Cable Break; Short Circuit; Electrical Connection - Tecsis F1301 Betriebsanleitung

Betriebsanleitung/Operating manual
F1301/F13C1
An external independent control unit activates relay A which changes
the output by a certain value. Because of security reasons the control
unit has to be a 2-channel one. When the expected change of the output
signal is detected it can be assumed that the whole signal path
(Wheatstone Bridge – amplifier – output) works well. If it does not
appear it can be concluded that there is a defect in the signal path.
The standard adjustment of force transducers with current output for
overload control is e.g.:
4
3,8

cable break

With activating the check relay a fixed signal jump of 4 mA will exceed
the overload limit in every working condition. The measurement's upper
limit of 20 mA however will never be reached. This makes the checking
of the signal jump possible.
8

Electrical connection

Electrical and magnetic fields often generate interfering voltage in the
measuring circuit. This interference essentially emanates from high
voltage current running parallel to the measuring lines, but can also be
caused by contactors or electric motors operating in the vicinity.
Interfering voltage can also be introduced galvanically. This particularly
occurs in cases where the measuring chain is earthed at various points
that do not have the same potential.
To avoid the coupling in of interference, please note the following:
Always use shielded, low-capacity measuring cables (all tecsis
cables meet these requirements, see chapter 10.1).
Do not route the measuring cable parallel to high-voltage current
and control cables.
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overload
(125% nominal load)
Fig. 3 signal SIL electronic
BD_BE 982
16 20

short circuit

[mA]
21
27