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SINUS/ISD
15P0082B8
USER MANUAL
6 - 27/82
6.4.1.16
FLUXING
This function block allows user
parameterisation of the conventional
(volts/hertz) fluxing strategy of the
inverter. This is achieved though two
flexible volts to frequency templates.
Starting torque performance can also
be tailored through the FIXED BOOST
and AUTO BOOST parameters.
MMI Menu Map
1
SETUP PARAMETERS
2
FUNCTION BLOCKS
3
MOTOR CONTROL
4
FLUXING
V/F SHAPE
V/F SCALE
BASE FREQUENCY
LIMIT FREQUENCY
FIXED BOOST
AUTO BOOST
FLUXING
FLUXING
LINEAR LAW – [104] V/F SHAPE
––
100.00
%
–– [105] V/F SCALE
––
* 50.0 Hz –– [106] BASE FREQUENCY ––
120 Hz –– [113] LIMIT FREQUENCY ––
4.00 % –– [107] FIXED BOOST
––
0.00 % –– [108] AUTO BOOST
––
Parameter Descriptions
V/F SHAPE
Range: Enumerated - see below
This parameter determines the type of volts to frequency template is used to flux the
motor. The choices of this parameter are:
Enumerated Value
:
V/F Shape
0 : LINEAR LAW
1 : FAN LAW
V/F SCALE
Range: 0.00 to 100.00 %
This parameter directly scales the voltage output of the volts to frequency template. This
scaling takes place before any boost or auto boost is added.
BASE FREQUENCY
Range: 7.5 to 480.0 Hz
This parameter determines the frequency at which maximum output volts is generated.
Below base frequency, the volts will vary with frequency as determined by the V/F
SHAPE parameter. Above base frequency, the volts will saturate at the maximum value.
Setting the BASE FREQUENCY parameter to a value greater than LIMIT FREQUENCY
parameter, results in the internal value of base frequency used for the volts to frequency
template being clamped at the set value of limit frequency.
LIMIT FREQUENCY
Range: Enumerated - see below
Sets the value of the maximum output frequency the Inverter is able to supply to the
motor. The choices of this parameter are:
Enumerated Value
:
Limit Frequency
0 : 120 Hz
1 : 240 Hz
2 : 480 Hz
FIXED BOOST
Range: 0.00 to 25.00 %
This parameter allows for no-load stator resistance voltage drop compensation. This
correctly fluxes the motor (under no-load conditions) at low output frequencies, thereby
increasing available motor torque. Fixed boost can be set in addition to auto boost.
AUTO BOOST
Range: 0.00 to 25.00 %
This parameter allows for load dependent stator resistance voltage drop compensation.
This correctly fluxes the motor (under load conditions) at low output frequencies, thereby
increasing available motor torque. Auto boost can be set in addition to fixed boost.
The value of the AUTO BOOST parameter determines level of additional volts supplied
to the motor for 100% load.
Setting the value of auto boost too high can cause the Inverter to enter current limit. If
this occurs, the Inverter will be unable to ramp up in speed. Reducing the value of auto
boost will eliminate this problem.
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