IEC AC Filter

jarthel · 31st July 2006, 12:04 AM

can someone please tell me if the ground output of this filter is derived ground and the AC ground is left hanging?

Here's the schmetic: http://www.cor.com/Series/IEC/EEAEEB...-Schematic.gif

If it is derived ground, does that mean I cannot connect the metal chassis to this derived ground. I've always grounded the metal chassis to AC ground for safety.

Thank you.

ps. I haven't bought the filter yet.

poobah · 31st July 2006, 12:14 AM

That ground is connected straight through. The identical symbols imply an identical node (wire). The ground is not "derived".

You will also find those to be a nice device and very cost effective.

jarthel · 31st July 2006, 12:24 AM

Quote:

Originally posted by poobah
That ground is connected straight through. The identical symbols imply an identical node (wire). The ground is not "derived".

You will also find those to be a nice device and very cost effective.

thanks for the help

poobah · 31st July 2006, 01:19 AM

Keep in mind, I've heard plenty of comments around here that those things will "constrict" your sound... pure B.S. Make sure you have an adequate current rating in the device you choose.

The rectifiers in your PSU will make some RF (hash) of their own of course, but YOU control that. The power line is a different story.

AndrewT · 31st July 2006, 01:15 PM

Hi,
re post1:- what is that resistor for?
To discharge the three tiny capacitors?

You can buy chassis mount version that range from about 1A to 6A.

You can also build your own.
But, since you are working with mains voltage you must know what you are doing and how to protect users and maintenance technicians.

SY · 31st July 2006, 01:25 PM

Quote:

what is that resistor for?

WAG here, but I'd wager that it's there in case the line (source) circuit is disconnected.

Brian Beck · 4th August 2006, 03:48 PM

Yes, it would bleed stored charge off the caps for safety’s sake, in case connections to the load and line are both opened. My guess is that the shunt resistor also figures into the damping of the resonance(s) created by the shunt Cs and series Ls. Neither the line nor the load will have known or controlled impedances and can offer no guarantee of damping of resonances by themselves. In particular, the line side impedance could be dominated by high series inductive reactance, thereby contributing only reactance to the resonant mix. The resistor might then set a worst-case maximum value of Q.

31st July 2006, 12:04 AM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	IEC AC Filter can someone please tell me if the ground output of this filter is derived ground and the AC ground is left hanging? Here's the schmetic: http://www.cor.com/Series/IEC/EEAEEB...-Schematic.gif If it is derived ground, does that mean I cannot connect the metal chassis to this derived ground. I've always grounded the metal chassis to AC ground for safety. Thank you. ps. I haven't bought the filter yet.

31st July 2006, 01:15 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, re post1:- what is that resistor for? To discharge the three tiny capacitors? You can buy chassis mount version that range from about 1A to 6A. You can also build your own. But, since you are working with mains voltage you must know what you are doing and how to protect users and maintenance technicians. __________________ regards Andrew T.

4th August 2006, 03:48 PM	#7
Brian Beck diyAudio Member Join Date: Dec 2004 Location: South Florida, USA	Resistor? Yes, it would bleed stored charge off the caps for safety’s sake, in case connections to the load and line are both opened. My guess is that the shunt resistor also figures into the damping of the resonance(s) created by the shunt Cs and series Ls. Neither the line nor the load will have known or controlled impedances and can offer no guarantee of damping of resonances by themselves. In particular, the line side impedance could be dominated by high series inductive reactance, thereby contributing only reactance to the resonant mix. The resistor might then set a worst-case maximum value of Q. __________________ Brian

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31st July 2006, 12:14 AM	#2
poobah diyAudio Member Join Date: Nov 2005	That ground is connected straight through. The identical symbols imply an identical node (wire). The ground is not "derived". You will also find those to be a nice device and very cost effective.

31st July 2006, 01:19 AM	#4
poobah diyAudio Member Join Date: Nov 2005	Keep in mind, I've heard plenty of comments around here that those things will "constrict" your sound... pure B.S. Make sure you have an adequate current rating in the device you choose. The rectifiers in your PSU will make some RF (hash) of their own of course, but YOU control that. The power line is a different story.

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