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Programming Your Application
690+ Series Frequency Inverter
Functional Description
V/F Shape
The function block allows the user to parameterise the Inverter’s conventional V/F motor
fluxing scheme. Three V/F shapes are available, LINEAR LAW, FAN LAW and USER
DEFINED:
•
Linear Law V/F shape should be used in applications requiring constant motor torque
though out the speed range (e.g. machine tools or hoists).
•
Fan Law V/F shape provides extra energy savings for fan or pump applications.
•
User Defined V/F shape provides a method for the user to define any profile. 10 user
defineable (x,y) points are provided. Liner interpolation is used between each point. The
drive also assumes the following points - (0%,0%) and (100%,100%) - though these may be
overridden. For example, (USER FREQ 1 = 0%, USER VOLTAGE 1 = 5%) takes
precedence over (0%, 0%).
For any of these V/F shapes the BASE FREQUENCY parameter (in the MOTOR DATA
function block) which is the value of Inverter output frequency at which maximum output volts
is provided, can be set by the user.
Boost Parameters
•
Correct no-load motor fluxing at low Inverter output frequencies can be achieved by setting
the FIXED BOOST parameter.
•
Correct motor fluxing under load conditions is achieved by setting the AUTO BOOST
parameter. The motor is correctly fluxed when the FIELD FBK diagnostic in the
FEEDBACKS function block reads 100.0% .
•
Additional FIXED BOOST can be applied during acceleration by setting the ACCELERTN
BOOST parameter. This can be uesful for starting heavy/high stiction loads.
Saving Energy
An ENERGY SAVING mode is provided which, when enables under low load conditions in the
steady state, attempts to reduce the output voltage so that minimum energy is used.
LINEAR LAW
FAN LAW
LOAD FILTER
DEMANDED
DRIVE
MEASURED LOAD
V/F SHAPE
BASE FREQUENCY
AUTO BOOST
FIXED BOOST
BASE VOLTS
USER DEFINED
(x,y)
ACCELERTN BOOST
ENERGY SAVING
VOLTS
FREQUENCY