Flux Optimisation; Settings; Acceleration And Deceleration Ramps; Critical Speeds - ABB ACS350 User Manual

110

Flux Optimisation

Flux Optimisation reduces the total energy consumption and motor noise level when
the drive operates below the nominal load. The total efficiency (motor and the drive)
can be improved by 1% to 10%, depending on the load torque and speed.

Settings

Parameter

Acceleration and deceleration ramps

Two user-selectable acceleration and deceleration
ramps are available. It is possible to adjust the
acceleration/deceleration times and the ramp
shape. Switching between the two ramps can be
controlled via a digital input or fieldbus.
The available ramp shape alternatives are Linear
and S-curve.
Linear: Suitable for drives requiring steady or slow
acceleration/deceleration.
S-curve: Ideal for conveyors carrying fragile loads, or other applications where a
smooth transition is required when changing the speed.
Settings
Parameter group
Sequence programming offers eight additional ramp times. See section
programming

Critical Speeds

A Critical Speeds function is available for applications where it is necessary to avoid
certain motor speeds or speed bands because of e.g. mechanical resonance
problems. The user can define three critical speeds or speed bands.
Settings
Parameter group
Program features
2601 FLUX OPT ENABLE
22 ACCEL/DECEL
on page 133.
25 CRITICAL SPEEDS
speed
Motor
Linear
Sequence
S-curve
t (s)
2