Elettronica Santerno SINUS/ISD 200 S-0.75, User Manual, Page: 84 / 206

15P0082B8
USER MANUAL
SINUS/ISD
6 - 28/82
Functional Description
The function block allows the user to parameterise the inverter’s conventional V/F motor fluxing scheme. Two
V/F shapes are available, LINEAR LAW and FAN LAW:
•
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.
For either of these V/F shapes the BASE FREQUENCY, which is the value of inverter output frequency at which
maximum output volts is provided, can be set by the user.
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 diagnostic in the CURRENT FEEDBACK function block reads
100.0% .
LINEAR LAW
FAN LAW
LOAD FILTER
DEMANDED VOLTS INVERTER FREQUENCY
MEASURED LOAD
V/F SHAPE
BASE FREQUENCY
AUTO BOOST
FIXED BOOST
V/F SCALE BASE VOLTS