Commissioning the
7.6 Controller settings
F-TM ServoDrive
Equipment Manual, 02/2020, A5E47579503-AA
73
Note
If you manually set the controller parameters to inappropriate values, the drive system can
be damaged.
Make changes to the controller settings in small steps. Keep checking the b
ehavior of the
drive system until you have found a satisfactory setting.
7.6.2 Filters
Speed setpoint filter
The drive has a first-order time-delay element (low pass PT1) as a speed setpoint filter. The
filter time constant can be set with p1416.
The speed setpoint filter is able to attenuate harmonic components of the setpoint and thus
to reduce any overshooting of the controller.
The speed setpoint filter has no effect on the stability of the speed controller because it is in
the setpoint channel before the control loop. The dynamics of the response to setpoint
changes is reduced by smoothing.
As a rule, set the speed setpoint filter to a low value or zero, since the upstream ramp
generator ensures sufficient limitation of the setpoint signal.
Speed actual value filter
The drive has a first-order time-delay element (low pass PT1) as a speed actual value filter.
The filter time constant can be set via p1441.
The speed actual value filter smooths the actual value signal, preventing load fluctuations
from acting too directly on the controller.
7.6.3 OFF responses
OFF1 (Switch off)
By resetting bit 0 in STW1 (On), you activate OFF1 and the drive is braked to 0 in a speed-
controlled manner according to the ramp generator ramp-down (p1120, p1121). If the actual
speed falls below the value of the "Zero speed detection" (p1226) parameter, the pulses
become inhibited and the motor is in free-running state and coasts down.
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