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This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022

 

LC 1 light unit

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a2bur
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England
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a2bur Posted: Sat, Dec 5 2015 9:18 AM

Hi all . Dose anyone have a circuit diagram for a LC1 light controller , have thee of these but only hade two in use , decided to use the third on a another lamp and wired it the same as the others and worked fine in my workshop but when I plugged it into the wall socket in the hall it tripped the RCD . After rewiring a few times I discovered the wall socket had live and neutral reversed so corrected that and the lamp worked for a while but then tripped the RCD again and had a smell about it . Have got it apart but my electrician need a circuit diagram , can anyone help . Richard

jvezina
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Montreal, Canada
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jvezina replied on Tue, Dec 8 2015 9:31 PM

Good afternoon,

To my knowledge, a schematic diagram for the LC1 has never been released "officially" by B&O (the service manual for it is very succinct) but one member of this forum has mentioned seeing one. I would also like to have a schematic for eventual future repairs.

Best regards,

Jean

 

Wouter
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Netherlands
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Wouter replied on Tue, Dec 8 2015 11:19 PM

A solution to this problem can be found here! Leslie`s picture is added below as well.

Wouter

riverstyx
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SouthWest UK
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riverstyx replied on Wed, Dec 9 2015 12:46 AM

Wouter:
Leslie`s picture is added below as well

It looks to me that the brown and blue supply wires are the wrong was round in this picture as P5 appears to be marked as 'N' on the PCB and the fuse sits very close to P2 so I suspect that is the Live terminal.

As mentioned in the other thread, it probably doesn't matter in parts of mainland Europe where the plugs can be rotated but it does matter in the UK.

Richard, does the lamp you are controlling require an earth (ie did the original cable have a green & yellow wire, or just brown and blue)? or is it double insulated (marked with the square inside another square symbol)?

Is there any visible bulging of either of the two capacitors (the devices marked 100/16 and 470/16V in the above photo) within the LC1, or do any of the components show any signs of overheating?

Does the coil in your LC1 look the same colour as in the photo, or has it turned darker / purple / black?

To confirm, is it definitely an RCD that is tripping (as opposed to the MCB for that circuit)?


Kind Regards,

Martin.

Homersaurus
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For the Type 2112, for UK wiring, the following is suggested:

P2 is the LIVE SUPPLY, marked with an Arrow and L

P5 is the NEUTRAL SUPPLY, marked with an Arrow and N

P3 is the LIVE LOAD (lamp) out, marked with a Arrow and E (which is not Earth but must the be equivalent to LOAD)

P4 is the NEUTRAL LOAD (lamp) out, marked with an Arrow.

 

The screw terminal is not Ground, it connects to an inner box and connects to the NEUTRAL of the supply.

If you connect an EARTH to this, then an MCB will trip.

If an EARTH is required, then connect the Supply EARTH directly to the Lamp EARTH bypassing the LC1.  The LC1 is designed for 2 wire (without an EARTH) operation.

 

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