Circuit won't dim

JD

Well-Known Member
Joined
Jan 1, 2005
Location
North Wales PA
As Bill above said, if you can power down the board and the channel stays on, it's most likely a fried SCR, SSR or Triac in the dimmer pack. This can happen at any time, even if a dimmer is brand new. Usually, there is a reason such as a lamp that flashed over or a shorted extension cable. Sometimes the reason cannot be pinned down, or may have occurred without notice (like a power surge.) Although dimmers have protection that helps avoid this, it is not and never can be 100%
 

Amiers

Renting to Corporate One Fixture at a Time.
Joined
May 28, 2009
Location
Phoenix, Az
Looks like you get to learn how to operate on a shoebox. Remember to wear all your PPE.

As a rule of thumb don’t overload your dimmers as the result can be a stuck open dimmer. Usually the fuses help take care of this but.... as it was said it could happen at any time.
 

JD

Well-Known Member
Joined
Jan 1, 2005
Location
North Wales PA
Beware of the ratings on 4 channel "shoebox" dimmers! Some say 600 watts per channel, others say 10 amps per channel. People see the 10 amps and think, oh cool, 1000 watts! Well, the 10 amp fuse is more there for fire protection. The Triacs used in most all of these packs is good for about 600 watts. Anything more and you run the chance of popping them. In addition, many packs are equipped with a 14/3 power cable with a 15 amp plug. That further limits the full pack load to about 1400 watts. (1800 for short duration.) In other words, even running three 575 watt fixtures is pushing it.
 
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TJCornish

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Joined
Mar 27, 2012
Location
St. Paul, MN
Beware of the ratings on 4 channel "shoebox" dimmers! Some say 600 watts per channel, others say 10 amps per channel. People see the 10 amps and think, oh cool, 1000 watts! Well, the 10 amp fuse is more there for fire protection. The Triacs used in most all of these packs is good for about 600 watts. Anything more and you run the chance of popping them. In addition, many packs are equipped with a 14/3 power cable with a 15 amp plug. That further limits the full pack load to about 1400 watts. (1800 for short duration.) In other words, even running three 575 watt fixtures is pushing it.
Your advice is good generally, however the OP's dimmers (Leprecon ULD360) are several cuts above the typical cheapo pack, having 25A SSRs and other nice features. They are very high-quality. My leaning is misconfiguration as @seanandkate suggested.
 

Amiers

Renting to Corporate One Fixture at a Time.
Joined
May 28, 2009
Location
Phoenix, Az
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Well if that’s the case check this. But I doubt it.
 

JD

Well-Known Member
Joined
Jan 1, 2005
Location
North Wales PA
Your advice is good generally, however the OP's dimmers (Leprecon ULD360) are several cuts above the typical cheapo pack, having 25A SSRs and other nice features. They are very high-quality. My leaning is misconfiguration as @seanandkate suggested.
More directed to if a substitute pack is used (ex- #5.)
 

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