Programming
Page
D-54
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
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A
B
C
D
E
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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
f
B
f
B
QUADRATIC LAW
CONSTANT
TORQUE
RANGE
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