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From: default on 11 Dec 2009 10:57
On Thu, 10 Dec 2009 12:41:14 -0800 (PST), Matt
<matthew.n.johnson(a)gmail.com> wrote:

>On Dec 10, 1:50�am, Jasen Betts <ja...(a)xnet.co.nz> wrote:
>> On 2009-12-09, Matt <matthew.n.john...(a)gmail.com> wrote:
>>
>> > Hello all,
>> > I was hoping someone might be able to help with a problem I've been
>> > having with a TV lift I built. �I have an actuator that raises and
>> > lowers a TV for the bedroom. �It's wired with a DPDT switch. �I'm
>> > using a 12V 5A power supply.
>>
>> That power supplky seems a little light, I guess it depends on how
>> hard the TV is to move. �It could be the power supply overheating
>> and going into protective shutdown. if you haven't already try
>> adding some sort of counterweight like are used on lifts
>
>The specs on the actuator I'm using say 12 VDC, 5Amp current draw at
>full load. It's rated for 150 lbs and is lifting about 30 when the TV
>is loaded. The power supply I'm using is one you'd use for an LCD
>screen. It seems to lift things fine at first, but when it's been
>inactive for a while, it doesn't start again.
>
>I'll try place the lamp across the output and see what happens. (To
>answer one poster's remark, Yes, I'm an electronics neophyte with no
>formal training in the subject.)
>
>Thanks again to all for the input.


LCD power supplies aren't known for gorilla power. It may just be
over current and limiting output - lamp will tell you that.

A work around may be to have the supply charge a large cap to 12 volts
then when you raise or lower it would dump the stored energy and get
things started.
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