19
In control cabinet:
Wiring the conductivity controller / the operating & display unit
Connection of supply voltage
Each conductivity controller and operating unit is supplied with 24 V DC and provided with an internal
(URB) or external (LRR 1-5.., M 0.5A) fuse. The equipment is separately supplied with 24 V DC and fused
with an external semi-delay fuse 0.5 A. Please use a safety power supply unit with safe electrical isolation.
The power supply unit must be electrically isolated from dangerous contact voltages and must meet at
least the requirements on double or reinforced isolation according to one of the following standards:
DIN EN 50178, DIN EN 61010-1, DIN EN 60730-1 or DIN EN 60950.
After switching on the supply voltage and start-up of the equipment the LED of the conductivity
controller LRR 1-52, LRR 1-53 lights up green.
Connecting conductivity electrode LRG 12-2, LRG 16-4, LRG 17-1 and LRG 19-1,
resistance thermometer TRG 5-..
To connect the equipment use screened multi-core control cable with a min. conductor size 0.5 mm
2
,
e.g. LiYCY 4 x 0.5 mm
2
.
Wire terminal strip in accordance with the wiring diagram.
Fig. 7
Connect the screen only once to the central earthing point (CEP) in the control cabinet.
Make sure that connecting cables leading to the equipment are segregated and run separately from
power cables.
Connecting output contacts
Wire the upper terminal strip
1
(terminals 16-27) according to the desired switching functions.
Provide an external slow-blow fuse 2.5 A for the output contacts.
When switching off inductive loads, voltage spikes are produced that may impair the operation of
control and measuring systems. Connected inductive loads must be provided with suppressors such as
RC combinations as specified by the manufacturer.
When used as conductivity limiter the conductivity controller LRR 1-52, LRR 1-53 does not interlock
automatically when the readings exceed the MAX limit.
If an interlock function is required for the installation it must be provided in the follow-up circuitry
(safety circuit). The circuitry must meet the requirements of the EN 50156.
The conductivity electrode LRG 16-9 is equipped with a sensor plug-in connection type M 12, with 5
poles, A-coded, pin assignment see
Fig. 7.
For connecting the equipment control cable assemblies
(with male and female connectors) of various lengths are available as add-on equipment.
To connect the conductivity controller LRR 1-52 remove the male connector and wire the terminal strip
according to the wiring diagram.
Fig. 7
Connect the screen only once to the central earthing point (CEP) in the control cabinet.
If you do not use the prefabricated control cable assembly, use screened five-core control cable, e. g.
LiYCY 5 x 0.5 mm
2
, for connecting the equipment. In addition, connect at the electrode end a screened
female connector to the control cable.
Make sure that connecting cables leading to the equipment are segregated and run separately from
power cables.
Connection of conductivity electrode LRG16-9
Содержание LRR 1-52
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