Parameter Settings Before Use; 95.04 Ex/Sin Request; 26.03 Ir Compensation; 26.04 Ir Step-Up Freq - ABB ACS800 User Manual

Parameter settings before use

The following drive parameter settings should be made before starting up a step-up
drive system.

95.04 EX/SIN REQUEST

Set the parameter to SIN or EX&SIN. For more information, see the Firmware
Manual of the drive.

26.03 IR COMPENSATION

26.04 IR STEP-UP FREQ

Voltage boosting is used in step-up applications to achieve a higher starting torque.
The demand for a high starting torque affects the transformer design because
boosting the voltage at low frequencies increases transformer flux. The voltage
boost compensates resistive losses in the cables, step-up transformer, and motor.
Since voltage cannot be fed to the transformer at 0 Hz, special IR compensation is
used in step-up applications. Full IR compensation starts around slip frequency.
The voltage boost is set using parameters 26.03 IR COMPENSATION and 26.04 IR
STEP-UP FREQ.
COMPENSATION]
U / U
N
(%)
100%
[26.03 IR
[26.04 IR STEP-
UP FREQ]
Field weakening
point (FWP)
Appendix – Step-up applications
39
f (Hz)