Nicotra DDMP Series Operating Manual page 13

A typical problem related to the fan speed is the resistances selection.
Here in the following a simple procedure for calculating them.
1) Find the
Signal/Speed of figure 14.
&
2) Reminding that ./ 0 1/2
And that the analog
&
7
9
In figure 15 is shown the behavior of the analog voltage signal increasing the potentiometer value.
th
Rev. 2 – 10 November2015
Voltage
(Required)
!
( ) * +
!
'
"#$
Input Impedance =
200; ∙ 7
9
./ ∙ 20; 7
'
6
./ ∙ & ! 200;
6 '
Fig.15 – Effect of the potentiometer value on the analog signal
= V
for achieving the
Req
∙ 9.5& 0.5&
3 45 ./
6
Z
=
20kOhm
in
! 7
9
9
9
> ?200; ! &
∙ ./
'
2 ∙ &
'
13
Speed
using the diagram
(Desired)
7 7 % 2;<=2
8 9
9
@ 80; ∙ & ∙ ./
9
6 * ' 6