118 Program features
For derating, see chapter Technical data, section Switching frequency derating in 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, 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 the smallest available value, 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
Parameter 97.01 Switching frequency reference and 97.02 Minimum switching
frequency (page 324).
Rush control
In torque control, the motor could potentially rush if the load were suddenly lost. The
control program has a rush control function that decreases the torque reference
whenever the motor speed exceeds 30.11 Minimum speed or 30.12 Maximum speed.
The function is based on a PI controller. The program sets the proportional gain to
10.0 and integration time to 2.0 s.
Jogging
The jogging function s the use of a momentary switch to briefly rotate the motor. The
jogging function is typically used during servicing or commissioning to control the
machinery locally.
Motor speed
Time
Overspeed trip level
Overspeed trip level
31.30 Overspeed trip margin
0
31.30 Overspeed trip margin
30.12
30.11
Rush control active
ACS580 FW.book Page 118 Wednesday, September 21, 2016 9:48 PM
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