Section 5.8 Temperature Protection In Nema-Rated Enclosures - Spectrum Controls InView Series User Manual

5-18

Section 5.8 Temperature Protection in NEMA-Rated Enclosures

Model
2706-P42-SC,
2706-P44-SC
2706-P72-SC,
2706-P74-SC
2706-P92-SC,
2706-P94-SC
Model Enclosure
NEMA 4,
2706-P92C2-SC
2706-P94C2-SC
NEMA 4X
NOTE
User's Manual 0300277-02 Rev. C
InView Control and InView Control API
Some InView signs in NEMA-rated enclosures 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 shutdown 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 4, NEMA 4X
NEMA 12
Temperature at
which display is set
to 83% brightness
Above 50 °C
(122 °F)
When evaluating mounting locations for the sign, take into account the
effects of ambient temperature
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.
Dimming Point
55°C (131°F)
55°C (131°F)
55°C (131°F)
55°C (131°F)
55°C (131°F)
55°C (131°F)
Temperature at
which display is set
to 67% brightness
Above 55 °C
(131 °F)
Auto-Shutdown On
70°C (158°F)
70°C (158°F)
70°C (158°F)
70°C (158°F)
70°C (158°F)
75°C (167°F)
Temperature at Temperature at
which display is set which display is
to 50% brightness shut down
Above 60 °C 70 °C
(140 °F) (158 °F)