ULM–70 © Dinel
9
7 . elecTrical connecTion
Thelevelmeterisconnectedtoconsequential(evaluating)devicewithasuitablecablewiththe
outerdiameterof6to8mmusingscrewterminalslocatedunderthedisplaymodule.Therecom-
mendedcrosssectionofcoresforthecurrentversion2x0,5÷0,75mm2and for the version with
Modbuscommunication2x2x0,25mm2 (twistedpair,
shielded).Pluspole(+U)isconnectedtotheterminal
(+),minuspole(0V)totheterminal(-)andtheshielding
(onlyforshieldedcables)totheterminal( ).Commu-
nicationwiresAandBofthelineRS-485(forversion
"M"-Modbus)areconnectedtotheterminalsAandB.
Procedure to connect the cable to the level meter:
1. Unscrew the nut of the upper transparent lid.
2. Take the upper edge of the display module and
takeitoutcarefullybymildswingingup.
3. If you cannot grasp the module, you can use
a small screwdriver. Insert it as far as the seam and
usefromseveralsidestoslightlyliftthemodule.
4. Release the cable outlet and thread the stripped
supplycablein.
5. Connectthecabletothescrewterminalsaccord-
ingtothediagraminFig.17or18.Firmlytighten
theterminalsandthecableoutlet.
6. If the level meter with Modbus is involved as a
terminalforRS-485,werecommend(toavoidre-
ectionsontheline)toconnect120Ωtermination
resistor. This is done by moving a small lever of
theswitchmarked120ΩtotheONposition.Onthe
levelmetersconnected to thelineRS-485as an
intermediatedevice,theterminationresistorsare
notconnected(switchremainsoff).
7. Insert the display module back into the head so
thattheconnectorisproperlyconnected.
8. Slidesiliconesealonthethreadofthelevelmeter
body,thentightenthenutoftheupperlid.Connect
thecabletoconsequentialdevice.
display unit connector
Terminal block
metal clip
Electrical connection must be done in de-energized state!
With regard to possible occurrence of electrostatic charge on non-conductive parts of the
level meter, all level meters for explosive spaces (ULM–70Xi type) must be grounded. It
will be done using a screw placed on the head of the level meter under the cable outlet.
Fig. 17: Inside view of screw terminals of the level
meter with current output ULM-70_-_-_-I
Fig. 16: Wiring diagram of the level meter
with current output ULM-70 _-_-_- I
+ABIS
GND
ON
120
display unit connector
Terminal block
metal clip
120Ω switch
Fig. 18: Wiring diagram of the level
meter with Modbus ULM-70_-_-_-M
Fig. 19: Inside view of screw terminals of the level
meter with Modbus ULM-70_-_-_-M
