
68 Program features
Events: -
Energy optimization
The Energy optimization function optimizes the motor flux so that total energy
consumption and motor noise level are reduced when the drive operates below the
nominal load. The total efficiency (motor and drive) can be improved by 1…20%
depending on load torque and speed.
Note:
With a permanent magnet motor, energy optimization is always enabled.
Settings and diagnostics
(page
).
Events: -
Switching frequency
The drive has two switching frequencies: reference switching frequency and
minimum switching frequency. The drive tries to keep the highest allowed switching
frequency (= reference switching frequency) if thermally possible, and then adjusts
dynamically between the reference and minimum switching frequencies depending
on the drive temperature. When the drive reaches the minimum switching frequency
(= lowest allowed switching frequency), it starts to limit output current as the heating
up continues.
For derating, see the hardware manual of the drive.
Example 1:
If you need to fix the switching frequency to a certain value as with some
external filters, e.g. with EMC C1 filters (see the hardware manual), set both the
reference and the minimum switching frequency to this value and the drive will retain
this switching frequency.
Example 2:
If the reference switching frequency is set to 12 kHz and the minimum
switching frequency is set to 1.5 kHz (or 1 kHz), the drive maintains the highest
possible switching frequency to reduce motor noise and only when the drive heats it
will decrease the switching frequency. This is useful, for example, in applications
where low noise is necessary but higher noise can be tolerated when the full output
current is needed.
Settings and diagnostics
Parameters
(page
) and
(page
).
Events: -
ACS180 FW.book Page 68 Tuesday, March 9, 2021 2:25 PM