Connecting 2 tubes to ballast - The Planted Tank Forum
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post #1 of 19 (permalink) Old 12-10-2003, 07:42 PM Thread Starter
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I am trying to connect 2 18watt flourecent tubes to a 40watt magnetic ballast.

Think I have the wiring wrong!!!!!!!!!!

I can get both of the lamps to work when i wire them indiviualy, but not together...

Please help

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post #2 of 19 (permalink) Old 12-10-2003, 08:31 PM
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I've never even heard of bulbs running in series on a magnetic ballast. Where did you get this idea?

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post #3 of 19 (permalink) Old 12-10-2003, 08:36 PM Thread Starter
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Dunno, on the ballast it says it can run 2 x 18watts amongst other things.

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post #4 of 19 (permalink) Old 12-11-2003, 12:10 PM Thread Starter
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post #5 of 19 (permalink) Old 12-11-2003, 05:31 PM
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Are you sure you have the proper starter in line with each bulb? Sorry, I am not quite as familiar with filament-start magnetic ballasts. Maybe head to the place you bought the ballast and ask them to help you get it working.

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post #6 of 19 (permalink) Old 12-11-2003, 06:03 PM Thread Starter
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In the single lamp configuration I tested all the starters I have for duds, they were all fine, and rated for between 5 and 40watt. Strangely once i managed to switch it on without the starter even in.

I have temporarily added another balast to drive a second tube until I can figure this out.
The ballast is very nice, makes no sound, and is half as hot as the other one.

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post #7 of 19 (permalink) Old 12-11-2003, 07:51 PM
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If a bulb is still fairly warm, it can start without a starter. Some ballasts use the power switch to turn on a bulb by shorting out the filaments while you press the switch. This heats up the gas enough to get it started. But I still don't know why your setup doesn't work.

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post #8 of 19 (permalink) Old 12-11-2003, 08:37 PM Thread Starter
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In the diagram does the symbol attched represent a swithch or the little starter thingies...

And what is the symbol with the little crecents (what2.gif)

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post #9 of 19 (permalink) Old 12-11-2003, 10:13 PM
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the lowest pic is a switch. I'm not sure about the upper pic, it looks like some thread extension or so.

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post #10 of 19 (permalink) Old 12-11-2003, 10:15 PM Thread Starter
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then where woud the starter go? I have them there currently in the single lamp config.

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post #11 of 19 (permalink) Old 12-11-2003, 10:21 PM
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The starter is the C (capacitor) symbol i think...

- grtz Pepijn
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post #12 of 19 (permalink) Old 12-11-2003, 10:23 PM Thread Starter
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So its not needed in a 2 tube config then?

I used to do electronics as a hobby when I was at school so I am also reading that one symbol as a switch, I just though their had to be a starter, lol. (kind of an interpretation - thinking their diagram is wong at the time)

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post #13 of 19 (permalink) Old 12-11-2003, 10:27 PM
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probably not, looking at the scheme, ther is a " - " in the micro Fahrad table where there are 2 lamps connected. (218 aand 220)

- grtz Pepijn
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post #14 of 19 (permalink) Old 12-11-2003, 10:31 PM Thread Starter
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Allthough I'm not exactly looking fwd to undoing all of this again, the current heat leaves me with some safety concerens for the old balast, which i'd rather rremove, driving 2 tubes off this one.

now if only someone could tell us what the curvy symbol is....

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post #15 of 19 (permalink) Old 12-11-2003, 10:35 PM
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I wish you success and just remember it's on your own risk

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