KROHNE LS 4100 EN - Manual (Page 12)

LS 4100/LS 4150 03/2002
12
The transistor switches a second, galvanically isolated voltage source to the binary input of a PLC
or to an electrical load.
Mode A
For mode B you have to switch the polarity of
terminals 1 and 4.
NPN action PNP action
Control of alternating current loads
The transistor switches a galvanically separated alternating voltage 10 … 42 V AC to a load.
Mode A
Note
The transistor outputs of several LS 4100/
LS 4150 can be switched in series or in parallel
to connect their signals logically.
The connection must be made such that
terminal 2 always has a higher voltage
compared to terminal 3.
Contactless electrical switch (SW E72 C)
Power supply 20 … 250 V AC, 50/60 Hz or 20 … 250 V DC (for further information see the
following connection examples as well as the technical data)
For direct control of relays, contactors, magnet valves, warning lights, horns etc. the instrument
must not be operated without connected load (switching in series), as the oscillator can be
destroyed when connected directly to mains. Not suitable for connection to low voltage PLC
inputs.
The domestic current is temporarily lowered below 1 mA after switching off the load so that
contactors, the load current of which is lower than the permanently flowing domestic current of the
electronics, are reliably switched off.
U
B
U
B
U
B U
B
U
B
U
B