5
2.
INSTALLATION INSTRUCTIONS
2.1
EMC Requirements
For EMC compliance, good quality shielded cable should be used for connection to
this instrument.
The shields of both transducer and 4-20mA loop cables should
be connected as shown in Fig. 4.
Note 1 Cable shields to be grounded at only one end - the instrument end.
Note 2 When the instrument is a small part of a large electrical installation,
ensure the cables to and from the instrument are segregated from
electrically noisy cables.
Note 3 Ensure cables to and from the instrument are routed away from
any obviously powerful sources of electrical noise, e.g. electric
motors, relays, solenoids.
Note 4 ESD precautions should be used when working on the instrument
circuit board with the lid removed. The user should ensure he is
"grounded" by use of a wrist strap or at least touching ground
before touching any component including wires, terminals or
switches.
Note 5 The body of the transducer and the S7TW case should be
grounded. If the transducer fixing attachments to not provide a
good ground, then a ground strap should be used.
2.2
Supply/Output Connections
The two wires from the supply/output monitor are connected to terminals 6 and 7.
Polarity of supply is irrelevant as a reverse polarity protection circuit automatically
energises the oscillator/demodulator with the correct polarity.
Fig. 1 General view of S7TW
SPAN
I F
ZERO
1
2
3
4
5
6
7
E
X
C
IT
S
IGN
A
L
4
-2
0
mA
LVDT AMPLIFIER S7TW
TB1
Filter 8
Zero Input 7
