Speed Compensated Stop - ABB ACS280 Firmware Manual

54 Program features
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
97.01 Switching frequency reference
Parameters
switching frequency
Events: -

Speed compensated stop


Speed compensation stop is available for example for applications where a
conveyer needs to travel a certain distance after receiving the stop command.
At maximum speed, the motor is stopped normally along the defined
deceleration ramp, after the application of a user defined delay to adjust the
distance traveled. Below maximum speed, stop is delayed still more by running
the drive at current speed before the motor is ramped to a stop. As shown in
the figure, the distance traveled after the stop command is the same in both
cases, that is, area A + area B equals area C.
Motor speed
Stop command
Max.
speed
D1
Used
speed
280
(page ).
A B
D2
280
(page
D1 =Delay defined by parameter
D2 =Additional delay calculated by
speed compensated stop
Area A + Area B = Area C
C
t
(s)
97.02 Minimum
) and
21.31