Active: Immediately QuickComm.: Yes Max: 650.00
Sets minimum motor frequency [Hz] at which motor will run irrespective of frequency setpoint.
The minimum frequency P1080 represents a masking frequency of 0 Hz for all frequency target value
sources (e.g. ADC, MOP, FF, USS), with the exception of the JOG target value source (analogous to
P1091). Thus the frequency band +/- P1080 is run through in optimum time by means of the
acceleration/deceleration ramps. Dwelling in the frequency band is not possible (see example).
Furthermore, an undershoot of the actual frequency f_act below min. frequency P1080 is output by the
following signal function.
Index:
P1080[0] : 1st. Drive data set (DDS)
P1080[1] : 2nd. Drive data set (DDS)
P1080[2] : 3rd. Drive data set (DDS)
Example:
0 t
1
t
r0053
Bit 02
|f_act| > f_min
P1080
-P1080 - P2150
P1080 + P2150
-P1080
t
P1080
-P1080
0 t
1
ON/OFF
P2153 = 0
f_set
f_act
Note:
Value set here is valid both for clockwise and for anticlockwise rotation.
Under certain conditions (e.g. ramping, current limiting), motor can run below minimum frequency.
Level
1