Recently fitted a Texecom Excel panel and noticed that the transformer has a
very audible hum!
Does this suggest weakness?
My previous panel (Pyronix Super) was silent.
Does the size of battery fitted have any relevance - I increased the battery
from 1.2Ah in the old panel to 7Ah in the new one.
TIA
Phil
The hum could be either loose laminations on the transformer, or mains
hum noise coming from a speaker/sounder. You need to work out which of
the two first.
> My previous panel (Pyronix Super) was silent.
> Does the size of battery fitted have any relevance - I increased the battery
> from 1.2Ah in the old panel to 7Ah in the new one.
If the battery was not fully charged when installed into the unit, then
it might be taking more current than usual to charge it up and thus
might be causing some of the hum.
--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk
CJ
Hum is occasionally a problem with mains transformers.
1. Tke a hammer & cold chisel, and give the laminations a whack
on each side. This jams the lams together, stopping hum.
2. Mount the transformer on rubber washers and it'll be much
quieter.
NT
>
> Hum is occasionally a problem with mains transformers.
> 1. Tke a hammer & cold chisel, and give the laminations a whack
> on each side. This jams the lams together, stopping hum.
> 2. Mount the transformer on rubber washers and it'll be much
> quieter.
>
>
Thanks to all.
Prefer the sound of tweaking the transformer screws rather than hitting the
thing with a hammer and chisel.
The panel is already mounted off the wall on flexible packers.
Phil
"TheScullster" <ph...@dropthespam.com> wrote in message
news:XPSdnT8mhf9xfKLV...@eclipse.net.uk...
Doing that may make it worse.
Rather than hitting the laminations with a hammer....
On these small transformers there is usually a soft metal strap
surrounding the laminations which is U shaped. Squeeze the sides of the
U, perhaps in a vice.
CJ
One of those will work for you, one wont. We dont know which
until you try them. Hammering lams is standard practice for
silencing noisy transformers. Obviously one removes the thing
from the kit first :) Pointed chisel required, not a flat edged one.
NT