6.2.7.3 Software filter
Averaging over two measured values can be activated for interference suppression
with bit 11 of ds04 current mode. This function can be reasonable especially at 4
kHz switching frequency, if the motor has a high current ripple due to its low induct-
ance.
Averaging over two measured values on / off
The software filter is always activated internally at switching frequencies higher
than 4 kHz. ds04 bit 11 has only influence at lower switching frequencies.
6.2.7.4 Decoupling
The decoupling is important for dynamic behaviour of the current control at fast
speed or current changes.
For good results it must be ensured that the equivalent circuit data are correct for
the connected motor (e.g. by identification).
Normally it can be calculated with the default value "1 decoupling on“ in ds04 cur-
rent mode.
Only for special applications
Only current decoupling, no speed-dependent pre-
control of the voltage
Only speed-dependent precontrol of the voltage
Only for special applications
decoup and compl
precontrol
Decoupling on
additionally a speed and current-dependent torque
limit is calculated, which is effective as absolute upper
limit
Especially for operation without encoder, the (estimated) speed can be noisy, so
the decoupling provides too many disturbances.
In this case, the frequency/speed can also be smoothed.
omega mech precontrol time
Filter time for the precontrol.
The default value for this function is 2 ms. For
high dynamic processes, when the speed must
be changed in a ms range, this value can be too
high. In these applications it is recommended to
set the time to zero.
Filter time for the decoupling.
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