Specifications

FTB 312-4 Revision 4 – 1-8-2008 3
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Indication
White Alarm Combination of Day Intensity and Photocell Errors.
Red Alarm Combination of Night Intensity and Photocell Errors.
Day Intensity Error Incorrect day intensity.
Night Intensity Error Incorrect night intensity.
Photocell Error Photocell alarm. The PEC failed to transition within 19 hours.
Day Mode Day mode operation.
Night Mode Night mode operation.
Photocell
The photocell changes resistance as ambient light changes from day to night or from night to
day. The Timing and Trigger Board (PCB1) in the master power converter then converts the
changes into the necessary circuit operation to flash the lights at the appropriate intensity for
day or night operation.