ETC Echo Light Sensor - Manual (Page 11)

E T C I n s t a l l a t i o n G u i d e
Echo™ Light Sensor
Page 11 of 12 Echo Light Sensor Installation Guide
Attach Sensor
Attach the sensor to the mounting plate by aligning the tabs on the sensor with
the slots on the mounting plate, then twist clockwise until the two are locked
into place.
Sensor Operation
Dimming Photo Sensor Operation
When the dip switch 1 is set to Dimming operation, the sensor executes space
raise and space lower commands until the sensor measures the target amount
of light, or until it reaches the extents of the artificial lighting control.
• The “Record Target” button records the amount of light (lux) the sensor will
try to maintain. The sensor raises or lowers light after the measured light is
respectively above or below the target thresholds for the configured delay
time (calculated as target +/- the amount of percent deadband sensitivity)
until the target amount of light is achieved or it reaches the extents of the
raise/lower commands.
• Example: Assume the recorded target has been set to 1500 lux, and
deadband sensitivity is set to 20%. When measurements drop below 1200
lux, the sensor will attempt to raise lighting. When measurements rise
above 1800 lux, the sensor will attempt to lower lighting.
• The low measured light threshold is Target - (Target x Deadband%) /
100.
• The high measured light threshold is Target + (Target x Deadband%) /
100.
• To ensure a smooth transition, the Dimming operation does not exceed a
fade rate greater than one second per percent dimmed.
Auxiliary
button
Record
target
button
Record Target
The “Record Target” button takes a snapshot of
the current light (lux) settings, which determines
the amount of light the sensor should maintain.
Step 1: Push the “Record Target” button.
A 10 second timer begins and a green
LED illuminates, indicating the record
process.
• Once the 10 second timer finishes, the
current measured lux value records as
the target (threshold) value.
• The LED will blink twice when the
target (threshold) value is successfully
recorded.
• Pressing “Record Target” again during
the 10 second timer will cancel the
record process.