AB Quality 2706-P4 Series Installation Instructions Manual page 19

18 InView Marquee Message Display
Temperature Protection in
NEMA-Rated Enclosures
Table B
Model
2706-P42, 2706-P44
2706-P43
2706-P72, 2706-P74
Publication 2706-IN006E-EN-P
InView P42, P43, P44, P72, and P74 signs have automatic temperature
controls that help to protect the sign from damage when the internal
temperature of the sign is too hot to continue normal operation.
• If the internal temperature of the sign reaches a pre-determined
"dimming point", the LED output from the sign is forced into a
50 percent reduced power mode, effectively dimming the
brightness of LED output by about 50 percent.
• If the internal temperature of the sign continues to increase,
another sensing circuit will execute an automatic shut down to
protect the sign from damage. The LED output from the sign is
turned off.
• The dimming and shutdown points are listed in the table below.
Once the temperature drops below the auto-shutdown
threshold, the LED output is turned on at the dimming level.
Once the temperature drops below the dimming threshold,
auto-dimming is disabled and the LED brightness is back to 100
percent.
Enclosure
NEMA 12
NEMA 12
NEMA 4, NEMA 4x
TIP
Dimming Point
55°C (131°F)
55°C (131°F)
55°C (131°F)
Take into account the effects of ambient temperature
when evaluating mounting locations for the sign.
You should always maintain recommended clearance
distances around the sign and avoid poorly
ventilated mounting locations that could be subject
to radiation, convection, conduction or other thermal
transfer effects.
Auto-Shutdown On
70°C (158°F)
70°C (158°F)
70°C (158°F)