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Connection
Connecting the Nivocompact with Electronic Insert EC 30
for AC (Two-Wire Connection)
The level limit switch Nivocompact with electronic insert EC 30 must
- like all switches - be connected in series with the load (e.g. relays,
microcontactors, lamps) to the power supply.
Direct connection to the power supply without any intermediate load
connected (short-circuit!) will result in immediate and permanent damage
to the electronic insert.
The load can be connected to Terminal 1 or 2 of the electronic insert.
It is unimportant whether L1 is connected to Terminal 1 or 2.
The voltage across Terminal 1 and 2 of the electronic insert must be at least
21 V.
The power voltage must be correspondingly higher to compensate for the
voltage drop across the connected load.
Note that loads connected in series are not completely disconnected from
the power supply if the electronic switch in the electronic insert of the
Nivocompact »disconnects« (blocks) with level alarm.
Because of the current requirements of the electronics, a small »no-load«
current still flows through the connected load.
When the load is a relay with a very small retaining current, then the relay
may not de-energise. In this case connect an additional load in parallel to
the relay, e.g. a resistor or signal lamp.
Connecting in Series to a Load
Power Voltage
Load Cutoff
Fig. 12
Connecting the Nivocompact FTC 731
with electronic insert EC 30
∼:21 V...250 V across Terminals 1 and 2
U
1-2
of the EC 30
R:
Connected (external) load, e.g. relay
F:
Fine-wire fuse, load-dependent
U
: Voltage drop across the load and the
R
fine-wire fuse
M: Ground connection to silo or to metal parts
near to the silo
E:
Grounding
13
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