Analog Light Sensor - Novar Savvy Service Manual

Analog Light Sensor

DOC. #TD-0240 11/30/06
The Analog Light Sensor (ALS-300 and ALS-1.5K; Figure 3) is mounted on the
Outdoor Sensor Assembly on the roof, facing north.
Figure 3. Analog Light Sensor
It uses a shielded, two-wire cable to:
Receive 24-VDC power from the Savvy or an Input/Output Module (IOM).
Send a 4- to 20-milliamp signal proportional to the light level back to the input
terminal strip.
NOTE! When the sensor is wired, polarity must be observed.
The Savvy translates that signal into a 0–300 or 0–1500 footcandle reading. The
sensor is permanently calibrated at the factory.
The Analog Light Sensor Faults Troubleshooting Chart included in this
document can be used to troubleshoot ALS faults.
Savvy Service Manual
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