Simons Voss Technologies SmartRelay 3 Manual page 59

SmartRelay 3 system (Manual)
-
+
1(1)
<
1(2)
2(1)
<
2(2)
+1
-
B1
A1
+2
-
B2
Controller
A2
+3
-
B3
A3
O4
O3
O2
O1
O+
I3
I2
I1
-
I+
External power supply
The readers (up to three readers per controller) are connected to the
controller at the designated points. The power for readers is provided from
an own power supply unit. A common reference potential is required for
data transmission between controllers and readers. As a result, the earth
systems in power supply units, the power supply and the controller must be
connected. Using an external power supply unit avoids potential problems
with voltage drops between controllers and readers.
Option 1: Using a earth connection
This configuration uses just one of the two earth connections available on
the reader. Since the two earth connections are connected to one another
electrically, it does not matter which one is connected to the earth. It is
sufficient to assign one earth connection to the controller. This establishes
a common reference potential, allowing data transmission to take place.
Since the earth connections on the controller are connected to one another
L
N
Power supply unit
+
-
-
+
Reader
-
B
A
-
+
Reader
-
B
A
-
+
Reader
-
B
A
8. Setting up
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