Siemens 440 manual P13353 Slip compensation, 162, Active Immediately QuickComm. No Max 600.0

Parameter Description Issue 01/06

3.29.1.1Slip compensation

P1335[3] Slip compensation				Min:	0.0
CStat:	CUT	Datatype: Float	Unit: %	Def:	0.0
P-Group:	CONTROL	Active: Immediately	QuickComm.: No	Max:	600.0

Level

2

Dynamically adjusts output frequency of inverter so that motor speed is kept constant independent of motor load.

In the V/f-control, the motor speed will always be less than the command speed due to the slip speed. For a given speed command, the speed will drop as load is increased. The speed regulation of drive can be improved by the technique known as slip compensation.

Increasing the load from M1 to M2 (see diagram) will decrease the motor speed from f1 to f2, due to the slip. The inverter can compensate for this by increasing the output frequency slightly as the load increases. The inverter measures the current and increases the output frequency to compensate for the expected slip.

Without slip compensation			With slip compensation
M			M
M2			M2
M1			M1
	∆ f	f	∆ f	f
	f2 f1		f2 f1	fout M2
				fout M1
Index:
P1335[0]	: 1st. Drive data set (DDS)
P1335[1]	: 2nd. Drive data set (DDS)
P1335[2]	: 3rd. Drive data set (DDS)
Value:
P1335 =	0 % :

Slip compensation disabled.

P1335 = 50 % - 70 % :

Full slip compensation at cold motor (partial load).

P1335 = 100 % :

Full slip compensation at warm motor (full load).

Range of slip compensation :

				f out
%				fN	with
					slip compensation
P1335					without
					slip compensation
			f out		f set
6 %	10 %	100 %	fN	6 % 10 %	fN

Notice:

The applied value of the slip compensation (scaled by P1335) is limited by following equation:

fSlip_act

r0065

fset

r1078

P1335

100

Setpoint channel

fSlip_comp_max P1335

fact

r0063

= P1336 ⋅

f Slip_comp_max 100 r0330

r1337

fout

162	MICROMASTER 440 Parameter List
	6SE6400-5BB00-0BP0