Siemens 420 manual 146

3 Functions Issue 07/04

Parameter	Voltage boost						Explanation
		V	Boost voltage						Validity range
		Vmax
		Vn						ON	t
		(P0304)	actual VBoost		e			OFF
					g
				a
				lt				 f
			v
			t	o
			u		/f
	V		tp	l			)
			u
		AccBoost,100	O	a		0
			rm 0
			o		=				t
				0
			N 3					P1311 active
			1
	VAccBoost,50		(P
								1	t
								0
		0	fBoost,end					f
							fn	fmax
			(P1316)				(P0310)	(P1082)
	\\erlf305a\Graphics_PLI\Images\p1311_MM420.vsd

P1312	Voltage boost when starting	The voltage boost is only effective when accelerating
		for the first time (standstill)

	V	Boost voltage									Validity range
	Vmax
	Vn							ON			t
	(P0304)	actual VBoost			e			OFF
					g
				a
				lt					f	
				o
			v
			t
		u			/f
V		tp		l			)
		u
	StartBoost,100	O		a		0
		rm			=						t
		o		0
		N		0
				3				P1312 active
			1
VStartBoost,50		(P
									1		t
									0
	0	fBoost,end						f
							fn	fmax
		(P1316)					(P0310)	(P1082)
\\erlf305a\Graphics_PLI\Images\p1312_MM420.vsd

NOTE

Especially at low frequencies, the motor temperature is additionally increased as a result of the voltage boost (the motor overheats) !

The voltage value at 0 Hz is determined from the product of rated motor current P0305, stator resistance P0350 and the appropriate parameters P1310 – P1312.

MICROMASTER 420	Operating Instructions
146	6SE6400-5AA00-0BP0