[Greg M]

I have a 3-lamp, fluorescent fixture. The fixture has a single-lamp ballast, a double-lamp ballast and an emergency battery pack which lights the two, outside lamps in case of a power failure. With normal power, only the middle lamp will come on. When the 'test' button ( simulating a power outage) is pushed, the middle light goes out and the two outside lamps come on. This tells me the two outside lamps are hooked to the battery pack and that the battery pack is good. I have meticulously copied the wiring to this fixture from an identical fixture which works properly ( all three lamps are on during normal power and during a power outage, the middle lamp goes out and the two outside stay on) and have replaced the double-lamp ballast yet, the two outside lamps will not come on during normal power. Since the middle lamp is on during normal power and the two outside lamps come on when a power outage is simulated, the tombstones are obviously good. Any suggestions on why all three lamps will not come on during normal power and/or what else I can test or try? Thanks.

 

[Jim Port]

Sounds like the wiring is switched at the ballast. Do the other fixtures keep two tubes lit on emergency or just the center tube?

 

[joed]

Sounds like the emergency power swap control board may have an issue. It is obviously getting power to sense the outage. It is not passing that power to the ballast under normal power mode. Perhaps a bad relay on the control board?