GND on STG inputs

Edward Sciberras

Posted on 16.03.2017 15:26

Attached are two screenshots from the setup screens for an LV channel and an STG channel (both HS versions). As I understand it from the image, the In- input on the STG channel is indicating that a ground connection needs to be made externally? Whereas on the LV input, this is shorted internally. However the ambiguity becomes more complex because in the Sirius Technical Reference manual (v 1.5.0) they are shown exactly the same with the In- pin shorted internally (5.20.5.1 and 5.21.4.1). Which one is correct and what would be the implications of using the ‘floating’ STG channel as an LV input?

DEWESoft Support
Technical support
Posted on 17.03.2017 10:20

Hi,

the ground connection that is shown in channel setup for Sirius-HS-STG is wrong in DEWESoft X2 versions prior to SP9 RC10. If you have a version of the software older than this, please upgrade to the latest version if possible. If you would rather keep using the same version then please just ignore the wiring diagram that is shown in channel setup. The connection in the manual is correct. This also means that the connection for both types of modules (LV and STG) is the same.

Edward Sciberras

Posted on 07.04.2017 13:28

Thanks, the wiring diagram is in fact now fixed with the newest X2 version.

My next question then follows as to why the STG inputs indicate an overload when not connected to an input. In the attached setup screenshot, the STG inputs are all indicating an overload. A-7, A-8 and C-1 are all connected to a signal whereas the rest of the inputs are not connected to anything (slices A and B are HS-HV/LV types). The three inputs which are connected to a transducer are not overloaded, but also the LV inputs which are floating are 'happy'.

Why is this different for the HS-STG inputs? I had thought at first that it was a difference in the grounding arrangement but it seems not.


Attached files:
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