AFNZPxxx– DUALACE2 NEW GENERATION – User Manual Page 41/169
The standard connection for the potentiometer is that on the left side of next
figure: potentiometer at rest on one end, in combination with a couple of travel-
demand switches. On request it is also possible to have the configuration on the
right side of next figure: potentiometer at rest in the middle, still in combination
with a couple of travel-demand switches.
Potentiometer configuration.
The negative supply of the potentiometer is to be taken from one of NENC pins;
A21 (A15) and A15 (A9).
Potentiometer resistance value should be in the 0.5 – 10 k range; generally, the
load should be in the 1.5 mA to 30 mA range.
A procedure for automatic acquisition of potentiometers signals can be carried
out using the console (see paragraphs 9.1, 9.2 and 9.3).
Analog inputs may also be used as extra digital inputs. In this case ADC value
should be used as the indicator of the input status. For example, a proximity
switch supplied from +B could be connected to an analog input.
Protection
Analog inputs are protected against short circuits to +B and -B. Each one has a
10 nF capacitor to -B for ESD protection.
Connector position
Standard Premium
A3, A10 A5, A14, A16, A22, A34, A35
If an analog input is used as a speed reference to the motor controller, a
system safety strategy must be defined.
The application software must take care of analog input errors such as
VACC OUT OF RANGE or VACC NOT OK.
4.4.4 Encoder input
Inputs for motor-speed feedback (encoder signals) have an internal 1 kΩ pull-up
for open collector sensor output. Threshold levels are listed below.
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