phlize Posted February 25, 2009 Share Posted February 25, 2009 A couple of weeks ago I bought a Scantronic 9651EN-41 (9651 c/w 9941) panel from you. Having now installed it I'm surprised that the transformer in the panel has a noticeable hum/buzz. The problem is that the panel is located in the living room rather than out of the way in the attic or similar. It is where it is because I wanted to do a straightforward replacement for a Menvier stand-alone(ie no RKP) panel that had gone on the blink, with minimum re-wiring. Is this hum/buz normal? The Menvier was totally silent. Quote Link to comment Share on other sites More sharing options...
Secware_Tech6 Posted February 25, 2009 Share Posted February 25, 2009 phlize Some buzz is normal and all transformers buzz slightly. The metal box of the 9651 will also slightly amplify it. But it may be too loud its impossible to say from here lol as i cant hear it. You may try 2 things first 1. ensure the screws/bolts holding the transformer are tight. 2. ensure panel is well fixed to the wall and no part is slightly sprung (to test 2 just slightly loosen all the fixing screws and see if it goes quieter) but this is a temp test the panel must be securly fixed. As a last resort if you have really sensitive hearing and its not a faulty transformer you will need to damp the transformer where it mounts the control panel. Small rubber washers are best and need to be inserted between the 2. If the vibrations are the lid, backplate etc then you can remove these by adjustment. If the transformer is faulty and is delaminating (the bits of metal in the former are vibrating together) then we will replace it. Hope that sort of helps Support Quote Link to comment Share on other sites More sharing options...
phlize Posted February 28, 2009 Author Share Posted February 28, 2009 Ok, thanks for the advice. The rubber washers were my next job - I've already tried the other things, in fact the buzz reduces with the cover on as it holds the metal sides tight, without the cover you can actually feel the sides vibrating. Believe me my hearing is not that sensitive - the buzz is loud!! i'll let you know how I get on. Quote Link to comment Share on other sites More sharing options...
Secware_Tech6 Posted March 2, 2009 Share Posted March 2, 2009 SOunds like it isnt the transformer but the case vibrating. It isnt over loaded is it? ie what is the standby current of the system? Quote Link to comment Share on other sites More sharing options...
phlize Posted March 4, 2009 Author Share Posted March 4, 2009 I'm only using 3 zones, all with PIR's plus the bell box so it can't be overloaded, the case vibration stops when the front cover is screwed on. Also, putting a finger on the transformer you can feel the vibes. Phil. Quote Link to comment Share on other sites More sharing options...
Secware_Tech6 Posted March 4, 2009 Share Posted March 4, 2009 they do vibrate, a faulty transformer is when the laminations of the transformer buzz (ie the transformer itself) but your system could be overloaded (not by design ie your equipment is fine) by a fault. You need to test the day mode current to ensure its correct. Also a faulty battery can draw too much current you might want to check the charge current also. Support Quote Link to comment Share on other sites More sharing options...
phlize Posted March 9, 2009 Author Share Posted March 9, 2009 ok, I'm pretty sure it's the transformer. If it was overloaded surely the 250mA fuse would blow?? Quote Link to comment Share on other sites More sharing options...
phlize Posted March 9, 2009 Author Share Posted March 9, 2009 Also, forgot to mention - I measured the transformer output at 18.3v Quote Link to comment Share on other sites More sharing options...
phlize Posted March 9, 2009 Author Share Posted March 9, 2009 Ok, now understand that the fuse wouldn't blow as they can take up to 10x rated current. I've now measured the current drawn at 163mA. Quote Link to comment Share on other sites More sharing options...
Secware_Tech6 Posted March 11, 2009 Share Posted March 11, 2009 that sounds ok, however i waqs meaning the xurrent draw of the dc side (ie put meter in series with battery and remove mains power, check resultanct dc current draw.) Support Quote Link to comment Share on other sites More sharing options...
phlize Posted March 29, 2009 Author Share Posted March 29, 2009 Yes, That's how I measured the 163mA. current draw. Quote Link to comment Share on other sites More sharing options...
Secware_Tech6 Posted March 30, 2009 Share Posted March 30, 2009 thats very low. But is certainly more than ok. Quote Link to comment Share on other sites More sharing options...
phlize Posted April 14, 2009 Author Share Posted April 14, 2009 It looks like a straightforward job to replace the transformer. This would be my preferred route rather than disconnecting everything to send the whole box back - that's quite a big job & leaves me without an intruder alarm for days. Quote Link to comment Share on other sites More sharing options...
Secware_Tech6 Posted April 14, 2009 Share Posted April 14, 2009 from a returns point of view the whole unit will need to be swapped. but be sure it is a faulty transformer. Support Quote Link to comment Share on other sites More sharing options...
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