Boxi II – Manual
4.5
Position Input
connection guarantees that no shortcut can occur even if both relays are en-
gaged at the same time in the case of Boxi malfunction.
Make sure that relays can handle enough current for motor operation
under full load.
-
PTT
1
+
7
8
9
10
11
12
1
2
3
4
5
6
V
REF
+
+
+
+
-
-
-
-
PTT
2
IN
1
IN
2
TRIM
2
TRIM
1
MO
TOR
INPUT
RADIO
M
GND
R1
R2
VCC
Figure 8:
Connection of external relay for driving high current motor.
4.5
Position Input
The Boxi II includes also two analog inputs for position sensors. Most of the
position sensors are simply variable resistors - potentiometers, which work as
a voltage divider. The voltage divider must be connected to a voltage source
which we will refer to as a reference voltage. Boxi is able to handle different
types of connections which will be described in this section.
The connection used must be selected in a way that simplifies the installation.
Please note that Input 1 and Input 2 can be configured in a different way,
however not every possible combination is possible. The reason for this is that
only one
V
ref
input is present.
4.5.1
Internal Reference
This is simplest way of connecting the position sensor to the Boxi. The installer
shall connect three wires from position sensor directly to the Boxi. Please refer
16
©
Kanardia
2006-2021
Summary of Contents for Boxi II
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