Siemens 440 P1750 =, Control word of motor model, Operation directly after an on command

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)