6 Commissioning

Issue 10/06

P1750 = ...

Control word of motor model

1

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

Start

 

Closed loop

p1755

 

 

Open loop

 

t

f

Zero crossing

 

Closed loop

p1755

 

 

Open loop

 

t

 

p1755

P1755 = ...

For most applications the setting of parameter p1750 = 0 gives the best result at low frequency.

Start-freq. motor model (SLVC)

5.0 Hz

Enter the start frequency of sensorless vector control (SLVC), thereby SLVC switches over from open-loop to closed-loop at that frequency.

 

 

Pre-

r0062

 

control

 

 

 

 

 

Speed

Frequency

controller

setpoint

 

 

 

 

 

p1452

 

p1470

p1472

 

 

 

Flux setpoint

 

 

 

closed loop

 

 

p1610

 

Torque limitation

. isq

.

p1750/p1755

open/closed

loop

isd

Current

controller

Act. output

voltage

p1611

Flux setpoint

open loop

 

+

 

Act. frequency

Slip

Observer model

closed loop

 

 

 

 

iu

 

Current

 

iv

measurement

 

iw

 

 

 

 

 

Act. angle

Act. output frequency

+

0

52

MICROMASTER 440

Operating Instructions (Compact)

Page 52
Image 52
Siemens 440 P1750 =, Control word of motor model, Operation directly after an on command, Zero crossing