SSD 605C Product Manual - page 95
Programming Your Application
6-29
605C Frequency Inverter
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