8.2 Auxiliary voltage
8 Connections
Technical description
256
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VM259.EN007
8.2.
Auxiliary voltage
The external auxiliary voltage U
aux
(standard 40…265 V ac/dc
or optional 18…36 Vdc) for the terminal is connected to the
terminals X3: 17-18.
NOTE! When optional 18…36 Vdc power module is used the polarity is as
follows:
X3:17 positive, X3:18 negative.
8.3.
Serial communication connection
The device can be equipped with two optional communication
interfaces:
Option 1: inbuilt Ethernet ST-fiber interface or option module 1
Option 2: inbuilt Ethernet RJ-45 interface or option module 2
The physical location of the communication options is at the
back of the relay. The option modules can be installed at the
site, but the inbuilt Ethernet modules are installed at the
factory (see chapter 12 for more information).
Figure 8.3-1 Example of VAMP259 back panel serial communication
connection
The internal connection in both communication modules is
identical (see Figure 8.3-2). The transmit and receive lines of
all the three ―logical communication ports‖ REMOTE, LOCAL
and EXTENSION port are available for both modules (RS-232
signal levels). Depending on the module type one or more of
these ports are physically available at the external connector.