Siemens SITRANS FST020 IP65 NEMA 4X Guia De Inicio Rapido página 36

Troubleshooting/FAQs
5.1 Troubleshooting
Error or Message
Invalid Setup (use
Direct Mode)
Low Signal - Press
<ENTER>
Detection Fault
Note
If you receive a Detection Fault message, it is strongly recommended that the Partner
(http://www.automation.siemens.com/partner) be contacted.
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Probable Cause
During the Initial Makeup the system

detects invalid sensor spacing,
erroneous liquid pipe parameters, or
some other factor that prevents it from
completing the Initial Makeup.
During the Initial Makeup the flow meter
decides that the level of the receive signal is
insufficient for proper operation.
If it appears that the flow meter cannot
complete an Initial Makeup it means that the
pipe and/or liquid conditions do not permit a
receive signal that meets the flow detection
standards. The system will not operate.
Solution
This may be due to one of the following:
An out-of-range data entry.

An invalid condition (e.g., overlapping sensors

in Reflect Mode). If selecting Direct Mode does
not resolve, review all site setup and sensor
installation choices particularly data entered for
pipe and liquid.
In Reflect Mode the flow meter detects that the

pipe wall signal may infringe upon the liquid
signal. Use Direct Mode instead.
Press <ENTER>, <Up Arrow>, <Down Arrow>, or
<Left Arrow> to abort install routine. Continue
programming other site data in anticipation of
resolving the difficulty later. Call technical support
for help if necessary
Some reasons for low signal are:
Invoking [Install completed?] on an empty pipe.

Coupling compound insufficient; not applied or

evaporated.
A disconnected or broken sensor cable.

The pipe needs to be conditioned at the

mounting location.
Flush out large air bubbles.

The sensor cables are defective or not

connected to the correct channel.
The Set Empty routine performed when pipe

was NOT actually empty.
If you locate and correct the improper condition
immediately, press <ENTER> to resume the
installation procedure. Otherwise, press the <Left
Arrow> to abort the installation and conduct a
thorough investigation.
Attempt to improve operating conditions by
reinstalling the sensors at a different spacing
offset, or even at a different location on the pipe.
Switching from Reflect to Direct Mount may solve
the problem. However, operation may not be
possible if there is poor liquid or pipe wall sonic
conductivity.
FST020 IP65 NEMA 4X Quick Start
Operating Instructions, 03/2012, A5E03086489-05