KEB COMBIVERT F5, Reference Manual, Page: 223 / 349

223
LA - Analog I/O Parameters
Analog Input 1
Settings LA01-07 for Analog Input 1 (AnIn1) correspond to terminal inputs
AN1+ and AN1-.
The noise filter suppresses disturbances and ripples of the analog input
signals. If the noise filter is switched off the analog inputs are queried every
1 ms and the recorded value is then transferred. The noise filter adjustment
specifies the time over which the data samples are averaged. This parameter
is automatically adjusted when LC40 > 0.
Through capacitive as well as inductive coupling on the input lines or voltage
fluctuations of the signal source, the motor connected to the inverter can still
drift (tremble) during standstill in spite of the analog input filter. It is the task of
the dead band, or zero-point hysteresis, to suppress this. With this parameter
the respective analog signals can be faded out within a range of 0...±10%
(0…1V). The adjusted value is valid for positive and negative input signals.
If a negative percent value is adjusted the hysteresis acts in addition to the
zero point around the current setpoint. Setpoint changes are accepted only
if they are larger than the adjusted hysteresis.
-1V
1V
10%
-10%
Suppression
Range
Example of 10% Dead Band
6.13 LA - Analog I/O Parameters
i
LA01
Analog Input 1 Noise
Filter
LA04
Analog Input 1 Dead
Band