Program features 141
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
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
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
Sequence programming offers eight additional ramp times. See section
.
Linear
S-curve
Motor speed
t
(s)
2
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...