ETAS ES411.1, User Manual, Page: 23 / 92

ETAS Hardware Description
ES413.1 - User’s Guide 23
4.3.3 Maximum Input and Common-Mode Voltages
The maximum input voltage between two inputs and the maximum voltage
between an input and the case ground is 60 V DC/ 30 V AC. For an explanation
of the maximum input and common-mode voltages, see Fig. 4
- 4 on page 23
and the example.
All capacitors between the inputs (U
in+
and U
in-
) and case ground have the
same capacity. The maximum voltage between any input and case ground is
also 60 V DC/ 30 V AC.
Fig. 4 - 4 Maximum Input and Common-Mode Voltages
Example
For the given input voltages U
inx
, U
iny
, U
inz
and the common-mode voltage
U
CMxy
, the maximum allowed common-mode voltage U
CMyz
is to be calculated.
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
+
-
+
-
+
-
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