Issue 01/06

Parameter Description

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

Level

1

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:

ON/OFF

1

0

t

f_set

P1080

t

-P1080

 

f_act

 

P1080 + P2150

 

P1080

 

 

 

t

-P1080

 

-P1080 - P2150

 

f_act > f_min

 

r0053

1

P2153 = 0

Bit 02

0

t

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.

MICROMASTER 440

Parameter List

6SE6400-5BB00-0BP0

127

Page 127
Image 127
Siemens 440 manual P10803 Min. frequency, 127, Active Immediately QuickComm. Yes Max 650.00