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   Caravans and Caravanning -  Caravan Repairs, Servicing and Maintenance 		Share   Post on X / Twitter  Share on Facebook  Email  Printer Friendly Version Print
Subject Topic: Plug-in charging unit Post Reply Post New Topic
PersonJimathy2
24/4/2010 at 1:26pm
 Location: Rugby
 Outfit: Freelander:-Challenger 490 5se View Jimathy2's Profile View Profile   Reply to Jimathy2 Reply   Quote Jimathy2 Quote  
Joined: 10/3/2004

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Hi am trying to solve a problem with a 1992 Plug-in combo mains/charger 240/12v unit.  

When first examined the 2.5A 240v fuse on the input to the 12v printed circuit board was blown.  In addition the 25A 12v output from the pcb was also blown.  Having replaced these I then powered up the unit--the 240v feed comes through the usual 30mA rcd BEFORE it hits the printed circuit board.   The 240v 2.5A fuse blows (big time) yet the 0.03A residual current device doesn't trip.   Very weird suggesting that there is no control over the current passing through the residual current device.

There is no spec I know of for measuring an RCD performance to asses it--has anyone done this if so what value did you use?


PersonJimathy2
24/4/2010 at 2:27pm
 Location: Rugby
 Outfit: Freelander:-Challenger 490 5se View Jimathy2's Profile View Profile   Reply to Jimathy2 Reply   Quote Jimathy2 Quote  
Joined: 10/3/2004

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Ha anyone got a displaced "Plug-in" (Makers) unit ref CTTH  (240/12v)  fitted as original equipment in the early nineties--would happily pay postage  


Personarc systems
24/4/2010 at 11:06pm
 Location: None Entered
 Outfit: http: www.arcsystems.biz View arc systems's Profile View Profile   Reply to arc systems Reply   Quote arc systems Quote  
Joined: 02/12/2003

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I have a feeling the mains fuse is 1.25A not 2.5A? this would explain it blowing 'big time'
The reason though is probably a short across the transformer windings and nothing to do with earth so leaves the RCD alone

It should I would have thought be a KT12 unit? black and about the size of two house bricks but much heavier!
Still, it was fairly sophisticated power supply for it's day, however today it's very much old hat and better replaced with a modern multi stage switch mode model, for circa £75


Persondigisatman
25/4/2010 at 12:03pm
 Location: Royal Wootton Bassett
 Outfit: GrandlandX & Coachman 520 4& M-Mover View digisatman's Profile View Profile   Reply to digisatman Reply   Quote digisatman Quote  
Joined: 31/5/2009

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If replacing go forNumax 10a It will charge & run your lights at the same time, works perfect for me.


Persontimtheenchanter
25/4/2010 at 4:47pm
 Location: Yeadon Leeds!
 Outfit: Swift Challenger & Defender 110SW View timtheenchanter's Profile View Profile   Reply to timtheenchanter Reply   Quote timtheenchanter Quote  
Joined: 27/6/2005

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there are tests for RCDs, but it only measures the trip time, and current required to trip it, most sparkys will have the kit to test this.

however, the RCD does not trip in your case, as it s a short circuit fault (overload), not a fault to earth.

even then the fuse in your unit should blow before the MCB in your consumer unit does.



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