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Echoflex Installation Guide
Light Sensor
Dimming Light Sensor Operation
When the DIP switch 1 is set to Dimming operation, the Light Sensor executes
space raise and space lower commands until it measures the target amount of
light or until it reaches the extents of the artificial lighting control.
Press the "Record Target" button to record the amount of current light (lux)
the Light Sensor will try to maintain. It will raise or lower light levels 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
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Target - (Target x Deadband%) / 100.
The high measured light threshold is
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Target + (Target x Deadband%) / 100.
To ensure a smooth transition, the Dimming operation does not
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exceed a fade rate greater than one second per percent dimmed.
Switched Photo Sensor Operation
When DIP switch 1 is set to Switched operation, the Light Sensor performs
threshold based activation of both a dark and a bright condition, which are
determined by the lux threshold settings. Lighting actions occur after
measurements have been maintained for the configured delay time.
By default, the dark action activates Preset 1 in the device's space, and
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the bright action executes the space "Off" command.
When used in a space with manual wall station controls, the dark
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action cannot be allowed anytime the space is in the "Off" state. Also
when used in the same space with Occupancy/Vacancy sensors, the
dark action is only allowed when there is occupancy.
Even in Automatic-On operation (no Inspire or Preset station manual
•
controls were detected), the Light Sensor is prohibited from turning on
lights after the space off command has been given by another device.
However, if the sensor itself issues the "Off" command (due to bright
conditions), it will turn on lighting if conditions become too dark .
Light Sensor
Page 12 of 12
Echoflex
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