LF 170 Installation
81
ba54104e09 11/2010
3.3.3 Relay contacts and current outputs
WARNING
If external electrical circuits that are subject to the danger of
physical contact are incorrectly connected to the relay contacts,
there may be a danger of life threatening electric shock. Electrical
circuits are regarded to be subject to the danger of physical
contact when there are voltages higher than the Safety Extra Low
Voltage (SELV).
Pay attention to the following points during installation:
z Electrical circuits subject to the danger of physical contact
must only be connected by a qualified electrician.
z Electrical circuits subject to the danger of physical contact
must only be connected when they are voltage-free.
z Switching voltages and switching currents on the relay
contacts must not exceed the values specified in chapter 8
T
ECHNICAL DATA. Protect electrical circuits against currents that
are too high with an electrical fuse.
z After the monitor has been installed, it may only be opened if
the mains voltage and all external voltages have been switched
off beforehand.
An overview of the relay and current outputs of the individual
instrument versions can be found in section 1.2 O
UTPUTS AND
INTERFACES. The configuration and parameterization is described in
sections 4.4 to 4.5.
3.3.4 RS 485 digital interface (RS option)
Note
The connection of the monitor to other instruments via the RS 485
interface is described in detail in a separate manual that accompanies
the RT RS instrument versions.
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