52 Actual signals and parameters
26 MOTOR
CONTROL
Motor control variables
2605 U/F RATIO Selects the voltage to frequency (U/f) ratio below the
field weakening point. For scalar control only.
SQUARED
LINEAR Linear ratio for constant torque applications. 1
SQUARED Squared ratio for centrifugal pump and fan
applications. With squared U/f ratio the noise level is
lower for most operating frequencies.
Note: This parameter value is not recommended for
permanent magnet synchronous motors.
2
USER
DEFINED
Custom ratio defined by parameters 2610…2618. See
section Custom U/f ratio in ACS355 User’s manual
(3AUA0000066143 [English]).
3
2609 NOISE
SMOOTHING
Enables the noise smoothing function. Noise
smoothing distributes the acoustic motor noise over a
range of frequencies instead of a single tonal
frequency resulting in lower peak noise intensity. A
random component with an average of 0 Hz is added
to the switching frequency set by parameter 2606
SWITCHING FREQ. See ACS355 User’s manual
(3AUA0000066143 [English])
Note: Parameter has no effect if parameter 2606
SWITCHING FREQ is set to 16 kHz.
ENABLE
DISABLE Disabled 0
ENABLE Enabled 1
2619 DC
STABILIZER
Enables or disables the DC voltage stabilizer. The DC
stabilizer is used to prevent possible voltage
oscillations in the drive DC bus caused by motor load
or weak supply network. In case of voltage variation,
the drive tunes the frequency reference to stabilize the
DC bus voltage and therefore the load torque
oscillation.
ENABLE
DISABLE Disabled 0
ENABLE Enabled 1
All parameters
No. Name/
Value
Description Def/ FbEq
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