Flowline LV42 Switch-Tek - Manual (Page 8)

8 of 10 MN301200 Rev A
WIRING Step Five
ELECTRICAL CONNECTIONS:
The LV41 and LV42 series feature a SPDT relay contact. SPDT, single pole double throw allows for operation of
both increasing and decreasing level, depending on the connections made between the terminals of the
micro‐switch and the cable. SPDT, which is a three‐conductor cable, has one lead that is common, one that is
normally open (NO), and the other that is normally closed (NC). For the proper connections of these
conductors please refer to the wiring diagrams below.
NC Wiring:
The Normally Closed (NC) wiring is typically used for a filling operation. The contact will close at a low level
and open at a high level.
NO Wiring:
The Normally Open (NO) wiring is typically used for an emptying operation. The contact will close at a high
level and open at a low level.
Warning: When making the connections described above, ensure that the maximum motor
power does not exceed the values indicated on the level switch. The power supply cable is
an important part of the sump float. Should the cable appear to be damaged, discontinue
use immediately and proceed to replace the unit. The terminal used must also be protected
against accidental break. Also,
correctly insulate any wire not in use.