Siemens 420 manual Parameter Voltage boost Explanation

Issue 07/04 3 Functions

3.21.1.1Voltage boost

Parameter range:	P1310, P1311, P1312
	r0056 bit 05
Warnings	-
Faults	-
Function chart number:	FP6100

For low output frequencies, the V/f characteristics only output a low output voltage. Even at low frequencies, the ohmic resistances of the stator winding play a role, which are neglected when determining the motor flux in Section 3.21.1. This means that the output voltage can be too low in order to

implement the magnetization of an induction motor, to hold the load

to voltage drops (ohmic losses in the winding resistances) in the system or to provide a breakaway / accelerating / braking torque.

The output voltage can be increased (boosted) in MICROMASTER using the following parameters (refer to Table 3-28):

Table 3-28 Voltage boost

Parameter

Voltage boost

Explanation

P1310

Constant

The voltage boost is effective over the complete

voltage boost

frequency range whereby the value continually

decreases at high frequencies.

V

Linear V/f

Boost voltage

Vmax

Validity range

Vn

g

e

ON

lt

(P0304)

a

v

t

o

OFF

t

u

p

t

 f

O

u

VConBoost,100

actual VBoost

f

)

V

a

/

0

t

m

l

=

r

0

P1310 active

o

0

N

3

1

VConBoost,50

P

1

(

t

0

0

fBoost,end

fn

f max

f

(P1316)

(P0310)

(P1082)

\\erlf305a\Graphics_PLI\Images\p1310_linear_MM420.vsd

P1311	Voltage boost when	The voltage boost is only effective when accelerating
	accelerating- / braking	or braking.

MICROMASTER 420	Operating Instructions
6SE6400-5AA00-0BP0	145