Transmitter WST 3
7
Installation
Mechanical installation
Each transmitter WST 3 contains several circuit boards, built into a protective plastic
housing which can be snap-mounted on a 35 mm wide DIN rail, or mounted on a flat
surface by two 4 mm screws.
The transmitter should have at least 10 mm free space on each side.
Electrical installation
For the electrical connections to the connector and terminal blocks of the transmitter
shielded cables are needed, except for the power supply. All cables should be routed
so that electromagnetic interference from power cables is avoided.
Cable connection is shown in the diagrams below.
Transducer input
Terminals 1 – 7 (8).
Transducer connection should be handled with great care to achieve best measuring
data. Integrated transducer cables may not be shortened.
NOTE!
Transducer cables must be routed at least 200 mm away from 230/380 V,
50/60 Hz power cables. By cables with other frequencies or high power,
an even wider distance is preferable.
4-wire connection should be used if the integrated transducer cable can be connected
directly at WST 3. By 4-wire connection, excitation and sense must be interconnected
at the transmitter, see diagram below. The cable shield and terminal 5 should be
connected to earth via the mounting rail.
6-wire connection should be used if the integrated cable must be lengthened or if several
transducers should be connected to the transmitter.
Connect the cable shield and terminal 5 to earth via the mounting rail. In the diagram
below connections are shown for the junction box SL-4 from Vishay Nobel.
2
1
3
6
4
7
EXC+
SENSE+
SHIELD
SIGN.+
Exci
Excitation -
Signal -
Transducer
Junction box SL-4
4-wire connection
6-wire connection
5
8
CAL
EXC–
SENSE–
SIGN.–
Exc.+
Sign.-
Exc.-
Sign.+
J11
J12
J13
J14
J1
J101
J102
J103
J104
J106
J108
J10
J105
J107
J59
J58
CAL
R
EXC+
SENSE+
SHIELD
SIGN.+
CAL
EXC–
SENSE–
SIGN.–
Exc.+
Sign.-
Exc.-
Sign.+
Exc.+
Sign.-
Exc.-
Sign.+
J21
J22
J23
J24
J31
J32
J33
J34
J41
J42
J43
J44
J2
J3
J4
2
1
3
6
4
7
5
8
Transducer
Transducer
Transducer
