Siemens 420 manual 27 V/f characteristic parameter P1300, Use / property

3 Functions Issue 07/04

U, M, P, Φ
	U, P
	Rated motor
Mn, Φ n	operating point
U, P	M, Φ
	f
Voltage control range	Field control range
fn	fmax

Fig. 3-61 Operating ranges and characteristics of an induction motor when fed from a drive inverter

There are several versions of the V/f characteristic as shown in Table 3-27.

Table 3-27 V/f characteristic (parameter P1300)

Parameter	Significance	Use / property
value
0	Linear	Standard case	V
	character-
	istic		Vn
				P1300 = 0
			0	f
				fn
1	FCC	Characteristic which compensates the voltage losses of the stator
		resistance for static (steady-state) or dynamic loads (flux current control
		FCC). This is especially used for small motors which have a relatively high
		stator resistance. Refer to Section 3.21.1.2.
2	Square-law	This is a characteristic which	V
	character- takes into consideration the
	istic	torque characteristic of the driven	Vn
		load (e.g. fan / pump)
		a) Square-law characteristic
		(f 2 characteristic)
		b) Energy saving as the lower
		voltage also results in lower
		currents and losses.		P1300 = 2
			0	f
3	Programm-	Characteristic which takes into		fn
			V
	able	consideration the torque
			Vmax
	character- characteristic of the motor /		r0071
			Vn
	istic	driven load (e.g. synchronous
			P0304	P1300 = 3
		motor).
			P1325
			P1323
			P1321
			P1310

						f
f0	f1	f2	f3	fn	fmax
0 Hz	P1320 P1322		P1324 P0310		P1082

MICROMASTER 420	Operating Instructions
144	6SE6400-5AA00-0BP0