Engineering Guide CDA3000
4-19
4 Software functions
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EN
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A
4.2.2 Isolation
method and
connection tips
The isolation in the inverter module safely isolates all control terminals
from the live circuit components. The reference potentials of the control
terminals are in turn split such that all analog and digital signals are each
connected to one reference potential (DGND and AGND). As a result of
this split an n analog signal, e.g. for the speed reference, is immune to
interference entering the inverter module over the digital signal lines.
The two analog inputs may be used either both with analog or both with
digital function.
If the analog inputs are to be assigned digital functions, when using the
internal 24 V auxiliary voltage it is necessary to interconnect the two
grounds (DGND and AGND).
(1) DGND = Digital ground
(2) AGND = Analog ground
Figure 4.12
Isolation method for the control terminals
Analog control
terminals
Digital control
terminals
Live components
M
3~
R
B
Motor
Mains
AGND
DGND
(2)
(1)