Hi Stephen,
I think this may be part of your problem, you should definitely be using the 15V side for you signal ground connection.
Think of it this way. The output of the oscillator is a varying voltage - or potential difference. This potential difference has to be "different" to something, which is the 0V rail of the PSU.
By connecting to the mains earth, you are relying on some other connection to provide the reference voltage for the oscillator, which can cause all kinds of problems.
Earthing of metalwork is a completely different issue and can be quite complex. I'm not an electrician, so can't give an authoritative point of view, but in this case, because the Mains is outside of the case, you shouldn't need a PPE (Power Protective Earth). If the mains is inside the case though, all metal panels should be electrically bonded together.
Personally, I prefer to earth everything, just to be on the safe side. I pick one place as the 'Earth Bonding Point' and star-wire earth connections back to this point for any metalwork.
Hope this helps.
Regards
Mike
Hope this helps
I think this may be part of your problem, you should definitely be using the 15V side for you signal ground connection.
Think of it this way. The output of the oscillator is a varying voltage - or potential difference. This potential difference has to be "different" to something, which is the 0V rail of the PSU.
By connecting to the mains earth, you are relying on some other connection to provide the reference voltage for the oscillator, which can cause all kinds of problems.
Earthing of metalwork is a completely different issue and can be quite complex. I'm not an electrician, so can't give an authoritative point of view, but in this case, because the Mains is outside of the case, you shouldn't need a PPE (Power Protective Earth). If the mains is inside the case though, all metal panels should be electrically bonded together.
Personally, I prefer to earth everything, just to be on the safe side. I pick one place as the 'Earth Bonding Point' and star-wire earth connections back to this point for any metalwork.
Hope this helps.
Regards
Mike
Hope this helps
--- In cgs_synth@yahoogroups.com, Stephen Richards <okayjustalittle@...> wrote:
>
> Hi Mike
>
> I'm connected to the Main Earth Stud on the 240V side for the Signal Out Ground Connection.
>
> So i should connect Signal Out Ground Connection to the Ground on the 15V side , is that correct ?
>
> Do any of the Earth / Ground connections need to be physically connected to the Chassis ?
>
> I'm going to keep my Signal Out Ground connection at the Power Module is it is at the beginning point for multiple module connections.
>
> My module power connections are Daisy chained pre CGS distro boards.
>
> cheers for the help
>
> Stephen
>
> [Non-text portions of this message have been removed]
>