Operating and service instructions
|
LMS 120
6
3.2. Electrical connection
3.2.1.
Connection terminals
Terminal
Description
12V
+
-
12V +
12V -
Low voltage
(optional)
Alarm
NO
COM
NC
Make cont’t
Root
Break cont’t
External fault
message
Channel 1
S1
Pipe
S2
Sensor
Pipe
Return
conductor
Channel 1
Channel 2
S1
Pipe
S2
Sensor
Pipe
Return
conductor
Channel 2
Tab. 1 (Terminals)
Note:
The
12V
terminal is reserved for a special
version of the LMS 120. It must not be used.
The
Alarm
terminal can be charged with an
ohmic load of up to 2A/ 30V.
Fig. 4 (Wiring diagram)
3.2.2.
Earth connection
To ensure smooth operation, the
earth contact (pipe)
of every measurement circuit
must
be
connected
with the
associated
pipeline.
When replacing existing leakage measurement systems, it is mandatory to check whether an
effective earth connection to the relevant pipe exists. Each measurement channel requires its own connection with
the pipeline.
3.2.3.
Power
Finally, the device plug has to be inserted into a socket. The LMS 120 can be operated with an alternating current
of 90…240 V AC
.
3.2.4.
Commissioning
After the mechanical and electrical installation, the LMS 120 parameters need to be set. The procedure is
described in Section
4.3. Quick parameter setting
on page 9.
