Nix Product Manual |
Wiring and Connections
INGENIA | 01/22/2019
83
DC tachometer
The Nix Servo Drive can use a DC tachometer for velocity feedback through the I/O connector. a DC tachometer
provides an analog signal whose voltage level is proportional to the rotor speed.
Next figure illustrates how to connect a DC tachometer with differential output to the Nix Servo Drive.
Recommended potentiometer resistance
Potentiometers with high values of resistance (> 10 kΩ) can result in non linear behavior due to its the
drive parallel input resistors. High resistance values also reduce the signal to noise ratio, making it easier
to have disturbances and reducing the quality of the measure.
However, a very small value of resistance may also consume too much power and cause self heating
(which causes additional variations on resistance).
Therefore,
use the smallest value of resistance
that:
•
Does not exceed 1/2 of the potentiometer power rating (to allow safety margin and prevent self
heating).
•
Does not exceed the +5V_OUT current capacity.
Typically 1 kΩ to 10 kΩ will be preferred.
