Custom U/F Ratio - ABB ACS355 series User Manual

Custom U/f ratio

The user can define a U/f curve (output voltage as a function of frequency). This
custom ratio is used only in special applications where linear and squared U/f ratio
are not sufficient (eg, when motor break-away torque needs to be boosted).
Voltage (V)
Par. 2618
Par. 2616
Par. 2614
Par. 2612
Par. 2610
Par. 2603
Note: The U/f curve can be used in scalar control only, ie, when
MODE setting is SCALAR:
Note: The voltage and the frequency points of the U/f curve must fulfill the following
requirements:
2610 < 2612 < 2614
2611 < 2613 < 2615
WARNING! High voltage at low frequencies may result in poor performance or
motor damage (overheating).

Settings
Parameter
2605
2610...2618

Diagnostics
Fault
PAR USER U/F
Par. 2611 Par. 2613
FREQ.
< 2616 < 2618 and
< 2617 < 9907
Additional information
Custom U/f ratio activation
Custom U/f ratio settings
Additional information
Incorrect U/f ratio
Custom U/f ratio
Par. 2615
Program features 143
Par. 2617 Par. 9907
9904 MOTOR CTRL
f (Hz)