Ec 43 (Three-Wire Npn) For Dc - Endress+Hauser nivocompact FTC 831 Installation And Operating Manual

Nivocompact FTC 831
Transistor Circuit for Load
Protection Against Voltage Peaks
Fig. 12
Connecting the Nivocompact with electronic
insert EC 43 (NPN connection)
F: Fine-wire fuse, load-dependent
R: Connected load, e.g. PLC, PCS, relay
M: Ground connection to silo or
metal parts near to the silo
E: Grounding
16
Connecting the Nivocompact with Electronic Insert EC 43
(Three-Wire NPN) for DC
The load connected to Terminal 3 is switched by a transistor, contactless
and therefore without bounce.
Terminal 3 has a negative signal in normal switching mode.
The transistor is blocked on level alarm or with a power failure.
Connecting to an instrument with a high inductance:
a voltage limiter should be connected.
Connection