12
Installation
Installing logic unit SRL 6-40 – 1
Attention
All bus-based equipment must feature the baud rate setting 250 kbit/s
(with cable length up to 125 m).
If the logic unit has a different baud rate when supplied you have to change the baud rate
settings of the other bus-based devices so that they all feature the same baud rate.
The enclosure of the logic unit is designed for wall mounting and should be installed close to the
external level pot. The four fixing holes are freely accessible after removing the upper part of the
enclosure. The dimensions of the fixing holes are embossed on the back of the case.
Electrical Connection
Connecting limit switch and relay output terminals
The level pot is provided with three shut-off valves. Both valves D and E are fitted with two limit
switches for “OPEN” position (D 1 / E 1) and “CLOSED” position (D 2 / E 2).
The drain valve F is fitted with only one limit switch for the “CLOSED” position.
The limit switches must be provided with volt-free relay contacts.
For connecting the limit switches we recommend a control cable, e. g. Ölflex 110 H, 7 x 1 mm
2
and the
installation of an intermediate distribution frame (IDF) close to the level pot. For connecting the IDF to
the logic unit a control cable assembly (with connector) is supplied with the equipment.
External indicators for “Stand-by time running” and “Stop” can be connected directly to the relay out-
put terminal. Use the cable gland in the housing for the conntecting cables.
Bus cable, cable length and size
Screened multi-core twisted-pair control cable, e. g. UNITRONIC
®
BUS CAN 2 x 2 x .. mm
2
;
Li 2YCY 2 x 2 x .. mm
2
must be used for the bus line.
Control cable assemblies (with male and female connectors) of various lengths are available as add-on
equipment.
The cable length dictates the baud rate (data transfer rate) between the bus nodes, and the total power
consumption of the sensor dictates the conductor size.
Factory set default
baud rate: 250 kbit/s
(cable length up to 125 m).