Hi all
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.
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.
Hi Another common cause is if the panel is not fitted to a flat surface or a cable fouls it against the wall. Try light pressure against each corner & see if the hum increases or goes.As for battery IIR the Excell range will support a 7ah no problem if in doubt try
CJ
Hum is occasionally a problem with mains transformers.
NT
wrote
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
Doing that may make it worse.
TheScullster formulated on Friday :
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.
or even
Rgds
Steve
OOPS!! sorry typo
CJ
dribble epoxy resin into the transformer.
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
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