19
Wiring
The terminal box is screwed to the electrode and secured by a self-locking fixing nut.
Before wiring you can turn the terminal box by max. ± 180° into the desired direction (cable outlet).
LRG 16-40, LRG 16-41, LRG 17-40
Bus cable
The conductivity electrode is equipped with M12 sensor connectors (5 poles, A-coded), assignment
see
Fig. 10
. Control cable assemblies (with connector and coupler) of various lengths are available as
accessories.
Note that the recommended control cables are not UV-resistant and must be protected by a
UV-resistant plastic tube or cable duct.
If you do not want to use the control cable assemblies use screened multi-core twisted-pair control
cable – e.g. UNITRONIC
®
BUS CAN 2 x 2 x...mm
2
or Li 2YCY 2 x 2 x...mm
2
as bus cable or the pre-
assembled control cable that is available as accessory.
.
The baud rate (data transfer rate) dictates the cable length between the bus nodes, and the total power
consumption of the sensor dictates the conductor size.
The baud rate is set via code switches
3
(S8 to S10),
Fig. 6
. Default factory setting of conductivity
electrode LRG: baud rate 250 kbit/s (cable length 125 m).
For longer cable lengths reduce baud rate accordingly. Make sure that all bus nodes feature the same
settings.
S 8
S 9
S 10
Baud rate
Cable length
Number of pairs and
conductor size [mm
2
]
OFF
ON
OFF
250 kBit/s
125 m
2 x 2 x 0.34
Factory setting
ON
ON
OFF
125 kBit/s
250 m
2 x 2 x 0.5
OFF
OFF
ON
100 kBit/s
335 m
2 x 2 x 0.75
ON
OFF
ON
50 kBit/s
500 m
available on demand
(depends on bus configuration)
OFF
ON
ON
20 kBit/s
1000 m
ON
ON
ON
10 kBit/s
1000 m
Note
The max. baud rates and cable lengths indicated above are based on empirical values
obtained by GESTRA. In certain cases it may be necessary to reduce the baud rate in
order to ensure operational safety.
The design and preparation of the data cable is an important factor for the electro-
magnetic compatibility (EMC) of the equipment. Wiring should therefore be carried out
with special care.
If you do not use the preassembled control cable, connect the connector and the jack for
the CAN bus lines according to the wiring diagram,
Fig. 10
.
UNITRONIC
®
is a registered trademark of LAPP Kabelwerke GmbH, Stuttgart.
Содержание LRG 16-40
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