Legrand CSU Series 32 kHz - Manual (Page 6)

Sensitivity and Time Delay adjustments are both made under the sensor’s front cover. Insert a
small flat-blade screwdriver in the slot of the front cover to open it.
The Sensitivity Adjustment Trimpot (labeled “S”) increases or decreases the occupancy
detection sensitivity.
The Time Delay is the length of time the lights stay on after no motion has been detected. It is set
with DIP Switches #1–5.
The red LED flashes each time the unit senses motion. It remains on when the sensor is in
Override mode.
Override—setting DIP switch #6 to “ON” will bypass (override) all the sensor’s occupancy control
functions. Lights can still be manually on/off controlled with a light switch.
Output Disable—setting all DIP switches to “OFF” will disable the Control Output (see Wiring
Directions). This can be used for troubleshooting sensor and power pack problems.
Adjustment:
• Furnishings, carpeting or office structures can affect ultrasonic sensitivity and should be
installed before adjustment, if possible.
• Ultrasonic sensors should have their sensitivity adjusted when interference from air movement
is at its maximum. Override the the HVAC and VAV systems to the maximum “ON” position.
1. Set the Sensitivity adjustment trimpot to about mid-range.
2. Set the Time Delay to 15 seconds for this testing procedure.
3. Move out of the controlled area—the lights will turn off in about 15 seconds from the last flash
of the red LED. If the LED continues to flash, the sensor is detecting some kind of movement.
Turn the Sensitivity adjustment trimpot down slightly (counterclockwise) and repeat this step
until the LED does not flash and the lights turn off.
4. Now walk into the controlled area. If the lights don’t turn on, increase the Sensitivity slightly
(clockwise) and try again. Repeat this procedure until the lights come on when entering the
controlled area.
5. Also, if the lights turn off while the room is occupied, it may be necessary to increase the
Sensitivity slightly.
6. Set the desired Time Delay—16 minutes works well for normal applications.
* Sensitivity = 50% / Time Delay = 16 minutes.
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