ETAS
Analog Input Channels ("AI 1-4"/"AI 5-8" Connections)
ES930.1
-
User Guide
48
Fig.
6
-
3
Maximum input and Common Mode Voltages
6.4.2
Example
The input voltages U
inx
, U
iny
, U
inz
and the common mode voltage U
CMxy
are pre
-
defined. The maximum permissible common mode voltage U
CMyz
is to be cal
-
culated.
U
inx
= 10 V
U
iny
= 5 V
U
inz
= 10 V
U
CMxy
= 15 V
max (U
inx
+ U
iny
+ U
inz
+ U
CMxy
+ U
CMyz
) = 60 V
10 V + 5 V + 10 V + 15 V + max (U
CMyz
) = 60 V
max (U
CMyz
) = 60 V - 40 V = 20 V
6.5
Electrical Isolation
The analog input channels are electrically isolated from each other. Each ana
-
log input channel is electrically isolated from the supply voltage and from the
housing of the module.
+
-
+
-
+
-
Kanal x
Kanal y
Kanal z
Galvanische Trennung
Galvanische Trennung
Gehäusemasse
C
C
C
C
C
C
U
in+
U
in+
U
in+
U
in-
U
in-
U
in-
U
inx
U
iny
U
inz
U
CMxy
U
CMyz
U
c
U
c