Settings; Flux Optimization; Acceleration And Deceleration Ramps - ABB ACS355 User Manual

The drive monitors the motor status continuously, also during the Flux braking.
Therefore, Flux braking can be used both for stopping the motor and for changing the
speed. The other benefits of Flux braking are:
• The braking starts immediately after a stop command is given. The function does
not need to wait for the flux reduction before it can start the braking.
• The cooling of the motor is efficient. The stator current of the motor increases
during the Flux braking, not the rotor current. The stator cools much more
efficiently than the rotor.

Settings

Parameter 2602 FLUX BRAKING

Flux optimization

Flux optimization 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 2601 FLUX OPT ENABLE

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 through a digital input or
fieldbus.
The available ramp shape alternatives are
Linear and S-curve.
Linear shape is suitable for drives requiring
steady or slow acceleration/deceleration.
S-curve shape is ideal for conveyors carrying fragile loads, or other applications
where a smooth transition is required when changing the speed.
Settings
Parameter group 22 ACCEL/DECEL
Sequence programming offers eight additional ramp times. See section
programming on page 166.
Program features 139
Motor speed
Linear
S-curve
t (s)
2
Sequence