Sensor Adjustment - LEGRAND Wattstopper DT-305 Manual

360 dual technology • low voltage occupancy sensor (version 3) with manual on feature

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Table of Contents

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This unit is pre-set for basic operation as described in this guide. Adjustment is optional.

The sensors are factory preset to allow for quick installation in most

applications. Verification of proper wiring or coverage, or customizing the

sensor's settings can be done using the following procedures. To make

adjustments, open the Front Cover by pulling on the cover tab.

There is a 30 second warm-up period when power is first applied.

Before making adjustments, make sure the office furniture is installed,

lighting circuits are turned on, and the HVAC systems are in the overridden/

on position. VAV systems should be set to their highest airflow. Set the Logic

Configuration and Time Delay to the desired settings. See the DIP Switch

configuration chart.

To Test Occupancy Sensors

1. Ensure the Time Delay is set for Test Mode* using the "Test Mode/20

minutes" setting. (DIP switches 1, 2, & 3 are OFF).

2. Ensure that the Ultrasonic Sensitivity trimpot is set to about 70%, clockwise.

3. Remain still. The red and green LEDs should not flash. The lights should turn off after 5 seconds. (If not, see "Troubleshooting.")

4. Move around within the coverage area. The lights should come on. Adjust the Ultrasonic Sensitivity as necessary to provide the

desired coverage (Green LED indicates activation from the ultrasonic sensor).

When testing and adjustment is complete, reset DIP Switches to the desired settings, and replace the cover on the sensor.

* Test Mode is a temporary state that starts when you first set the sensor's DIP switches for the "Test Mode/20 minutes" (switches 1,

2, 3, OFF). If you need to invoke the Test Mode and the DIP switches are already set for Test Mode/20 minutes, toggle DIP switch 1

ON then back to the OFF position. This provides a 10 minute test period. During the test period, the Time Delay is only 5 seconds.

The Manual ON function is facilitated by installing a momentary switch such as Wattstopper LVS-1 Momentary Toggle Switch, or RS2-3

Low Voltage Momentary Switch. The switch connects to the sensor's Manual (Man.) Switch and +24V terminals as shown in the wiring

diagram. Each time the switch is pressed, the load changes state. The sensor's operation as related to the manually operated switch is

determined by DIP switch settings for Occupancy Logic.

Manual Mode (Trigger Option 6 or 7): In this mode, the switch is required to turn on the load. The sensor keeps the load ON, based on

occupant activity. After the time delay ends, if there is no movement detected within the 30 second re-trigger period, the load turns OFF

and the manual switch must be used to turn ON the load.

Automatic Mode (any Trigger Option except 6 or 7): These options use occupancy triggers as well as switch activation to turn the load

ON. A manual switch provides the following additional functionality:

1. The load can be turned ON using the manual switch and it stays on according to the occupancy logic setting. The time delay

operates as programmed. When the load turns OFF due to lack of occupancy detection, it can be turned ON again by occupancy

detection or the switch.

2. Activating the manual switch while the load is ON turns the load OFF.

• When the load is turned OFF manually, as long as the sensor continues to detect occupancy the load stays OFF. The length of

the time delay after the last occupancy detection, the lights stay off and the sensor reverts to the automatic-on mode.

• When the load is turned OFF manually, pressing the switch again turns the load ON and the sensor reverts to the automatic-on

mode.

• Once returning to automatic-on mode, either the switch or occupancy detection can turn the load ON.