PC3000 Complete Installation guide iss 12 - Elektro-Trading
PC3000 Complete Installation guide iss 12 - Elektro-Trading
PC3000 Complete Installation guide iss 12 - Elektro-Trading
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Use of screened cables on thermocouples and other signals:<br />
Internal analogue input signal connections:<br />
Upscale break/RT current source<br />
<strong>PC3000</strong> <strong>Installation</strong><br />
PLANT CUBICLE DIN RAIL<br />
MOUNTED TERMINAL<br />
BLOCK<br />
Screened thermocouple<br />
or signal lead<br />
TC+<br />
TC-<br />
Filter Earth<br />
Thermocouple<br />
extended lead<br />
To cubicle earth or<br />
earthing bar<br />
(recommended)<br />
4 Channel Analogue Input Module<br />
The module provides upscale break as standard. Four links, LK101, LK201, LK301<br />
and LK401 are fitted by the factory. This results in a small (250nA) input bias<br />
current which can lead to measurement errors in certain applications.<br />
The RT variant uses the same four links for connecting the current source to the RT+<br />
terminal.<br />
The links should be removed:<br />
(1) During input calibration if the output impedance<br />
of the millivolt source is significent.<br />
(2) In applications involving strain gauge bridges with<br />
external excitation.<br />
(3) To use the RT variant for measuring millivolt level<br />
signals.<br />
CUBICLE<br />
TC+<br />
TC-<br />
Filter Earth<br />
Maintain screen continuity<br />
within cubicle in high noise<br />
environment and connect to<br />
filter earth (alternative)<br />
TO INPUT CIRCUITS<br />
PCB makes connection to earth<br />
in Version 2 and 3 racks via<br />
wiring earth clip mon PCB <strong>guide</strong><br />
and rack earth connection<br />
Link<br />
removed<br />
LK101<br />
9-7
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