1 voltage boost – Watson-Marlow MM420 User Manual

Page 170

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3 Functions

Issue 10/06

MICROMASTER 420 Operating Instructions

170

6SE6400-5AA00-0BP0

3.21.1.1 Voltage

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 3-35):

Table 3-35

Voltage boost

Parameter Voltage

boost

Explanation

P1310 Constant

voltage boost

The voltage boost is effective over the complete
frequency range whereby the value continually
decreases at high frequencies.

f

Linear V/f

OFF

ON

t

t

⏐f⏐

P1310 active

t

0

1

Validity range

Vmax

Vn

(P0304)

V

ConBoost,100

0

fn

(P0310)

f max

(P1082)

V

f

Boost,end

(P1316)

Boost

Ou

tpu

t v

olt

ag

e

actual V

No

rm

al

V/

f

(P

13

00

=

0

)

V

ConBoost,50

Boost voltage

\\erlf305a\Graphics_PLI\Images\p1310_linear_MM420.vsd

P1311

Voltage boost when
accelerating- / braking

The voltage boost is only effective when accelerating
or braking.

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