Siemens 440 User Manual

 

MICROMASTER 440 

54 

Operating Instructions (Compact) 

¾

  In the vector mode – with / without encoder – the speed controller can be 

subordinate to a constant or variable supplementary torque. 

¾

  The supplementary setpoint can be used to advantage for hoisting gear with low 

intrinsic friction when starting in the vertical direction. The supplementary torque 
setpoint must always be impressed in the hoisting (raising) direction (please 
observe the sign!). As a result of the supplementary torque, also when lowering, 
a slip is immediately established that has a stabilizing effect on the closed-loop 
control (there is no significant load sag). 

¾

  The sign of the supplementary torque setpoint can be determined as follows in 

the commissioning phase with the appropriate care and taking into account all 
of the relevant safety regulations: 
Hoist (raise) a minimum load using the hoisting gear and read-out the sign from 
parameter r0079 (the sign of r0079 corresponds to the sign of the 
supplementary torque setpoint). 

¾

  An empirical value of approx. 40 % of the rated motor torque r0333 has lead to 

good results for existing hoisting gear  
(carefully observe the sign!). 

 

CI: Supplementary torque setpoint 
Selects the source of the supplementary torque 
setpoint. 

 Frequent settings: 
 2889       Fixed setpoint 1 as a %  
 2890       Fixed setpoint 2 as a % 
 755.0      Analog input 1   
 755.1      Analog input 2   
 2015. 2   USS (BOP link)  
 2018. 2   USS (COM link) 
 2050. 2   CB (e.g. PROFIBUS) 

 

–

Torque

setpoint

Droop

Act. frequency

–

r1538

r1538

r1539

r1539

CI: Add. trq. setp

(0:0)

P1511.C

Pre-

control

Freq. setpoint

PI

Speed

controller

SLVC:
VC:

P1452
P1442

P1470
P1460

P1472
P1462

T

i

K

p

T

n

T

i

K

p

T

n

*)

*)  only active, if pre-control is enabled
     (P1496 > 0)

r0079

r1508

r0063

r1170

r1515

r1518

 

 

P1511=... 

0:0