Siemens MICROMASTER 440 - Page 115

Issue 10/06 3 Functions
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
115
Control word of motor model
This parameter controls the operation of the sensorless vector control (SLVC) at very low
frequencies.
This therefore includes the following conditions:
Bit00 Start SLVC open loop 0 NO 1 YES
(Operation directly after an ON command)
Bit01 Zero crossing SLVC open loop 0 NO 1 YES
(zero crossing)
f
t
p1755
Closed loop
Open loop
Start
f
t
Closed loop
Open loop
Zero crossing
p1755
p1755
For most applications the setting of parameter p1750 = 0 gives the best result at low
frequency.
Start-freq. motor model (SLVC)
Enter the start frequency of sensorless vector control (SLVC), thereby SLVC switches over
from open-loop to closed-loop at that frequency.
.
.
r0062
Speed
controller
Pre-
control
Torque
limitation
Current
controller
i
sq
−
open/closed
loop
Flux setpoint
closed loop
Flux setpoint
open loop
i
sd
p1610
p1611
−
+
+
0
Act. output
voltage
Act. output
frequency
Act. frequency
Current
measurement
Act. angle
Observer model
closed loop
Slip
Frequency
setpoint
i
u
i
w
i
v
p1452
p1470 p1472
p1750/p1755
p1750 = ...
p1755 = ...
1
5.0 Hz