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Programming D-54

890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D

FLUXING

SETUP::MOTOR CONTROL::FLUXING

Designed for VOLTS/Hz motor Control Mode.

This function block allows user parameterisation of the conventional (volts/hertz) fluxing strategy of the Drive. This is

achieved though three flexible Volts-to-frequency templates. Starting torque performance can also be tailored through the

FIXED BOOST, ACCELRTN BOOST and AUTO BOOST parameters.

Parameter Descriptions

V/F SHAPE

PREF: 21.01

Default: 0

Range: See below

This parameter determines the type of volts to frequency template that is used to flux the motor. The choices for this parameter

are:

Enumerated Value

: V/F Shape

0 : LINEAR LAW This gives a constant flux characteristic up to the BASE FREQUENCY (see MOTOR

INDUCTION function block).

1 : FAN LAW This gives a quadratic flux characteristic up to the BASE FREQUENCY. This matches

the load requirement for fan and most pump applications

2 : USER DEFINED This gives a user defined flux characteristic up to the BASE FREQUENCY.

V/F SHAPE

LINEAR

FREQUENCY

= BASE FREQUENCY

100%

CONSTANT

POWER RANGE

(field weakening)

OUTPUT VOLTS

QUADRATIC LAW

CONSTANT

TORQUE

RANGE

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