Endress+Hauser nivocompact FTC 831, Инструкция по установке и эксплуатации

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Connection
Wiring Connection
Main Features of the Different
Electronic Inserts The last number of the order code on the nameplate identifies which type of
electronic insert is mounted in the Nivocompact FTC 831:
1=Electronic insert EC 40
Two-wire AC; voltage: 21 V
…
250 V
Electronic switch, max. 350 mA
2=Electronic insert EC 42
Three-wire DC; voltage: 10 V
…
55 V
Transistor circuit, load connection PNP, max. 350 mA
3=Electronic insert EC 43
Three-wire DC; voltage: 10 V
…
55 V
Transistor circuit, load connection NPN, max. 350 mA
4=Electronic insert EC 44
with potential-free relay output
AC power supply 21 V
…
250 V or
DC power supply 20 V
…
200 V
Load Limit Values Note the limit values of the loads to which you want to connect the
Nivocompact. Exceeding the load can destroy the electronic insert (or the
relay contact in the EC 44).
Fuse Ensure that the rating of the fine-wire fuse corresponds to the maximum
load to be connected.
The fine-wire fuse does not protect the electronic insert of the Nivocompact
FTC.
Diameter of Wiring Because of the small current used, only small diameter cabling is required.
Low-cost cabling with diameters of 0.5 mm
2
to max. 1.5 mm
2
is
recommended.
Earth Connection, Grounding
The Nivocompact must be grounded to give reliable operation free from
interference. This is done by either connecting it to a grounded silo with
metal or reinforced concrete walls or else to the earth conductor PE.
The probe requires a good counter potential which is achieved by
connecting the ground connection on the outside of the housing to an
electrically conductive part of the silo.
If the silo is made of non-conductive material, then connect conductive and
grounded components near to the silo to the ground connection.
The connecting cable should be as short as possible.
Fig. 9
Electrical connections available with the
different electronic inserts
Connection
13