[R-390] R-390A line filter change - was: Hi there

[Roy Morgan]

On Feb 9, 2016, at 2:55 AM, gs at oaft.com wrote:

> 
> ...   glad to join the group.
>      working on R-390/A ... had to change line filter as expected.

Gerd,

Welcome to the mailing list - we are glad to have you.

I would like to ask what reasoning you went through to determine that the line filter needed to be replaced.

It’s well recognized that:

- the line filter can trip ground fault interruptor outlets and electrical panel GFI circuit breakers even it there is no fault
- the capacitors in there will act as voltage dividers and put half the line voltage on an UNGROUNDED chassis
- The bypass caps in there are quite old now, and MAY be leaky or shorted, but it may happen less than is suspected.
- replacing the caps IN the line filter is a messy job
- replacing the line filter with a modern IEC line filter makes sense to many folks.

Maybe your country operates on 220 or 240 volt “mains supply” - this would lead to leaky or shorted caps more often than stateside 120 volt supply.


Roy

Roy Morgan
k1lky68 at gmail.com
K1LKY Since 1958