Transformer turning on and off

[galighting]

Why would a transformer turn on and off? It is a 600 Watt with 30 - 20 watt fixtures. the manufacturer states that the transformer may be loaded 100 percent, so I'm not sure why this is happening. Just replaced the photo cell, so I know that is not the problem.

Any advice? Thanks !!!

[sitelights]

The post "the bullet proof transformer" in this forum (search "thermal) touches on this topic. It may be that your transformer has internal auto-reset thermal breakers that trip when overheated and reset when they cool. This type of thermal overload protection is merely a bi-metal strip that makes or breaks contact to the primary. Overheating is most commonly a dead short somewhere on the secondary lines i.e. the two conductors are making contact.

[Lightguy]

Is the photo cell wired backwards ?
Constant On and off switching indicates that or you have a light shining on it.

David Knapp
www.ArtisanOutdoorLighting.com